Nanoporous metals from thermal decomposition of transition metal dichalcogenides. (1st February 2020)

• Record Type: Journal Article
• Authors: Chatterjee, Swarnendu; Anikin, Anton; Ghoshal, Debjit; Hart, James L.; Li, Yawei; Intikhab, Saad; Chareev, D.A.; Volkova, O.S.; Vasiliev, A.N.; Taheri, Mitra L.; Koratkar, Nikhil; Karapetrov, Goran; Snyder, Joshua
• Is Part Of: Acta materialia. Volume 184(2020)
• Page Start: 79
• Page End: 85
• Publication Date: 2020-02-01
• Subjects: Nanoporous metal -- Dealloying -- Nanoporosity -- Transition metal dichalcogenides; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2019.11.018
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Nanoporous metals (np-M) have emerged as promising materials owing to their high surface area-to-volume ratio and electrical/thermal conductivity. There exists a group of processing methodologies by which np-M are formed through a top-down nanostructure evolution driven by the selective removal of a sacrificial component, all of which are a variation of dealloying. Nanoporosity evolution through current dealloying methodologies, however, is governed by strict requirements including sufficient separation in "reactivity" of the participating components and a homogeneous solid solution precursor alloy. This limits the viable alloy systems that may be used and the range of np-M's that may be formed. Here, we report thermal decomposition of crystalline transition metal dichalcogenides (TMDs) as a new processing methodology for np-M formation, adding to the spectrum of dealloying protocols. We demonstrate application of this process to the formation of a broader class of np-M including W, Re, Mo, and Ta with feature sizes below 100 nm. The presented facile thermal treatment of TMDs offers a new methodology for the evolution of nanoporosity in a broad range of metals. Graphical abstract: Image, graphical abstract