Article (Scientific journals)
Electrochemical Investigation of Nitinol/Tantalum Hybrid Surfaces Modified by Alkylphosphonic Self-Assembled Monolayers
Maho, Anthony; Kanoufi, Frédéric; Combellas, Catherine et al.
2014In Electrochimica Acta, 116 (0), p. 78 - 88
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Keywords :
Nickel-titanium
Abstract :
[en] The surface characteristics of bare and modified nickel-titanium samples (NiTi) are investigated by spectroscopic, microscopic and electrochemical techniques. The successful electrodeposition of a tantalum coating on NiTi and the effective grafting of 1-dodecylphosphonic acid SAMs on both pristine and Ta-covered NiTi surfaces are evidenced and quantified by XPS and SEM. Cyclic voltammetry performed on the different NiTi-based electrodes highlights their specificities regarding electron transfer to a redox probe present in solution (here ruthenium(III) hexamine). Finally, the samples electrochemical characteristics at a local scale are investigated by scanning electrochemical microscopy (SECM). The impact of the surface modifications on mass transport of the redox probe is analyzed through approach curves in the feedback mode, while the recording of current maps in feedback as well as in substrate-generation/tip-collection modes leads to the qualitative identification of electrochemically-active areas corresponding to precursor pitting corrosion sites.
Disciplines :
Chemistry
Author, co-author :
Maho, Anthony  ;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP > Chimie > CES
Kanoufi, Frédéric;  ESPCI - Paris
Combellas, Catherine;  ESPCI - Paris
Delhalle, Joseph;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP > Chimie > CES
Mekhalif, Zineb;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP > Chimie > CES
Language :
English
Title :
Electrochemical Investigation of Nitinol/Tantalum Hybrid Surfaces Modified by Alkylphosphonic Self-Assembled Monolayers
Publication date :
2014
Journal title :
Electrochimica Acta
ISSN :
0013-4686
Publisher :
Elsevier, United Kingdom
Volume :
116
Issue :
0
Pages :
78 - 88
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 July 2014

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