Nanoscale最新文献

{"title":"Corn Silk-derived Biomass Carbon Materials for Low-Frequency Microwave Absorption and Energy Storage","authors":"Juan Shi, Xi Zhang, Hongyu Zhu, Deren Li, Ya Nie, Bo Gao, Gang Xiang","doi":"10.1039/d4nr04960h","DOIUrl":"https://doi.org/10.1039/d4nr04960h","url":null,"abstract":"Biomass carbon (BC) materials derived from agricultural waste have shown great potential in microwave absorption (MA). However, current research mainly focuses on high-frequency (8-18 GHz) MA, and much less effort has been spent on low-frequency (2-8 GHz) MA and other important functionalities such as energy storage. Herein, corn silk rich in carbon source is utilized to prepare BC materials with uniform pores and large specific surface area through a straightforward chemical activation and carbonization process. Attributed to its optimized impedance matching, interfacial polarization and (N and O) heteroatoms-induced dipole polarization, the optimal sample exhibits superior low-frequency MA capability, including a strong reflection loss (RL) of –75 dB at 6.88 GHz, an effective absorption bandwidth (EAB, RL ≤ −10 dB) down to 2.8 GHz, and excellent radar cross-section reduction. Furthermore, it achieves a high initial discharge specific capacity of 1015.55 mA∙h g−1 and stable cycling performance at 0.5 A g−1 in lithium-ion batteries owing to its heteroatom-rich porous structure with large specific surface area. Our study offers a simple and low-cost way to fabricate high-performance multifunctional BC materials for low-frequency MA and lithium-ion energy storage.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"45 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Ni2P/NiMoOx nanocone electrocatalyst for efficient hydrogen evolution: tip-enhanced local electric field effect","authors":"Le Yu, Xia Chen, Shunda Cheng, Tingfeng Zhong, Ruifan Zhou, Zihua Deng, Li Li","doi":"10.1039/d4nr05221h","DOIUrl":"https://doi.org/10.1039/d4nr05221h","url":null,"abstract":"The sluggish kinetics of the hydrogen evolution reaction (HER) result in a high overpotential in alkaline solutions. A high-curvature metal oxide heterostructure can effectively boost the electrocatalytic HER by leveraging the tip-enhanced local electric field effect. Herein, Ni<small>₂</small>P/NiMoO<small>_<em>x</em></small> nanocones were synthesised on a nickel foam (NF) substrate by etching a metal–organic framework template. The Ni<small>₂</small>P/NiMoO<small>_<em>x</em></small> nanocones on the NF substrate served as an advanced electrocatalyst for the HER. Analysis using the finite element method indicated that the high-curvature tips of the Ni<small>₂</small>P/NiMoO<small>_<em>x</em></small> nanocones enhanced the local electric field, resulting in a higher concentration of hydrated K<small>⁺</small> ions (K(H<small>₂</small>O)<small>₆</small><small>⁺</small>), which facilitated water dissociation and accelerated the reaction kinetics. The tip-enhanced local electric field effect accelerates the mass transfer rate, and the heterostructure promotes charge transfer to activate the active center, thereby synergically enhancing the electrocatalytic reaction. The Ni<small>₂</small>P/NiMoO<small>_<em>x</em></small> nanocone electrocatalyst exhibited low overpotentials of 49, 137 and 274 mV at 10, 100 and 500 mA cm<small>⁻²</small>, respectively, under alkaline conditions for the HER. In addition, the electrocatalyst demonstrated excellent stability over 200 h at 300 mA cm<small>⁻²</small>. This study provides a promising approach for developing efficient electrocatalysts that facilitate the HER in alkaline solutions.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"12 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One-dimensional Lieb superlattices: from the discrete to the continuum limit","authors":"Dylan Jones, Marcin Mucha-Kruczynski, Adelina Ilie, Lucian Covaci","doi":"10.1039/d4nr03549f","DOIUrl":"https://doi.org/10.1039/d4nr03549f","url":null,"abstract":"The Lieb lattice is one of the simplest lattices that exhibits both linear Dirac-like and flat topological electronic bands. We propose to further tailor its electronic properties through periodic 1D electrostatic superlattices (SLs), which, in the long wavelength limit, were predicted to give rise to novel transport signatures, such as the omnidirectional super-Klein tunnelling (SKT). By numerically modelling the electronic structure at tight-binding level, we uncover the evolution of the Lieb SL band structure from the discrete all the way to the continuum regime and build a comprehensive picture of the Lieb lattice under 1D potentials. This approach allows us to also take into consideration the discrete lattice symmetry-breaking that occurs at the well/barrier interfaces created by the 1D SL, whose consequences cannot be explored using the previous low energy and long wavelength approaches. We find novel features in the band structure, among which are intersections of quadratic and flat bands, tilted Dirac cones, or series of additional anisotropic Dirac cones at energies where the SKT is predicted. Our results show that the universal SKT is absent when the lattice details are considered. Such features are relevant to experimental realizations of electronic transport in Lieb 1D SL realized in artificial lattices or in real material systems like 2D covalent organic/metal-organic frameworks and inorganic 2D solids.