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使用酵母单元生物合成具有生物相容性的碲化镉量子原点.pdf
Nano Res (2010) 3: 481–489 481
Nano Res (2010) 3: 481–489
DOI 10.1007/s12274-010-0008-6
Research Article
Biosynthesis of Biocompatible Cadmium Telluride Quantum Dots
Using Yeast Cells
Haifeng Bao, Na Hao, Yunxia Yang, and Dongyuan Zhao ()
Department of Chemical Engineering, Monash University, Clayton, VIC3800, Australia
Received: 14 April 2010 / Revised: 9 May 2010 / Accepted: 11 May 2010
© The Author(s) 2010. This article is published with open access at S
ABSTRACT
We demonstrate a simple and efficient biosynthesis method to prepare easily harvested biocompatible
cadmium telluride (CdTe) quantum dots (QDs) with tunable fluorescence emission using yeast cells.
Ultraviolet–visible (UV–vis) spectroscopy, photoluminescence (PL) spectroscopy, X-ray diffraction (XRD), and
transmission electron microscopy (TEM) confirm that the CdTe QDs are formed via an extracellular growth
and subsequent endocytosis pathway and have size-tunable optical properties with fluorescence emission from
490 to 560 nm and a cubic zinc blende structure with good crystallinity. In particular, the CdTe QDs with
uniform size (2–3.6 nm) are protein-capped, which makes them highly soluble in water, and in situ bio-imaging
in yeast cells indicates that the biosynthesized QDs have good biocompatibility. This work provides an
economic and environmentally friendly approach to synthesize highly fluorescent biocompatible CdTe QDs for
bio-imaging and bio-labeling applications.
KEYWORDS
Cadmium telluride (CdTe) quantum dots, biosynthesis, biocompatible, in situ bio-imaging
1. Introduction the visible range when excited by a single excitation
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