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In situ preparation of fluorescent CdTe quantum dots with small thiols and hyperbranched polymers as co-stabilizers.

Shi Y, Ma Z, Cui N, Liu Y, Hou X, Du W, Liu L, Gangsheng T - Nanoscale Res Lett (2014)

Bottom Line: MPA and HPAMAM were added in turn to coordinate Cd2+.Such a strategy avoids the aftertreatment of thiol-stabilized QDs in their bioapplication and provides an opportunity for direct biomedical use of QDs due to the existence of biocompatible HPAMAM.The resulting CdTe QDs combine the mechanical, biocompatibility properties of HPAMAM and the optical, electrical properties of CdTe QDs together.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, People's Republic of China. shiyunfeng2009@gmail.com.

ABSTRACT
A new strategy for in situ preparation of highly fluorescent CdTe quantum dots (QDs) with 3-mercaptopropionic acid (MPA) and hyperbranched poly(amidoamine)s (HPAMAM) as co-stabilizers was proposed in this paper. MPA and HPAMAM were added in turn to coordinate Cd2+. After adding NaHTe and further microwave irradiation, fluorescent CdTe QDs stabilized by MPA and HPAMAM were obtained. Such a strategy avoids the aftertreatment of thiol-stabilized QDs in their bioapplication and provides an opportunity for direct biomedical use of QDs due to the existence of biocompatible HPAMAM. The resulting CdTe QDs combine the mechanical, biocompatibility properties of HPAMAM and the optical, electrical properties of CdTe QDs together.

No MeSH data available.


TGA weight loss curve of (a) pure HPAMAM and (b) CdTe QDs stabilized both by MPA and HPAMAM. The excitonic absorption peak at 589 nm.
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Figure 8: TGA weight loss curve of (a) pure HPAMAM and (b) CdTe QDs stabilized both by MPA and HPAMAM. The excitonic absorption peak at 589 nm.

Mentions: The composition of CdTe QDs stabilized both by HPAMAM and MPA was characterized by TGA. From the TGA thermogram in Figure 8a, we can see a long temperature range from 200°C to 450°C, which is the decomposition temperature for HPAMAM. For the CdTe QDs stabilized both by HPAMAM and MPA, the weight fraction is 45.6% at 794°C, as shown in Figure 8b. This means that the content of CdTe QDs in the nanocomposites is 45.6%.


In situ preparation of fluorescent CdTe quantum dots with small thiols and hyperbranched polymers as co-stabilizers.

Shi Y, Ma Z, Cui N, Liu Y, Hou X, Du W, Liu L, Gangsheng T - Nanoscale Res Lett (2014)

TGA weight loss curve of (a) pure HPAMAM and (b) CdTe QDs stabilized both by MPA and HPAMAM. The excitonic absorption peak at 589 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3974601&req=5

Figure 8: TGA weight loss curve of (a) pure HPAMAM and (b) CdTe QDs stabilized both by MPA and HPAMAM. The excitonic absorption peak at 589 nm.
Mentions: The composition of CdTe QDs stabilized both by HPAMAM and MPA was characterized by TGA. From the TGA thermogram in Figure 8a, we can see a long temperature range from 200°C to 450°C, which is the decomposition temperature for HPAMAM. For the CdTe QDs stabilized both by HPAMAM and MPA, the weight fraction is 45.6% at 794°C, as shown in Figure 8b. This means that the content of CdTe QDs in the nanocomposites is 45.6%.

Bottom Line: MPA and HPAMAM were added in turn to coordinate Cd2+.Such a strategy avoids the aftertreatment of thiol-stabilized QDs in their bioapplication and provides an opportunity for direct biomedical use of QDs due to the existence of biocompatible HPAMAM.The resulting CdTe QDs combine the mechanical, biocompatibility properties of HPAMAM and the optical, electrical properties of CdTe QDs together.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, People's Republic of China. shiyunfeng2009@gmail.com.

ABSTRACT
A new strategy for in situ preparation of highly fluorescent CdTe quantum dots (QDs) with 3-mercaptopropionic acid (MPA) and hyperbranched poly(amidoamine)s (HPAMAM) as co-stabilizers was proposed in this paper. MPA and HPAMAM were added in turn to coordinate Cd2+. After adding NaHTe and further microwave irradiation, fluorescent CdTe QDs stabilized by MPA and HPAMAM were obtained. Such a strategy avoids the aftertreatment of thiol-stabilized QDs in their bioapplication and provides an opportunity for direct biomedical use of QDs due to the existence of biocompatible HPAMAM. The resulting CdTe QDs combine the mechanical, biocompatibility properties of HPAMAM and the optical, electrical properties of CdTe QDs together.

No MeSH data available.