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"22 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controllable Synthesis of Environmentally Stable vdW Antiferromagnetic Oxyhalide CrOCl","authors":"Rounak Banerjee, Sai Uppala, Jan Kopaczek, Sakib Ahmed, Cheng Lun Wu, Mukesh Kumar, Kentaro Yumigeta, Umberto Celano, Seth Ariel Tongay","doi":"10.1039/d4nr03715d","DOIUrl":"https://doi.org/10.1039/d4nr03715d","url":null,"abstract":"Layered antiferromagnetic oxyhalides with high environmental stability have recently attracted significant interest owing to their applications in spintronics and quantum devices. These materials can sustain a host of interesting phenomena that arise from magnetic phase transitions associated with structural changes. Although bulk crystal synthesis for some members of this oxyhalide family has been previously reported, bottom-up approaches for scalable growth remain limited. In this work, we demonstrated the controllable synthesis of CrOCl on different substrates through atmospheric pressure chemical vapor deposition (APCVD) technique using CrCl3 and KMnO4 precursors. Our results demonstrate the successful gas-phase reaction and subsequent nucleation followed by island growth on different target substrates. Comprehensive structural and optical characterization reveals that the effect of temperature, growth time, and carrier gas flow rates ultimately dictate the overall phase and morphology of the crystal. Overall, our findings enhance the understanding of the bottom-up growth mechanisms for synthesizing layered oxyhalides and further expand the library of stable magnetic oxides.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"121 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Top-down curing to construct self-retaining and moisture-pumping double-layered dressing with enhanced antibacterial, hemostatic, and wound healing performances","authors":"Hao Yang, Yi Zhuang, Yulin Jiang, Huilun Xu, Zheng Liu, Yubao Li, Shuyu Zhang, Tao Guo, Lin Qi, Li Zhang","doi":"10.1039/d4nr04613g","DOIUrl":"https://doi.org/10.1039/d4nr04613g","url":null,"abstract":"Continuous microenvironment modulation is an ongoing challenge in wound dressing, which includes excessive exudate absorption, oxygen delivery, bacterial inhibition and angiogenesis. Herein, we developed an <em>in situ</em> construction strategy to fabricate a self-retaining double-layered wound dressing, where the top layer precursor was composed of Ca<small>²⁺</small>-containing polyvinyl butyral (PVB) solution dispersed with hydroxypropyl methylcellulose (HPMC) particles, and the bottom one consisted of sodium alginate (Alg) solution blended with Ag-doped mesoporous bioactive glass powders (Ag-MBG). When in use, both precursors were simultaneously squeezed out from the twin nozzles connected to the individual chambers of a twin-chambered syringe, whereby Ca<small>²⁺</small> in the top layer rapidly migrated downwards to crosslink Alg in the bottom layer, leading to the formation of an Alg/Ag-MBG (AA) functional hydrogel for filling an irregular wound. Meanwhile, with the rapid evaporation of low-boiling solvents, the top layer changed into a PVB/HPMC (PH) membrane covering the AA hydrogel and adhering to the surrounding healthy skin to fix the dressing. Practically, HPMC particles in the top layer acting as “micropumps” could drain the wound exudate out, while Ag-MBG in the bottom layer endowed the dressing with anti-bacterial, hemostatic, and pro-healing functions. The integrally constructed PH-AA dressing achieved over 99% bacterial elimination against both <em>E. coli</em> and <em>S. aureus</em>. Biological assessments indicated that the double-layered dressing possessed excellent biocompatibility and enhanced wound healing, demonstrating a wound closure rate of &gt;97% at day 15. This study provides a facile method to directly construct multi-layer dressings on wounds to meet various wound care requirements.