ACS Applied Nano Materials最新文献

{"title":"Humidity-Dependent Tribological Performance of Ti3C2Tx/MoS2 Nanosheet-Based Hybrid Coatings","authors":"Guido Boidi,&nbsp;Dario Zambrano,&nbsp;Manel Rodríguez Ripoll and Andreas Rosenkranz*,&nbsp;","doi":"10.1021/acsanm.4c0485810.1021/acsanm.4c04858","DOIUrl":"https://doi.org/10.1021/acsanm.4c04858https://doi.org/10.1021/acsanm.4c04858","url":null,"abstract":"<p >Two-dimensional (2D) materials are known to induce excellent solid lubrication performance. However, their performance largely depends on the ambient conditions (working atmosphere), since moisture and oxygen deteriorate the frictional properties of MoS₂ and MXenes. Currently, little knowledge is available regarding the humidity-dependent tribological performance of MXene coatings. Therefore, our contribution aims at experimentally evaluating the tribological performance of multilayer Ti₃C₂T<i>_x</i>/MoS₂ hybrid coatings used as solid lubricants dependent on the relative humidity (10, 35, and 70%). For this purpose, mixed (50% multilayer Ti₃C₂T<i>_x</i> and 50% MoS₂) and bilayer (bottom Ti₃C₂T<i>_x</i> and top layer MoS₂) hybrid coatings were deposited via spray-coating on chromium steel discs to be tested under dry reciprocating conditions using ball-on-disk tribometry. Our results show that both hybrid coatings performed best under low relative humidities, thus notably improving the resulting friction and wear performance. The favorable tribological mechanism was mainly attributed to the low-shear stress between sulfides derived from MoS₂. At higher relative humidities, the formation of oxides detrimentally affected lubrication, thus causing friction to increase and leading to more pronounced wear. This study sheds light on the underlying mechanisms governing friction and wear for hybrid MXene/MoS₂ coatings tested at different humidity levels.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609243","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":"Poly(vinyl alcohol) Hydrogels Enhanced with Ti3C2Tx MXene Nanosheets and Aramid Nanofibers for Electromagnetic Shielding and Motion Detection","authors":"Chen Wang,&nbsp;Zhijia Zhu,&nbsp;Liujia Han,&nbsp;Lihui Xu,&nbsp;Meng Wang,&nbsp;Qian Li,&nbsp;Chunyan Hu* and Baojiang Liu*,&nbsp;","doi":"10.1021/acsanm.4c0484010.1021/acsanm.4c04840","DOIUrl":"https://doi.org/10.1021/acsanm.4c04840https://doi.org/10.1021/acsanm.4c04840","url":null,"abstract":"<p >The progress in electronic devices has led to more electromagnetic pollution. The importance of green and stable electromagnetic shielding devices cannot be overstated. Here, a PVA hydrogel reinforced by MXene and aramid nanofibers (ANFs) is prepared through solution exchange, freeze–thaw cycles, and the process of salting out. The unidirectional porous wall structure, combined with a water-rich environment connecting the MXene-dominated conductive network, and the rich interfaces endow the hydrogel with excellent EMI SE in the X-band at extremely low filler concentrations (1.5 wt %), reaching up to 64.5 dB. We determine the effect of MXene and water on the electromagnetic shielding effect by adjusting the content of MXene and water. The EMI SE of the 3 mm hydrogel increases by 33.4 dB when the MXene concentration augments from 0 to 1.5 wt %. Similarly, when the water content of hydrogels augments from 0 to 95 wt %, their EMI SE augments from 7.86 to 52 dB. In addition, the hydrogel exhibits excellent pressure sensing performance, capable of detecting motion with response and recovery times of 210 and 110 ms, respectively, and an optimal sensitivity of 0.308 kPa^–1. It can also encode and encrypt information based on different signals, presenting profound prospects for smart sensing and wearable devices.