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This content will become publicly available on April 10, 2019

Title: Reconfigurable Vanadium Dioxide Nanomembranes and Microtubes with Controllable Phase Transition Temperatures

Here, two additional structural forms, free-standing nanomembranes and microtubes, are reported and added to the vanadium dioxide (VO 2) material family. Free-standing VO 2 nanomembranes were fabricated by precisely thinning as-grown VO 2 thin films and etching away the sacrificial layer underneath. VO 2 microtubes with a range of controllable diameters were rolled-up from the VO 2 nanomembranes. When a VO 2 nanomembrane is rolled-up into a microtubular structure, a significant compressive strain is generated and accommodated therein, which decreases the phase transition temperature of the VO 2 material. The magnitude of the compressive strain is determined by the curvature of the VO 2 microtube, which can be rationally and accurately designed by controlling the tube diameter during the rolling-up fabrication process. The VO 2 microtube rolling-up process presents a novel way to controllably tune the phase transition temperature of VO 2 materials over a wide range toward practical applications. Furthermore, the rolling-up process is reversible. A VO 2 microtube can be transformed back into a nanomembrane by introducing an external strain. Because of its tunable phase transition temperature and reversible shape transformation, the VO 2 nanomembrane-microtube structure is promising for device applications. As an example application, a tubular microactuatormore » device with low driving energy but large displacement is demonstrated at various triggering temperatures.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ; ORCiD logo [1]
  1. Fudan Univ., Shanghai (People's Republic of China)
  2. Univ. of Illinois at Chicago, Chicago, IL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 5; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; actuator; microtubes; nanomembranes; phase transition; Strain engineering; vanadium dioxide
OSTI Identifier:
1461508