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PREPARATION　AND　CRYSTALLINE　MICROSTRUCTURE　OF　RAPIDLY　SOLIDIFIED　NEW　AMORPHOUS　Al－Fe－V－Si－Mm　ALLOY

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中国有色金属学会会刊：英文版 1995年第4期5卷 133-138页

作者： Wang, Jianqiang Gu, Tao Zeng, Meiguang chen, xiufang Zhang, Baojing Northeastern Univ Shenyang China

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关键词： rapid solidification Al-Fe-V-Si-Mm alloy amorphous phase annealed crystallization

In-situ-reduced synthesis of cyano group modified g-C_(3)N_(4)/CaCO_(3) composite with highly enhanced photocatalytic activity for nicotine elimination

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Journal of Environmental Sciences 2023年第4期126卷 517-530页

作者： chenxiao Qi Haixiang chen xiufang chen chengyu Chu Xueting Mei Wangyang Lu Nan Li National Engineering Lab for Textile Fiber Materials&Processing Technology(Zhejiang) Zhejiang Sci-Tech UniversityHangzhou 310018China

Graphite carbon nitride has many excellent properties as a two-dimensional semiconductor material so that it has a wide application prospect in the field of ***,the traditional problems such as high recombination rate of photogenerated carriers limit its *** this work,we introduce nitrogen deficiency into g-C_(3)N_(4)to solve this problem a simple and safe in-situ reduction method.g-C_(3)N_(4)/CaCO_(3)was obtained by a simple and safe one-step calcination method with industrial-grade micron particles CaCO_(3).Cyano group modification was in-situ reduced during the thermal polymerization process,which would change the internal electronic structure of g-C_(3)N_(4).The successful combination of g-C_(3)N_(4)and CaCO_(3)and the introduction of cyanide have been proved by Fourier transform infrared spectroscopy and X-ray photoelectron *** formation of the cyano group,an electron-absorbing group,promotes the effective separation of photogenic electron hole pairs and inhibits the recombination of photogenic *** advantages result in the generation of more·O_(2)-and1O_(2)in the catalytic system,which increases the photocatalytic efficiency of nicotine degradation by ten ***,the degradation process of nicotine has been studied in this work to provide a basis for the degradation of nicotine organic pollutants in the air.

关键词： Photocatalytic g-C_(3)N_(4) Cyano group Catalytic fiber Nicotine degradation

Facile fabrication of superior antibacterial cotton fabric based on ZnO nanoparticles/quaternary ammonium salts hybrid composites and mechanism study

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Frontiers of Materials Science 2023年第2期17卷 105-120页

作者： Yechen Hu Lin Zhang Yafeng Huang xiufang chen Fengtao chen Wangyang Lu National Engineering Lab for Textile Fiber Materials&Processing Technology(Zhejiang) Zhejiang Sci-Tech UniversityHangzhou 310018China

In the research for the safe and efficiently antibacterial cotton fabrics to minimize risk for human health,an organic–inorganic hybrid material of ZnO nanoparticles(NPs)and quaternary ammonium salt(QAS)was employed to modify cotton fabrics by a dipping–padding–drying *** synergistic effects of ZnO NPs and QAS on the structure and antibacterial properties of cotton fabrics were studied in *** displayed that the QAS and ZnO NPs were immobilized firmly in cotton fabric by the formation of chemical covalent bonds and silica gel ***/QAS/cotton had a good inhibitory effect on the growth of *** and ***,with superior antibacterial efficiency of>99.99%.ZnO/QAS/cotton preserved good mechanical property,water absorbability,and *** also provided a detailed analysis of antibacterial mechanism for the hybrid *** contact mechanism and the Zn2+release were considered as the main mechanisms for the ZnO/QAS/cotton,while the reactive oxygen species(ROS)generation only had a little contribution to the antibacterial *** short,the excellent integrated properties endowed the hybrid cotton fabrics as potential application in many fields,like healthcare,food packaging.

关键词： ZnO quaternary ammonium salt organic-inorganic hybrid material antibacterial mechanism

Effective Increase of Crystal Area during Sublimation Growth of 6H-SiC by Using the Cone-shaped Baffle

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Journal of Materials Science & Technology 2007年第5期23卷 685-688页

作者： Shouzhen JIANG Xiangang XU Xiaobo HU Juan LI xiufang chen Minhua JIANG State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China College of Physics and Electronics Shandong Normal University Jinan 250014 China

A novel design of crucible is proposed in this paper for the growth of SiC crystals. The relation between grown crystal shape and temperature distribution in a growth chamber was discussed. It is pointed out that the crystal shape had a close relationship with temperature distribution. The calculations suggested that the radial temperature field of the growing crystal became homogenous by setting up the cone-shaped baffle in the growth chamber. By modifying the crucible design and temperature distribution in the growth chamber, it is possible to enhance the enlargement of crystal, and also possible to keep grown surface flat.

