Facile and accelerated production of RuO2 monolayers via a dual-step intercalation process. Issue 6 (26th February 2020)

• Record Type: Journal Article
• Authors: Kim, Se Yun; Shin, Weon Ho; Jung, Doh Won; Ko, Dong-Su; Roh, Jong Wook; Hwang, Sungwoo; Lee, Jongmin; Lee, Kimoon; Park, Hee Jung; Kwak, Chan; Kim, Sang-il; Jeong, Hyung Mo; Lee, Kyu Hyoung; Kim, Hyun Sik
• Is Part Of: Inorganic chemistry frontiers. Volume 7:Issue 6(2020)
• Page Start: 1445
• Page End: 1450
• Publication Date: 2020-02-26
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9qi01678c
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : RuO2 monolayer nanosheets were prepared by a rapid and efficient dual step exfoliation process. Abstract : Tetrabutylammonium ions (TBA + ) have commonly been used to exfoliate RuO2 into monolayers via ion exchange reactions. However, the low production yield of RuO2 exfoliation, which originates from the large molecular size of TBA +, limits wider utilisation of RuO2 monolayers in optoelectronic applications. We introduce a rapid and efficient dual-step exfoliation process beginning with intercalation of small organic molecules (tetramethylammonium ions) into RuO2, which is followed by the addition of TBA + as a second intercalant to realize RuO2 monolayer production. Our dual-step intercalation process increases the RuO2 monolayer exfoliation yield from 9.9% to 60% after 14 days. Density functional theory calculations reveal that the activation energy of dual-step intercalation is much lower than that of direct intercalation of TBA + ions into the RuO2 structure. The experimental and theoretical results of dual-step intercalation suggest that it is a facile and general approach for the production of metal oxide monolayers, and could widen the use of metal oxide monolayer nanosheets.