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Catalytic synthesis of the ZnO-carbon nanofilament composite for sensor applications
Minoru Kuwata,Koji Iwasaki,Hidenori Gamo,Kiyoharu Nakagawa,Toshihiro Ando,Mikka Nishitani-Gamo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
We have studied to synthesize a ZnO-carbon nanofilament composite (ZnO-CNF) as it is expected to yield an interesting properties for sensor applications. The ZnO-CNF is considered to have a large surface area and a high electrical conductivity. The ZnO-supported Co catalysts were used for the synthesis of the ZnO-CNF. In order to fabricate a pattern of the composite for a biosensor, we have tried to prepare a paste from the composite for a screen-printing. We found that Co loaded catalysts exhibited a high catalytic activity for the carbon yields. SEM observation revealed that fibriform carbon deposits were obtained on the surface of the ZnO powder. In the case of using the Co-loaded ZnO catalyst, we found that the diameter of the fibriform carbon nanomaterial depended on the C2H4 concentration in the reaction gas. The reaction conditions are important to control the diameter of the fibriform carbon nanomaterial. The ZnO-CNF paste consisted of the ZnO-CNF, ethyl cellulose, and 2-(2-Butoxyethoxy) ethanol was prepared. The line patterns having 150μm were successfully fabricated with using the paste by screen-printing method.
Cathodoluminescence spectroscopic study of the boron-nitrogen co-doping diamond films
Yuko Hatanaka,Sadao Takeuchi,Koji Iwasaki,Hidenori Gamo,Kiyoharu Nakagawa,Toshihiro Ando,Mikka Nishitani-Gamo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Co-doping diamond is of scientific and technologically interest because a new electrical and/or optical property is expected to obtain. In this study, we have carried out a simultaneous addition of diborane and nitrogen in the gas phase for the growth of co-doping diamonds by microwave plasma-assisted chemical vapor deposition (MPCVD) method. We measured the cathodoluminescence (CL) spectra of the co-doping diamond films. To investigate the effect of boron-nitrogen co-doping addition on the CL spectra, we compared the CL spectra of boron-nitrogen co-doping diamonds with those of nitrogen-doped diamonds. The results revealed that the addition of boron suppressed the nitrogen incorporation into the CVD diamonds.