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international Journal of Coal Science & Technology 2020年第3期7卷 422-432页

作者： Peng Jiang Yang Meng Ziyao Lu lan Xu Gang Yang Xiang Luo Kaiqi Shi Tao Wu department of Chemical and Environmental engineering The University of Nottingham Ningbo ChinaNingbo315100China Key Laboratory for Carbonaceous Wastes Processing and Process intensification Research of Zhejiang Province The University of Nottingham Ningbo ChinaNingbo315100China

This study examined an isothermal CO2 gasification of four chars prepared via two different methods,i.e.,conventional and microwave-assisted pyrolysis,by the approach of thermogravimetric ***,chemical,and structural behaviours of chars were examined using ultimate analysis,X-ray diffraction,and scanning electronic *** parameters were calculated by applying the shrinking unreacted core(SCM)and random pore(RPM)***,char-CO2 gasification was further simulated by using Aspen Plus to investigate thermodynamic performances in terms of syngas composition and cold gas efficiency(CGE).The microwave-induced char has the largest C/H mass ratio and most ordered carbon structure,but the smallest gasification *** analysis indicates that the RPM is better for describing both gasification conversion and reaction rates of the studied chars,and the activation energies and pre-exponential factors varied in the range of 78.45–194.72 kJ/mol and 3.15–102,231.99 s−1,*** addition,a compensation effect was noted during ***,the microwave-derived char exhibits better thermodynamic performances than the conventional chars,with the highest CGE and CO molar concentration of 1.30%and 86.18%,*** the pyrolysis temperature,gasification temperature,and CO2-to-carbon molar ratio improved the CGE.

关键词： Coal char CO2 gasification Microwave pyrolysis Char properties Kinetics Thermodynamic

implications of Nitrogen Doping on Geometrical and electronic Structure of the Fullerene Dimers

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Chinese Journal of Chemistry 2021年第1期39卷 93-98页

作者： Yin Su Zuo-Chang Chen Han-Rui Tian Yun-Yan Xu Qianyan Zhang Su-Yuan Xie lan-Sun Zheng State Key Lab for Physical Chemistry of Solid Surfaces iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China

Because of its unsaturated bonds,C_(60) is susceptible to polymerize into *** implications of nitrogen doping on the geometrical and electronic structure of C_(60) dimers have been ambiguous for years.A quarter-centur... 详细信息

关键词： Fullerenes Dimers Structure elucidation Density functional calculations Crystallographic structure

Large area van der Waals epitaxy of ii-Vi CdSe thin films for flexible optoelectronics and full-color imaging

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Nano Research 2022年第1期15卷 368-376页

作者： Wenwu Pan Junliang Liu Zekai Zhang Renjie Gu Alexandra Suvorova Sarah Gain Han Wang Ziyuan Li lan Fu Lorenzo Faraone Wen Lei department of Electrical Electronic and Computer EngineeringThe University of Western Australia35 Stirling HighwayCrawley 6009Australia Centre for Microscopy Characterisation and AnalysisThe University of Western Australia35 Stirling HighwayPerth 6009Australia department of electronic Materials engineering Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia

The demand for future semiconductor devices with enhanced performance and lower cost has driven the development of epitaxial growth of high quality,free-standing semiconductor thin film materials without the requirement of lattice matching to the substrate,as well as their transfer to other substrates and associated device processing *** work presents a study on the van der Waals epitaxy based molecular beam epitaxy of CdSe thin films on two-dimensional layered mica substrates,as well as related etch-free layer transfer technology of large area,free-standing layers and their application in flexible photodetectors for full-color *** photoconductor detectors based on these flexible CdSe thin films demonstrate excellent device performance at room temperature in terms of responsivity(0.2 A·W^(-1))and detectivity(1.5×10^(12)Jones),leading to excellent full-color imaging quality in the visible spectral *** etch-free and damage-free layer transfer method has been developed for transferring these CdSe thin films from mica to other substrate for further device processing and *** results demonstrate the feasibility of van der Waals epitaxy method for growing high quality,large area,and free-standing epitaxial layers without the requirement for lattice matching to substrate for applications in low-cost flexible and/or monolithic integrated optoelectronic devices.

