Atomic force microscopy study of nanoporous gold surface and electrochemical properties. (15th July 2019)

• Record Type: Journal Article
• Authors: Gao, Panpan; Qian, Ping; Qiao, Lijie; Volinsky, Alex A.; Su, Yanjing
• Is Part Of: Scripta materialia. Number 168(2019)
• Page Start: 1
• Page End: 4
• Publication Date: 2019-07-15
• Subjects: Nanoporous gold -- Dealloying -- Coarsening -- Atomic force microscopy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.03.044
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The morphology, surface oxide and strain evolution of nanoporous (np) gold were investigated using atomic force microscopy (AFM). Topographic AFM images show typical np structure with a few nanometers ligament size. Current sensing AFM results revealed semiconductor properties of the surface oxide, which may consist of Ag2 O (p-type) and AgO (n-type). The surface oxide can effectively suppress the np structure coarsening. In-situ electrochemical AFM tests exhibit a refined macroscopic dimensional change of 40 nm within 0.35–0.7 V potential range. AFM can be used as an effective method to investigate the morphology and voltage-induced dimension changes in electrolyte. Graphical abstract: AFM topography images of (a) the initial prepared npg and (b) the reduced npg samples.Unlabelled Image