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Fabrication of grating-like polystyrene latex monolayer structure as three-dimensional calibration standards for scanning probe microscope

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Chinese Physics B 2009年第3期18卷 997-1001页

作者：朱国栋曾志刚国璋杜强国严学俭 Department of Materials Science Fudan University Department of Macromolecular Science Fudan University

This paper illuminates the preparation of grating-like polystyrene latex monolayer structure, which can minimize the effects of the size deviation of spheres and the defect transfer on the accuracy as calibration samples for micro-scopes. The latex films are grown on freshly cleaved mica substrates by vertical deposition method. The concentration dependence of the structure and the topography of latex films is characterized by optical microscope, ultraviolet- visible transmission spectrum and scanning probe microscope. The origination of such a grating-like structure is also discussed.

关键词： polystyrene spheres scanning probe microscope grating-like structure calibration samrile

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Preparation of Porous NiO-Ce_(0.8)Sm_(0.2)O_(1.9) Ceramics for Anode-supported Low-temperature Solid Oxide Fuel Cells

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Journal of Materials Science & Technology 2010年第6期26卷 523-528页

作者： Han Chen Kui Cheng Zhicheng Wang Wenjian Weng Ge Shen Piyi Du Gaorong Han Department of Materials Science and Engineering State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310027 China

Porous NiO-Ce0.8Sm0.2O1.9（NiO-SDC） ceramics with homogeneous pore distribution were prepared using polystyrene （PS） spheres as pore templates. NiO-SDC powders were synthesized by a glycine-nitrate method, ultrasonically mixed with PS spheres in ethanol, dried and then pressed into green pellets. The pellets were sintered to yield porous NiO-SDC ceramics. The effects of the sintering temperature on the microstructure and mechanical strength of the ceramics were investigated. NiO-SDC ceramics sintered at 1200 and 1350℃ have interconnected pore structures and high compression strength. When single cells were fabricated using porous NiO-SDC ceramics as anode-supported layers, the peak power density of the cells at 600℃ was 333 and 353 ***-2 for ceramics sintered at 1200 and 1350℃, respectively. The results indicated that these porous ceramic materials are promising for anode substrates for solid oxide fuel cells.

关键词： Porous ceramic NiO-Ce0.8Sm0.2O1.9 (NiO-SDC) polystyrene spheres Microstructure Anode-supported solid oxide fuel cells

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Improving self-assembly quality of colloidal crystal guided by statistical design of experiments

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Chinese Physics B 2017年第3期26卷 564-568页

作者：吴以治许小亮张海明刘玲李继超杨大宝 Department of Applied Physics School of Science Tianjin Polytechnic University Department of Physics University of Science and Technology of China

A versatile and reliable approach is created to fabricate wafer-scale colloidal crystal that consists of a monolayer of hexagonally close-packed polystyrene （PS） spheres. Making wafer-scale colloidal crystal is usually challenging, and it lacks a general theoretical guidance for experimental approaches. To obtain the optimal conditions for self-assembly, a systematic statistical design and analysis method is utilized here, which applies the pick-the-winner rule. This new method combines spin-coating and thermal treatment, and introduces a mixture of glycol and ethanol as a dispersion system to assist self-assembly. By controlling the parameters of self-assembly, we improve the quality of colloidal crystal and reduce the effect of noise on the experiment. To our best knowledge, we are first to pave this path to harvest colloidal crystals. Importantly, a theoretical analysis using an energy landscape base on our process is also developed to provide insights into the PS spheres＇ self-assembly.

关键词： self-assembly colloidal crystal polystyrene spheres statistical design

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Polymer nanowire vertical transistors

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Nano Research 2014年第6期7卷 938-944页

作者： Husande Li Tzushan Chen Yuchiang Chao Department of Physics and Center for Nano-Technology Chung Yuan Christian University Chung-Li 32023 Taiwan China

By utilizing poly（3-hexylthiophene）（P3HT） polymer nanowires with diameters of -15 nm as the vertical channel material, a polymer nanowire vertical transistor has been demonstrated for the first time. The P3HT nanowires were characterized by absorption spectroscopy and scanning electron microscopy. A saturated output current was created by increasing the thickness of the polymer layers between the electrodes through several spin-coating cycles of the polymer nanowires prepared in a marginal solvent. The carrier mobility was also increased through utilization of polymer nanowires with strong interchain interactions. By introducing a small hole injection barrier between the emitter and semiconducting polymer, an on/off current ratio of 1,500 was obtained. The operating voltage is less than 2 V.

关键词： polymer nanowires vertical transistors polystyrene spheres colloidal lithography

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