Please use this identifier to cite or link to this item: https://doi.org/10.1021/am303253p
Title: K-Enriched WO3 nanobundles: High electrical conductivity and photocurrent with controlled polarity
Authors: Hu, Z.
Ji, Z.
Lim, W.W.
Mukherjee, B.
Zhou, C.
Tok, E.S. 
Sow, C.-H. 
Keywords: electric conductivity
intercalated WO3
nanobundle
photocurrent
potassium
Issue Date: 12-Jun-2013
Citation: Hu, Z., Ji, Z., Lim, W.W., Mukherjee, B., Zhou, C., Tok, E.S., Sow, C.-H. (2013-06-12). K-Enriched WO3 nanobundles: High electrical conductivity and photocurrent with controlled polarity. ACS Applied Materials and Interfaces 5 (11) : 4731-4738. ScholarBank@NUS Repository. https://doi.org/10.1021/am303253p
Abstract: Potassium ions are successfully intercalated into WO3 nanobundles with the integrity of the pseudo-orthorhombic structure remaining intact. The nanobundles display a 5-fold increase in the electrical conductivity. It changes from a value of 10-4 Sm-1 for pure WO3 to 40 Sm-1 upon potassium intercalation. The electrical conductivity also increases by ∼200 times as temperature increases from 23 to 200 C whereby analysis shows a thermal activation energy of ∼1 eV. Density functional theory calculations show that K ions cause the reduction of the surrounding W atoms and lead to an increase in the electron population in the conduction band. Hence, the conductivity of the K-WO 3 nanobundles is greatly enhanced. The calculated band structure also shows a gap of 1 eV that is consistent with the measured thermal activation energy. Upon illumination of focused laser beam, individual and isolated nanobundle displays significant photon induced current (9 nA) without external bias at low laser power (2 mW); the amplitude and polarity of photocurrent could be controlled by location of laser spot. © 2013 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
URI: http://scholarbank.nus.edu.sg/handle/10635/97017
ISSN: 19448244
DOI: 10.1021/am303253p
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

10
checked on Sep 21, 2018

WEB OF SCIENCETM
Citations

10
checked on Sep 11, 2018

Page view(s)

69
checked on Sep 7, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.