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Ti_(3)C_(2)T_(x)/SnO_(2)P–N heterostructure construction boosts room-temperature detecting formaldehyde

Rare Metals 2024年第1期43卷 267-279页

作者： Yue Zhang Ming-Yue Wang Xiao-Guang San Yan-Bai Shen Guo-Sheng Wang Lei Zhang Dan Meng College of Chemical Engineering Shenyang University of Chemical TechnologyShenyang 110142China Institute for Superconducting and Electronic Materials(ISEM) Australian Institute for Innovative Materials(AIIM)University ofWollongongWollongongNSW2500Australia College of Resources and Civil Engineering Northeastern UniversityShenyang 110819China

Formaldehyde is a common atmospheric pollutant produced in industrial production and daily ***,the traditional semiconductor formaldehyde gas sensor cannot work at room temperature,which limits its practical ***,developing high-performance gas sensors for rapidly and accurately detecting formaldehyde at room temperature is an important *** this study,Ti_(3)C_(2)Tx/SnO_(2)heterostructures were constructed,which could selectively detect formaldehyde at room temperature with a response value of 29.16%(10×10^(-6)).In addition,the sensor shows a remarkable theoretical detection limit of 5.09×10^(-9)and good longterm *** functional theory(DFT)simulations reveal that SnO_(2)nano spheres provide the majority of adsorption sites that strongly interact with ***,Ti_(3)C_(2)T_(x)acting as a conductive layer facilitates the transfer of charge carriers so that they show a sensing response to formaldehyde at room ***,the formation of p-n heterostructures between SnO_(2)and Ti_(3)C_(2)T_(x)boosts the Schottky barrier at the interface,which is the critical factor in enhancing the sensing properties by turning the Schottky barrier upon introducing formaldehyde *** perspective is expected to provide instructive guidance for utilizing MXene/metal oxide nanocomposites to improve the gas sensing performance at room temperature.

关键词： Ti_(3)C_(2)T_(x)/SnO_(2)nanocomposites p-n heterostructures Formaldehyde sensing room temperature DFT calculations

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room temperature non-balanced electric bridge ethanol gas sensor based on a single ZnO microwire

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Chinese Physics B 2020年第1期29卷 463-468页

作者： Yun-Zheng Li Qiu-Ju Feng Bo Shi Chong Gao De-Yu Wang Hong-Wei Liang School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029China School of Microelectronics Dalian University of TechnologyDalian 116024China

In this paper,ultra-long and large-scaled ZnO microwire arrays are grown by the chemical vapor deposition method,and a single ZnO microwire-based non-balanced electric bridge ethanol gas sensor is *** experimental results show that the gas sensor has good repeatability,high response rate,short response,and recovery time at room temperature(25℃).The response rate of the gas sensor exposed to 90-ppm ethanol is about 93%,with a response time and recovery time are 0.3 s and 0.7 s *** a contrast,the traditional resistive gas sensor of a single ZnO microwire shows very small gas response ***,ethanol gas sensor based on non-balanced electric bridge can obviously enhance gas sensing characteristics,which provides a feasible method of developing the high performance ZnO-based gas sensor.

关键词： ZnO microwire gas sensor room temperature ethanol

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room temperature Growth of Hydrogenated Amorphous Silicon Films by Dielectric Barrier Discharge Enhanced CVD

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Plasma Science and Technology 2007年第2期9卷 177-180页

作者：郭玉张溪文韩高荣 Department of Materials Science and Engineering Silicon State Key Lab.Zhejiang UniversityHangzhou 310027China

Hydrogenated amorphous silicon （a-Si： H） films were deposited on Si （100） and glass substrates by dielectric barrier discharge enhanced chemical vapour deposition （DBD-CVD） in （SiH4＋H2） atmosphere at room temperature. Results of the thickness measurement, SEM （scanning electron microscope）, Raman, and FTIR （Fourier transform infrared spectroscopy） show that with the increase in the applied peak voltage, the deposition rate and network order of the films increase, and the hydrogen bonding configurations mainly in di-hydrogen （Si-H2） and poly hydrogen （SiH2）n are introduced into the films. The UV-visible transmission spectra show that with the decrease in SiH4/ （SiHn＋H2） the thin films＇ band gap shifts from 1.92 eV to 2.17 eV. These experimental results are in agreement with the theoretic analysis of the DBD discharge. The deposition of a-Si： H films by the DBD-CVD method as reported here for the first time is attractive because it allows fast deposition of a-Si： H films on large-area low-melting-point substrates and requires only a low cost of production without additional heating or pumping equipment.