关键词： CdSe flexible devices van der Waals epitaxy molecular beam epitaxy layer lift-off

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多元固废基胶凝体系固化盐渍土的力学性能

中国粉体技术 2024年第5期30卷 57-69页

作者：王紫周志尧张喆兰永军孟松松李宏波宁夏大学土木与水利工程学院宁夏银川750021 宁夏大学宁夏土木工程防震减灾工程技术研究中心宁夏银川750021 宁夏大学宁夏节水灌溉与水资源调控工程技术研究中心土木与水利工程学院宁夏银川750021 谢菲尔德大学土木与结构工程系英国南约克郡S102TN

【目的】改善宁夏地区工程盐渍土地基的冻胀和腐蚀问题。【方法】采用水泥、粉煤灰、硅灰和硅锰渣作为盐渍土的固化剂,设计四因素三水平正交试验方案,通过无侧限抗压强度试验和三轴试验,探讨不同固化剂掺量(质量分数,下同)对盐渍土抗压... 详细信息

【目的】改善宁夏地区工程盐渍土地基的冻胀和腐蚀问题。【方法】采用水泥、粉煤灰、硅灰和硅锰渣作为盐渍土的固化剂,设计四因素三水平正交试验方案,通过无侧限抗压强度试验和三轴试验,探讨不同固化剂掺量(质量分数,下同)对盐渍土抗压强度和抗剪强度的影响;采用扫描电子显微镜(scanning electronic microscopy,SEM)和X射线衍射(X‐ray diffraction,XRD)表征分析固化盐渍土的强度提升机制。【结果】水泥和硅灰提升固化盐渍土的早期强度作用较为显著,随掺量的增加,粉煤灰强度呈先增后减的趋势,硅锰渣结构较为稳定,需要充足的碱性环境来激发胶凝能力;水泥、粉煤灰、硅灰和硅锰渣4种因素对固化盐渍土抗压强度的影响程度由高到低的顺序为水泥、硅灰、粉煤灰、硅锰渣;水泥、粉煤灰、硅灰和硅锰渣掺量分别为3%、5%、5%和3%时固化效果最佳,为最佳配合比;固化盐渍土生成棒状的钙矾石(aluminate ferro-copper-calcium sulfate,AFt)和网状的水化铝酸钙(calcium aluminate hydrate,C-A-H)等水化产物相互联结,微观结构变得致密。协同作用提升了固化盐渍土的强度。【结论】采用水泥、粉煤灰、硅灰和硅锰渣最佳配合比能够使盐渍土地基固化,改善地基的冻胀和腐蚀问题。

关键词：固化盐渍土无侧限抗压强度试验三轴试验微观分析

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Wafer-scale synthesis of monolayer WS2 for high-performance flexible photodetectors by enhanced chemical vapor deposition

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Nano Research 2018年第6期11卷 3371-3384页

作者： Changyong lan Ziyao Zhou Zhifei Zhou Chun Li Lei Shu Lifan Shen Dapan Li Ruoting Dong SenPo Yip Johnny C. Ho department of Materials Science and engineering City University of Hong Kong Hong Kong 999077 China School of Optoelectronic information University of Electronic Science and Technology of China Chengdu 610054 China Shenzhen Research institute City University of Hong Kong Shenzhen 518057 China State Key Laboratory of Millimeter Waves City University of Hong Kong Kowloon Hong Kong 999077 China Centre for Functional Photonics City University of Hong Kong Kowloon Hong Kong 999077 China

Two-dimensional （2D） nanomaterials have recently attracted considerable attention due to their promising applications in next-generation electronics and optoelectronics. in particular, the large-scale synthesis of high-quality 2D materials is an essential requirement for their practical applications. Herein, we demonstrate the wafer-scale synthesis of highly crystalline and homogeneous monolayer WS2 by an enhanced chemical vapor deposition （CVD） approach, in which precise control of the precursor vapor pressure can be effectively achieved in a multi-temperature zone horizontal furnace. in contrast to conventional synthesis methods, the obtained monolayer WS2 has excellent uniformity both in terms of crystallinity and morphology across the entire substrate wafer grown （e.g., 2 inches in diameter）, as corroborated by the detailed characterization. When incorporated in typical rigid photodetectors, the monolayer WS2 leads to a respectable photodetection performance, with a responsivity of 0.52 mA/W, a detectivity of 4.9 × 10^9 Jones, and a fast response speed （〈 560μs）. Moreover, once fabricated as flexible photodetectors on polyimide, the monolayer WS2 leads to a responsivity of up to 5 mA/W. importantly, the photocurrent maintains 89% of its initial value even after 3,000 bending cycles. These results highlight the versatility of the present technique, which allows its applications in larger substrates, as well as the excellent mechanical flexibility and robustness of the CVD-grown, homogenous WS2 monolayers, which can promote the development of advanced flexible optoelectronic devices.

