Stability studies of CdSe nanocrystals in an aqueous environment

Lifei Xi; Jun Yan Lek; Yen Nan Liang; Chris Boothroyd; Wenwen Zhou; Qingyu Yan; Xiao Hu; Freddy Boey Yin Chiang; Yeng Ming Lam

doi:10.1088/0957-4484/22/27/275706

Stability studies of CdSe nanocrystals in an aqueous environment

Lifei Xi, Jun Yan Lek, Yen Nan Liang, Chris Boothroyd, Wenwen Zhou, Qingyu Yan, Xiao Hu, Freddy Boey Yin Chiang, Yeng Ming Lam

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

In this paper, CdSe nanocrystal dissolution in an aqueous solution was studied. It was found that light is a key factor affecting the dissolution of nanocrystals. In the presence of light, the electrons generated from CdSe nanocrystals reduce water to hydrogen and hydroxide ions (OH^-) while photo-generated holes oxidize CdSe to Cd^{2 +} and elemental Se. The dissolution was accelerated in an acidic medium while moderate alkalinity (pH = 10.3) can slow down the dissolution possibly due to precipitation of nanocrystals. This study has strong implications for the use of these crystals in aqueous environments (bioimaging and dye-sensitized solar cells).

Original language	English
Article number	275706
Journal	Nanotechnology
Volume	22
Issue number	27
DOIs	https://doi.org/10.1088/0957-4484/22/27/275706
Publication status	Published - Jul 8 2011
Externally published	Yes

ASJC Scopus Subject Areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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abstract = "In this paper, CdSe nanocrystal dissolution in an aqueous solution was studied. It was found that light is a key factor affecting the dissolution of nanocrystals. In the presence of light, the electrons generated from CdSe nanocrystals reduce water to hydrogen and hydroxide ions (OH-) while photo-generated holes oxidize CdSe to Cd2 + and elemental Se. The dissolution was accelerated in an acidic medium while moderate alkalinity (pH = 10.3) can slow down the dissolution possibly due to precipitation of nanocrystals. This study has strong implications for the use of these crystals in aqueous environments (bioimaging and dye-sensitized solar cells).",

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AU - Xi, Lifei

AU - Lek, Jun Yan

AU - Liang, Yen Nan

AU - Boothroyd, Chris

AU - Zhou, Wenwen

AU - Yan, Qingyu

AU - Hu, Xiao

AU - Chiang, Freddy Boey Yin

AU - Lam, Yeng Ming

PY - 2011/7/8

Y1 - 2011/7/8

N2 - In this paper, CdSe nanocrystal dissolution in an aqueous solution was studied. It was found that light is a key factor affecting the dissolution of nanocrystals. In the presence of light, the electrons generated from CdSe nanocrystals reduce water to hydrogen and hydroxide ions (OH-) while photo-generated holes oxidize CdSe to Cd2 + and elemental Se. The dissolution was accelerated in an acidic medium while moderate alkalinity (pH = 10.3) can slow down the dissolution possibly due to precipitation of nanocrystals. This study has strong implications for the use of these crystals in aqueous environments (bioimaging and dye-sensitized solar cells).

AB - In this paper, CdSe nanocrystal dissolution in an aqueous solution was studied. It was found that light is a key factor affecting the dissolution of nanocrystals. In the presence of light, the electrons generated from CdSe nanocrystals reduce water to hydrogen and hydroxide ions (OH-) while photo-generated holes oxidize CdSe to Cd2 + and elemental Se. The dissolution was accelerated in an acidic medium while moderate alkalinity (pH = 10.3) can slow down the dissolution possibly due to precipitation of nanocrystals. This study has strong implications for the use of these crystals in aqueous environments (bioimaging and dye-sensitized solar cells).

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Stability studies of CdSe nanocrystals in an aqueous environment

Abstract

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