关键词： DBD-CVD room temperature hydrogenated amorphous silicon films

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room temperature Modulated Structure of Ca and K co-Doped LaMnO_3

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Chemical Research in Chinese Universities 2012年第5期28卷 784-787页

作者： HOU Chang-min HUANG Ke-ke HU Bin YUAN Hong-ming FENG Shou-hua State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangehun 130012R R.China

A series of perovskite compounds of La1-x-yCaxKyMnO3 was prepared by hydrothermal disproportionation reaction of MnO2. The three oxidation states of manganese（Mn3＋, Mn4＋ and Mn5＋） can stably exist in the compounds. Under room temperature conditions, twice and three times modulated structure produced by the charge ordering can be observed by X-ray diffraction（XRD）, select area electron diffraction（SAED） and high resolution transmission electron microscopy（HR-TEM）. The splits of the diffraction peaks of the single crystals confirmed by synchrotron X-ray diffraction experiment are in accordance with those of the powder sample. The existence of the different oxidation states of Mn3＋, Mn4＋ and Mn5＋ can be considered to be the dominating reason of the complicated room temperature modulated structure.

关键词： Modulated structure Mixed valence state room temperature

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Probing reaction pathways for H_(2)O-mediated HCHO photooxidation at room temperature

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Nano Research 2021年第5期14卷 1471-1478页

作者： Weiwei Shao Xiaodong Li Xiaolong Zu Liang Liang Yang Pan Junfa Zhu Chengming Wang Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale National Synchrotron Radiation LaboratoryHefei Science Center of CASUniversity of Science and Technology of ChinaHefei230026China Institute of Energy Hefei Comprehensive National Science CenterHefei230031China

Photooxidation provides a promising strategy for removing the dominant indoor pollutant of HCHO,while the underlying photooxidation mechanism is still unclear,especially the exact role of H2O ***,we utilize in-situ spectral techniques to unveil the H2O-mediated HCHO photooxidation *** an example,the synthetic defective Bi2WO6 ultrathin sheets realize high-rate HCHO photooxidation with the assistance of H2O at room ***-situ electron paramagnetic resonance spectroscopy demonstrates the existence of•OH radicals,possibly stemmed from H2O oxidation by the photoexcited ***-radiation vacuum ultraviolet photoionization mass spectroscopy and H218O isotope-labeling experiment directly evidence the formed•OH radicals as the source of oxygen atoms,trigger HCHO photooxidation to produce CO2,while in-situ Fourier transform infrared spectroscopy discloses the HCOO*radical is the main photooxidation ***-functional-theory calculations further reveal the•OH formation process is the rate-limiting step,strongly verifying the critical role of H2O in promoting HCHO *** work first clearly uncovers the H2O-mediated HCHO photooxidation mechanism,holding promise for high-efficiency indoor HCHO removal at ambient conditions.

关键词： mechanistic study H_(2)O-mediated HCHO photooxidation room temperature

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Gas-discharge induced flash sintering of YSZ ceramics at room temperature

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Journal of Advanced Ceramics 2022年第4期11卷 603-614页

作者： Yuchen ZHU Hongyang ZHOU Rongxia HUANG Nianping YAN Xilin WANG Guanghua LIU Zhidong JIA Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environments Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China State Grade Jiangxi Electric Power Research Institute Nanchang 330000China State Key Laboratory of New Ceramics and Fine Processing Tsinghua University School of Materials Science and TechnologyTsinghua UniversityBeijing 100084China

This is the first study to conduct the flash sintering of 3 mol%yttria-stabilized zirconia(3YSZ)ceramics at room temperature(25℃)under a strong electric field,larger than 1 kV/*** the standard atmospheric pressure(101 kPa),the probability of successful sintering is approximately half of that at low atmospheric pressure,lower than 80 *** success of the proposed flash sintering process was determined based on the high electric arc performance at different atmospheric pressures ranging from 20 to 100 *** 3YSZ samples achieved a maximum relative density of 99.5%with a grain size of~200 *** results showed that as the atmospheric pressure decreases,the onset electric field of flash sintering decreases,corresponding to the empirical formula of the flashover ***,flash sintering was found to be triggered by the surface flashover of ceramic samples,and the electric arc on the sample surfaces floated upward before complete flash sintering at overly high pressures,resulting in the failure of flash *** study reveals a new method for the facile preparation of flash-sintered ceramics at room temperature,which will promote the application of flash sintering in the ceramic industry.

