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Electrochemically Deposited Cu(II)/Cu(I) Oxide Heterostructure as Highly Sensitive Platform for Electrochemical Detection of Glucose and Methanol

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Journal of The Institution of Engineers (India): Series D 2024年第3期105卷 1361-1371页

作者： Mondal, Rimpa Ahmed, Sk. Faruque Mukherjee, Nillohit Department of Physics Aliah University West Bengal Newtown Kolkata700156 India School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology Shibpur West Bengal Howrah711103 India

Detection of glucose level and in human body is very essential in many ways. Besides glucose, methanol also plays crucial role in human physiology as it can influence human nervous system. So, detection of any imbalance in methanol level is also crucial. For this purpose, in this work, CuO/Cu2O bulk heterostructures were electrochemically deposited in the form of thin films on ITO-coated glass substrates using cyclic voltammetry and amperometrically. The deposited films were characterized using X-ray diffraction technique (XRD), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and UV–Vis spectroscopy. The electrochemical attributes of the deposited films towards glucose and methanol sensing were studied through cyclic voltammetry (CV), amperometric i-t and electrochemical impedance spectroscopy (EIS). From the linear fit plot, the sensitivity was found to be 237.7 µA µM−1 cm−2 with LoD (limit of detection) of 19.8 µM and up to 1.2 mM concentration of glucose. Further, for methanol, both LoD and sensitivity values were found to be 0.007 µM and 0.016 µA/µ***2, respectively. The results are quite promising for the deposited material for its possible real-life applications as sensing platform for the electrochemical D-glucose and methanol detections. © The Institution of Engineers (India) 2024.

关键词： Copper oxides

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Correlations in interacting electron liquids: Many-body statistics and hyperuniformity

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Physical Review B 2024年第10期110卷 104201页

作者： Haina Wang Rhine Samajdar Salvatore Torquato Department of Chemistry Department of Physics Princeton Center for Theoretical Science Princeton Materials Institute Program in Applied and Computational Mathematics

Disordered hyperuniform many-body systems are exotic states of matter with novel optical, transport, and mechanical properties. These systems are characterized by an anomalous suppression of large-scale density fluctuations compared to ordinary liquids. The structure factor of disordered hyperuniform systems often obeys the scaling relation S(k)∼Bkα with B,α>0 in the limit k→0. Ground states of d-dimensional free fermionic gases, which are fundamental models for many metals and semiconductors, are key examples of quantum disordered hyperuniform states with important connections to random matrix theory. However, the effects of electron-electron interactions as well as the polarization of the electron liquid on hyperuniformity have not been explored thus far. In this paper, we systematically address these questions by deriving the analytical small-k behaviors (and, associated, α and B) of the total and spin-resolved structure factors of quasi-one-dimensional, two-dimensional, and three-dimensional electron liquids for varying polarizations and interaction parameters. We validate that these equilibrium disordered ground states are hyperuniform, as dictated by the fluctuation-compressibility relation. Interestingly, free fermions, partially polarized interacting fermions, and fully polarized interacting fermions are characterized by different values of the small-k scaling exponent α and coefficient B. In particular, partially polarized fermionic liquids exhibit a unique form of multihyperuniformity, in which the net configuration exhibits a stronger form of hyperuniformity (i.e., larger α) than each individual spin component. The detailed theoretical analysis of such small-k behaviors enables the construction of corresponding equilibrium classical systems under effective one- and two-body interactions that mimic the pair statistics of quantum electron liquids. Our paper thus reveals that highly unusual hyperuniform and multihyperuniform states can be achieved in simple

关键词： Electronic structure Quantum many-body systems Two-dimensional electron gas

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Strong circularly polarized luminescence from quantum dots/2D chiral perovskites composites

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Nano Research 2023年第5期16卷 7593-7599页

作者： Qingqian Wang Hongmei Zhu Wei Chen Junjie Hao Zhaojin Wang Jun Tang Yingguo Yang Xiao Wei Sun Dan Wu Kai Wang Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China College of Engineering Physics Shenzhen Technology UniversityShenzhen 518118China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China Shanghai Advanced Research Institute Chinese Academy of ScienceShanghai 201210China

Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great importance for future ***,there is a key contradiction that in chiral perovskites chirality distorts the crystal structure,leading to poor photoluminescence(PL)*** the balance between chirality and PL is a major challenge for strong CPL from chiral ***,two-dimensional(2D)chiral perovskite has shown fascinating chiral induced spin selectivity(CISS)effect which can act as spin injector under ambient ***,we propose an effective strategy to achieve high CPL activity generated from quantum dots(QDs)by introducing 2D chiral perovskite as a chiral source,providing spin polarized carriers through the CISS *** as-synthesized QDs/CP composites exhibit dissymmetry factors(glum)up to 9.06×10^(−3).For the first time,we performed grazing incident wide angle X-ray scattering(GIWAXS)measurements,showing the chirality originates from the distorted lattices caused by the large chiral organic ***,time-resolved PL(TR-PL)measurements verify the enhanced CPL activity should be attributed to the charge transport between two *** findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spinoptoelectronics application.

