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Measurement and Analysis of Three-Dimensional Surface Topography of Sawn Timber Based on scanning probe Method

Journal of Renewable Materials 2022年第12期10卷 3303-3311页

作者： Yuhang He Rongzhuo Zhang Sarah Mohrmann Zheng Wang Jiujin Fang Jiangsu Co-Innovation Center of Efcient Processing and Utilization of Forest Resources College of Materials Science and TechnologyNanjing Forestry UniversityNanjing210037China College of Civil Engineering Nanjing Forestry UniversityNanjing210037China College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing210037China

In order to explore the characteristics of the three-dimensional surface morphology of sawn timber,a three-dimensional wood surface morphology tester based on the scanning probe method and the principle of atomic force microscope was used to test the three-dimensional sur face morphology of three kinds of sawn timber and calculate its surface *** study also analyzed the reasonable plan for the value of wood surface roughness and the advantages of the three dimensional shape tester,as well as the influence of tree species,three sections,air dry density and other factors on the surface roughness of the specimen after mechanical *** results have shown that it is a more appropriate method to select the calculated values of S。and Sq as the evaluation of the surface roughness of wood with random surface *** three dimensional wood surface topo-graphy tester can efficiently,conveniently and accurately display the three dimensional topography of wood at a micron-level resolution,and is characterized by high eficiency and good *** three dimensional surface morphology characteristics of the three sawn woods correspond to their *** surface roughness of woods is arranged as follows:Sitka spruce>Larch>*** the same tree species,the roughness of the corresponding section after sawing is as follows:chordwise section>crosswise section>radial *** radial section has lower roughness than the other *** surface roughness of the wood after sawing is mainly related to its air-dry *** above is intended to provide a useful reference for the application of measuring and evaluating the surface roughness of sawn timber using the three dimensional surface topography test method.

关键词： scanning probe sawn timber three dimensional topography test surface roughness

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Nanofabrication of the gold scanning probe for the STM-SECM coupling system with nanoscale spatial resolution

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Science China Chemistry 2017年第5期60卷 649-655页

作者： Fang-Fang Wang Wei Wang Xi He Lianhuan Han Jian-Zhang Zhou Zhong-Qun Tian Zhao-Wu Tian Dongping Zhan State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen University Chemical Engineering and Environmental Engineering College of Chemistry Liaoning Shihua University

scanning probe is the key issue for the electrochemical scanning probe techniques(EC-SPM) such as EC-scanning tunnel microscopy(STM), EC-atomic force microscopy(AFM) and scanning electrochemical microscopy(SECM), especially the insulative encapsulation of the nanoelectrode probe for both positioning and electrochemical feedbacks. To solve this problem,we develop a novel fabrication method of the gold nanoelectrodes: firstly, a micropipette with nanomter-sized orifice was prepared as the template by a laser puller; secondly, the inside wall of micropipette apex was blocked by compact and conic Au nano-piece through electroless plating; thirdly, the Au nano-piece was grown by bipolar electroplating and connected with a silver wire as a current collector. The fabricated Au nanoelectrode has very good voltammetric responses for the electrodic processes of both mass transfer and adsorption. The advantage lies in that it is well encapsulated by a thin glass sealing layer with a RG value lowered to 1.3, which makes it qualified in the SECM-STM coupling mode. On one hand, it can serve as STM tip for positioning which ensures the high spatial resolution; on the other hand, it is a high-quality nanoelectrode to explore the local chemical activity of the substrate. The nanofabrication method may promote the SPM techniques to obtain simultaneously the physical and chemical images with nanoscale spatial resolution, which opens a new approach to tip chemistry in electrochemical nanocatalysis and tip-enhanced spectroscopy.

关键词： scanning probe SECM bipolar nanoelectrode electrochemical imaging

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Polar or nonpolar? That is not the question for perovskite solar cells

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National Science Review 2021年第8期8卷 57-68页

作者： Boyuan Huang Zhenghao Liu Changwei Wu Yuan Zhang Jinjin Zhao Xiao Wang Jiangyu Li Department of Materials Science and Engineering Southern University of Science and Technology Guangdong Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences School of Materials Science and Engineering Key Laboratory of Smart Materials and Structures Mechanics of Hebei ProvinceShijiazhuang Tiedao University

Perovskite solar cells(PSC) are promising next generation photovoltaic technologies, and there is considerable interest in the role of possible polarization of organic-inorganic halide perovskites(OIHPs) in photovoltaic conversion. The polarity of OIHPs is still hotly debated, however. In this review, we examine recent literature on the polarity of OIHPs from both theoretical and experimental points of view, and argue that they can be both polar and nonpolar, depending on composition, processing and *** of OIHP polarity to photovoltaic conversion are also discussed, and new insights gained through research efforts. In the future, integration of a local scanning probe with global macroscopic measurements in situ will provide invaluable microscopic insight into the intriguing macroscopic phenomena, while synchrotron diffractions and scanning transmission electron microscopy on more stable samples may ultimately settle the debate.

关键词： perovskite solar cells polarity ferroelectricity first-principles calculations scanning probe photovoltaic implication

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