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"22 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"All-in-one photothermal/catalytic flexible membrane for highly efficient desalination and organic pollutant degradation","authors":"Guanyu Zhao, Xuzhen Wang, Zihan Qiu, Runmeng Zhang, Qinqin Du, Zongbin Zhao, Jieshan Qiu","doi":"10.1039/d4nr04936e","DOIUrl":"https://doi.org/10.1039/d4nr04936e","url":null,"abstract":"Interfacial solar vapor generation (ISVG) accompanied by photocatalytic degradation holds immense potential to mitigate water scarcity and pollution. Distinct from the two detached functional components (photothermal agent and photocatalyst) in a conventional evaporator, in this study, an all-in-one photothermal/catalytic agent, nitrogen-containing honeycomb carbon nanosheets (NHC), was engineered for synergistic high-efficiency steam generation and photocatalysis functions. It was demonstrated that the superoxide radical generated on the surface of NHC conferred its catalytic activity to the photodegradation of organic pollutants under full solar spectrum irradiation. A proof-of-concept multifunctional evaporator (called NHC@PEI/MCE), consisting of NHC grafted with polyethyleneimine (PEI) and a hydrophilic mixed cellulose ester membrane (MCE), was fabricated to achieve both solar-driven desalination and organic pollutant degradation. Owing to its excellent light absorption capability (∼96%), reduced evaporation enthalpy (1358 J g<small>⁻¹</small>) and minimized heat loss (8.8%), the bi-layered evaporator performed a rapid water evaporation rate of 1.66 kg m<small>⁻²</small> h<small>⁻¹</small> under one standard sun illumination. Notably, the edge-preferential crystallization strategy enabled the bi-layered evaporator to maintain long-term stability for continuous water evaporation and salt harvesting over 80 h in a concentrated 3.5 wt% NaCl solution. The design of the all-in-one photothermal/catalytic agent NHC ensured the synchronous removal of organic pollutants. The removal rates of methylene blue and phenol were 99.82% and 79.6%, respectively. Additionally, the reduction rate of total organic carbon (TOC) in the actual coking wastewater was found to be 96.6%. The exceptional purification capabilities across diverse water systems surpassed those of membrane materials lacking NHC. The exploration of the multifunctional evaporator offers a novel approach to achieving high-efficiency utilization of solar energy for the conversion of both seawater and industrial wastewater into freshwater.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"114 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heteroatom number-dependent cluster frameworks in structurally comparable Pd–Au nanoclusters","authors":"Ziwei Fu, Chen Li, Ye Tian, Fakhari Alam, Daqiao Hu, Honglei Shen, Xi Kang, Manzhou Zhu","doi":"10.1039/d4nr05222f","DOIUrl":"https://doi.org/10.1039/d4nr05222f","url":null,"abstract":"Investigating the impact of heteroatom alloying extents on regulating the cluster structures is crucial for the fabrication of cluster-based nanomaterials with customized properties. Herein, two structurally comparable Pd<small>_<em>x</em></small>Au<small>₁₂</small> (<em>x</em> = 1, 2) nanoclusters with a uniform surface environment but completely distinct kernel configurations were controllably synthesized and structurally determined. The single Pd-alloyed <strong>Pd<small>₁</small>Au<small>₁₂</small></strong> nanocluster retained an icosahedral metal framework, while the <strong>Pd<small>₂</small>Au<small>₁₂</small></strong> nanocluster with two Pd heteroatoms exhibited a unique toroidal configuration. The additional Pd heteroatom not only led to significant changes in the cluster frameworks but also profoundly affected their electrocatalytic CO<small>₂</small> reduction performance. The <strong>Pd<small>₁</small>Au<small>₁₂</small></strong> nanocluster demonstrated enhanced catalytic performance, exhibiting a higher current density, a lower onset potential, and greater CO faradaic efficiency compared to the <strong>Pd<small>₂</small>Au<small>₁₂</small></strong> nanocluster. This work offers new insights into the customization of the structures and properties of gold nanoclusters by regulating the doping degree of Pd heteroatoms.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"38 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetic Analysis of Silver Nanowire Synthesis: Polyol Batch and Continuous Millifluidic Methods","authors":"Destiny Williams, James Smay, Shohreh Hemmati","doi":"10.1039/d4nr03812f","DOIUrl":"https://doi.org/10.1039/d4nr03812f","url":null,"abstract":"This study investigates the variation in rate constants for nucleation and growth of silver nanowires (AgNWs) synthesized using the polyol method in batch and millifluidic flow reactors (MFRs). In a particular reactor, silver ion concentration at any time is quantified by the method of El-Ghamry et al. and the non-linear two-step Finke-Watzky model is used to determine the rate constants for nucleation (k1) and growth (k2). The results indicate that k1 and k2 for the MFRs are approximately four and two times larger, respectively, than the batch reactor rate constants. Additionally, the concentration, yield, and diameter of the synthesized AgNWs were determined using ultraviolet-visible (UV-vis) spectroscopy data. The results indicated that the concentration and yield of AgNWs synthesized using the MFR were approximately 10 times higher than those obtained with the batch reactor. Overall, AgNW synthesis in MFRs is about three times faster than the batch reactor. The coiled configuration of the MFRs promotes AgNW growth, minimizes temperature transients, and enhances reagent mixing caused by Dean vortices. This study highlights the potential of MFRs for the continuous synthesis of AgNWs and provides insights into the underlying growth mechanism.