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The effects of radio frequency atmospheric pressure plasma and thermal treatment on the hydrogenation of TiO_(2) thin film

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Plasma Science and Technology 2023年第6期25卷 72-81页

作者：张宇王昊哲何涛李妍郭颖石建军徐雨张菁 New Energy Materials and Devices College of ScienceDonghua UniversityShanghai 201620People's Republic of China Textile Key Laboratory for Advanced Plasma Technology and Application China National Textile and Apparel CouncilShanghai 201620People's Republic of China Magnetic Confinement Fusion Research Center Ministry of EducationShanghai 201620People's Republic of China

The effects of radio frequency(RF)atmospheric pressure(AP)He/H_(2)plasma and thermal treatment on the hydrogenation of TiO_(2)thin films were investigated and compared in this *** color of the original TiO_(2)film changes from white to black after being hydrogenated in He/H_(2)plasma at160 W(gas temperature~381℃)within 5 min,while the color of the thermally treated TiO_(2)film did not change significantly even in pure H_(2)or He/H_(2)atmosphere with higher temperature(470℃)and longer time(30 min).This indicated that a more effective hydrogenation reaction happened through RF AP He/H_(2)plasma treatment than through pure H_(2)or He/H_(2)thermal *** color change of TiO_(2)film was measured based on the Commission Internationale d’Eclairage L*a*b*color space *** TiO_(2)film displayed improved visible light absorption with increased plasma *** morphology of the cauliflower-like nanoparticles of the TiO_(2)film surface remained unchanged after plasma processing.X-ray photoelectron spectroscopy results showed that the contents of Ti3+species and Ti-OH bonds in the plasma-hydrogenated black TiO_(2)increased compared with those in the thermally treated TiO_(2).X-ray diffraction(XRD)patterns and Raman spectra indicated that plasma would destroy the crystal structure of the TiO_(2)surface layer,while thermal annealing would increase the overall *** different trends of XRD and Raman spectra results suggested that plasma modification on the TiO_(2)surface layer is more drastic than on its inner layer,which was also consistent with transmission electron microscopy *** emission spectra results suggest that numerous active species were generated during RF AP He/H_(2)plasma processing,while there were no peaks detected from thermal processing.A possible mechanism for the TiO_(2)hydrogenation process by plasma has been *** active species were generated in the bulk plasma region,accelerated in the sheath reg

关键词： black TiO_(2)thin film atmospheric pressure plasma thermal treatment visible light response hydrogenation

In situ preparation of visible-light-driven carbon quantum dots/NaBiO3 hybrid materials for the photoreduction of Cr(Ⅵ)

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Journal of Environmental Sciences 2021年第1期33卷 100-109页

作者： Yixiao Wu Chunlong Chen Shu He Xuesong Zhao Shaobin Huang Gongchang Zeng Yingying You Ying Cao Lishan Niu School of Environment and Energy South China University of TechnologyHigher Education Mega CenterGuangzhou 510006China Qiannan Normal University for Nationalities Duyun 558000China Physical Sciences Division Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA 99354USA Department of Chemical Engineering University of WashingtonSeattleWA 98101USA School of Enuironment Higher Education Mega CenterHarbin Institute of TechnologyHarbin 150000China

In this study,different carbon quantum dots(CQDs)/NaBiO3 hybrid materials were synthesized as photocatalysts to effectively utilize visible light for the photocatalytic degradation of contaminants *** hybrid materials exhibit an enhanced photocatalytic reduction of hexavalent chromium(Cr(Ⅵ))in the aqueous ***-dimensional nanoparticles of CQDs were embedded within the two-dimensional NaBiO3 nanosheets by the hydrothermal *** with that of the pure NaBiO3 nanosheets,the photocatalytic performance of the hybrid catalysts was significantly high and 6 wt.%CQDs/NaBiO3 catalyst exhibited better photocatalytic *** performed the first-principles density functional theory calculations to study the interfacial properties of pure NaBiO3 nanosheets and hybrid photocatalysts,and confirmed the CQDs played an important role in the CQDs/NaBiO3 *** experimental results indicated that the enhanced reduction of Cr(Ⅵ)was probably due to the high loading of CQDs(electron acceptor)on NaBiO3,which made NaBiO3 nanomaterials to respond in visible light and significantly improved their electron-hole separation efficiency.

