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 Yin Chiang Boey; 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 Yin Chiang Boey
, Yeng Ming Lam^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

18 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 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). © 2011 IOP Publishing Ltd.

Original language	English
Article number	275706
Journal	Nanotechnology
Volume	22
Issue number	27
Online published	20 May 2011
DOIs	https://doi.org/10.1088/0957-4484/22/27/275706
Publication status	Published - 8 Jul 2011
Externally published	Yes

Funding

This work is supported by the Science and Engineering Research Council, Agency for Science, Technology and Research (A*STAR), Singapore.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

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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). {\textcopyright} 2011 IOP Publishing Ltd.",

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

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

language = "English",

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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 - Boey, Freddy Yin Chiang

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). © 2011 IOP Publishing Ltd.

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). © 2011 IOP Publishing Ltd.

UR - https://www.scopus.com/pages/publications/79957859400

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-79957859400&origin=recordpage

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

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

M3 - RGC 21 - Publication in refereed journal

SN - 0957-4484

VL - 22

JO - Nanotechnology

JF - Nanotechnology

IS - 27

M1 - 275706

ER -

Stability studies of CdSe nanocrystals in an aqueous environment

Abstract

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