Ultrafast synthesis of near-infrared-emitting aqueous CdTe/CdS quantum dots with high fluorescence |
| |
Authors: | Yuan Jiang Haibao Shao Hangning Xu Jiahao Yang Yi Wang Haonan Xiong Pengyao Wang Xilin Wang |
| |
Institution: | 1. Institute of Electron Device & Application, Hangzhou Dianzi University, Hangzhou, 310018, People''s Republic of China;2. School of Electronics & Information, Nantong University, Nantong, 226019, People''s Republic of China |
| |
Abstract: | The traditional aqueous route to synthesis CdTe/CdS Core/shell (c/s) quantum dots (QDs) via decomposition of Cd-thiol complexes is usually time consuming. Herein, an ultrafast and facile aqueous synthetic approach under atmospheric pressure for CdTe/CdS c/s QDs with emission from the green to the near-infrared window (535–820 nm) is reported. With purified CdTe core QDs diluted in solution of Cd-3-mercaptopropionic acid (MPA) complexes, CdTe/CdS c/s QDs with emission wavelengths at 700 and 800 nm can be obtained within 20- and 45-min refluxing under the optimized experimental conditions, respectively. This is the most rapid way to prepare CdTe/CdS c/s QDs in aqueous phase, and the obtained QDs were highly luminescent without postsynthesis treatment. The influences of various experimental factors, including Cd2+ concentration, MPA-to-Cd ratio, pH value, and dilution ratio on the growth rate and luminescent properties of the obtained CdTe/CdS c/s QDs, have been taken into consideration. The three processes “purification-dilution-addition” ensure the synthesis environment with high pH value and low core concentration and have a marked impact on the rapid synthesis rate and the resulting high fluorescence of CdTe/CdS c/s QDs. |
| |
Keywords: | Aqueous quantum dots Core/shell structure Near-infrared-emitting Ultrafast synthesis |
本文献已被 ScienceDirect 等数据库收录! |
|