Please use this identifier to cite or link to this item:
Title: Defect study of SnO2 nanostructures by cathodoluminescence analysis: Application to nanowires
Author: Prades García, Juan Daniel
Arbiol i Cobos, Jordi
Cirera Hernández, Albert
Morante i Lleonart, Joan Ramon
Avella, M.
Zanotti, L.
Comini, Elisabetta
Faglia, G.
Sberveglieri, Giorgio
Keywords: Detectors
Oxygen vacancy
Issue Date: 2006
Publisher: Elsevier
Abstract: Defects in SnO2 nanowires have been studied by cathodoluminescence, and the obtained spectra have been compared with those measured on SnO2 nanocrystals of different sizes in order to reveal information about point defects not determined by other characterization techniques. Dependence of the luminescence bands on the thermal treatment temperatures and pre-treatment conditions have been determined pointing out their possible relation, due to the used treatment conditions, with the oxygen vacancy concentration. To explain these cathodoluminescence spectra and their behavior, a model based on first-principles calculations of the surface oxygen vacancies in the different crystallographic directions is proposed for corroborating the existence of surface state bands localized at energy values compatible with the found cathodoluminescence bands and with the gas sensing mechanisms. CL bands centered at 1.90 and 2.20 eV are attributed to the surface oxygen vacancies 100° coordinated with tin atoms, whereas CL bands centered at 2.37 and 2.75 eV are related to the surface oxygen vacancies 130° coordinated. This combined process of cathodoluminescence and ab initio calculations is shown to be a powerful tool for nanowire defect analysis.
Note: Versió Postprint del document publicat a
It is part of: Sensors and Actuators B: Chemical, Volume 126, Issue 1, Functional Materials for Micro and Nanosystems - EMRS, Containing Selected papers from the European Materials research Society (E-MRS 2006) Symposium G:, 20 September 2007, p. 6-12
Related resource:
ISSN: 0925-4005
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

Files in This Item:
File Description SizeFormat 
EMRS-2006-D-06-00014.pdf436.96 kBAdobe PDFView/Open

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