High-quality and water-soluble near-infrared photolumineseent CdHgTe/CdS quantum dots prepared by adjusting size and composition
High-quality and water-soluble near-infrared photolumineseent CdHgTe/CdS quantum dots prepared by adjusting size and composition
复制标题
DOI：
10.1021/jp074961c
复制
发表时间：
2007-11-15
影响因子：
3.7
通讯作者：
Ren, Jicun
中科院分区：
文献类型：
--
作者：
Qian, Huifeng;Dong, Chaoqing;Ren, Jicun
在巯基稳定剂存在下，通过加热CdCl 2、Hg（ClO 4）（2）和NaHTe的混合溶液，在水中直接合成了近红外（NIR）CdHgTe合金量子点。的CdHgTe量子点表现出的光致发光（PL）范围从600至830 nm，可以通过调整的大小和组成。量子点的量子产率（QY）约为20- 50%，与它们的发射波长和组成有关。与已报道的CdTe/CdHgTe和InAs等近红外量子点相比，所制备的CdHgTe合金量子点具有更窄的发射光谱，其半峰全宽（fwhm）仅为60-80 nm。HRTEM和XRD表征表明，CdHgTe量子点具有良好的单分散性和晶体结构。为了提高CdHgTe量子点的光稳定性并降低其细胞毒性，在CdHgTe量子点核的表面添加了CdS纳米壳。此外，CdHgTe/CdS核/壳量子点被成功地应用于活体动物的成像。我们的初步结果表明，我们的合成过程是非常简单和廉价的，所制备的产品CdHgTe/CdS核/壳量子点是水溶性和光稳定的，将是一个替代的探针在活体动物成像。
In this article, near-infrared (NIR) CdHgTe alloyed quantum dots (QDs) were directly synthesized in water by heating a mixed solution of CdCb, Hg(ClO4)(2) and NaHTe in the presence of thiol stabilizers. The CdHgTe QDs exhibit photoluminescence (PL) ranging from 600 to 830 nm that can be tuned by size and composition. The quantum yields (QYs) of QDs were about 20-50%, associated with their emission wavelength and composition. Compared to other reported NIR QDs such as CdTe/CdHgTe and InAs, the as-prepared CdHgTe alloyed QDs have much narrower emission spectra, and their full widths at half-maximum (fwhm) are only 60-80 nm. Characterization by HRTEM and XRD showed that the CdHgTe QDs have good monodispersity and a nice crystal structure. To improve the photostability and reduce the cytotoxity of the CdHgTe QDs, a CdS nanocrystal shell was added to the surface of the CdHgTe QD core. Furthermore, the CdHgTe/CdS core/shell QDs were successfully applied for the imaging of living animals. Our preliminary results illustrate that our synthesis procedure is very simple and inexpensive and that the as-prepared products CdHgTe/CdS core/shell QDs are water-soluble and photostable and will be an alternative probe in the imaging of living animals.