关键词： circularly polarized luminescence colloidal quantum dots two-dimensional(2D)chiral perovskites grazing incident wide angle X-ray scattering(GIWAXS) chiral induced spin selectivity

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Boron-doped high-entropy oxide toward high-rate and long-cycle layered cathodes for wide-temperature sodium-ion batteries

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Journal of Energy Chemistry 2024年第8期95卷 577-587,I0012页

作者： Yuzhen Dang Zhe Xu Yurong Wu Runguo Zheng Zhiyuan Wang Xiaopin Lin Yanguo Liu Zheng-Yao Li Kai Sun Dongfeng Chen Dan Wang School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina Neutron Scattering Laboratory Department of Nuclear PhysicsChina Institute of Atomic EnergyBeijing 102413China

03-type layered metal oxides hold great promise for sodium-ion batteries cathodes owing to their energy density ***,the severe irreversible phase transition and sluggish Na^(+)diffusion kinetics pose significant challenges to achieve high-performance layered ***,a boron-doped03-type high entropy oxide Na(Fe_(0.2)Co_(0.15)Cu_(0.05)Ni_(0.2)Mn_(0.2)Ti_(0.2))B_(0.02)O_(2)(NFCCNMT-B_(0.02))is designed and the covalent B-O bonds with high entropy configuration ensure a robust layered *** obtained cathode NFCCNMT-B_(0.02)exhibits impressive cycling performance(capacity retention of 95%and 82%after100 cycles and 300 cycles at 1 and 10 C,respectively)and outstanding rate capability(capacity of 83 mAh g^(-1)at 10 C).Furthermore,the NFCCNMT-B_(0.02)demonstrates a superior wide-temperature performance,maintaining the same capacity level(113,4 mAh g^(-1)@-20℃,121 mAh g^(-1)@25℃,and 119 mAh g^(-1)@60℃)and superior cycle stability(90%capacity retention after 100 cycles at 1 C at-20℃).The high-entropy configuration design with boron doping strategy contributes to the excellent sodium-ion storage *** high-entropy configuration design effectively suppresses irreversible phase transitions accompanied by small volume changes(ΔV=0.65 A3).B ions doping expands the Na layer distance and enlarges the P3 phase region,thereby enhancing Na^(+)diffusion *** work offers valuable insights into design of high-performance layered cathodes for sodium-ion batteries operating across a wide temperature.

关键词： High entropy oxide Born substitution Phase transition Na~+diffusion kinetics Sodium-ion batteries

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How water molecules occupying the active site of a single-atom catalyst affect the electrochemical reduction of carbon dioxide

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Nano Research 2023年第7期16卷 9091-9098页

作者： Jia Zhao Di Liu Fenfei Wei Weng Fai Ip Hui Pan Sen Lin State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Institute of Applied Physics and Materials Engineering University of MacaoTaipa 999078MacaoChina Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoTaipa 999078MacaoChina

In single-atom catalysts(SACs),the single atoms are often exposed as protrusions above the *** solvent molecules in the electrocatalytic environment can interact or even bind to these coordination-unsaturated single atoms and thus influence the reaction process,but this has not been studied in *** this work,we systematically investigate the thermodynamics of CO_(2)reduction reaction(CO_(2)RR)to CO over MoS_(2)-supported single metal atom catalysts(TM@MoS_(2),TM=transition metal)under vacuum and explicit solvent environments using density functional *** addition,the ab initio molecular dynamics results show that explicit H_(2)O molecules can coordinate to the TM site and undergo competitive adsorption with the CO_(2)RR intermediates,which significantly affects the energy and conformation of the CO_(2)RR *** structure analysis reveals that the occupying H_(2)O molecules change the electronic state of single atom and further influence the adsorption strength of different CO_(2)RR *** work shows that water molecules can not only act as ligands to influence the electronic state of TM,but also affect the energy and conformation of CO_(2)RR intermediates,which highlights the important role of occupying H_(2)O molecules at the single-atom sites in CO_(2)RR and provides useful insights for the design of SACs for efficient CO_(2)RR.

