Open Access Nano Express

Facile preparation of highly luminescent CdTe quantum dots within hyperbranched poly(amidoamine)s and their application in bio-imaging

Yunfeng Shi1*, Lin Liu1*, Huan Pang1*, Hongli Zhou1, Guanqing Zhang1, Yangyan Ou1, Xiaoyin Zhang1, Jimin Du1 and Wangchuan Xiao2

Author Affiliations

1 School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, People’s Republic of China

2 School of Resources and Chemical Engineering, Sanming University, Sanming 365004, People’s Republic of China

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Nanoscale Research Letters 2014, 9:115  doi:10.1186/1556-276X-9-115

Published: 13 March 2014

Abstract

A new strategy for facile preparation of highly luminescent CdTe quantum dots (QDs) within amine-terminated hyperbranched poly(amidoamine)s (HPAMAM) was proposed in this paper. CdTe precursors were first prepared by adding NaHTe to aqueous Cd2+ chelated by 3-mercaptopropionic sodium (MPA-Na), and then HPAMAM was introduced to stabilize the CdTe precursors. After microwave irradiation, highly fluorescent and stable CdTe QDs stabilized by MPA-Na and HPAMAM were obtained. The CdTe QDs showed a high quantum yield (QY) up to 58%. By preparing CdTe QDs within HPAMAM, the biocompatibility properties of HPAMAM and the optical, electrical properties of CdTe QDs can be combined, endowing the CdTe QDs with biocompatibility. The resulting CdTe QDs can be directly used in biomedical fields, and their potential application in bio-imaging was investigated.

Keywords:
Hyperbranched poly(amidoamine)s; CdTe quantum dots; Fluorescence; Nanocomposites; Bio-imaging