Strong NIR luminescent Ag2S@ZnS core-shells synthesized by a novel one pot pulsed microwave irradiation
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- 作者：Masoud Karimipour ; masoud.karimipour@gmail.com ; Nafiseh Moradi ; Mehdi Molaei
- 关键词：Ag2S@ZnS core-shells ; Quantum yield ; Thioglycolic acid ; Photoluminescence
- 刊名：Journal of Luminescence
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：182
- 期：Complete
- 页码：91-97
- 全文大小：1486 K
- 卷排序：182
文摘
Synthesis of Ag2S quantum dots (QDs) in water with increasing both Near Infrared (NIR) emission and nontoxicity of Ag2S quantum dots (QDs) have been a great challenge in nano-biotechnology. To reconcile these issues synthesis of Ag2S@ZnS in water with high quantum yield has been a great challenge. In this report, we have synthesized high quality and ultrafine Ag2S@ZnS core-shells in water with a fast and facile microwave irradiation technique. Thioglycolic acid (TGA) was employed as capping agent for the synthesis of Ag2S@ZnS in water for the first time. The prepared core-shells were optimized based on different experimental parameters and verified using UV–vis and PL spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. It was found that the core-shells show a strong absorption at 805 nm and emission located at 857 nm with a narrow width of 60 nm. The quantum yield of prepared core-shells was found to be 5.3% which is the highest value reported yet.