关键词： electrocatalytic CO_(2)reduction solvent effect single-atom catalysis density functional theory ab initio molecular dynamics

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Removal of encapsulant Ethylene-vinyl acetate (EVA) from solar cells of photovoltaic modules (PVMs) 2nd

Removal of encapsulant Ethylene-vinyl acetate (EVA) from sol...

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2nd International Conference on Management and Recycling of Metallurgical Wastes, MetWaste 2023

作者： Trivedi, Harish Kumar Meshram, Arunabh Gupta, Rajeev Materials Science Programme Indian Institute of Technology Kanpur India Department of Materials Science & Engineering Indian Institute of Technology Kanpur India Department of Physics Indian Institute of Technology Kanpur India

Photovoltaic modules (PVMs) are a very promising way to meet future energy needs. As traditional energy sources aren’t sustainable, the only way to meet future energy needs will be through renewable energy sources. The amount of e-waste expected to generated in the near future is an important concern. Ethylene-vinyl acetate (EVA) encapsulate the solar cell, and this layer must be removed to get to the other materials that can be recycled. EVA can be removed with the help of heat treatment and organic solvents. In this work, the interaction of EVA with different organic solvents was studied. For measuring interaction, the swelling of EVA caused by the organic solvent penetrating and accommodating inside the polymer matrix is considered. The swelling also caused EVA to lose its mechanical strength, making it easy to remove. The reaction of organic solvents with EVA is explained in terms of functional groups of organic solvents. When compared to other solvents, chlorinated hydrocarbons such as trichloroethylene, carbon tetrachloride, chloroform can effectively cause EVA swelling. Furthermore, aromatic hydrocarbons interact well with EVA. Aromatic hydrocarbons are relatively better choice than chlorine-containing hydrocarbon for industrial application based on sustainability of the process. Copyright © 2023 Elsevier Ltd. All rights reserved.

关键词： Polyvinyl acetates

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Tuned d-band states over lanthanum doped nickel oxide for efficient oxygen evolution reaction

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Nano materials science 2023年第2期5卷 228-236页

作者： Ziyi Xiao Wei Zhou Baopeng Yang Chengan Liao Qing Kang Gen Chen Min Liu Xiaohe Liu Renzhi Ma Ning Zhang School of Materials Science and Engineering Central South UniversityChangsha410083HunanChina Department of Applied Physics Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing TechnologySchool of ScienceTianjin UniversityTianjin300072China School of Physical Science and Electronics Central South UniversityChangsha410083HunanChina Institute of Surface Analysis and Chemical Biology University of JinanJinan250022ShandongChina International Center for Materials Nanoarchitectonics(MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki305-0044Japan

The d-band state of materials is an important descriptor for activity of oxygen evolution reaction(OER).For NiO materials,there is rarely concern about tuning their d-band states to tailor the OER ***,NiO nanocrystals with doping small amount of La^(3+)were used to regulate d-band states for promoting OER *** of states calculations based on density functional theory revealed that La^(3+)doping produced upper shift of d-band center,which would induce stronger electronic interaction between surface Ni atoms and species of oxygen evolution reaction *** density functional theory calculation illustrated that La^(3+)doped NiO possessed reduced Gibbs free energy in adsorbing species of OER *** by theoretical calculations,trace La^(3+)was introduced into crystal lattice of NiO *** La^(3+)doped NiO nanocrystal showed much promoted OER activity than corresponding pristine NiO *** electrochemical analysis revealed that La^(3+)doping into NiO increased the intrinsic activity such as improved active sites and reduced charge transfer *** in-situ Raman spectra suggested that NiO phase in La^(3+)doped NiO could be better maintained than pristine NiO during the *** work provides an effective strategy to tune the d-band center of NiO for efficient electrocatalytic OER.

关键词： Nickel oxide Oxygen evolution reaction D-band center Electrocatalysis Water splitting

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Effect of Polymer Network Morphology on the Performance of Polymer Dispersed Liquid Crystal (PDLC) Composite Films

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Journal of Wuhan University of Technology(materials science) 2022年第5期37卷 1020-1024页

作者： SHEN Jiyuan LIN Haonan REN Yunxiao SUN Chang BAO Jinying XIAO Jiumei GAO Yanzi Department of Applied Mechanics University of Sciences and Technology BeijingBeijing100083China Department of Materials Physics and Chemistry School of Materials Science and EngineeringUniversity of Sciences and Technology BeijingBeijing100083China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100083China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and Technology University of Sciences and Technology BeijingBeijing100083China

The effects of the morphologies of liquid crystal (LC) droplets left in polymer network on the performance of polymer dispersed liquid crystal composite films were *** adjusting the relative content range of the crosslinking and diluents,the morphologies of polymer network can be ***,the properties of PDLC composite films with imparity polymer morphologies were obtained by experiments and the finite element *** of the experimental and finite element simulation showed that the electro-optical properties of PDLC composite films were inversely proportional to the domain size of the polymer network and the mechanical properties were proportional to the domain size of the polymer network.