关键词： Carbon quantum dots/NaBiO3 Hybrid materials visible light response Cr(Ⅵ)reduction

Preparation and Photostriction Properties of BiFeO_(3)-BaTiO_(3)Ceramics

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1079-1086页

作者： ZHENG Zewei ZHANG Liqiang CHEN Chen CAO Minghe YI Zhiguo LIU Hanxing School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Microelectronics Shanghai UniversityShanghai 200444China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Under illumination by 405,520 and 655 nm monochromatic visible light(light intensity of 30 kW/m^(2)),large photostriction(ΔL/L)of 0.19%,0.13%and 0.26%for 67BiFeO_(3)-33BaTiO_(3)(67BF-33BT)lead-free ferroelectric ceramics are obtained,*** studying the ferroelectric and photoelectric properties in conjunction with in situ Raman spectroscopy,it is found that the photostrictive effect of 67BF-33BT is not caused by the electrical strain induced by abnormal photovoltaic voltage,but related to the optical induced oxygen octahedral *** 67BF-33BT lead-free ferroelectric material with excellent photostrictive response in the visible light region is expected to play an important role in the field of optical drive electromechanical devices.

关键词： ferroelectric ceramics photostrictive effect visible light response

Template-free large-scale synthesis of g-C3N4 microtubes for enhanced visible light-driven photocatalytic H2 production

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Nano Research 2018年第6期11卷 3462-3468页

作者： Chao Zhou Run Shi Lu Shang Li-Zhu Wu Chen-Ho Tung Tierui Zhang Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

A template-free hydrothermal-assisted thermal polymerization method has been developed for the large-scale synthesis of one-dimensional （1D） graphitic carbon nitride （g-C3N4） microtubes. The g-C3N4 microtubes were obtained by simple thermal polymerization of melamine-cyanuric acid complex microrods under N2 atmosphere, which were synthesized by hydrothermal treatment of melamine solution at 180℃ for 24 h. The as-obtained g-C3N4 microtubes exhibited a large surface area and a unique one-dimensional tubular structure, which provided abundant active sites for proton reduction and also facilitated the electron transfer processes. As such, the g-C3N4 microtubes showed enhanced photocatalytic H2 production activity in lactic acid aqueous solutions under visible light irradiation （A 〉 420 nm）, which was - 3.1 times higher than that of bulk g-C3N4 prepared by direct thermal polymerization of the melamine precursor under the same calcination conditions.

关键词： graphitic carbon nitride(g-C3N4)microtubes photocatalytic water splitting visible light response

visible light and Temperature Regulated Reflection Colors in Self-supporting Cholesteric Liquid Crystal Physical Gels

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Chinese Journal of Polymer Science 2021年第12期39卷 1617-1625页

作者： Dong-Xu Zhao Qian Jiang Jing Wang Yuan Qiu Yong-Gui Liao Xiao-Lin Xie Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsHubei Key Laboratory of Materials Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

Photo-responsive cholesteric liquid crystals(CLCs)have attracted much attention in recent years due to their wide applications in filters,tun able optical lasers,dyn amic display devices,***,UV light is usually used as the exter nal stimulus source,which is not envir on ment-frie ndly *** the other hand,the mecha nical properties of CLCs are not strong eno ugh for these practical ***,it still remains a challenge to endow the CLCs with visible light response and high mechanical properties at the same ***,an axially chiral tetra-fluorinated binaphthyl azobenzene gelator(S-4F-AG)is *** 550 and 450 nm light irradiations,S-4F-AG exhibits excellent photo-switchable ***,the maximum con tent of c/s-isomer and its half-life are as high as 35%and 89 h in acet on itrile,respectively.A self-supporting CLC physical gel with a storage modulus around 104 Pa can be obtained when 3wt%S-4F-AG and 12wt%binaphthyl azobenzene derivative(dopant 2)are co-doped into a nematic LC host *** CLC physical gel exhibits a temperature-driven blue,green,and red reflection colors ***,such three primary RGB colors can also be realized by adjusting the exposure time of 550 nm green *** work lays a solid foundation for the applications ranging from information storage to high-tech anticounterfeit.