关键词： wafer-scale WS2 monolayer chemical vapor deposition flexible optoelectronics

Highly efficient nanoporous CoBP electrocatalyst for hydrogen evolution reaction

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Rare Metals 2021年第5期40卷 1031-1039页

作者： Hui-lan Guang Sheng-Li Zhu Yan-Qin Liang Shui-Lin Wu Zhao-Yang Li Shui-Yuan Luo Zhen-Duo Cui Akihisa inoue School of Materials Science and engineering Tianjin UniversityTianjin 300350China School of Materials Science and engineering Lanzhou Jiaotong UniversityLanzhou 730070China College of Chemistry engineering and Materials Science Quanzhou Normal UniversityQuanzhou 362000China international institute of Green Materials Josai International UniversityTogane 283-8555Japan department of Physics King Abdulaziz UniversityJeddah 22254Saudi Arabia

Water splitting is an environment friendly and efficient way to produce *** efficient and low-cost non-noble metal catalysts play an important role in hydrogen evolution reaction(HER).Dealloying is a simple method to prepare three-dimensional self-supporting nanoporous materials without conductive supports and *** this work,we prepared self-supporting nanoporous CoBP electrocatalyst by dealloying *** influence of the synergistic effect of nonmetallic elements on catalytic activity was *** synergistic electronic effect of Co,B and P atoms on the surface optimizes the H atoms desorption and results in superior HER *** bi-continuous structure of nanoporous CoBP provides more active area and favors of electron and electrolyte *** nanoporous CoBP with the B/P atomic ratio of 1/3 exhibits low overpotential of 42 mV at 10 mA·cm^(-2),small Tafel slope of 39.8 mV·dec-1 and good long-term stability with no performance decrease for 20 h in alkaline solution.

关键词： Hydrogen evolution reaction Nanoporous Self-supporting electrocatalyst Co-B-P alloy Dealloying

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Light-activated nitric-oxide overproduction theranostic nanoplatform based on long-circulating biomimetic nanoerythrocyte for enhanced cancer gas therapy

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Science china Chemistry 2021年第10期64卷 1796-1810页

作者： Cheng-Guang Wu Jing-lan Liang Xiang Wang Xiaoyan Zhou Xiang Cai Jun Xu Meng Wang Wen-Bo Wang Dong Ma Wei Xue Guangdong Provincial engineering and Technological Research Center for Drug Carrier Development Department of Biomedical EngineeringJinan UniversityGuangzhou 510632China institute of Medicine and Health Guangdong Academy of SciencesNational Engineering Research Center for Healthcare DevicesGuangdong Key Lab of Medical Electronic Instruments and Polymer Material ProductsGuangdong Institute of Medical InstrumentsGuangzhou 510500China department of Lighl Chemical engineering Guangdong PolytechnicFoshan 528041China department of Critical Care Medicine First Affiliated HospitalJinan UniversityGuangzhou 510632China MOE Key Laboratory of Tumor Molecular Biology Jinan UniversityGuangzhou 510632China

The limited intratumoral perfusion of nitric oxide(NO)-carrying nanoparticles into solid tumors caused by the inherent biological barriers in vivo greatly attenuates their generated efficacy. Herein, through entrapping heat-sensitive NO donors(BNN6)on mesoporous polydopamine nanoparticles(M-PDA) and subsequently enveloping with red blood cells membranes, a heatresponsive biomimetic theranostic nanoerythrocyte(M/B@R) is developed to boost NO-based cancer therapy. The reserved intact structure of red blood cells membranes(RBCm) endows M/B@R with superior biosafety and stealth properties for prolonged circulation time and subsequent enhanced tumor accumulation. Once internalized in tumors and excited by nearinfrared light(NiR, 808 nm) irradiation, M/B@R can not only yield plenty of heat for photothermal therapy(PTT) but also achieve the overproduction of NO for highly-efficient NO gas therapy due to its high loading capacity and NiR-absorbing property of M-PDA. The generated NO further ensures the formation of ONOO^(-) which possesses remarkable toxicity to tumor as well as alleviating tumor hypoxia. it is found that M/B@R with NiR as the excitation source can significantly induce synthetic lethality to tumors via the hyperthermia, DNA damage and the ease of tumor hypoxia. Simultaneously, M/B@R also exhibits the potential for bimodal fluorescence and photothermal imaging. The RBCm-camouflaged NO delivery nanoplatform with bimodal imaging capability in this work may provide a new combinatorial paradigm to induce PTT/NO for cancer theranostic applications.