关键词： 6H-SIC Sublimation method Simulation Temperature distribution

Robust Co_(3)O_(4)nanocatalysts supported on biomass-derived porous N-doped carbon toward low-pressure hydrogenation of furfural

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Frontiers of Materials Science 2023年第2期17卷 155-168页

作者： Lin Zhang Lanlan cheng Yechen Hu Qingguang Xiao xiufang chen Wangyang Lu National Engineering Lab for Textile Fiber Materials&Processing Technology(Zhejiang) Zhejiang Sci-Tech UniversityHangzhou 310018China

The catalytic conversion of biomass platform chemicals using abundant non-noble metal nanocatalysts is a challenging ***,high-density cobalt oxide nanoparticles loaded on biomass-derived porous N-doped carbon(NC)was fabricated by a tandem hydrothermal pyrolysis and mild nitrate decomposition process,which is a green and cheap preparation *** Co_(3)O_(4) nanoparticles with the average size of 12 nm were uniformly distributed on the porous *** nanocomposites also possessed large surface area,high N content,good dispersibility in isopropanol,and furfural *** to these characteristics,the novel cobalt nanocatalyst exhibited high catalytic activity for producing furfuryl alcohol,yielding 98.7%of the conversion and 97.1%of the selectivity at 160℃ for 6 h under 1 bar *** control experiments implied that both direct hydrogenation and transfer hydrogenation pathways co-existed in the hydrogenation *** excellent catalytic activity of Co_(3)O_(4)@NC was attributed to the cooperative effects of porous NC and Co_(3)O_(4) *** approach provides a new idea to design effective high-density nonnoble metal oxide nanocatalysts for hydrogenation reactions,which can make full use of sustainable natural biomass.

关键词： biomass N-doped carbon cobalt oxide nanoparticle hydrogenation reaction low pressure

Fine Machining of Large-Diameter 6H-SiC Wafers

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Journal of Materials Science & Technology 2006年第5期22卷 681-684页

作者： xiufang chen Juan LI Deying MA Xiaobo HU Xiangang XU Minhua JIANG State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Three main machining processes of large-diameter 6H-SiC wafers were introduced in this paper. These processes include cutting, lapping and polishing. Lapping causes great residual stresses and deep damage layer which can be reduced gradually with subsequent polishing processes. Surfaces prepared by mechanical polishing （MP） appeared a large number of scratches with depth of 5-8 nm. These scratches can be effectively removed by chemo-mechanical polishing （CMP）. After CMP. extremely smooth and low damage layer surface with roughness Ra=0.3 nm was obtained. Atomic force microscopy （AFM） and optical microscopy were used to observe the surface morphology of samples and a high resolution X-ray diffractometer （HRXRD） was used for the crystal lattice perfection of the subsurface region. Changes of surface residual stresses during machining processes were investigated by HRXRD.

关键词： 6H-SiC Chemo-mechanical polishing (CMP) Roughness

Research progress of large size SiC single crystal materials and devices

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Light(Science & Applications) 2023年第1期12卷 60-67页

作者： xiufang chen Xianglong Yang Xuejian Xie Yan Peng Longfei Xiao chen Shao Huadong Li Xiaobo Hu Xiangang Xu State Key Laboratory of Crystal Materials Institute of novel semiconductorsShandong UniversityJinan 250100China

SiC semiconductor is the focus of recent international *** is also an important raw material for China to achieve carbon emission peak and carbon *** nearly 20 years of research and development,we focus on the three types SiC crystals,n-type,p-type and semi-insulating,indicating the development of Shandong University for crystal *** defects control,electrical property,atomic polishing,and corresponding device authentication all obtain great *** dislocation density of 6-inch n-type substrates decreases to 2307 cm^(-2),where BPD(Basal Plane Dislocation)lowers to 333 cm^(-2) and TSD(Threading Screw Dislocation)19 cm^(-2).The full width at half maximum(FWHM)(0004)rocking curves is only 14.4 *** resistivity reaches more than 1E+12Ω·cm for semi-insulating SiC and lower than 20 mΩ·cm for n-type *** impurity concentrations in 6-inch high-purity semi-insulating(HPSI)SiC crystals reach extreme low *** devices made of various substrate materials have good performance.

关键词： crystal size purity

Anomalous Resistivity in Vanadium-Doped Semi-Insulating 4H-SiC Wafers

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Acta Metallurgica Sinica(English Letters) 2014年第6期27卷 1083-1087页

作者： Xianglong Yang Kun Yang Yingxin Cui Yan Peng xiufang chen Xuejian Xie Xiaobo Hu State Key Laboratory of Crystal Materials Shandong University

The resistivities of vanadium-doped semi-insulating 4H-SiC wafers were measured by a contactless resistivity measurement system. Anomalous resistivity was found in semi-insulating 4H-SiC wafer. Raman spectra of semi-insulating4H-SiC wafer indicated that the anomalous resistivity was caused by polytype inclusion. Based on the activation energies of different SiC polytypes calculated from resistivity versus temperature data measured by COREMA-VT, the resistivities in the vanadium-doped semi-insulating 4H-SiC wafer with 6H polytype inclusion were calculated. The calculated resistivities are quite consistent with the measured resistivities. Furthermore, the compensation mechanism for the formation of anomalous resistivity was proposed.

关键词： SiC Anomalous resistivity Polytype inclusion Activation energy Compensation mechanism

Thermal Oxidation of Silicon Carbide Substrates

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Journal of Materials Science & Technology 2009年第1期25卷 115-118页

作者： xiufang chen Liana Ning Yingmin Wang Juan Li Xiangang Xu Xiaobo Hu Minhua Jiang State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Thermal oxidation was used to remove the subsurface damage of silicon carbide （SIC） surfaces. The anisotropy of oxidation and the composition of oxide layers on Si and C faces were analyzed. Regular pits were observed on the surface after the removal of the oxide layers, which were detrimental to the growth of high quality epitaxial layers. The thickness and composition of the oxide layers were characterized by Rutherford backscattering spectrometry （RBS） and X-ray photoelectron spectroscopy （XPS）, respectively. Epitaxial growth was performed in a metal organic chemical vapor deposition （MOCVD） system. The substrate surface morphology after removing the oxide layer and gallium nitride （GaN） epilayer surface were observed by atomic force microscopy （AFM）. The results showed that the GaN epilayer grown on the oxidized substrates was superior to that on the unoxidized substrates.

关键词： SiC Thermal oxidation GaN epitaxy