Iron pyrite: Phase and shape control by facile hot injection method

Pure phases of cubic and spherical FeS2 nanocrystals (NCs) with the mean size of 80nm and 30nm, respectively, were obtained using trioctylamine and oleylamine as the solvents to dissolve the sulfur source via a facile and efficient hot injection method. The pure phase formation and shape control wer...

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Bibliographic Details
Published in:Journal of crystal growth 2017-03, Vol.461, p.53-59
Main Authors: Trinh, Thanh Kieu, Pham, Viet Thanh Hau, Truong, Nguyen Tam Nguyen, Kim, Chang Duk, Park, Chinho
Format: Article
Language:English
Subjects:
A1. Impurities
A1. Phase Change
A1. Shape control
A1.Crystal morphology
Active control
B1. Nanocrystals
B1. Sulfides
Chemical compounds
Nanocrystals
Optical properties
Photovoltaic cells
Pyrite
Shape control
Solar cells
Solvents
Sulfur
Trioctylamine
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Summary:Pure phases of cubic and spherical FeS2 nanocrystals (NCs) with the mean size of 80nm and 30nm, respectively, were obtained using trioctylamine and oleylamine as the solvents to dissolve the sulfur source via a facile and efficient hot injection method. The pure phase formation and shape control were strongly dependent on the concentration of active sulfur source (H2S) that could be formed by the reaction between the elemental sulfur and a primary amine. The chemically active sulfur source could facilitate the formation of a pure FeS2 phase from a FeS phase via a Fe3S4 phase. In addition, the active sulfur concentration is believed to be the main factor to drive the orientation attachment to obtain different shapes of FeS2 NCs. The obtained FeS2 pyrite NCs with excellent phase purity and good optical properties are believed to have potential applications to various energy devices including low-cost photovoltaics. •The pure phase and shape control of FeS2 NCs are achieved by hot injection method.•The H2S presence facilitates the formation of FeS2 phase from FeS via Fe3S4 phase.•The shape of FeS2 NCs can be controlled in the different active sulfur conditions.•The properties of obtained FeS2 NCs were studied by XRD, Raman, XPS and UV–Vis.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2016.12.108