| 一锅合成绿色到近红外发射的CdTe量子点 |
| One-Pot Synthesis of Green- to Near Infrared-Emitting CdTe Quantum Dots |
|
| 摘要: 以3-巯基丙酸(MPA)为稳定剂，采用水相合成法制备了从绿色到近红外发射的CdTe量子点。系统研究了反应液pH值、镉和碲的物质的量之比及镉和3-巯基丙酸的物质的量之比等实验条件对CdTe量子点体系的发射波长和荧光量子产率的影响。在pH值为10.5，且nCd2+∶nTe2+∶nMPA=1∶0.05∶1.1的条件下，回流0.5 h，CdTe量子点体系在569 nm波长处的荧光量子产率达到30.8%；在7 h的回流时间内，制备的量子点的波长覆盖范围为525~730 nm。分别用X射线粉末衍射、透射电镜和红外光谱对CdTe量子点的晶体结构、形貌及表面基团进行表征。 |
| 关键词: 量子点 近红外 荧光 制备 |
| 基金项目: |
| Abstract: CdTe quantum dots (QDs) with emission wavelength from green to near infrared is synthesized in aqueous phase when mercaptopropionic acid (MPA) acts as capping reagent. The effects of pH of reaction solution, molar ratios of nCd/nTe and nCd/nMPA on the emission peak and photoluminescence (PL) quantum yield (QY) of CdTe QDs are investigated, respectively. It is found that 30.8% of PL QY is achieved for CdTe at 569 nm when reaction system is refluxed for 0.5 h at pH 10.5, and nCd2+∶nTe2+∶nMPA=1∶0.05∶1.1. By controlling the reflux time within 7 hrs, the PL emission peak range of CdTe quantum dots in aqueous solution is from 525 to 730 nm. The crystal structure, morphology and surface groups of CdTe QDs are characterized using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR), individually. |
| Keywords: quantum dots near infrared luminescence synthesis |
| |
| 摘要点击次数: 1752 |
| 全文下载次数: 1946 |
| 王益林,万 鑫,刘声燕,周立亚.一锅合成绿色到近红外发射的CdTe量子点[J].无机化学学报,2012,28(1):97-102. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
