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SSRN 2023年

作者： Ma, Zhuangzhuang Zhang, Xiuhai Xiao, Changlin Gao, Xiaotong Wang, Hongqiang Jia, Lichao Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University 620 West Chang’an Street Shaanxi Xi’an710119 China State Key Laboratory of Solidification Processing Center for Nano Energy Materials School of Materials Science and Engineering Northwestern Polytechnical University Shaanxi Joint Labortary of Graphene Xi’an710072 China

Metal oxide semiconductor-based gas sensors often require noble metals for modification to enhance the carrier mobility of the material. However, current noble metal modifications are almost always performed at the material surface, making it difficult to apply them to the particle boundaries (PBs) of the material, which can greatly reduce the utilization of noble metals. We herein synthesized Pt nanocrystals (NCs) with average size of 1 nm by the technology of pulsed laser irradiation, followed by in situ embedded at the PBs of SnO2 nanofibers to address the unwanted carrier loss at PBs for substantially improved gas sensing. The Pt NCs/SnO2 exhibited 2.23-fold enhancement of response values, and 2.86-fold improvement on selectivity for NO2 at 50oC, comparing to these samples without PBs engineering. Further analysis showed that the enhancement of the gas-sensitive performance is mainly due to the electronic and chemical sensitization of Pt NCs at the SnO2 PBs and the high utilization of Pt NCs leading to a significant increase in the carrier mobility of the material. We thus believe present work provides an efficient alternative for developing high performance gas sensing based on materials with intrinsic particle boundaries. © 2023, The Authors. All rights reserved.

关键词： Pulsed lasers

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Coupling Manipulation of Interfacial Chemistry and Coordination Structure in Vanadium Oxides Enables Rapid Magnesium Ion Diffusion Kinetics

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Angewandte Chemie 2024年第2期137卷

作者： Weixiao Wang Wenwen Wang Prof. Fangyu Xiong Jiashen Meng Jinsong Wu Wei Yang Juncai Long Jinghui Chen Jiajun Chen Prof. Qinyou An State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China College of Materials Science and Engineering Chongqing University Chongqing 400030 China

Rechargeable magnesium batteries (RMBs) are a highly promising energy storage system due to their high volumetric capacity and intrinsic safety. However, the practical development of RMBs is hindered by the sluggish Mg 2+ diffusion kinetics, including at the cathode-electrolyte interface (CEI) and within the cathode bulk. Herein, we propose an efficient strategy to manipulate the interfacial chemistry and coordination structure in oligolayered V 2 O 5 (L−V 2 O 5 ) for achieving rapid Mg 2+ diffusion kinetics. In terms of the interfacial chemistry, the specific exposed crystal planes in L−V 2 O 5 possess strong electron donating ability, which helps to promote the degradation dynamics of C−F/C−S bonds in the electrolyte, thereby establishing the inorganic-organic interlocking CEI layer for rapid Mg 2+ diffusion. In terms of the coordination structure, the straightened V−O structure in L−V 2 O 5 provides efficient ions diffusion path for accelerating Mg 2+ diffusion in the cathode. As a result, the L−V 2 O 5 delivers a high reversible capacity (355.3 mA h g −1 at 0.1 A g −1 ) and an excellent rate capability (161 mAh g −1 at 1 A g −1 ). Impressively, the interdigital micro-RMBs is firstly assembled, exhibiting excellent flexibility and practicability. This work gives deeper insights into the interface and interior ions diffusion for developing high-kinetics RMBs.

