Synthesis of Stoichiometric FeS2 through Plasma-Assisted Sulfurization of Fe2O3 Nanorods

被引：105

作者：

Morrish, Rachel ^{[1
]}

Silverstein, Rebecca ^{[1
]}

Wolden, Colin A. ^{[1
]}

机构：

[1] Colorado Sch Mines, Dept Chem & Biol Engn, Golden, CO 80401 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 43期

基金：

美国国家科学基金会;

关键词：

CHEMICAL-VAPOR-DEPOSITION; IRON PYRITE; PHOTOVOLTAIC ABSORBERS; HYDROGEN-SULFIDE; FILMS; OXIDATION; OXIDES; PHASE; NANOCRYSTALS; SULFURATION;

D O I：

10.1021/ja307412e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Pyrite (FeS2) thin films were synthesized using a H2S plasma to sulfurize hematite (Fe2O3) nanorods deposited by chemical bath deposition. The high S activity within the plasma enabled a direct solid-state transformation between the two materials, bypassing S-deficient contaminant phases (Fe1-xS). The application of plasma dramatically enhanced both the rate of conversion and the quality of the resulting material; stoichiometric FeS2 was obtained at a moderate temperature of 400 degrees C using a chalcogen partial pressure <6 X 10(-5) atm. As the S:Fe atomic ratio increased from 0 to 2.0, the apparent optical band gap dropped from 2.2 (hematite) to similar to 1 eV (pyrite), with completely converted layers exhibiting absorption coefficients >10(5) cm(-1) in the visible range. Room-temperature conductivity of FeS2 films was on the order of 10(-4) S cm(-1) and approximately doubled under calibrated solar illumination.

引用

页码：17854 / 17857

页数：4

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