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Surface Carbon chemical states of Ion Implanted AISI 440C Martensitic Stainless Steel

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Journal of Iron and Steel Research International 2015年第6期22卷 513-518页

作者： Jie JIN Feng-bin LIU Yun-bo CHEN Ke-wei GAO School of Materials Science and Engineering University of Science and Technology Beijing China Academy of Machinery Science and Technology College of Mechanical and Electric Engineering North China University of Technology

Carbon atoms segregate in the surface region for polished AISI 440C stainless steel After ion implanta tion, the surface carbon atoms exist in different forms. To elucidate their existence, surface structures and carbon chemical states o[ unimplanted, N~ implanted, Ti＋ implanted and N＋/Ti＋ co-implanted samples were analyzed by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and X-ray photoelectron spectroscopy （XPS）. The results indicated that various phases form in the surface or subsurface region after ion implantation, while the surface topography of the samples remains intact. For polished unimplanted sample, besides some Fe3 C phase and C- C phase, Cr, Cs phase dominates its surface region. Little change of carbon chemical states occurs after N＋ ion im- plantation. For Ti＋ implanted sample, besides some metal oxycarbide phases, most carbon amorphous phases form in surface region. Concerning N＋/Ti＋ co-implantation, CrrCs compound as well as Fe^C phase dominates the sur face region while no C-C phase is found. In addition, compared with single ion implantation, N＋/Ti＋ co-implanta tion would increase the ion implantation depth significantly. The formed phases of the carbon atoms play an impor- tant role in affecting the surface properties of AISI 440C stainless steel.

关键词： AISI 440C steel carbon segregation ion implantation chemical state phase

chemical stability of La_2O_3 in La_2O_3-Mo cathode materials

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中国有色金属学会会刊：英文版 2001年第5期11卷 681-683页

作者：王金淑周美玲聂祚仁张久兴王亦曼左铁镛北京工业大学材料学院教育部新型功能材料重点实验室北京

chemical stability of La 2O 3 in carbonized and uncarbonized La 2O 3 Mo cathodes was studied by in situ XPS analysis. Experimental results show that chemical stability of La 2O 3 is not good enough. In vacuum and at high temperature, oxygen can be dissociated from the lattice of La 2O 3 in the uncarbonized La 2O 3 Mo cathode. Binding energy shifts of La?3d5/2 and La?3d3/2 core peaks, and obvious decrease of satellite peak intensity in La?3d doublet with increasing temperature show that metallic La appears at carbonized La 2O 3 Mo cathode surface at high temperature.

关键词： lanthanum chemical state La 2O 3 Mo cathode XPS

The chemical states and Location-dependent Stability of Chlorine in Meso-structured Hybrid Perovskite Solar Cells

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The Chemical States and Location-dependent Stability of Chlo...

EXPERIMENTAL AND THEORETICAL RESEARCH OF ELECTRON EMISSION MECHANISM OF M-TYPE CATHODES

第五届新型太阳能电池学术研讨会

作者： Huiying Chen Yaping Sun Hao Chen Tianjin Zhang Duofa Wang School of Material Science and Engineering Hubei University

Inorganic-organic hybrid perovskite solar cells have become of interest due to their high solar-to-electric power conversion efficiencies and low fabrication *** was reported that chlorine doping was an effective means of improving the conversion efficiency and stability of these ***,the role of chlorine in the MAPb IClperovskite was still the subject of much *** the present work,we fabricated Cl-containing perovskite films by spin-coating a mixed solution of CHNHCl and CHNHI on PbIfilms in *** chemical state of Cl in these films was investigated by X-ray diffraction and X-ray photoelectron *** was found that the Cl was present in different chemical states depending on the concentration of CHNHCl used in the original ***,power conversion efficiencies up to 19.0% was achieved by samples with concentration of MACl 2mg/mL.

