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首页> 外文期刊>Nanotechnology >Silver sulfide nanoparticle assembly obtained by reacting an assembled silver nanoparticle template with hydrogen sulfide gas
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Silver sulfide nanoparticle assembly obtained by reacting an assembled silver nanoparticle template with hydrogen sulfide gas

机译：通过使组装的银纳米颗粒模板与硫化氢气体反应获得的硫化银纳米颗粒组件

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摘要

A fast, simple procedure is described for obtaining an assembly of silver sulfide nanoparticles (Ag2S NPs) on a glass substrate through reaction of a template of an assembled layer of silver nanoparticles (Ag NPs) with hydrogen sulfide (H2S) gas. The Ag NP template was prepared by assembling a monolayer of spherical Ag NPs (mean diameter of 7.4 nm) on a polyethylenimine-treated glass substrate. Exposure to pure H2S for 10 min converted the Ag NPs of the template to Ag2S NPs. The resulting Ag2S NP assembly, which retains the template nanostructure and particle distribution, was characterized by optical absorption spectroscopy, atomic force microscopy, transmission electron microscopy (TEM), scanning high resolution TEM, energy dispersive x-ray spectroscopy and x-ray photoelectron spectroscopy. The Ag2S NPs have a crystal structure of monoclinic acanthite, and while they retained the spherical shape of the original Ag NPs, their mean particle size increased to 8.4 nm due to changes to the crystal structure when the Ag NPs are converted into Ag2S NPs. The measured optical absorption edge of the Ag2S NP assembly indicated an indirect interband transition with a band gap energy of 1.71 eV. The Ag2S NP assembly absorbed light with wavelengths below 725 nm, and the absorbance increased monotonically toward the UV region.
机译：描述了一种快速，简单的程序，用于通过使银纳米颗粒（Ag NPs）组装层的模板与硫化氢（H2S）气体反应，在玻璃基板上获得硫化银纳米颗粒（Ag2S NPs）的组装体。通过在球形聚乙烯亚胺处理的玻璃基板上组装单层球形Ag NP（平均直径7.4 nm）来制备Ag NP模板。暴露于纯H2S 10分钟可将模板的Ag NP转化为Ag2S NP。保留的模板纳米结构和颗粒分布的所得Ag2S NP组件通过光学吸收光谱，原子力显微镜，透射电子显微镜（TEM），扫描高分辨率TEM，能量色散X射线光谱和X射线光电子光谱进行表征。 Ag2S NPs具有单斜硅钙石的晶体结构，尽管它们保留了原始Ag NPs的球形，但由于将Ag NPs转换为Ag2S NPs时晶体结构的变化，其平均粒径增加到8.4 nm。 Ag2S NP组件的测量光吸收边缘表明带隙能量为1.71 eV的间接带间跃迁。 Ag2S NP组件吸收波长低于725 nm的光，并且吸收率朝着UV区单调增加。

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