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609079","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":"Role of Point Defects and Ion Intercalation in Two-Dimensional Multilayer Transition Metal Dichalcogenide Memristors","authors":"Mohit D. Ganeriwala*,&nbsp;Alejandro Toral-López,&nbsp;Estela Calaforra-Ayuso,&nbsp;Francisco Pasadas,&nbsp;Francisco G. Ruiz,&nbsp;Enrique G. Marin and Andres Godoy*,&nbsp;","doi":"10.1021/acsanm.4c0476910.1021/acsanm.4c04769","DOIUrl":"https://doi.org/10.1021/acsanm.4c04769https://doi.org/10.1021/acsanm.4c04769","url":null,"abstract":"<p >Two-dimensional materials, in particular transition metal dichalcogenides (TMDs), have attracted a nascent interest in the implementation of memristive architectures. In addition to being functionally similar to synapses, their nanoscale footprint promises to achieve the high density of a biological neural network in the context of neuromorphic computing. However, in order to advance from the current exploratory phase and reach reliable and sound memristive performances, an understanding of the underlying physical mechanisms in TMD memristors seems imperative. Despite the distinctive transport medium inherent to multilayer TMDs, the memristance is routinely attributed to defects or metal atoms present in the system, with their precise contribution remaining elusive. Specifically, the role of intrinsic point defects in the formation of conductive channels, although shown for monolayer TMDs, is not conclusively studied for multilayer samples. In this work, using density functional theory (DFT) and nonequilibrium Green’s function (NEGF) formalism, a systematic study is carried out to analyze the impact that defects and metal atoms produce on the out-of-plane conductivity of multilayer TMDs. MoS₂, a representative of the 2H structural configuration, and PtS₂, a representative of the 1T structure, the most common crystal arrangements among TMDs, are used for this analysis. It is found that the intrinsic sulfur vacancies, which are the dominant defects present in both TMDs, appear to be insufficient in causing resistive switching on the application of an external bias. The claim that the intrinsic point defects on their own can realize a valence change memory-type device by providing a controllable conductive channel through the van der Waals structure seems, according to our study, improbable. The presence of metallic atoms is demonstrated to be essential to trigger the memristive mechanism, emphasizing the proper choice of a metal electrode as being critical in the fabrication and optimization of memristors using TMDs.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsanm.4c04769","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609084","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":"MoS2/MoOx Nanoflake-Based Dual-Functional Antenna Sensors for Highly Sensitive and Selective Detection of Volatile Organic Compounds","authors":"Mohammad Mahmudul Hasan*,&nbsp;Onur Alev*,&nbsp;Eda Goldenberg* and Michael Cheffena*,&nbsp;","doi":"10.1021/acsanm.4c0497510.1021/acsanm.4c04975","DOIUrl":"https://doi.org/10.1021/acsanm.4c04975https://doi.org/10.1021/acsanm.4c04975","url":null,"abstract":"<p >In this paper, we present for the first time a highly sensitive, dual-functional antenna sensor functionalized with molybdenum disulfide/oxide heterostructures (MoS₂/MoO_<i>x</i> NFs) for selective detection of methanol gas and wireless communications, simultaneously. The proposed antenna sensor uniquely features optimized deposition of the sensing material and structure, allowing sensitive, selective gas detection without interrupting communication. The sensing materials were synthesized via a simple hydrothermal method and characterized using scanning electron microscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy (XPS). XRD and XPS analysis confirmed the formation of MoS₂/MoO_<i>x</i> heterostructure and indicated the presence of oxide states within the structure. First, the gas sensing ability and electrical properties of MoS₂ NF were investigated using chemiresistive transducers. Integrating this with a wideband monopole antenna, a highly sensitive, dual-functional antenna sensor was developed. We optimized the sensing material for sensitivity and tested against volatile organic compounds. Chemiresistive sensors exhibit linear detection but suffer initial fluctuations and baseline shifts at room temperature, which can be mitigated using antenna sensors with RF signals. The sensor demonstrated high selectivity, with methanol producing the strongest response among equal concentrations of methanol, ethanol, isopropanol, and acetone. The developed antenna sensor exhibited high sensitivity of approximately 1 MHz/1000 ppm against methanol. In addition, the calculated detection limit (DL) of the antenna sensor was 52 ppm, which is significantly lower than that of the chemiresistive sensor (799 ppm). The results indicated that with a lower DL than the safety threshold for methanol (200 ppm), the proposed antenna sensor is ideal for monitoring methanol gas in risky indoor environments. Moreover, the sensor’s gas sensing capability does not affect the antenna’s communication performance, indicating its potential for seamless integration into wireless sensor networks.