关键词： Rechargeable magnesium batteries Interfacial chemistry Atomically thin vanadium oxide Interdigital microdevices

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Reliable synthesis of Large-Area Monolayer WS2 Single Crystals, Films, and Heterostructures with Extraordinary Photoluminescence Induced by Water Intercalation

arXiv

引用

arXiv 2023年

作者： Zhang, Qianhui Lu, Jianfeng Wang, Ziyu Dai, Zhigao Zhang, Yupeng Huang, Fuzhi Bao, Qiaoliang Duan, Wenhui Fuhrer, Michael S. Zheng, Changxi Department of Civil Engineering Monash University ClaytonVIC3800 Australia School of Chemistry Monash University ClaytonVIC3800 Australia Department of Material Science and Engineering Monash University ClaytonVIC3800 Australia State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Monash Centre for Atomically Thin Materials Monash University ClaytonVIC3800 Australia Monash University ClaytonVIC3800 Australia

Two-dimensional (2D) transition metal dichalcogenides (TMDs) hold great potential for future low-energy optoelectronics owing to their unique electronic, optical, and mechanical properties. Chemical vapor deposition (CVD) is the technique widely used for the synthesis of large-area TMDs. However, due to high sensitivity to the growth environment, reliable synthesis of monolayer TMDs via CVD remains challenging. Here we develop a controllable CVD process for large-area synthesis of monolayer WS2 crystals, films, and in-plane graphene-WS2 heterostructures by cleaning the reaction tube with hydrochloric acid, sulfuric acid and aqua regia. The concise cleaning process can remove the residual contaminates attached to the CVD reaction tube and crucibles, reducing the nucleation density but enhancing the diffusion length of WS2 species. The photoluminescence (PL) mappings of a WS2 single crystal and film reveal that the extraordinary PL around the edges of a triangular single crystal is induced by ambient water intercalation at the WS2-sapphire interface. The extraordinary PL can be controlled by the choice of substrates with different wettabilities. Copyright © 2023, The Authors. All rights reserved.

关键词： Chemical vapor deposition

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Unraveling the Atomic Structure Evolution of Titanium Nitride Upon Oxidation

SSRN

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SSRN 2024年

作者： Hao, Ronghui Miao, Wenkang Xu, Wanyin Lin, Yicheng Xiao, Qi-Ling Wang, Zihan Li, Qianqian Wang, Peng Wang, Tianzhong Nie, Anmin Wu, Jinsong Wang, Hong Tao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China Materials Genome Institute Shanghai University Shanghai200444 China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering Science Shanghai University Shanghai200444 China China Academy of Engineering Physics Mianyang621000 China Center for High Pressure Science State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China Center for X-mechanics Zhejiang University Hangzhou310027 China Institute of Applied Mechanics Zhejiang University Hangzhou310027 China

In this study, state-of-the-art aberration-corrected environmental transmission electron microscopy is utilized to investigate the atomic-scale structural evolution of titanium nitride during dynamic oxidation. Titanium nitride oxidation originates from the migration of Ti atoms along {200} that results in two distinct reaction pathways, characterized by the formation of chains of titanium vacancies and staggered titanium vacancies. We demonstrate that titanium atoms exhibit varied oxidation activity on different crystal facets, with the selection of oxidation pathways significantly influenced by the curvature of the crystal surface, which is also supported by the First Principles Calculations. © 2024, The Authors. All rights reserved.

关键词： High resolution transmission electron microscopy

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The Self-Assembling Growth of Copper Nanowires for Transparent Electrodes

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Journal of Wuhan University of technology(materials Science) 2019年第1期34卷 145-149页

作者： WU Junqing HUANG Fuzhi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology School of Aerospace Transport and Manufacturing Cranfield University

Long(15-40 μm), thin(diameter of 20 ± 5 nm), and well-dispersed CuNWs Cu nanowires were prepared. The high-resolution TEM and selected area electron diffraction showed that the CuNWs were single-crystalline. To investigate the growth mechanism, we examined the microstructure of these CuNWs at different reaction time. It was found that the CuNWs were actually formed through the self-assembling of Cu nanoparticles along the [110] direction. The transparent electrodes fabricated using the CuNWs achieved a high transparency of 76 % at 31±5 Ω/□.

