Open AccessEDTA-assisted hydrothermal synthesis of FeS2/NiSe2 nanocomposites and the optical and electrical properties of their thin films
Author(s) -
Rongliang Wu,
Yufeng Zheng,
Xiaogang Zhang,
Yi Sun,
Xu Jinbao
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.3493
Subject(s) - materials science , nanocrystalline material , pyrite , hydrothermal circulation , band gap , grain size , nanocomposite , absorbance , thin film , semiconductor , chemical engineering , nanotechnology , optoelectronics , composite material , optics , metallurgy , engineering , physics
Nonacomposites of NiSe2was successfully synthesized by EDTAassisted hydrothe rm al method, adding NiSe2 with MX2 structure as seed. X_ray diffraction pa tterns indicate that the products are single phase FeS2(pyrite) with the average grain size of about 48nm. FeS2thin films were prepared by screen_printing method and annealed at high temperature. It has been shown that they have an increased direct bandgap. With increasing amount of seed, the absorbance edges in the ultraviolet_visible range show a red shift; the resistance goes up; Hall mobility rises and the carrier c oncentration decreases. The FeS2thin film shows an n_type semiconductor chara cteristic. The mechanism of the formation of FeS2(pyrite) nanocrystalline was discussed in terms of the growth process.