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsanm.4c04975","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609239","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":"Enhanced Dual-Emission Properties of Mn-Doped CsPbCl3/ZIF-8 Nanocomposites for Display","authors":"Niu Lai,&nbsp;Guangsheng Liu,&nbsp;Yuewei Li,&nbsp;Yanqiong Yang,&nbsp;Maoxin He,&nbsp;Shaoqi Hou,&nbsp;Steven J. Langford,&nbsp;Jiayan Liao*,&nbsp;Yu Yang* and Rongfei Wang*,&nbsp;","doi":"10.1021/acsanm.4c0492810.1021/acsanm.4c04928","DOIUrl":"https://doi.org/10.1021/acsanm.4c04928https://doi.org/10.1021/acsanm.4c04928","url":null,"abstract":"<p >Mn-doped CsPbX₃ quantum dots (QDs) are recognized for their dual-emission characteristics and low lead content, making them valuable in display applications. In this study, dual-emission peaks at 406 and 589 nm were achieved in Mn-doped CsPbCl₃ QDs through a high-temperature thermal injection method. The 406 nm peak is sourced from the QD host, while the 589 nm peak results from Mn doping. Enhancement of both emission peaks is observed when Mn-doped QDs are integrated with ZIF-8 material via in situ growth, leading to a greater than 3-fold increase in emission intensity. The resulting composite material demonstrates considerable stability, retaining over 40% intensity under UV light, 50% under continuous heating at 100 °C, and 44% in air exposure after 25 days. These results highlight the potential of nanomaterials for high-performance optoelectronic devices.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609241","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":"Hydrophilic Cu-Graphene Heterostructure Fillers for the Enhancement of the Thermal Performance of Poly(vinyl Alcohol)-Based Composites","authors":"Changyu Pu,&nbsp;Xin Wang,&nbsp;Enchan Wang,&nbsp;Yuyang Wu,&nbsp;Xinru Zhang*,&nbsp;Jiahao Liu,&nbsp;Yanqiang Di,&nbsp;Zeyi Jiang,&nbsp;Lin Qiu*,&nbsp;Ting Gao,&nbsp;Aihui Chou and Xinxin Zhang,&nbsp;","doi":"10.1021/acsanm.4c0464510.1021/acsanm.4c04645","DOIUrl":"https://doi.org/10.1021/acsanm.4c04645https://doi.org/10.1021/acsanm.4c04645","url":null,"abstract":"<p >Developing polymer-based composites using high-performance heterostructure fillers is of significant importance for the thermal management of electronic devices. Herein, hydrophilic copper-graphene (Cu-GNP) heterostructure fillers modified with amino functional groups via polydopamine surface modification and calcination reduction were prepared. Subsequently, Cu-GNP/poly(vinyl alcohol) (PVA) thermal conductive composites were fabricated using a solution blending method, where hydrogen bonds were formed between the fillers and the PVA matrix. For composites containing 20 wt % Cu-GNP fillers, their in-plane thermal conductivity reaches 18.49 W·m^–1·K^–1 and the tensile strength is 25.97 MPa, representing increases of 20.61% and 24.25%, respectively, compared to GNP/PVA composites with equivalent filler contents. This improvement is attributed to the enhanced interaction between Cu-GNP and the PVA matrix due to the formation of hydrogen bonds. Additionally, these composites also exhibit a certain level of electrical insulation properties, making them promising candidates for heat dissipation applications in electronic devices.