关键词： Cu nanowires growth mechanism self-assembling transparent electrodes

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Efficient Water Dissociation on Confined Ultrafine Pt via Pyridinic N-Enhanced Heavy d−π Interaction

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Chemistry of materials 2022年第18期34卷 8271-8279页

作者： Yuan Dong Jiang-Bo Chen Jie Ying Yu-Xuan Xiao Ge Tian Mark D. Symes Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering & NRC (Nanostructure Research Centre) & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao) Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China WestCHEM School of Chemistry University of Glasgow University Avenue Glasgow G12 8QQ U.K.

Sluggish water dissociation on Pt electrocatalysts results in poor performance for the alkaline hydrogen evolution reaction (HER) and thus greatly limits their practical application in industrial water electrolysis. Herein, ultrafine Pt nanoparticles have been confined into N-doped carbon by an in situ galvanic replacement reaction, and the pyridinic N-enhanced heavy d−π interaction is found to significantly enhance the water dissociation catalytic activity of Pt. The electron-deficient Pt generated by this enhanced heavy d−π effect exhibits an ultralow overpotential for hydrogen evolution of 10 mV at a current density of 10 mA cm–2and an ultrahigh mass current density of 7.74 mA μgPt–1at an overpotential of 70 mV (7.9-fold higher than that of commercial Pt/C). Theoretical calculations reveal that the pyridinic N-enhanced heavy d−π effect can largely reduce the water dissociation energy barrier on Pt, thus greatly enhancing Pt’s performance for the alkaline HER.

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Highly sensitive strain sensor from topological-structure modulated dielectric elastic nanocomposites

arXiv

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arXiv 2021年

作者： Fan, Youjun Shen, Zhonghui Zhou, Xinchen Dan, Zhenkang Zhou, Le Ren, Weibin Tang, Tongxiang Bao, Shanyong Nan, Cewen Shen, Yang State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Center for Flexible Electronics Technology Tsinghua University Beijing100084 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan430070 China

Flexible strain sensors are critical to several potential intelligent applications, such as human-machine interfaces, soft robotics, human motion detection, and safety monitoring of components. Stretchable functional materials are important components of strain sensors, and they are still major challenges for high performance strain sensors. Herein, we demonstrate a novel strategy of designing and optimizing flexible strain sensor by developing topological structure modulated high permittivity elastic nanocomposite. The topological structure with three-phase percolative nano-nanonetworks produces synergistic effects of space charge enhancement and local electric field modulation, and it gives rise to an ultrahigh dielectric permittivity (113.4, at 1 kHz, over 1500% enhancement than that of commercial elastic polyurethane matrix) and excellent comprehensive electromechanical performance, and the optimal comprehensive electromechanical performance reaches to 542.91 MPa-1, which is over 9-fold than that of commercial polyurethane elastic film. An interdigital capacitive strain sensor is designed using the topological structured elastic dielectric nanocomposite. It possesses high initial capacitance density and positive capacitance response with stain, achieving high signal-to-noise ratio, high capacitance response sensitivity, and wide linear range, and it breaks through disadvantages of negative sensitivity and narrow linear range for conventional interdigital strain sensors. The prepared integrated strain sensor arrays are able to measure local strain of convoluted surfaces and monitor the motion of soft actuators in real time, and they would make conditions for intelligent control systems and the study of morphological intelligence. Copyright © 2021, The Authors. All rights reserved.

关键词： Nanocomposites

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Improvement of the Degradation Activity of Phanerochaete Chrysosporium by Hybridization with Silica Nanoparticles

SSRN

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SSRN 2023年

作者： Li, Qichang Geng, Wei Hu, Zhiyi Lu, Yi Xie, Hao Deng, Zhao Yang, Xiaoyu Li, Yu Su, Baolian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan China Laboratory of Inorganic Materials Chemistry University of Namur 61 rue de Bruxelles NamurB-5000 Belgium School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan China Heinrich Heine University Düsseldorf Germany Harvard University United States

Silica nanoparticle hybridized P. chrysosporium mycelia pellets was prepare by a simple one-step composite technology-based approach, involving co-culturing silica nanoparticles with this fungus under mild culture conditions. The generated hybrid displays greatly improved peroxidase activity which reaches a maximum on the 5th day of culturing. Hybridization causes a morphology change and significantly enhances the rate of crystal violet degradation, the amounts of excreted extracellular manganese peroxidase and hydrogen peroxide, and the rate of glucose consumption. The results show that hybridization with silica nanoparticles significantly enhances of the degradation activity of P. chrysosporium cells. © 2023, The Authors. All rights reserved.

