Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/42819
Title: | Hydrothermal Synthesis of Monoclinic VO2 Microparticles without Use of Hazardous Reagents: A Key Role for the W‑Dopant | Authors: | Timmers , Kimberly Chote, Alisha Leufkens, Luc Habets, Roberto ELEN, Ken Verheijen, Marcel A. VAN BAEL, Marlies MANN, Daniel BUSKENS, Pascal |
Issue Date: | 2024 | Publisher: | AMER CHEMICAL SOC | Source: | INORGANIC CHEMISTRY, 63 (12) , p. 5400 -5413 | Abstract: | Monoclinic vanadium dioxide (VO2 (M)) is a promising material for various applications ranging from sensing to signature management and smart windows. Most applications rely on its reversible structural phase transition to rutile VO2 (VO2 (R)), which is accompanied by a metal-to-insulator transition. Bottom-up hydrothermal synthesis has proven to yield high quality monoclinic VO(2)but requires toxic and highly reactive reducing agents that cannot be used outside of a research lab. Here, we present a new hydrothermal synthesis method using nontoxic and safe-to-use oxalic acid as a reducing agent for V2O5 to produce VO2 (M). In early stages of the process, polymorphs VO2 (A) and VO2 (B) were formed, which subsequently recrystallized to VO2 (M). Without the presence of W6+, this recrystallization did not occur. After a reaction time of 96 h at 230 C-degrees in the presence of (NH4)(6)H(2)W(12)O(40 )in Teflon-lined rotated autoclaves, we realized highly crystalline, phase pure W-doped VO2 (M) microparticles of uniform size and asterisk shape (Delta H = 28.30 J center dot g(-1), arm length = 6.7 +/- 0.4 mu m, arm width = 0.46 +/- 0.06 mu m). We extensively investigated the role of W6+ in the kinetics of formation of VO2 (M) and the thermodynamics of its structural phase transition. | Notes: | Mann, D; Buskens, P (corresponding author), Netherlands Org Appl Sci Res TNO, NL-5656 AE Eindhoven, Netherlands. daniel.mann@tno.nl; pascal.buskens@tno.nl |
Document URI: | http://hdl.handle.net/1942/42819 | ISSN: | 0020-1669 | e-ISSN: | 1520-510X | DOI: | 10.1021/acs.inorgchem.3c03999 | ISI #: | 001186342500001 | Rights: | 2024 American Chemical Society | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
ee.pdf Restricted Access | Published version | 14.59 MB | Adobe PDF | View/Open Request a copy |
zz.pdf | Peer-reviewed author version | 5.32 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.