A facile method for the fabrication of element doped VO2 microtube arrays. (February 2021)

• Record Type: Journal Article
• Authors: Li, Zijian; Liu, Xueying; Li, Weiya; Ma, Shuxiang; Li, Na; Zhao, Chunwang
• Is Part Of: Vacuum. Volume 184(2021)
• Publication Date: 2021-02
• Subjects: VO2 -- Doping -- Thermal oxidation -- Phase transition; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.109903
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: A high-yield fabrication method for element doped VO2 microtube arrays is proposed, which has a facile procedure. Two transition metals (TM) of Ti and Zr were adopted as dopants for confirming the availability of the fabrication method. The starting materials are V-TM alloys that were prepared by vacuum arc melting. The TM-doped VO2 microtube arrays can grow in tens of seconds via a thermal oxidation process based on resistive heating of the V-TM alloy foil in air. The TM-doped VO2 microtube arrays are shown to have sharp temperature-driven reversible metal−insulator phase transitions. A growth mechanism is proposed based on the top concave effect and the wetting assisted growth mechanism. Highlights: A facile fabrication method for element doped VO2 microtube arrays is developed. Ti- and Zr-doped VO2 microtube arrays were fabricated successfully. The growth of element doped VO2 microtube arrays only needs tens of seconds. Metal–insulator and insulator–insulator two-step phase transition is revealed. A growth mechanism of element doped VO2 microtube arrays is proposed.