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142608836","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":"Core/Shell Metal Oxides@MIL-53(Al) Nanoparticles as Catalyst for the Selective Hydrogenation of Cinnamaldehyde","authors":"Wenjing Li,&nbsp;Weichen Wang,&nbsp;Mingyue Zhu,&nbsp;Peiao Cong,&nbsp;Daowei Gao,&nbsp;Rongyao Wang* and Guozhu Chen*,&nbsp;","doi":"10.1021/acsanm.4c0471410.1021/acsanm.4c04714","DOIUrl":"https://doi.org/10.1021/acsanm.4c04714https://doi.org/10.1021/acsanm.4c04714","url":null,"abstract":"<p >Metal oxides@metal–organic framework (MOFs)-based core/shell nanostructures demonstrate promising potential in catalytic hydrogenations. However, the direct nucleation and growth of MOFs on the topologically diverse surfaces of metal oxides face significant challenges due to the high interfacial energy resulting from topological mismatches. Herein, we present a facile <i>in situ</i> growth strategy for directly assembling an MIL-53(Al) layer on the surface of CeO₂ nanospheres at low temperatures by mixing and stirring CeO₂ nanospheres and MIL-53(Al) precursors without requiring sacrificial templates or additional surface modifications. Moreover, key factors such as reaction time, temperature, and the types of aluminum salts and ligands are systematically explored to comprehensively understand the nucleation behavior of MOFs shells. Notably, when active Pt nanoparticles are sandwiched between the CeO₂ core and the MIL-53(Al) shell, the MIL-53(Al) effectively stabilizes the Pt nanoparticles and enhances the selectivity of hydrocinnamaldehyde in cinnamaldehyde hydrogenation. CeO₂/Pt@MIL-53(Al) achieved more than twice the selectivity for HCAL compared to CeO₂/Pt and even outperformed Pt/MIL-53(Al). Undoubtedly, this study provides distinctive insights into the nucleation and growth mechanisms of MOFs on metal oxides, expands the strategies for fabricating metal oxides@MOFs core/shell nanostructure, and proposes innovative ideas and possibilities for broadening the application domains of MOFs-based materials.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609083","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":"Synergistic Effect of Ionic Liquid and Superwettability Enables Large-Scale Fabrication of Aligned Silver Nanowire-Based Transparent Electrodes","authors":"Chuao Ma,&nbsp;Xingchao Chen,&nbsp;Yuqiang Zhang,&nbsp;Chan Liu,&nbsp;Hongliang Liu* and Shen Diao*,&nbsp;","doi":"10.1021/acsanm.4c0496410.1021/acsanm.4c04964","DOIUrl":"https://doi.org/10.1021/acsanm.4c04964https://doi.org/10.1021/acsanm.4c04964","url":null,"abstract":"<p >Aligned and cross-aligned silver nanowires (AgNWs) have emerged as a promising class of flexible transparent electrodes (FTEs) for broad applications in flexible optoelectronic devices. However, the large-scale fabrication of aligned AgNWs remains challenging due to special setups, rigid condition control, and complex procedures. Here, we show that the synergistic effect of ionic-liquid-induced localized orientation at the air–water interface and subsequent superwettability-enhanced orientation induced by spontaneous transfer leads to the alignment of AgNWs. This strategy enables the facile and scalable fabrication of large-area aligned AgNWs and layer-by-layer fabrication of cross-aligned AgNWs FTEs with sheet resistance of 11–20 Ω s<i>q</i>^–1 and transmittance of 86%–92% at 550 nm. The cross-aligned AgNWs FTEs can be applied for flexible electronic devices such as transparent heaters, electroluminescent devices, and touch panels, exhibiting high optoelectrical performances. Our results shed light on exploration of large-area production of aligned AgNWs and provide an effective approach to prepare high-performance cross-aligned AgNWs FTEs for a variety of flexible electronic devices.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142608621","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":"Hexagonal Te/TeOx Nanosheets for Anticancer, Photothermal, and NO2 Gas Sensing Applications","authors":"Snigdha Chakraborty,&nbsp;Apurav Guleria*,&nbsp;Vishwa V. Gandhi,&nbsp;Amit Kunwar,&nbsp;Kalpathy Ganapathy Girija,&nbsp;Kanhu Charan Barick,&nbsp;Suman Neogy,&nbsp;A. K. Debnath,&nbsp;Madhab Chandra Rath and Soumyakanti Adhikari,&nbsp;","doi":"10.1021/acsanm.4c0433210.1021/acsanm.4c04332","DOIUrl":"https://doi.org/10.1021/acsanm.4c04332https://doi.org/10.1021/acsanm.4c04332","url":null,"abstract":"<p >Herein, we present a highly rapid one-pot synthesis of Te/TeO_<i>x</i> nanosheets via high-energy electron beam irradiation. No external reducing agent was used as in situ generated solvated