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Iodinated SnO2 quantum dots : A facile and efficient approach to increase solar absorption for visible-light photocatalysis

Li, Pu; Lan, Yong; Zhang, Qian; Zhao, Ziyan; Pullerits, Tönu LU ; Zheng, Kaibo LU and Zhou, Ying (2016) In Journal of Physical Chemistry C 120(17). p.9253-9262
Abstract

Efficient visible-light-driven photocatalysis can be achieved over conventional wide band gap semiconductor, in which iodinated SnO2 quantum dots (QDs) are synthesized via hydrolysis of crystalline SnI4 in the absence of any additives or templates. The formation of SnO2 QDs reveals a wide preparation window and a very fast growth rate in minute scale. The iodine species may only exist on the surface of SnO2 QDs, which can be completely removed through heat treatment. SnO2 QDs reveal the light absorption in visible range which increases the limited optical absorption of bulk SnO2. Notably, the iodination can further enhance the visible light absorption due to the formation... (More)

Efficient visible-light-driven photocatalysis can be achieved over conventional wide band gap semiconductor, in which iodinated SnO2 quantum dots (QDs) are synthesized via hydrolysis of crystalline SnI4 in the absence of any additives or templates. The formation of SnO2 QDs reveals a wide preparation window and a very fast growth rate in minute scale. The iodine species may only exist on the surface of SnO2 QDs, which can be completely removed through heat treatment. SnO2 QDs reveal the light absorption in visible range which increases the limited optical absorption of bulk SnO2. Notably, the iodination can further enhance the visible light absorption due to the formation of band tail states. Therefore, iodinated SnO2 QDs exhibit significantly enhanced visible-light-driven photocatalytic activity toward degradation of rhodamine B and oxidation of NO in ppb level. Time-resolved spectroscopic studies reveal that the iodine species in QDs can not only server to passivate the surface traps to prolong the lifetime of the excited states when excited above the band gap, but they can also effectively absorb visible light and generate enhancement for photocatalytic reactions. The present study highlights the surface modification of wide band gap semiconductor for exploring efficient visible-light-active photocatalysts.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
120
issue
17
pages
10 pages
publisher
The American Chemical Society
external identifiers
  • Scopus:84969179832
ISSN
1932-7447
DOI
10.1021/acs.jpcc.6b01530
language
English
LU publication?
yes
id
7099de59-e3df-43b1-bbd0-fd368f8fdb8e
date added to LUP
2016-09-28 12:15:44
date last changed
2016-10-13 05:14:26
@misc{7099de59-e3df-43b1-bbd0-fd368f8fdb8e,
  abstract     = {<p>Efficient visible-light-driven photocatalysis can be achieved over conventional wide band gap semiconductor, in which iodinated SnO<sub>2</sub> quantum dots (QDs) are synthesized via hydrolysis of crystalline SnI<sub>4</sub> in the absence of any additives or templates. The formation of SnO<sub>2</sub> QDs reveals a wide preparation window and a very fast growth rate in minute scale. The iodine species may only exist on the surface of SnO<sub>2</sub> QDs, which can be completely removed through heat treatment. SnO<sub>2</sub> QDs reveal the light absorption in visible range which increases the limited optical absorption of bulk SnO<sub>2</sub>. Notably, the iodination can further enhance the visible light absorption due to the formation of band tail states. Therefore, iodinated SnO<sub>2</sub> QDs exhibit significantly enhanced visible-light-driven photocatalytic activity toward degradation of rhodamine B and oxidation of NO in ppb level. Time-resolved spectroscopic studies reveal that the iodine species in QDs can not only server to passivate the surface traps to prolong the lifetime of the excited states when excited above the band gap, but they can also effectively absorb visible light and generate enhancement for photocatalytic reactions. The present study highlights the surface modification of wide band gap semiconductor for exploring efficient visible-light-active photocatalysts.</p>},
  author       = {Li, Pu and Lan, Yong and Zhang, Qian and Zhao, Ziyan and Pullerits, Tönu and Zheng, Kaibo and Zhou, Ying},
  issn         = {1932-7447},
  language     = {eng},
  month        = {05},
  number       = {17},
  pages        = {9253--9262},
  publisher    = {ARRAY(0x8544028)},
  series       = {Journal of Physical Chemistry C},
  title        = {Iodinated SnO<sub>2</sub> quantum dots : A facile and efficient approach to increase solar absorption for visible-light photocatalysis},
  url          = {http://dx.doi.org/10.1021/acs.jpcc.6b01530},
  volume       = {120},
  year         = {2016},
}