Departmental Bulletin Paper カーボンナノチューブ黒体の開発

山口, 拓人

In order to measure the specific heat and melting enthalpy of the high-temperature melt contained in a refractory metal cell based on the principle of high-speed electric heating calorimetry, it is the most important to accurately measure the sample temperature using radiation thermometry. In general, the accuracy of radiation thermometry can increase as the sample emissivity approaches unity. In this work, we have attempted to make theemissivity of tungsten substrates almost unity by covering their surfaces with carbon nanotube arrays synthesized based on a chemical vapor deposition process assisted by a simple mechanical surface treatment. Discontinuous films of alumina formed by the grit blasting act as the catalyst-support layer necessary for growing carbon nanotube (CNT) arrays on tungsten substrate. By using this method, we have obtained the carbon nanotubesblackbody that exhibits a reflectance of less than 1% in the visible region. Furthermore, we have succeeded ingrowing a uniform multiwall carbon nanotube layer on the surface of a tungsten tube, which has a curved surface.In addition, we have experimentally confirmed that the CNT films grown on tungsten substrates were maintainedeven after they were heated up to 2300K.Key Words : Carbon nanotube, blackbody, CVD, alumina, grit-blasting

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