Abstract
This paper describes a novel method for surface modification of water soluble CdTe quantum dots (QDs) by using poly(acrylic acid) grafted onto salep (salep-g-PAA) as a biopolymer. As-prepared CdTe-salep-g-PAA QDs were characterized by Fourier transform infrared (FT-IR) spectrum, thermogravimetric (TG) analysis, and transmission electron microscopy (TEM). The absorption and fluorescence emission spectra were measured to investigate the effect of salep-g-PAA biopolymer on the optical properties of CdTe QDs. The results showed that the optical properties of CdTe QDs were significantly enhanced by using salep-g-PAA-based biopolymer.
Highlights
CdTe quantum dots (QDs) are novel high-efficiency fluorescence materials with unique chemical and physical properties [1,2,3]
Water-soluble CdTe QDs can be synthesized through the selection of appropriate ligand molecules such as thioglycolic acid (TGA) and 3-mercaptopropionic acid, but low quantum yields (QYs) are typically obtained [15,16,17]
We present a novel strategy for surface modification of CdTe QDs by poly(acrylic acid) grafted onto salep (Scheme 1)
Summary
CdTe quantum dots (QDs) are novel high-efficiency fluorescence materials with unique chemical and physical properties [1,2,3]. Salep is a nontoxic and stable water-soluble polysaccharide extracted from dried tubers of certain natural terrestrial orchids possessing interesting gelling properties widely explored for a variety of life science applications. It is a biopolymer composed of a linear copolymer which consists of glucomannan (16–60%), starch (2.7%), nitrogenous substance (5%), moisture (12%), and ash (2.4%) [21,22,23]. We present a novel strategy for surface modification of CdTe QDs by poly(acrylic acid) grafted onto salep (salep-g-PAA) (Scheme 1) This new synthesis procedure was carried out in aqueous phase at low temperature conditions and can be a good candidate for wide applications in biological detection
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