气-固相还原硫酸盐制备系列硫化物纳米晶

Preparation of Various Sulfide Nanocrystals from Sulfate by Gas-Solid Phase Reduction

过渡金属硫化物纳米晶因其特异的结构具有量子尺寸效应、小尺寸效应、表面效应等效应，显示出不同于体相材料的光电磁性质．因而成为近年来纳米科学研究的热点。几十年来，硫化亚铁（FeS）及二硫化亚铁（FeS2）因其电学、磁学性质及相转变特性．引起了材料科学家广泛的关注。MnS是一种ⅦB-ⅥA族的弱磁性半导体材料．在制备太阳能电池的窗口／缓冲材料、短波光电器件方面有着潜在的应用。纳米尺度的PbS能带从近红外蓝移到可见光区域．呈现出奇异的光学性质和电学性质，

Various metallic sulfide nanocrystals were synthesized with sulfate and hexamine at 300-600 ℃ in a high pressure reactor. The materials were investigated by a variety of techniques, including X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, field scanning electron microscopy （SEM）, and highresolution transmission electron microscopy （HRTEM）. The results indicate that various metallic sulfide nanocrystals, such as hexaganal FeS, MnS, PbS and ZnS, can be prepared by the present synthetic method under 500 ℃ for 12 h; the as-prepared FeS samples are single-crystal flakes with hexaganal phase. This synthetic method is a novel strategy for the synthesis of metallic sulfide nanocrystals, which may provide a new approach to the synthesis of other sulfide nanostructures.