关键词： Silica nanoparticles

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Phase Transitions in Mixed-Dimensional Perovskite: From Film Formation Evolution to its Impact on Optoelectronic Properties

SSRN

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SSRN 2024年

作者： Xiang, Jin Wang, Fei Liang, Xiao Duan, Dawei Yuan, Mingjian Wu, Tom Hu, Hanlin Shi, Yumeng International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen518060 China Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University Shenzhen518055 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China College of Chemistry and Chemical Engineering Jishou University Hunan Jishou416000 China College of Chemistry Nankai University Tianjin300071 China Department of Applied Physics The Hong Kong Polytechnic University Kowloon999077 Hong Kong Key Laboratory of Luminescence and Optical Information Ministry of Education School of Physical Science and Engineering Beijing Jiaotong University Beijing100044 China

The integration of 2D/3D mixed-dimensional structures in perovskite solar cells (PSCs) has been demonstrated to substantially improve both their photovoltaic performance and device stability. However, the detailed formation mechanism of these mixed-dimensional perovskite phases remains largely unexplored. In this study, we investigate the in-depth formation evolution of mixed-dimensional perovskite phases using the pre-adding method under both one-step and two-step processing condition, where the HTAB ligand molecule is introduced into the perovskite precursor solution beforehand. In the two-step sequential deposition method, 2D perovskite phases formed sequentially via 2D-α/β/γ (upon the assistance of IPA solvent) → 2D-7.6° (upon thermal annealing) → 2D-7.3° (upon thermal annealing). Conversely, in the one-step method, a distinct progression is noted: 2D-7.6° (HTAB ligand react with intermediate phase) → 2D-7.3°. The 2D-α/β/γ phases exhibit extremely thin, belt-like crystals that cover the 3D perovskite surface, the 2D-7.6° phase trends to envelop the 3D perovskite grains without clear crystal morphology, while the 2D-7.3° phase forms distinct platelet-shaped crystals interspersed among the 3D perovskite grains. Leveraging the defect passivation properties of those mixed-dimensional perovskite phases, as well as improved film morphology and crystallinity adjusted by HTAB ligand, an external electroluminescence quantum efficiency (EQELED) of 13.5% is achieved in PSCs with a non-radiative voltage loss of just 52 mV, promoting the power conversion efficiency to 24.54%. This work offers the significant insights into the phase-transition of mixed-dimensional perovskite and their impact on the optoelectronic properties. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Thickness Dependence of Structural and Optical Properties of Chromium Thin Films as an Infrared Reflector for Solar-thermal Conversion Applications

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Journal of Wuhan University of technology(materials Science) 2019年第6期34卷 1239-1247页

作者： LI Qingyu GONG Dianqing CHENG Xudong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

The thermal emittance of Cr film, as an IR reflector, was investigated for the use in SSAC. The Cr thin films with different thicknesses were deposited on silicon wafers, optical quartz and stainless steel substrates by cathodic arc ion plating technology as a metallic IR reflector layer in SSAC. The thickness of Cr thin films was optimized to achieve the minimum thermal emittance. The effects of structural, microstructural, optical, surface and cross-sectional morphological properties of Cr thin films were investigated on the emittance. An optimal thickness about 450 nm of the Cr thin film for the lowest total thermal emittance of 0.05 was obtained. The experimental results suggested that the Cr metallic thin film with optimal thickness could be used as an effective infrared reflector for the development of SSAC structure.

关键词： thermal emittance chromium thin film solar selective absorbing coating cathodic arc ion plating

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