ACS Applied Nano Materials最新文献

{"title":"Analysis of Impact of C60 Fullerenes on Room-Temperature Seebeck Coefficient and Magnetotransport Properties of Flexible Thermoelectric Bi2Se3-C60-MWCNT Heterostructures","authors":"Jana Andzane,&nbsp;Elmars Spalva,&nbsp;Urol K. Makhmanov,&nbsp;Kiryl Niherysh,&nbsp;Lasma Bugovecka and Donats Erts*,&nbsp;","doi":"10.1021/acsanm.4c0672110.1021/acsanm.4c06721","DOIUrl":"https://doi.org/10.1021/acsanm.4c06721https://doi.org/10.1021/acsanm.4c06721","url":null,"abstract":"<p >Room-temperature thermoelectric properties of heterostructures prepared by direct physical vapor deposition of Bi₂Se₃ nanostructures on carbon fullerenes (C60)-multiwalled carbon nanotubes (MWCNT) substrates were studied in relation to the C60/MWCNT wt % ratio in the substrate and compared with the properties of similar heterostructures fabricated using bare untreated p-type MWCNTs and nitrogen-doped n-type MWCNTs (<i>n</i>MWCNTs). It is found that Bi₂Se₃-C60-MWCNT heterostructures exhibit n-type conductance when the total wt % of the C60-MWCNT component does not exceed 10 wt %, and at optimal C60/MWCNT ratios the maximal power factor of ∼58 μW/mK² is reached, which exceeds previously reported maximal power factor values exhibited by Bi₂Se₃-MWCNT and Bi₂Se₃-<i>n</i>MWCNT heterostructures, as well as by C60-based hybrid thermoelectric materials, by factors of ∼11, ∼4, and ∼2, respectively. This effect was attributed to the cluster-like growth mechanism of Bi₂Se₃ on C60-MWCNT substrates different from that on bare MWCNTs, which was supported by the magnetoresistance studies of the Bi₂Se₃-C60-MWCNT heterostructures in the 2–300 K temperature range, and to the charge transfer between the Bi₂Se₃ and C60 molecules, resulting in the formation of a Bi₂Se₃-dominated heterostructure with enhanced Seebeck coefficient, reaching ∼−110 to −150 μV/K and electrical resistivity not exceeding 1 mΩ·m for optimal C60/MWCNT ratios, which is similar to or lower than that of Bi₂Se₃-MWCNT and Bi₂Se₃-<i>n</i>MWCNT heterostructures. In addition, bending tests performed for Bi₂Se₃-C60-MWCNT heterostructures with the best power factor showed that these structures are stable during 100 consecutive bending cycles down to a 4 mm radius. This work opens the path for significant improvement of thermoelectrical properties of topological insulator–carbon allotrope heterostructures by tuning their charge transport mechanism using different types and concentrations of carbon allotropes and for their application in flexible thermoelectrics.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7563–7573 7563–7573"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"n-Type Metal-Oxide-Semiconductor Field-Effect Transistor Based on 100-Period Fully Strained SiGe/Si Nanostructures with Superlattice Epitaxy for Three-Dimensional Dynamic Random-Access Memory","authors":"Ying Zhang,&nbsp;Xiangsheng Wang,&nbsp;Shujuan Mao,&nbsp;Jing Liang,&nbsp;Mingli Liu,&nbsp;Xinhe Wang,&nbsp;Han Wang,&nbsp;Wenhao Zhang,&nbsp;Hailing Wang,&nbsp;Yanpeng Song,&nbsp;Xiaomeng Liu,&nbsp;Xinyou Liu,&nbsp;Zhenzhen Kong,&nbsp;Zhaoqiang Bai,&nbsp;Guilei Wang* and Chao Zhao*,&nbsp;","doi":"10.1021/acsanm.5c0042610.1021/acsanm.5c00426","DOIUrl":"https://doi.org/10.1021/acsanm.5c00426https://doi.org/10.1021/acsanm.5c00426","url":null,"abstract":"<p >Vertically stacked 3D dynamic random-access memory (DRAM) with horizontal cells has emerged as a promising solution for next-generation high-density memory. In order to meet the next node requirement, the stacked period of a specific SiGe/Si superlattice (SL) needs to exceed more than 64. However, achieving ultrahigh-period SiGe/Si SLs with uniform strain and low defects remains a critical challenge. Here, we demonstrate the epitaxial growth of fully strained 100-period Si/Si_0.8Ge_0.2 (43/8 nm) SLs with a total thickness of 5 μm. The SLs exhibit exceptional tier-to-tier uniformity (σ_thickness ∼ 0.33, σ_Ge% ∼ 