Title Local Modification of the Microstructure and Electrical Properties of Multifunctional Au-YSZ Nanocomposite Thin Films by Laser Interference Patterning
Authors Gries, Thomas , Catrin, Rodolphe , Migot, Sylvie , Soldera, Flavio , ENDRINO ARMENTEROS, JOSÉ LUIS, Landa-Canovas, Angel R. , Cleymand, Franck , Mangin, Denis , Muecklich, Frank , Horwat, David
External publication Si
Means ACS Appl. Mater. Interfaces
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 6.72300
SJR Impact 2.12500
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-84906810067&doi=10.1021%2fam503160w&partnerID=40&md5=be045c63e83f082c8f32525c12afbe9f
Publication date 27/08/2014
ISI 000341122000049
Scopus Id 2-s2.0-84906810067
DOI 10.1021/am503160w
Abstract Nanocomposite films consisting of gold nano-particles embedded in an yttria-stabilized zirconia matrix (Au-YSZ) have been synthesized with different gold loadings by reactive magnetron sputtering followed by ex situ annealing in air or laser interference patterning (LIP) treatment. It is shown that the electrical conductivity of the nanocomposite films can be modified to a large extent by changing the gold loading, by thermal annealing, or by LIP. The structural and microstructural analyses evidenced the segregation of metallic gold in crystalline form for all synthesis conditions and treatments applied. Thermal annealing above 400 degrees C is observed to trigger the growth of pre-existing nanoparticles in the volume of the films. Moreover, pronounced segregation of gold to the film surface is observed for Au/(Au + Zr + Y) ratios above 0.40, which may prevent the use of thermal annealing to functionalize gold-rich Au-YSZ coatings. In contrast, significant modifications of the microstructure were detected within the interference spot (spot size close to 2 x 2 mm) of LIP treatments only for the regions corresponding to constructive interference. As a consequence, besides its already demonstrated ability to modify the friction behavior of Au-YSZ films, the LIP treatment enables local tailoring of their electrical resistivity. The combination of these characteristics can be of great interest for sliding electrical contacts.
Keywords nanocomposite films; electrical conductivity; gold nanoparticles; laser interference patterning; thermal annealing; microstructure
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