关键词： Cholesteric liquid crystal Gel visible light response Reflect!on color Self-supporting ability

Photocatalytic degradation of tetracycline hydrochloride with visible light-responsive bismuth tungstate/conjugated microporous polymer

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Chinese Journal of Chemical Engineering 2022年第1期35卷 488-496页

作者： Fenghongkang Pan Yimeng Wang Kaiqing Zhao Jun Hu Honglai Liu Ying Hu State Key Laboratory of Chemical Engineering and School of Chemistry&Molecular Engineering East China University of Science and TechnologyShanghai 200237China Prinbury Biopharm Co. LtdShanghai 201203China

Conjugated microporous polymer(CMP)is an emerging organic semiconductor withπ-conjugated skeletons,and the bandgap of CMP can be flexibly modulated to harvest visible *** on the diversity and adjustability of monomers in CMP,we designed and synthesized donor-accepter(D-A)type BTNCMP through Sonogashira-Hagihara cross-coupling polymerization,further in-situ constructing series of inorganic/organic Z-scheme BW/BTN-n composite in the presence of Bi_(2)WO_(6).After optimization,the tetracycline hydrochloride(C0=10 mg·L^(-1))degradation efficiency reached 84%with BW/BTN-2 as catalyst in 90 min under visible light irradiation,the apparent rate constant k1 is 0.017 min^(-1),which is 1.7 and 5.7 times higher than bare Bi_(2)WO_(6) and BTN-CMP.X-ray photoelectron spectra and UV-Vis diffuse spectra showed that the enhanced photocatalytic activity originated from the tight heterojunction between Bi_(2)WO_(6) and BTN-CMP,which can extend the light absorption range and facilitate the separation and transport of photogenerated charges in the interface of *** active species trapping experiments and electron spin resonance technique revealed that h+was the dominant active species during the photodegradation process of tetracycline hydrochloride(TCH).The present study demonstrated the feasibility to construct inorganic/organic composite for the photocatalytic degradation of environmental pollutants.

关键词： Photochemistry Degradation visible light response Pollution Inorganic/organic heterojunction composite

Smart adsorbents for CO2 capture:Making strong adsorption sites respond to visible light

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Science China Materials 2021年第2期64卷 383-392页

作者： Qiu-Rong Wu Peng Tan Chen Gu Rui Zhou Shi-Chao Qi Xiao-Qin Liu Yao Jiang Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced MaterialsCollege of Chemical EngineeringNanjing Tech UniversityNanjing211816China

Due to the good controllability and high energy efficiency in adsorption processes,photoresponsive adsorbents are intriguing for CO2 ***,most reported photoresponsive adsorbents are designed based on weak adsorption sites,regulating CO2 adsorption through structural change or steric *** addition,ultraviolet(UV)light is commonly involved in the regulation of adsorption *** we report for the first time the smart adsorbents for CO2 capture,which makes strong adsorption sites respond to visible(Vis)*** adsorbents were fabricated by introducing primary amine and Dispersed Red 1(DR1,a kind of push-pull azobenzene that responds to Vis light rapidly)units to mesoporous silica,which act as strong adsorption sites and triggers,*** primary amine sites make the adsorbents highly selective in the adsorption of CO2 over *** light irradiation,azobenzene is in the form of trans configuration,which leads to decreased electrostatic potential of primary amines and subsequently,exposure of active sites and liberal adsorption of *** Vis-light irradiation,cis isomers are formed,which results in increased electrostatic potential of primary amines and subsequently shelter of active *** on such strong adsorption sites,the alteration of CO2 adsorption capacity can reach 40%for the adsorbent with and without Vis-light ***,the trans/cis isomerization of DR1 units can be triggered reversibly by Vis *** present smart system endows adsorbents with selective adsorption capacity and avoids the employment of UV light,which is unlikely to be achieved by conventional photoresponsive adsorbents.

关键词： CO2 adsorption strong adsorption sites selective adsorption push-pull azobenzene visible light response