0.66), excellent crystallinity, sharp SiGe/Si interface (&lt;3.3 nm), smooth surface (roughness &lt;0.1 nm), and low threading dislocation density (&lt;10⁷/cm²). To efficiently evaluate the electrical performance of stacked SLs, we propose an approach using planar n-MOSFETs fabricated on the top Si layer. Remarkably, these devices show consistent electrical properties across 5–100 periods, confirming the uniformity of electrical performance of individual Si layers across the entire stack, even for 100-period SLs. This work provides a scalable pathway toward high-performance 3D DRAM with significantly enhanced storage density.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7653–7661 7653–7661"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MXene-Derived Potassium-Preintercalated Bilayered Vanadium Oxide Nanostructures for Cathodes in Nonaqueous K-Ion Batteries","authors":"Timofey Averianov,&nbsp;Xinle Zhang,&nbsp;Ryan Andris,&nbsp;Daniel Olds,&nbsp;Michael J. Zachman and Ekaterina Pomerantseva*,&nbsp;","doi":"10.1021/acsanm.5c0017510.1021/acsanm.5c00175","DOIUrl":"https://doi.org/10.1021/acsanm.5c00175https://doi.org/10.1021/acsanm.5c00175","url":null,"abstract":"<p >Bilayered vanadium oxides (BVOs) are promising cathode materials for beyond-Li-ion batteries due to their tunable chemistries and high theoretical capacities. However, the large size of beyond-Li⁺ ions limits electrochemical cycling and rate capability of BVO electrodes. Recent reports of MXene-derived BVOs with nanoscale flower-like morphology have shown improved electrochemical stability at high rates up to 5C in nonaqueous lithium-ion batteries. Here, we report how morphological stabilization can lead to improved rate capability in potassium-ion batteries (PIBs) through the synthesis and electrochemical characterization of MXene-derived K-preintercalated BVOs (MD-KVOs), which were derived from two V₂CT_<i>x</i> precursor materials prepared using two different etching protocols. We show that the etching conditions affect the surface chemistry of the MXene, which plays a role in the MXene-to-oxide transformation process. MXene derived from a milder etchant transformed into a nanoflower MD-KVO with two-dimensional (2D) nanosheet petals (KVO-DMAE) while a more aggressive etchant produced a MXene that transformed into a MD-KVO with one-dimensional (1D) nanorod morphology (KVO-CMAE). Electrochemical cycling of the produced MD-KVOs after drying at 200 °C under vacuum (KVO-DMAE-200 and KVO-CMAE-200) in PIBs showed that electrochemical stability of MD-KVO at high rates improved through the morphological stabilization of 2D particles combined with the control of interlayer water and K⁺ ion content. Structure refinement of KVO-DMAE-200 further corroborates the behavior observed during K⁺ ion cycling, connecting structural and compositional characteristics to the improved rate capability. This work demonstrates how proper synthetic methodology can cause downstream effects in the control of structure, chemical composition, and morphology of nanostructured layered oxide materials, which is necessary for development of future materials for beyond-Li-ion battery technologies.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7582–7595 7582–7595"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsanm.5c00175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic Field-Responsive Nanodrug to Regulate TRPV1 Pain Receptor","authors":"Athena B. Santi,&nbsp;Nicolas Muzzio,&nbsp;Amanda Gomez and Gabriela Romero*,&nbsp;","doi":"10.1021/acsanm.5c0181210.1021/acsanm.5c01812","DOIUrl":"https://doi.org/10.1021/acsanm.5c01812https://doi.org/10.1021/acsanm.5c01812","url":null,"abstract":"<p >Neuropathic pain is a chronic condition that often requires long-term management, with opioids frequently being the primary option for severe pain relief. Capsaicin, a natural analgesic, holds promise for chronic pain management but is limited