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Title: Exfoliation of titanium oxide powder into nanosheets using hydrothermal reaction and its reassembly into flexible papers for thin-film capacitors

We have discovered a methodology to realize the fabrication of flexible metal oxide film using two-dimensional (2D) nanosheets. Atomic scale titanium oxide (TiO{sub x}) nanosheets were exfoliated from bulk TiO{sub x} powder that had a layered structure via the modified Sasaki’s method. The vacuum-assisted filtration generates films with laterally aligned TiO{sub x} nanosheets. The 2D sheet-like structure and hydrophilic nature of TiO{sub x} nanosheets enables the film consisting of TiO{sub x} nanosheets to be bendable. Also, we demonstrate the fabrication of electrochemical capacitors using this film. The mechanically flexible metal oxide film is expected to open up the possibility of fabricating flexible energy storage devices from 2D metal oxide nanosheets. - Graphical abstract: The modified Sasaki’s method, combined process of hydrothermal reaction and bulky ion exchange, enables to obtain TiO{sub x} monolayer nanosheets. The vacuum-assisted filtration generates bendable films with laterally aligned TiO{sub x} nanosheets. Also, we demonstrate the fabrication of electrochemical capacitors using this film. - Highlights: • TiO{sub x} single sheets, a novel 2-dimensional material, were exfoliated from bulk powders via the modified Sasaki’s method. • In our method, the acid treatment of TiO{sub x} bulk powders was simply modified by applying the hydrothermal reaction. • Then, themore » delamination procedures of large cation exchange were conducted following the method proposed by Sasaki et al. • Reassembly of TiO{sub x} sheets into flexible free-standing films was simply achieved via vacuum assisted filtration method. • TiO{sub x} films were used as a flexible supercapaictor electrode material.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2]
  1. Department of Materials Science and Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of)
  2. Department of Organic and Nano Engineering, Hanyang University, Seoul, 133-791 (Korea, Republic of)
  3. Department of Energy Engineering, Hanyang University, Seoul, 133-791 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22475560
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 224; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CAPACITORS; ELECTROCHEMISTRY; ELECTRODES; ENERGY STORAGE; FABRICATION; FILTRATION; HYDROTHERMAL SYNTHESIS; ION EXCHANGE; METALS; NANOSTRUCTURES; POWDERS; SHEETS; THIN FILMS; TITANIUM OXIDES; TWO-DIMENSIONAL SYSTEMS