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"48 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced directional transfer of charge carriers and optimized electronic structure in fluorine doped polymeric carbon nitride nanosheets for efficient photocatalytic water splitting","authors":"Changxue Dong, Jin Zhang, Qiuyan Chen, Hongrong Luo, Jinwei Chen, Ruilin Wang","doi":"10.1039/d4nr04550e","DOIUrl":"https://doi.org/10.1039/d4nr04550e","url":null,"abstract":"The high photogenerated charge carrier recombination and sluggish oxygen evolution reaction (OER) of polymeric carbon nitride (PCN) photocatalysts limit its application in photocatalytic water splitting. Herein, fluorine (F) doped PCN (PCNF-x) nanosheets with high crystallinity were prepared by dicyandiamide (C2H4N4) and ammonium hydrogen fluoride (NH4HF2) through high temperature thermal polymerization. This process not only resulted in PCNF-x nanosheets with a large number of pores, but also improved the crystallinity of PCNF-x nanosheets. Under illumination, the PCNF-0.5 nanosheets exhibited an excellent photocatalytic water splitting activity with a comparable H2 evolution rate of 135.30 μmol h-1 g-1 and O2 evolution rate of 63.75 μmol h-1 g-1, which were 2.3-fold, 3.3-fold, and 25-fold as compared to that of PCNF-1, PCNF-0.2, and pristine PCN nanosheets, respectively. Photoluminescence (PL) spectra and density functional theory (DFT) calculations indicate that F doping PCN nanosheets brings two changes in PCNF-x nanosheets, the one is the increase in crystallinity after F doping effectively weakens the bulk defects of PCNF nanosheets, which conducive to the directional transfer of charge carriers; the other is the modulation of electronic structure after F doping, which optimize the reaction mechanism of OER in PCNF-x nanosheets. Both the enhancement in charge carrier transfer and the optimization in reaction mechanism significantly contribute to the improved photocatalytic performance of water splitting in the fluorine doped PCN nanosheets.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"4 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asymmetric self-organization from a symmetric film by phase separation","authors":"Tomoya Horide, Miya Usuki, Manabu Ishimaru, Yoichi Horibe","doi":"10.1039/d4nr04343j","DOIUrl":"https://doi.org/10.1039/d4nr04343j","url":null,"abstract":"Self-organization realizes various nanostructures to control material properties such as superconducting vortex pinning and thermal conductivity. However, the self-organization of nucleation and growth is constrained by the growth geometric symmetry. To realize highly controlled three-dimensional nanostructures by self-organization, nanostructure formation that breaks the growth geometric symmetry thermodynamically and kinetically, such as tilted or in-plane aligned nanostructures, is a challenging issue. A vertically aligned nano-checkerboard is typically formed from ZnMnGaO<small>₄</small> with the twin domain vertically aligned by the stress from the MgO substrate. The change in the template structure is promising to form a different type of nanostructure. The cubic ZnMnGaO<small>₄</small>/MgO films were annealed to form nanoscale tetragonal domains in the tilted direction from the surface, which is determined by lattice mismatch, lattice symmetry, and atomic bonding. On the other hand, as a result of free deformation, in-plane aligned twin domains were formed on the SrTiO<small>₃</small> substrate with a thin MgO buffer layer, which does not induce stress in the ZnMnGaO<small>₄</small> film. By annealing the ZnMnGaO<small>₄</small>/MgO/SrTiO<small>₃</small> film, the nano-checkerboard with a size of ∼10 nm and a length of ∼200 nm is elongated to the in-plane [100] or [001] direction. This study demonstrates the possibility of fabricating a nanostructure that breaks the growth geometric symmetry, which is not achieved by the previous self-organization. The phase separation with controlled template opens more complicated three-dimensional structures by self-organization.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"22 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}