by its hydrophobicity, low tissue affinity, and short half-life. In this study, we developed a magnetic field-responsive nanodrug for the on-demand delivery of capsaicin, overcoming these limitations. We utilize iron oxide magnetic nanoparticles (MNPs) functionally coated with thermoresponsive poly(oligo (ethylene glycol) methyl ether methacrylate) (POEGMA). POEGMA nanocoatings on MNPs serve as capsaicin reservoirs. Upon alternating magnetic field (AMFs) exposure, MNPs dissipate heat locally, which triggers the thermodynamic response of their POEGMA nanocoating for capsaicin release. We studied the passive and AMFs-controlled release of capsaicin from MNPs. Then, we investigated the nanodrug for regulating the pain receptor TRPV1, endogenously expressed in primary rat hippocampal neurons, using calcium ion influx as an ion channel activity indicator. Finally, we assessed the biological impact of the nanodrug through cell viability and reactive oxygen species production. We showed that AMFs-induced release of one dose of capsaicin enhances TRPV1 receptors in more than 75% of hippocampal neurons, which would translate to an increased pain sensitivity. However, tonic capsaicin treatment (more than 3 doses of AMFs-induced release) desensitizes TRPV1 in more than 90% of neurons, which would result in analgesic effects. Importantly, the nanotherapy has no detrimental effects on neuronal health. The nanodrug developed here offers a promising mechanism-driven alternative for chronic pain management by enabling wireless and on-demand control of pain receptors.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7899–7910 7899–7910"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Flower-Shaped Particles Composed of Phenylboronic Acid-Functionalized Microporous Organic Network Nanopetals for Efficient Enrichment of Salvianolic Acid B","authors":"Qian-Qian Xu,&nbsp;Ke-Xin Zheng,&nbsp;Yuan-Yuan Cui* and Cheng-Xiong Yang*,&nbsp;","doi":"10.1021/acsanm.4c0727210.1021/acsanm.4c07272","DOIUrl":"https://doi.org/10.1021/acsanm.4c07272https://doi.org/10.1021/acsanm.4c07272","url":null,"abstract":"<p >Selective enrichment and isolation of polar phenolic acid compounds from the complex matrix of traditional Chinese medicine <i>Salvia miltiorrhiza</i> (Danshen) is challenging yet highly desirable due to their excellent pharmacological activities on cardiovascular and cerebrovascular systems. However, owing to their polar and ionic characteristics, trace levels of phenolic acid compounds, and the complexity of traditional Chinese medicine matrices, the selectivity and adsorption capacity of conventional separation media remain limited. Therefore, the rational design of efficient and selective extractants is crucial. In this study, a phenylboronic acid-functionalized microporous organic network (<i>p</i>-PBA-MON), with nanoscale porosity (1.2 nm) and a high surface area (437.6 m² g^–1), was synthesized and employed as an adsorbent for the selective and efficient enrichment of the phenolic acid compound salvianolic acid B (SAB) from <i>Salvia miltiorrhiza</i>. A monomer containing phenylboronic acid groups was chosen to construct <i>p</i>-PBA-MON, forming specific five- or six-membered cyclic esters with <i>cis</i>-diol groups in SAB and providing synergistic π–π and hydrogen bonding sites. This results in the selective adsorption of SAB with ultrafast adsorption kinetics (&lt;20 min, <i>C</i>₀ = 50 mg L^–1) and high adsorption capacity (217.4 mg g^–1). The synthesized <i>p</i>-PBA-MON tolerates the influences of ionic strength and humic acid and can be reused at least five times without a decrease in adsorption capacity. This study introduces an efficient adsorbent for the selective enrichment and separation of polar SAB from complex traditional Chinese medicine samples. This advancement could significantly extend the application of MON in the extraction and purification of active substances from Chinese medicine and promote its development in the separation of complex samples.