Silver-Based Metal Sulfide Heterostructures: Synthetic Approaches, Characterization, and Application Prospects
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- 作者：Pei-Jung Wu ; Jhe-Wei Yu ; His-Jung Chao ; Jia-Yaw Chang
- 刊名：Chemistry of Materials
- 出版年：2014
- 出版时间：June 10, 2014
- 年：2014
- 卷：26
- 期：11
- 页码：3485-3494
- 全文大小：660K
- 年卷期：v.26,no.11(June 10, 2014)
- ISSN：1520-5002
文摘
We present a simple solution-processed synthesis route to access several types of silver-based metal sulfide heterostructures. The route uses a seed-mediated strategy involving ex situ and in situ seed-mediated growth. An ex situ seed-mediated growth protocol was used to synthesize Ag2S/ZnS and Ag2S/CdS heterostructures, while the in situ seed-mediated growth provided control over the nucleation stage in the presence and absence of oleylamine, allowing for the preparation of either Ag@AIS or Ag2S/AIS heterostructures, respectively. The as-synthesized heterostructures could also subsequently act as a nucleation platform for the attachment of the exterior material (ZnS), yielding AgCdS/ZnS, Ag@AIS/ZnS, and AgInZnS heterostructured nanomaterials, in the same reaction vessel without intermediate seed purification. In particular, the length of Ag2S/ZnS nanorods was adjustable from 12 nm up to 450 nm by increasing injecting volume of the ZnS precursors. Based on the experimental results, we have also proposed a possible formation mechanism and the underlying factors that determine the morphology of silver-based metal sulfide heterostructures. In optical studies, the Ag2S/ZnS nanorods exhibited dual emission, including the NIR emission and blue emission attributed to the band-gap emission of Ag2S and ZnS, respectively. The synthesized Ag2S/CdS heterostructures showed an emission peak at 540 nm with a fluorescence lifetime of 2.5 渭s, which is 1.5 orders of magnitude longer than that of CdS samples. Meanwhile, the potential for the Ag2S/CdS heterodimers as an effective sensitizer in photovoltaic devices was examined under AM 1.5G illumination.