Open Access Nano Express

Ammonium fluoride-activated synthesis of cubic δ-TaN nanoparticles at low temperatures

Young-Jun Lee1, Dae-Young Kim1, Kap-Ho Lee2, Moon-Hee Han1, Kyoung-Soo Kang3, Ki-Kwang Bae3 and Jong-Hyeon Lee12*

Author affiliations

1 Graduate School of Green Energy Technology, Chungnam National University, Daejeon 305-764, Republic of Korea

2 Graduate School of Department of Metallurgical Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea

3 Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea

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Citation and License

Nanoscale Research Letters 2013, 8:126  doi:10.1186/1556-276X-8-126

Published: 15 March 2013

Abstract

Cubic delta-tantalum nitride (δ-TaN) nanoparticles were selectively prepared using a K2TaF7 + (5 + k) NaN3 + kNH4F reactive mixture (k being the number of moles of NH4F) via a combustion process under a nitrogen pressure of 2.0 MPa. The combustion temperature, when plotted as a function of the number of moles of NH4F used, was in the range of 850°C to 1,170°C. X-ray diffraction patterns revealed the formation of cubic δ-TaN nanoparticles at 850°C to 950°C when NH4F is used in an amount of 2.0 mol (or greater) in the combustion experiment. Phase pure cubic δ-TaN synthesized at k = 4 exhibited a specific surface area of 30.59 m2/g and grain size of 5 to 10 nm, as estimated from the transmission electron microscopy micrograph. The role of NH4F in the formation process of δ-TaN is discussed with regard to a hypothetical reaction mechanism.

Keywords:
Cubic δ-TaN; Combustion synthesis; Ammonium fluoride; Nanoparticles