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7482–7490 7482–7490"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manipulating Fano Resonance Using Notch Nanogap Nanoantenna for SERS Detection","authors":"Dengchao Huang,&nbsp;Qingxiu Ding,&nbsp;Huaizhi Guan,&nbsp;Wei Li,&nbsp;Rulin Guan,&nbsp;Cheng Wang,&nbsp;Yaqiong Li,&nbsp;Binzi Xu,&nbsp;Wengen Gao* and Kang Yang*,&nbsp;","doi":"10.1021/acsanm.4c0722710.1021/acsanm.4c07227","DOIUrl":"https://doi.org/10.1021/acsanm.4c07227https://doi.org/10.1021/acsanm.4c07227","url":null,"abstract":"<p >Noble metal nanostructures have attracted substantial interest due to their unique optical properties, particularly their localized surface plasmon resonance (LSPR), which enables significant near-field electromagnetic enhancements. Among these, bowtie nanoantennas (BNAs) stand out for their strong plasmonic coupling at nanogap regions, making them highly effective in applications such as surface-enhanced Raman scattering (SERS). However, the limited hotspot area and potential scattering losses at peak enhancement wavelengths remain challenges for practical applications. To address these limitations, we designed and investigated a notch metal–insulator–metal bowtie nanoantenna (MIM-BNA) structure. Ge materials were horizontally integrated into conventional Ag-BNA nanostructures, and notched silver nanorods were strategically placed in the nanogap region to disrupt the geometric symmetry, thereby inducing Fano resonance. This approach successfully coupled bright (dipole mode of the nanorod array) and dark plasmonic modes (antisymmetric mode of the MIM-BNA), enhancing the electric field at the Fano dip wavelength. Further analysis explored the effects of material composition, stacking configurations, and nanorod arrays on near-field enhancement. Our findings demonstrate that the MIM-BNA structure significantly improves the near-field effect, provides more flexible adjustment of the operating wavelength within the visible and near-infrared (NIR) light spectrum, and expands the hotspot area compared to traditional BNAs, providing a promising platform for advanced SERS applications and other plasmonic technologies.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7552–7562 7552–7562"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multifunctional Liquid Metal-Based Nanocomposite Hydrogel with High Conductivity, Antibacterial and Adhesive Properties for Wearable Electronics","authors":"Fang Liu,&nbsp;Zehua Chen,&nbsp;Zidan Zhang,&nbsp;Li Tang,&nbsp;Jianxin Tang* and Bailin Dai*,&nbsp;","doi":"10.1021/acsanm.5c0033610.1021/acsanm.5c00336","DOIUrl":"https://doi.org/10.1021/acsanm.5c00336https://doi.org/10.1021/acsanm.5c00336","url":null,"abstract":"<p >The emergence of eutectic gallium–indium (EGaIn) liquid metal (LM) alloys as a soft multifunctional nanofiller presents an opportunity for the fabrication of hydrogel-based strain sensors with advanced multifunctional properties. However, developing a facile and efficient approach to synthesize nanocomposite conductive hydrogels that exhibit excellent stretchability, conductivity, self-adhesion, and antibacterial properties remains a significant challenge. In this study, we introduce a semi-interpenetrating network design strategy to synthesize a high-performance nanocomposite hydrogel [liquid metal/silver nanowires/sodium lignosulfonate/polyacrylamide] [LM/AgNWs/SL/pAM] (LASM). This hydrogel consists of a single polyacrylamide (pAM) network combined with a semi-interpenetrating network formed by silver nanowires (AgNWs) and LM nanoparticles. The semi-interpenetrating network is primarily cross-linked through hydrogen bonds, electrostatic interactions, and metal coordination. The resulting conductive hydrogels demonstrate superior stretchable properties (tensile stress: 120.28 kPa; tensile strain: 373.15%), impressive