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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.


TEM image and EDS spectrum of CdTe QDs. (a) TEM image (inset, the corresponding SAED pattern) and (b) EDS spectrum of CdTe QDs stabilized both by MPA and HPAMAM (the excitonic absorption peak at 589 nm).
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Figure 5: TEM image and EDS spectrum of CdTe QDs. (a) TEM image (inset, the corresponding SAED pattern) and (b) EDS spectrum of CdTe QDs stabilized both by MPA and HPAMAM (the excitonic absorption peak at 589 nm).

Mentions: The morphology of CdTe QDs (the excitonic absorption peak at 589 nm) was characterized by TEM, as shown in Figure 5. From the TEM image, we can see the size of CdTe QDs is about 3.5 nm, and the size is quite uniform. The SAED pattern inside Figure 4a shows that the synthesized fluorescent nanoparticles are polycrystalline. The corresponding EDS spectrum (Figure 5b) gives the signals of Cd and Te elements, confirming the existence of CdTe QDs.


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)

TEM image and EDS spectrum of CdTe QDs. (a) TEM image (inset, the corresponding SAED pattern) and (b) EDS spectrum of 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 5: TEM image and EDS spectrum of CdTe QDs. (a) TEM image (inset, the corresponding SAED pattern) and (b) EDS spectrum of CdTe QDs stabilized both by MPA and HPAMAM (the excitonic absorption peak at 589 nm).
Mentions: The morphology of CdTe QDs (the excitonic absorption peak at 589 nm) was characterized by TEM, as shown in Figure 5. From the TEM image, we can see the size of CdTe QDs is about 3.5 nm, and the size is quite uniform. The SAED pattern inside Figure 4a shows that the synthesized fluorescent nanoparticles are polycrystalline. The corresponding EDS spectrum (Figure 5b) gives the signals of Cd and Te elements, confirming the existence of CdTe QDs.

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.