Issue 14, 2013
From the journal:

CrystEngComm

Ultra-long VO2 (A) nanorods using the high-temperature mixing method under hydrothermal conditions: synthesis, evolution and thermochromic properties†

Pengcheng Liu,a   Kongjun Zhu,*a   Yanfeng Gao,bc   Qingliu Wu,d   Jinsong Liu,a   Jinhao Qiu,a   Qilin Gua  and  Hongjuan Zhenga  

* Corresponding authors

a State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
E-mail: kjzhu@nuaa.edu.cn
Fax: +86-25-84895759
Tel: +86-25-84893466-190

b School of Materials Science and Engineering, Shanghai University, Shangda 99, Baoshan 200444, China

c State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

d Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Ave, USA

Abstract

Well-crystallized, ultra-long VO2 (A) nanorods were synthesized using a facile high-temperature mixing method (HTMM) under hydrothermal conditions. The as-obtained products were characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis-NIR, differential scanning calorimetry and Fourier transform infrared spectroscopy. The effect of W doping on the phase-transition properties of VO2 (A) was also studied. The results indicate that the optimal synthesis condition of VO2 (A) using the HTMM is hydrothermal treatment at 240 °C for 48 h with a 3 : 1 molar ratio of the reducing agent to the vanadium source. The reason why the polymorphic forms of VO2 show different colors is that the light in the visible region reflected by the samples is different. The phase-transition temperature of the pure VO2 (A) is 154.75 °C, which is significantly lower than the 162 °C reported previously. When a small amount of W is doped, VO2 (A) will be transformed into other polymorphic forms, which indicates that the crystal structure of VO2 (A) is highly sensitive to limited doping. Importantly, the as-obtained pure VO2 (A) shows good thermochromic properties and optical-switching characters. A crystal growth mechanism for VO2 (A), oriented-attachment–exfoliation–recrystallization–oriented-attachment, is proposed and described in detail.

Graphical abstract: Ultra-long VO2 (A) nanorods using the high-temperature mixing method under hydrothermal conditions: synthesis, evolution and thermochromic properties

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Article information

DOI
https://doi.org/10.1039/C3CE27085H
Article type
Paper
Submitted
23 Dec 2012
Accepted
04 Feb 2013
First published
04 Mar 2013

CrystEngComm, 2013,15, 2753-2760

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Ultra-long VO2 (A) nanorods using the high-temperature mixing method under hydrothermal conditions: synthesis, evolution and thermochromic properties

P. Liu, K. Zhu, Y. Gao, Q. Wu, J. Liu, J. Qiu, Q. Gu and H. Zheng, CrystEngComm, 2013, 15, 2753 DOI: 10.1039/C3CE27085H

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