conductivity (0.64 S/m), high antifatigue performance, self-adhesive characteristics (Ti: 25.40 kPa; Al: 20.66 kPa), and notable antibacterial activity, all achieved through the construction of a hybrid chemical and physical cross-linking network. Leveraging these attributes, the nanocomposite hydrogel was assembled into a flexible sensor capable of distinguishing an extensive range of human movements, from large scale motions to subtle joint bending with remarkable stability and sensitivity. Furthermore, the LASM strain sensor can function as an adaptable writing keyboard that accurately recognizes English letters (“a”, “p”, “e”, “L,” and “HUT”) in real time when written on its surface. This multifunctional 3D nanocomposite conductive hydrogel holds great potential for applications in wearable electronics.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7616–7629 7616–7629"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alignment Relation between a Nematic Liquid Crystal and ReS2 Nanosheets: Implications for Anisotropic Optoelectronic Applications","authors":"Sujin Bang,&nbsp;Jun-Yong Lee,&nbsp;Jae Hoon Lee,&nbsp;Jeong-Seon Yu and Jong-Hyun Kim*,&nbsp;","doi":"10.1021/acsanm.5c0153810.1021/acsanm.5c01538","DOIUrl":"https://doi.org/10.1021/acsanm.5c01538https://doi.org/10.1021/acsanm.5c01538","url":null,"abstract":"<p >Rhenium disulfide (ReS₂), a two-dimensional (2D) semiconductor, exhibits unique anisotropic properties rarely found in other 2D materials. This study investigates the alignment characteristics of nematic liquid crystals on ReS₂ nanosheet using optical texture analysis, transmission measurements, and Raman scattering techniques. For the <i></i><math><mover><mrow><mi>b</mi><mspace></mspace></mrow><mo>→</mo></mover><mtext>and</mtext><mspace></mspace><mover><mrow><mspace></mspace><mi>c</mi></mrow><mo>→</mo></mover></math>, crystal basis vectors of ReS₂, the director (<i></i><math><msub><mover><mi>n</mi><mo>^</mo></mover><mn>0</mn></msub></math>) aligned along the easy axis satisfies equations, <i></i><math><msub><mover><mi>n</mi><mo>^</mo></mover><mn>0</mn></msub><mo>·</mo><mrow><mo>(</mo><mover><mi>c</mi><mo>→</mo></mover><mo>×</mo><mover><mi>b</mi><mo>→</mo></mover><mo>)</mo></mrow><mo>&gt;</mo><mn>0</mn></math> and <i></i><math><msub><mover><mi>n</mi><mo>^</mo></mover><mn>0</mn></msub><mo>·</mo><mover><mi>b</mi><mo>→</mo></mover><mo>=</mo><mrow><mo>|</mo><mover><mi>b</mi><mo>→</mo></mover><mo>|</mo></mrow><mi>cos</mi><mrow><mo>(</mo><mi>θ</mi><mo>)</mo></mrow></math> &gt; 0 with θ = 15°. Both polar and azimuthal anchoring strengths were found to be very weak, with extrapolation lengths on the order of several micrometers. Additionally, the orientation of the ReS₂ nanosheets suspended in the nematic liquid crystal is effectively controlled through electric field application and director manipulation. The ability to control the orientation of ReS₂ nanosheets through several methods suggests that the anisotropic properties of ReS₂ can be effectively tuned to different values for switching applications. This capability opens up possibilities for leveraging the unique directional characteristics of ReS₂ in devices that require precise orientation-dependent control.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7840–7847 7840–7847"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nanocomposites of Titania/Reduced Graphene Oxide: Flexible Humidity Sensors Tuned via Photocatalytic Reduction","authors":"Sophia C. Bittinger*,&nbsp;Jana Struck,&nbsp;Finn Dobschall,&nbsp;Sophie Benthien,&nbsp;Hauke Hartmann,&nbsp;Hendrik Schlicke,&nbsp;Mona Kohantorabi,&nbsp;Heshmat Noei and Tobias Vossmeyer*,&nbsp;","doi":"10.1021/acsanm.4c0652410.1021/acsanm.4c06524","DOIUrl":"https://doi.org/10.1021/acsanm.4c06524https://doi.org/10.1021/acsanm.4c06524","url":null,"abstract":"<p >In this study, we demonstrate the tunability of hybrid graphene oxide/reduced graphene oxide/titania