Fabrication of Novel Nanoporous Films in Moisture-in-Oil Sensors via Chemical Dealloying of Cu-Cr using Combinatorial Search of Cu–Cr Alloy Compositions. (19th February 2018)

• Record Type: Journal Article
• Authors: Yoshii, Yusuke; Sakurai, Junpei; Mizoshiri, Mizue; Hata, Seiichi
• Is Part Of: MRS advances. Volume 3:Number 4(2018)
• Page Start: 225
• Page End: 232
• Publication Date: 2018-02-19
• Subjects: nanostructure, -- thin film, -- combinatorial synthesis; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2018.198
• Languages: English
• ISSNs: 2059-8521

Abstract

ABSTRACT: An as-deposited film with a Cr compositional gradient (22–15 at.% Cr) was immersed in 22.5% HNO3 for 15 hours. In the part of the film with initial Cr content in the range of 22–18 at.%, Cu dealloying resulted in sufficient Cu dealloying (final Cr content = 33–80 at.%) without film dissolution. Using the film with optimal initial composition Cu82 Cr18, we successfully fabricated a nanoporous film with a pore size in the range of 20–40 nm. As a result of the formation of Cr2 O3 during dealloying, this film was transparent and exhibited an insulation state. The novel nanoporous film is expected to be applied as a nanofilter in moisture-in-oil sensors.