关键词： polymer dispersed liquid crystals polymer network morphology finite element simulation mechanical properties electro-optical properties

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Tuning the number of chiral edge channels in a fixed quantum anomalous Hall system

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Physical Review B 2024年第20期109卷 L201402-L201402页

作者： Peng Deng Yulei Han Peng Zhang Su Kong Chong Zhenhua Qiao Kang L. Wang Beijing Academy of Quantum Information Sciences Beijing 100193 China Department of Electrical and Computer Engineering University of California Los Angeles California 90095 USA Department of Physics Fuzhou University Fuzhou Fujian 350108 China International Center for Quantum Design of Functional Materials CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics and Department of Physics University of Science and Technology of China Anhui 230026 China Hefei National Laboratory University of Science and Technology of China Hefei 230088 China

Quantum anomalous Hall (QAH) insulators exhibit chiral edge channels characterized by vanishing longitudinal conductance and quantized Hall conductance of Ce2/h, wherein the Chern number C is an integer equal to the number of the parallel chiral edge channels. These chiral edge channels conduct dissipationless transport in QAH insulators, making them pivotal for applications in low-consumption electronics and topological quantum computing. While the QAH effect with multiple chiral edge channels (i.e., C > 1) has been demonstrated in multilayers consisting of magnetic topological insulators and normal insulators, the channel number remains fixed for a given sample. Here, we unveil the tunability of the number of chiral edge channels within a single QAH insulator device. By tuning the magnetization of individual layers within the multilayer system, Chern insulating states with different Chern numbers are unveiled. The tunable Chern number was corroborated by our theoretical calculations. Furthermore, we conducted layer-dependent calculations to elucidate the contribution of the Chern number from different layers in the multilayer. Our findings demonstrate an extra degree of freedom in manipulating the chiral edge channels in QAH insulators. This tunability offers an extra dimension for the implementation of the QAH-based multichannel dissipationless transport.

关键词： Quantum anomalous Hall effect Quantum transport Topological insulators Molecular beam epitaxy

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Discovery of carbon-based strongest and hardest amorphous material

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National science Review 2022年第1期9卷 25-35页

作者： Shuangshuang Zhang Zihe Li Kun Luo Julong He Yufei Gao Alexander V.Soldatov Vicente Benavides Kaiyuan Shi Anmin Nie Bin Zhang Wentao Hu Mengdong Ma Yong Liu Bin Wen Guoying Gao Bing Liu Yang Zhang Yu Shu Dongli Yu Xiang-Feng Zhou Zhisheng Zhao Bo Xu Lei Su Guoqiang Yang Olga P.Chernogorova Yongjun Tian Center for High Pressure Science (CHiPS) State Key Laboratory of Metastable Materials Science and Technology Yanshan University Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University Department of Engineering Sciences and Mathematics Lule a University of Technology Department of Physics Harvard University Center for High Pressure Science and Technology Advanced Research Department of Materials Science Saarland University Key Laboratory of Photochemistry Institute of Chemistry University of Chinese Academy of Sciences Baikov Institute of Metallurgy and Materials Science Russian Academy of Sciences

Carbon is one of the most fascinating elements due to its structurally diverse allo tropic forms stemming from its bonding varieties(sp,sp~2 and sp~3).Exploring new forms of carbon has been the eternal theme of scientific ***,we report on amorphous(AM) carbon materials with a high fraction of sp~3 bonding recovered from compression of fullerene C60 under high pressure and high temperature,previously *** of photoluminescence and absorption spectra demonstrates that they are semiconducting with a bandgap range of 1.5-2.2 eV,comparable to that of widely used AM *** mechanical tests demonstrate that synthesized AM-Ⅲ carbon is the hardest and strongest AM material known to date,and can scratch diamond crystal and approach its *** produced AM carbon materials combine outstanding mechanical and electronic properties,and may potentially be used in photovoltaic applications that require ultrahigh strength and wear resistance.

关键词： amorphous carbon ultrahard ultrastrong semiconductor phase transition

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