electrons reduced the precursors. Remarkably, the nanosheet formation was completed within seconds. UV–vis absorption spectra delineated a characteristic allowed direct transition from the valence band (p-bonding triplet) to the conduction band (p-antibonding triplet) at ∼275 nm, accompanied by a broad absorption band spanning 480–750 nm. X-ray photoelectron spectroscopy confirmed the nanomaterial composition as Te and TeO_<i>x</i>, corroborated by complementary X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy studies. Imaging techniques revealed the predominant formation of hexagon-shaped nanosheets, originating from the aggregation of initially formed one-dimensional (1D) nanostructures. Extensive pulse radiolysis investigations provided insights into the formation mechanism of Te-based nanomaterials. Further kinetic studies, involving variations in pH, absorbed dose, and water content in the nanoreactor, offered a profound understanding of the decay behavior of Te-based intermediate species. A notable aspect of this work is the exceptional anticancer efficacy (&gt;80%) demonstrated by Te/TeO_<i>x</i> nanosheets against A549 lung cancer cells while exhibiting negligible cytotoxicity toward normal WI38 cells. This finding has been explained based on the cellular uptake of the nanosheets and reactive oxygen species generation, as evidenced by atomic absorption spectrometry and the 2,7-dichlorodihydro fluorescein-diacetate fluorimetry assay, respectively. Further, Te/TeO_<i>x</i> nanosheets were explored as gas sensors, displaying outstanding sensitivity and selectivity toward NO₂, with a detection threshold as low as ≤1 ppm at ambient temperature. Additionally, these nanosheets exhibited significant photothermal conversion efficiency under NIR light irradiation. Reusability tests highlighted their remarkable stability and sustained heating efficacy, underscoring the immense potential of Te/TeO_<i>x</i> nanosheets as versatile photothermal nanoagents.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142608729","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":"Decavanadate Supported on Carbon Nitride Nanosheets as Photocatalysts for Selective C–H Bromination of Arenes Using KBr","authors":"Peihe Li*,&nbsp;Qingguang Li,&nbsp;Gelan Wang,&nbsp;Ye Lu,&nbsp;Jie Bai,&nbsp;Limei Duan,&nbsp;Sarina Sarina and Jinghai Liu*,&nbsp;","doi":"10.1021/acsanm.4c0490910.1021/acsanm.4c04909","DOIUrl":"https://doi.org/10.1021/acsanm.4c04909https://doi.org/10.1021/acsanm.4c04909","url":null,"abstract":"<p >The photocatalytic bromination of arene C–H bonds is a crucial and sustainable transformation in organic synthesis chemistry. However, traditional methods suffer from low efficiency, poor selectivity, and environmental concerns of bromine sources. Herein, we report a decavanadate-modified graphite nitride carbon catalyst (V₁₀-g-C₃N₄) that exhibits remarkable performance in the bromination of arene, utilizing nontoxic KBr as a bromine source under visible-light irradiation. The “electron sponge” property of decavanadate in catalysts not only enhances catalytic activity by suppressing the recombination of photogenerated carriers (electrons and holes) but also improves the activation of molecular oxygen via single-electron transfer (SET), further enhancing catalytic efficiency. In addition, the electrostatic interaction between decavanadate and graphite nitride carbon exhibited high stability and activity after five cycles, without a significant decrease. g-C₃N₄ primarily absorbs substrates through π–π interactions, while decavanadate offers Lewis-acid-type anchoring sites for O₂, enabling the activation of both substrates and O₂ through the SET process. Fluorescence quenching, radical trapping, and electron paramagnetic resonance (EPR) experiments highlight the pivotal importance of holes in enhancing substrate activation, while underscoring the crucial role of electrons in activating O₂ to ^•O₂^–. This work provides insights into the interaction between the decavanadate and organic semiconductor, enabling light-induced molecular transfer in green and sustainable chemistry.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142608972","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}