Article (Scientific journals)
Straightforward prediction of the Ni1−xO layers stoichiometry by using optical and electrochemical measurements
Manceriu, Laura; Colson, Pierre; Maho, Anthony et al.
2017In Journal of Physics: D Applied Physics, 50, p. 225501 pp 1 to 12
Peer Reviewed verified by ORBi
 

Files


Full Text
Laura Manceriu J. Phys D Apl. Phys.pdf
Publisher postprint (2.55 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
nickel oxide; thin films; stoichiometry evaluation; impedance spectroscopy; optical properties
Abstract :
[en] In this study, we propose a straightforward method for x determination in sub-stoichiometric nickel oxide (Ni1−xO) films prepared by ultrasonic spray pyrolysis on fluor-tin oxide (FTO) substrates by varying the post-deposition thermal treatment. The Ni3+ concentration, the flat band potential (Φfb) and the open circuit potential (Voc) were determined by electrochemical impedance analysis in aqueous media and correlated to the transmission of Ni1−xO films. An x-ray photoelectron spectroscopy study was also performed to quantify the amount of Ni3+ in the films and compare it with the one determined by electrochemical analysis. The electrochromic behavior of the Ni1−xO films in non-aqueous electrolyte was investigated as well. With increasing Ni3+ concentration the films became more brownish and more conductive, both Voc and Φfb values increased. Calibration curves of transmission at 550 nm or open circuit potential versus carrier concentration were plotted and allowed the prediction of x in an unknown Ni1−xO sample. The Ni1−xO films characterized by the highest Ni3+ concentration have a darker colored state but lower transmission modulation, due to their reduced specific surface and increased crystallinity.
Disciplines :
Physics
Author, co-author :
Manceriu, Laura  ;  Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Colson, Pierre  ;  Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Maho, Anthony  ;  Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Eppe, Gauthier  ;  Université de Liège > Département de chimie (sciences) > Chimie analytique inorganique
Nguyen, Ngoc Duy  ;  Université de Liège > Département de physique > Physique des solides, interfaces et nanostructures
Labrugere, Christine;  CNRS, Université de Bordeaux, PLACAMAT UMS 3626, F-33600 Pessac, France
Rougier, Aline;  CNRS, Université de Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France
Cloots, Rudi ;  Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Henrist, Catherine ;  Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Language :
English
Title :
Straightforward prediction of the Ni1−xO layers stoichiometry by using optical and electrochemical measurements
Publication date :
15 May 2017
Journal title :
Journal of Physics: D Applied Physics
ISSN :
0022-3727
eISSN :
1361-6463
Publisher :
Institute of Physics
Volume :
50
Pages :
225501 pp 1 to 12
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
SMARTSPRAY project (n°1117339, Greenomat), Convention de sous-traitance n°7428
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 29 June 2017

Statistics


Number of views
118 (15 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
8
Scopus citations®
without self-citations
7
OpenCitations
 
5

Bibliography


Similar publications



Contact ORBi