Chem. J. Chinese Universities

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Synthesis of TiN Nanocrystals with High Specific Surface Area by Hydrazide Sol-gel Method

LIU Mei-Ying, YOU Wan-Sheng, LEI Zhi-Bin, ZONG Xu, YING Pin-Liang, LI Can   

  1. State Key Laboratory of Catalysis Basis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:2005-10-21 Revised:1900-01-01 Online:2006-08-10 Published:2006-08-10
  • Contact: LI Can

Abstract: Nanocrystalline TiN with a high specific surface area was successfully prepared by the hydrazide sol-gel method with N2H4 as the nitrogen source. The effects of Ti sources, heat-treatment atmospheres, and temperature on the crystallization of TiN powder were studied and the crystallization mechanism of TiN nanocrystals was also discussed. TiCl3 is superior to TiCl4 and isopropoxide in the formation of well-crystallized TiN nanocrystals. NH3 has the advantage over N2 and Ar in the complete removal of residual carbon in TiN powder. In comparison with the traditional temperature-programmed reduction under flowing NH3 atmosphere, the hydrazide sol-gel route requires a relatively low temperature on the one hand(600 ℃) and TiN powder prepared by this synthetic approach exhibits a small particle size(10 nm) and an exceedingly high specific surface area(>135 m2/g) and disperses uniformly on the other hand. We expect that this methodology will provide a novel low-temperature route to synthesize nanocrystalline transition metal nitrides through choosing hydrazine as N-source precursor.

Key words: Hydrazine, Sol-gel, Low temperature, High specific surface area, Nano TiN

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