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Heterodoped nanoflakes: synthesis and characterization of sulfur‐doped NbSe 2 nanoflakes
Author(s) -
Chen Shuai,
Li Hongping,
Tang Hua,
Zhang Yi,
Yang Jin,
Ji Xiao Rui,
Chen Lin,
Zhang Kun,
Li Changsheng
Publication year - 2014
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201300354
Subject(s) - sulfur , heteroatom , dopant , doping , chemistry , base (topology) , chemical engineering , crystallography , nanotechnology , materials science , organic chemistry , optoelectronics , ring (chemistry) , mathematical analysis , mathematics , engineering
Doping of NbSe 2 with heteroatoms is an effective way to tailor its properties. Here, solid phase synthesis process has been utilized for growing uniform and excellent crystalline nano‐NbSe 2 by sulfur dopant during the growing process. The sulfur‐doped mechanism of nano‐NbS 2x Se 2(1‐x) (x = 0.03∼0.2) has been investigated: the sulfur atoms not only replace the Se position but also intercalate in layer gap by one‐step reaction. In the structure of NbSe 2 , the sulfur atoms replace the positions of Se atoms and then are located in the empty octahedral positions of van der waals gap between the NbSe 2 layers with the increase of sulfur content. The lubrication properties of the as‐prepared NbSe 2 and sulfur‐doped NbSe 2 powders as additives in HVI1500 base oil were discussed. The lubrication properties of base oil was improved by both NbSe 2 and sulfur‐doped NbSe 2 . Furthermore, the lubrication properties of sulfur‐doped (0.1at%) NbSe 2 are better than those of pure NbSe 2 in HVI1500 base oil, which could be attributed to their thin laminated structure and the sulfur dopant.