关键词： Perovskite solar cell Chlorine chemical state

来源： cnki会议评论

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Journal of Electronics(China) 2014年第2期31卷 159-167页

作者： Yin Shengyi Key Laboratory of High Power Microwave Sources and Technologies Institute of ElectronicsChinese Academy of Sciences

With the most advanced Synchronous Radiation Photoelectron Spectrum(SRPS),the emission mechanism of M-type cathodes has been investigated from the perspective of chemical *** on the experimental results of SRPS analysis,a new model of the electron emission mechanism for M-type cathode is *** main topics in this paper include the research status of electron emission mechanism of M-type cathodes;the advantages of SRPS technology;the distribution of oxygen chemical state on the cathode surface and the evolvement of oxygen chemical state during activation process;the relation between barium chemical state and osmium(Os)-coating;surplus barium and its formula;the characteristics of Os,and other noble metal coatings;the relation between film characteristics and emission performance of cathodes,the inhibition effects to the emission for Platinum(Pt)-coated cathode,*** the end of this paper,electron emission mechanism of M-type cathode is summarized and foreseen.

关键词： M-type cathodes Synchronous Radiation Photoelectron Spectrum(SRPS) chemical state Oxygen Surplus barium

Photo-induced self-formation of dual-cocatalysts on semiconductor surface

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Chinese Journal of Catalysis 2018年第11期39卷 1730-1735页

作者： Linchao Mu Qiao Zhang Xiaoping Tao Yue Zhao Shengyang Wang Junyan Cui Fengtao Fan Can Li state Key Laboratory of Catalysis Dalian National Laboratory for Clean Energyand the Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Cocatalyst plays key roles in photogenerated charge separation and surface catalytic reactions in ***,it is not clear if the chemical states of cocatalysts changed or remains unchanged under photocatalytic reaction ***,taking NaTaO3 as an example,we systemically investigated the chemical states of nickel‐based cocatalysts during photocatalytic water splitting *** was found that photo‐induced self‐formation of Ni and NiO cocatalyst species take place on the surface of NaTaO3 *** self‐formation of dual‐cocatalysts not only occurs on 26‐facet NaTaO3,but also takes place on a more general 6‐facet *** work clarified that the chemical states of cocatalysts are changing and the redox dual‐cocatalysts are redistributed on the semiconductor surface owing to the reaction induced by photogenerated charges under the condition of photocatalytic reactions.

关键词： Photocatalysis Cocatalyst chemical state Photogenerated charges Self‐formation

Surface Characterization of Ni_(64)P_(20)Fe_(16)Amorphous Alloy by X-ray Photoelectron Spectroscopy and Auger Electron Spectroscopy

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Journal of Materials Science & Technology 1992年第3期8卷 157-162页

作者：姜洪刚王景唐丁炳哲 state Key Laboratory for RSA Institute of Metal ResearchAcademia SinicaShenyang110015China To whom correspondence should be addressed state Key Laboratory for RSA Institute of Metal ResearchAcademia SinicaShenyang110015China

The nature of the native oxides formed on the surface layer of amorphous alloy Ni_(64)P_(20)Fe_(16)has been studied by X-ray photoelectron spectroscopy (XPS)and Auger electron spectroscopy(AES)with depth profiling by ion *** are great distinctions in compositions and chemical states between the surface layer and the *** main constituents Ni,P and Fe are lower in the sur- face layer,and they are mostly in oxidized states, whereas C,O and N are enriched in the surface lay- *** thickness of surface oxide layer is approximately 20 nm,this layer was assumed to be of great significance to various properties of amor- phous alloy Ni_(64)P_(20)Fe_(16),expecially to the chemical and catalytic *** proved that transitional element Fe cannot improve oxidation resistance of the amorphous Ni-P system.

关键词： amorphous alloy Ni_(64)P_(20)Fe_(16) surface layer composition chemical state

黄铁矿烧渣中重金属的化学形态及分级提取-ICP-MS分析

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黄铁矿烧渣中重金属的化学形态及分级提取-ICP-MS分析