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Electrical Conductivity Control in SPNT Process

K.C. Nguyen, H.P. Dinh, T.T. Tran
Saigon Hi Tech Park Research Laboratories (SHTP Labs), VN

Keywords: SPNT, slow bake process, fast bake process


ABSTRACT Electrical conductivity in SPNT (Solid Phase Nano Tube) had been found strongly depends on baking process and baking temperature, chemistry of solid carbon source. First, in the SPNT process, the material and process control must provide tube shape product from the key baking step in inert gas environment. Certain range of the metallic catalyst amount and only few of carbon sources having specific cellulose chemical functionality does show tube shape. Secondly, for the electrical conductivity control, baking process including baking mode, baking temperature, baking time seems to play the key role. In the slow baking mode, the temperature of the reaction chamber was slowly raised from room temperature up to targeted temperature and the reactor was kept at this targeted temperature until the end of the process. However, in the fast process, the reaction chamber containing precursor of CNT was suddenly inserted into the targeted temperature right away and continued through the key bake step . These two baking modes give a big deal on the hollowness of the tube and electrical conductivity: the hollow tube having higher conductivity comes out from the fast baking mode with electrical conductivity varies in an order of 103 when baking temperature changes between 700C and 1000C. The baking time does show some effect on electrical conductivity change; the longer baking time the higher electrical conductivity. The electrical conductivity of some SPNT can go beyond that of GPNT (Gas Phase Nano Tube) in the order of 10X.
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