Hydrothermal synthesis of ZnO whiskers from ɛ-Zn(OH)2 in NaOH/Na2SO4 solution--颗粒学报PARTICUOLOGY

Yang, L., Wang, J., & Xiang, L. (2015). Hydrothermal synthesis of ZnO whiskers from ɛ-Zn(OH)2 in NaOH/Na2SO4 solution. Particuology, 19, 113–117. https://doi.org/10.1016/j.partic.2014.06.010

Hydrothermal synthesis of ZnO whiskers from ɛ-Zn(OH)₂ in NaOH/Na₂SO₄ solution

Lining Yang, Jing Wang, Lan Xiang^*

Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2014.06.010

Volume 19, April 2015, Pages 113-117

Received 20 April 2014, Accepted 7 June 2014, Available online 22 October 2014.

E-mail: xianglan@mail.tsinghua.edu.cn

Highlights

• High-aspect-ratio ZnO whiskers were hydrothermally synthesized in NaOH–Na₂SO₄ solutions.

• The influence of Na₂SO₄ on the formation of ZnO whiskers was investigated.

• Adsorption of SO₄²⁻ mainly on (1 0 0) plane promoted 1D growth of ZnO whiskers along c-axis.

Abstract

The influence of Na₂SO₄ on the formation of ZnO whiskers was investigated in this paper. ZnO whiskers with aspect ratios of up to 50 were synthesized by dissolving ɛ-Zn(OH)₂ precursor in NaOH/Na₂SO₄ solution at room temperature, followed by aging of the resulting solution at 140 °C for 6 h. Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy analyses revealed that SO₄²⁻ ions were primarily adsorbed on the (1 0 0) plane of the ZnO whiskers via an outer-sphere complex configuration (O—H···O), thereby promoting the one-dimensional growth of ZnO whiskers along the c-axis.

Graphical abstract

Keywords

ZnO whisker; Hydrothermal; ɛ-Zn(OH)₂; Na₂SO₄; Outer-sphere complex

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