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Synthesis and bio-imaging application of highly luminescent mercaptosuccinic acid-coated CdTe nanocrystals.

Ying E, Li D, Guo S, Dong S, Wang J - PLoS ONE (2008)

Bottom Line: By selecting mercaptosuccinic acid (MSA) as capping agent and providing the borate-citrate acid buffering solution, CdTe nanocrystals with high quantum yield (QY >70% at pH range 5.0-8.0) can be conveniently prepared by this method.The influence of parameters such as the pH value of the precursor solution and the molar ratio of Cd(2+) to Na(2)TeO(3) on the QY of CdTe nanocrystals was systematically investigated in our experiments.Under optimal conditions, the QY of CdTe nanocrystals is even high up to 83%.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, China.

ABSTRACT
Here we present a facile one-pot method to prepare high-quality CdTe nanocrystals in aqueous phase. In contrast to the use of oxygen-sensitive NaHTe or H(2)Te as Te source in the current synthetic methods, we employ more stable sodium tellurite as the Te source for preparing highly luminescent CdTe nanocrystals in aqueous solution. By selecting mercaptosuccinic acid (MSA) as capping agent and providing the borate-citrate acid buffering solution, CdTe nanocrystals with high quantum yield (QY >70% at pH range 5.0-8.0) can be conveniently prepared by this method. The influence of parameters such as the pH value of the precursor solution and the molar ratio of Cd(2+) to Na(2)TeO(3) on the QY of CdTe nanocrystals was systematically investigated in our experiments. Under optimal conditions, the QY of CdTe nanocrystals is even high up to 83%. The biological application of luminescent MSA-CdTe to HEK 293 cell imaging was also illustrated.

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QYs of CdTe NCs prepared at different temperature before the refluxing.(Experimental conditions: pH = 5.0, [Cd2+] = 1 mM, MSA/Cd2+ = 3.0, Cd2+ /TeO32− = 4.0).
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pone-0002222-g004: QYs of CdTe NCs prepared at different temperature before the refluxing.(Experimental conditions: pH = 5.0, [Cd2+] = 1 mM, MSA/Cd2+ = 3.0, Cd2+ /TeO32− = 4.0).

Mentions: We also examine the reaction temperature of the precursor solution before the refluxing as the reducing capacity of NaBH4 is related not only to pH but also to the temperature. In our examined temperature range (0–60°C), no evident influence on the QYs of CdTe NCs were observed (Figure 4). This implies that the synthesis of CdTe NCs is not sensitive to the initial reaction temperature, and the growth conditions play a dominant role in the quality of CdTe NCs. Please note that the variation of temperature (precursor solution) actually influenced the PL peak position of NCs. This is because that different reaction temperature of the precursor will lead to different nucleation rate.


Synthesis and bio-imaging application of highly luminescent mercaptosuccinic acid-coated CdTe nanocrystals.

Ying E, Li D, Guo S, Dong S, Wang J - PLoS ONE (2008)

QYs of CdTe NCs prepared at different temperature before the refluxing.(Experimental conditions: pH = 5.0, [Cd2+] = 1 mM, MSA/Cd2+ = 3.0, Cd2+ /TeO32− = 4.0).
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC2377334&req=5

pone-0002222-g004: QYs of CdTe NCs prepared at different temperature before the refluxing.(Experimental conditions: pH = 5.0, [Cd2+] = 1 mM, MSA/Cd2+ = 3.0, Cd2+ /TeO32− = 4.0).
Mentions: We also examine the reaction temperature of the precursor solution before the refluxing as the reducing capacity of NaBH4 is related not only to pH but also to the temperature. In our examined temperature range (0–60°C), no evident influence on the QYs of CdTe NCs were observed (Figure 4). This implies that the synthesis of CdTe NCs is not sensitive to the initial reaction temperature, and the growth conditions play a dominant role in the quality of CdTe NCs. Please note that the variation of temperature (precursor solution) actually influenced the PL peak position of NCs. This is because that different reaction temperature of the precursor will lead to different nucleation rate.

Bottom Line: By selecting mercaptosuccinic acid (MSA) as capping agent and providing the borate-citrate acid buffering solution, CdTe nanocrystals with high quantum yield (QY >70% at pH range 5.0-8.0) can be conveniently prepared by this method.The influence of parameters such as the pH value of the precursor solution and the molar ratio of Cd(2+) to Na(2)TeO(3) on the QY of CdTe nanocrystals was systematically investigated in our experiments.Under optimal conditions, the QY of CdTe nanocrystals is even high up to 83%.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, China.

ABSTRACT
Here we present a facile one-pot method to prepare high-quality CdTe nanocrystals in aqueous phase. In contrast to the use of oxygen-sensitive NaHTe or H(2)Te as Te source in the current synthetic methods, we employ more stable sodium tellurite as the Te source for preparing highly luminescent CdTe nanocrystals in aqueous solution. By selecting mercaptosuccinic acid (MSA) as capping agent and providing the borate-citrate acid buffering solution, CdTe nanocrystals with high quantum yield (QY >70% at pH range 5.0-8.0) can be conveniently prepared by this method. The influence of parameters such as the pH value of the precursor solution and the molar ratio of Cd(2+) to Na(2)TeO(3) on the QY of CdTe nanocrystals was systematically investigated in our experiments. Under optimal conditions, the QY of CdTe nanocrystals is even high up to 83%. The biological application of luminescent MSA-CdTe to HEK 293 cell imaging was also illustrated.

Show MeSH