关键词： nitric oxide biomimetic nanoerythrocyte PTT/NO synergistic therapy bimodal imaging

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三维蜂窝碳的研究进展综述:性能和应用

中国科学：物理学、力学、天文学 2024年第5期54卷 97-128页

作者：谢璐蔡信强赵帅倪勇蓝玉成朱汉兴陈元平杨金波高飞魏宇杰王文瑞彭庆北京科技大学机械工程学院北京100083 中国科学院力学研究所非线性国家重点研究室北京100190 中国科学技术大学近代力学系合肥230026 department of Physics and engineering Physics Morgan State UniversityBaltimore MD 21251USA School of engineering Cardiff UniversityCardiff CF243AAUK 江苏大学物理与电子工程学院镇江212013 北京大学物理学院北京100871 Nuclear engineering and Radiological Sciences University of MichiganAnn Arbor MI 48109USA 中国科学院大学工程科学学院北京100049 广东空天科技研究院广州511458

蜂窝碳结构是由石墨烯纳米片构成的蜂窝状三维纳米多孔结构,具有低密度和高比表面积和孔隙率,同时也呈现出了如机械性能、热学性质等诸多优异性能,也为该材料在纳米电子器件、光电器件、热管理、催化、机械材料强化等领域提供了广阔的... 详细信息

蜂窝碳结构是由石墨烯纳米片构成的蜂窝状三维纳米多孔结构,具有低密度和高比表面积和孔隙率,同时也呈现出了如机械性能、热学性质等诸多优异性能,也为该材料在纳米电子器件、光电器件、热管理、催化、机械材料强化等领域提供了广阔的应用前景.本文讨论了蜂窝碳的一些可能的晶体结构,总结了文献报道的热性能和机械性能,阐述了蜂窝碳在气体存储、水净化和热力学等方面的应用.最后对相应的三维石墨烯结构进行了一定程度的延伸,并对该结构以及蜂窝碳在制备、性能、应用等方面做出了适当的总结和展望.

关键词：蜂窝结构石墨烯力学性能导热系数气体吸附海水淡化

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Soft and transient magnesium plasmonics for environmental and biomedical sensing

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Nano Research 2018年第8期11卷 4390-4400页

作者： Ruomu Li Suxia Xie Labao Zhang Liqiang Li Deying Kong QiangWang Run Xin Xing Sheng lan Yin Cunjiang Yu Xinran Wang Li Gao School of electronic and Optical engineering Nanjing University of Science and Technology Nanjing 210094 China School of Physics and electronics Hunan University of Science and Technology Xiangtan 41120 I China School of electronic Science and engineering Nanjing University Nanjing 210046 China Advanced Materials Division Suzhou Institute of Nano-Tech and Nano-Bionics Suzhou 215123 China School of Materials Science and engineering Tsinghua University 8eijing 100084 China department of electronic engineering Tsinghua University Beijing 100084 China department of Mechanical engineering University of Houston Houston TX 77204 USA School of Electrical and Computer engineering University of Wisconsin-Madison Madison WI $3706 USA

Due to its controlled reaction with water and biofluids, Mg as a dissolvable conductor has enabled the development of many transient electronic devices. in addition, Mg is a novel plasmonic material with high extinction efficiency but its transient optical properties have not been explored thoroughly. in this study for the first time, we exploit the transient and tunable plasmonic properties of Mg in environmental and biomedical sensor applications. We used soft nanoimprint lithography to fabricate flexible and large-area Mg plasmonic structures that can be applied on the human skin. Their resonance （or color） can be tuned in the visible range by gradual Mg dissolution in a water fluid or vapor-rich environment; these structures can be easily implemented as passive optical sensors without the need for complex electronic circuits or a power supply. We demonstrate the applications of our optical sensors in the accurate monitoring of environmental humidity and physiological detection of sweat loss on the human skin during exercise. Our devices could be used as decomposable/resorbable optical sensors and can help minimize long-term health effects and environmental risks associated with consumer device waste, which will lead to many new possibilities in transient photonic device applications.

关键词： plasmonics transient flexible tunable sensors

A GaN p-i-p-i-n Ultraviolet Avalanche Photodiode

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Chinese Physics Letters 2012年第9期29卷 193-195页

作者： ZHENG Ji-Yuan WANG Lai HAO Zhi-Biao LUO Yi WANG lan-Xi CHEN Xue-Kang Tsinghua national Laboratory for information Science and Technology State Key Laboratory on Integrated OptoelectronicsDepartment of Electronic EngineeringTsinghua UniversityBeijing 100084 Science and Technology on Surface engineering Laboratory Lanzhou Institute of PhysicsLanzhou 730000

A separated absorption and multiplication GaN p–i–p–i–n avalanche photo-diode(APD)with a 25μm diameter mesa is proposed and *** to the conventional p–i–n APD,the p–i–p–i–n structure reduces the probability of premature micro-plasma breakdown,raises the gain from 30 to 400 and reduces the work voltage from 93 to 48 *** temperature test is set on p–i–p–i–n APDs,and the positive coefficient of 30 mV/K shows that avalanche breakdown happens in the *** peak responsivity of p–i–p–i–n APDs is 0.11 A/W under a wavelength of 358 nm.

关键词： breakdown GaN avalanche