关键词： flash sintering yttria-stabilized zirconia(YSZ) room temperature flashover AC field low atmospheric pressure

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N/Ce doped graphene supported Pt nanoparticles for the catalytic oxidation of formaldehyde at room temperature

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Journal of Environmental Sciences 2023年第3期125卷 135-147页

作者： Yaodong Guo Zhaoying Di Xiaonan Guo Ying Wei Runduo Zhang Jingbo Jia State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Energy Environmental CatalysisBeijing University of Chemical TechnologyBeijing 100029China

Pt catalysts with nitrogen-doped graphene oxide (GO) as support and CeO_(2)as promoter were prepared by impregnation method,and their catalytic oxidation of formaldehyde (HCHO) at room temperature was *** Pt-CeO_(2)/N-rGO (reduced GO) with a mass fraction of 0.7% Pt and 0.8%CeO_(2)exhibited an excellent catalytic performance with the 100% conversion of HCHO at room *** characterization demonstrated that nitrogendoping greatly increased the defect degree and the specific surface area of GO,enhanced the dispersion of Pt and promoted more zero-valent *** synergistic effect between CeO_(2)and Pt was also beneficial to the dispersion of ***-doping promoted the production of more Ce3+ions,generating more oxygen vacancies,which was conducive to O_(2)*** a result,the catalyst exhibited enhanced redox properties,leading to the best catalytic ***,an attempt to propose the reaction mechanism of HCHO oxidation has been made.

关键词： Formaldehyde N-doped graphene oxide Pt catalyst room temperature

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In-situ fabrication of ZnO nanoparticles sensors based on gas-sensing electrode for ppb-level H_(2)S detection at room temperature

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Chinese Physics B 2021年第2期30卷 250-256页

作者： Jing-Yue Xuan Guo-Dong Zhao Xiao-Bo Shi Wei Geng Heng-Zheng Li Mei-Ling Sun Fu-Chao Jia Shu-Gang Tan Guang-Chao Yin Bo Liu Laboratory of Functional Molecular and Materials School of Physics and Optoelectronic EngineeringShandong University of TechnologyZibo 255000China Institute of Artificial Intelligence Henan Finance UniversityZhengzhou 450046China

The zinc oxide(ZnO)nanoparticles(NPs)sensors were prepared in-situ on the gas-sensing electrodes by a one-step simple sol-gel method for the detection of hydrogen sulfide(H_(2)S)*** sphere-like ZnO NPs were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),x-ray diffraction(XRD),energy dispersive x-ray analysis(EDX),and their H_(2)S sensing performance were measured at room *** results indicate that the ZnO NPs exhibit excellent response to H_(2)S gas at room *** response value of the optimal sample to750 ppb H_(2)S is 73.3%,the detection limit reaches to 30 ppb,and the response value is 7.5%.Furthermore,the effects of the calcining time and thickness of the film on the gas-sensing performance were *** calcining time and film thickness show a negative correlation with the H_(2)S sensing *** corresponding reaction mechanism of H_(2)S detection was also discussed.

关键词： ZnO H_(2)S gas sensor room temperature

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Efficient Knoevenagel condensation catalyzed by imidazole-based halogenfree deep eutectic solvent at room temperature

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Green Energy & Environment 2020年第2期5卷 124-129页

作者： Hao Qin Yishan Zhou Qian Zeng Hongye Cheng Lifang Chen Bingjian Zhang Zhiwen Qi Max Planck Partner Group at the State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and Technology130 Meilong RoadShanghai200237China School of Chemical Engineering and Technology Sun Yat-Sen University135 Xingang West RoadGuangzhou510275China

For the first time,we employed the halogen-free deep eutectic solvent(DES)into the Knoevenagel condensation between aromatic aldehydes and active methylene compounds at room *** DESs[3Im:PTSA]and[4Im:PTSA]were prepared by imidazole(Im)and p-tol-uenesulfonic acid(PTSA),which were experimentally screened from a series of organic acids with imidazole.a,b-Unsaturated carbonyl compounds were obtained in good to excellent yields under solvent-free conditions with fast reaction *** two DESs can be reused for multiple times with no loss of catalytic activity.

关键词： Halogen-free DES Knoevenagel condensation room temperature Recyclable catalyst Solvent-free condition

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Si nanopillar arrays with nanocrystals produced by template-induced growth at room temperature

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Chinese Physics B 2011年第11期20卷 391-396页

作者：白安琪郑军陶冶了左玉华薛春来成步文王启明 State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences

Well-aligned and closely-packed silicon nanopillar （SNP） arrays are fabricated by using a simple method with magnetron sputtering of Si on a porous anodic alumina （PAA） template at room temperature. The SNPs are formed by selective growth on the top of the PAA pore walls. The growth mechanism analysis indicates that the structure of the SNPs can be modulated by the pore spacing of the PAA and the sputtering process and is independent of the wall width of the PAA. Moreover, nanocrystals are identified by using transmission electron microscopy in the as-deposited SNP samples, which are related to the heat isolation structure of the SNPs. The Raman focus depth profile reveals a high crystallization ratio on the surface.

关键词： silicon nanopillar arrays porous anodic alumina nanocrystal room temperature

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