nanocrystal (GO/rGO/TNC) films for resistive humidity sensing through photocatalytic reduction. Using a layer-by-layer spin-coating (LbL-SC) technique, we fabricate GO/TNC nanofilms with titania nanorods (TNRs) or nanoplates (TNPs) on various substrates, achieving high uniformity and precise control over the film thickness (15–150 nm). We investigate the evolution of the electrical, optical, and structural properties of these films, modulated by the photocatalytic activity of TNCs under UV exposure (254 nm) while varying the illumination time, TNC type, and film thickness. The inclusion of TNCs enhances the films’ conductivity by several orders of magnitude compared to pure GO films under UV illumination and enables precise adjustment of the GO/rGO and (GO/rGO)/TNC ratios. This approach is used for tuning the sensitivity, response time, and response polarity of (GO/rGO)/TNC resistors on flexible substrates to changes in relative humidity (RH). TNP-based films demonstrate superior performance, achieving sensitivities of up to 2.2 and response times as short as 1 s over a broad range of RH levels (∼35 to 85% and ∼1 to 80%). Depending on the composition and RH level, the sensors exhibit both positive and negative resistive responses to increasing humidity. Gravimetric analyses show that films with varying GO/rGO ratios exhibit the same change in water mass uptake, indicating that the differences in resistive behavior are driven by UV-induced alterations in their chemical and electrical properties. Finally, we propose the use of these sensors to detect body-related humidity fluctuations, demonstrating their suitability for wearable electronics. Our results highlight the potential applicability of (GO/rGO)/TNC nanocomposites as highly customizable humidity sensors.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7428–7439 7428–7439"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsanm.4c06524","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large-Scale Monolayer VS2 as Catalyst for Hydrogen Evolution Reaction","authors":"Zhihua Cheng,&nbsp;Chaoyu Chen,&nbsp;Zhiqiang Li,&nbsp;Hualong Tao,&nbsp;Qi Wang,&nbsp;Zhiguang Sun,&nbsp;Kai Zhao,&nbsp;Yixuan Fu,&nbsp;Zheng Ling,&nbsp;Baoting Quan,&nbsp;Ying Wang,&nbsp;Zheng Wei*,&nbsp;Yongqing Cai*,&nbsp;Yao Liang* and Zhihua Zhang*,&nbsp;","doi":"10.1021/acsanm.5c0082210.1021/acsanm.5c00822","DOIUrl":"https://doi.org/10.1021/acsanm.5c00822https://doi.org/10.1021/acsanm.5c00822","url":null,"abstract":"<p >Two-dimensional (2D) layered transition metal dichalcogenides have garnered significant attention for their potential in advanced applications of electronics and energy conversion technologies. As a prototypical member of the 2D materials family, vanadium disulfide (VS₂) distinguishes itself through its great mechanical strength, tunable electronic characteristics, intriguing magnetic properties, and exceptional electrochemical performance. However, the synthesis of high-quality VS₂ films is severely hampered by its thermodynamic instability and the tendency to form polymorphs. In this work, we present clean and efficient low-pressure chemical vapor deposition for the growth of large-scale H-phase VS₂ monolayers on sapphire substrates. By regulating the ratio of precursors, controlling the growth temperature and optimizing the position of substrates, the production of polymorphs is effectively suppressed, resulting in improved quality of VS₂ films. Electrochemical measurements reveal that the VS₂ monolayers exhibit superior electrocatalytic performance for hydrogen evolution reaction compared to monolayer molybdenum disulfide (MoS₂). This work provides a significant advancement in the scalable production of monolayer VS₂ and its potential applications in clean energy technologies.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":"8 15","pages":"7770–7777 7770–7777"},"PeriodicalIF":5.3,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}