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

Nanyang Technological University

Research output: Contribution to journal › Journal article › Research › peer-review

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).

Original language	English
Journal	Nanotechnology
Volume	22
Issue number	27
Pages (from-to)	275706
ISSN	0957-4484
DOIs	https://doi.org/10.1088/0957-4484/22/27/275706
Publication status	Published - 2011

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title = "Stability studies of CdSe nanocrystals in an aqueous environment",

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).",

author = "Lifei Xi and Lek, {Jun Yan} and Liang, {Yen Nan} and Chris Boothroyd and Wenwen Zhou and Qingyu Yan and Xiao Hu and Chiang, {Freddy Boey Yin} and Lam, {Yeng Ming}",

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doi = "10.1088/0957-4484/22/27/275706",

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T1 - Stability studies of CdSe nanocrystals in an aqueous environment

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

Y1 - 2011

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).

U2 - 10.1088/0957-4484/22/27/275706

DO - 10.1088/0957-4484/22/27/275706

M3 - Journal article

SN - 0957-4484

VL - 22

SP - 275706

JO - Nanotechnology

JF - Nanotechnology

IS - 27

ER -

Stability studies of CdSe nanocrystals in an aqueous environment

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