Facile synthesis of perfect ZnSn(OH)<sub>6</sub> octahedral microcrystallines with controlled size and high sensing performance towards ethanol

doi:10.1007/s11706-018-0423-2

Front. Mater. Sci.

2018, Vol. 12

Issue (2) : 176-183 https://doi.org/10.1007/s11706-018-0423-2

RESEARCH ARTICLE

Facile synthesis of perfect ZnSn(OH)₆ octahedral microcrystallines with controlled size and high sensing performance towards ethanol

Shaoming SHU, Chao WANG, Shantang LIU(

)

School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor &Green Chemical Technology, Wuhan Institute of Technology, Wuhan 430073, China

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Abstract

Uniform and monodisperse ZnSn(OH)₆ perfect octahedrons have been synthesized by a facile coprecipitation reaction process. The particle size of the as-prepared ZnSn(OH)₆ octahedral structure can be readily controlled by adjusting the reaction temperature (T), the side length of ZnSn(OH)₆ octahedrons tailored from 3 µm (40°C) to 4 µm (60°C) and 5 µm (80°C). The ethanol sensing properties of the ZnSn(OH)₆ octahedrons were carefully investigated. The gas sensing experimental data show that the sensor based on ZnSn(OH)₆ (40°C) show good selectivity, fast response/recovery time and the highest response (R_a/R_g = 23.8) to 200 ppm ethanol at relatively low optimum operating temperature (200°C) among sensors based on ZnSn(OH)₆ (60°C) and ZnSn(OH)₆ (80°C), which might result from different specific surface areas. The study demonstrated that perfect octahedral ZnSn(OH)₆ with controlled crystalline size and desirable sensing performance can be synthesized with a simple fabrication procedure, and the octahedral ZnSn(OH)₆ could be a highly promising material for high-performance sensors.

Keywords ZnSn(OH)₆ octahedron gas sensor ethanol

Corresponding Author(s): Shantang LIU

Online First Date: 18 May 2018 Issue Date: 29 May 2018

Cite this article:

Shaoming SHU,Chao WANG,Shantang LIU. Facile synthesis of perfect ZnSn(OH)₆ octahedral microcrystallines with controlled size and high sensing performance towards ethanol[J]. Front. Mater. Sci., 2018, 12(2): 176-183.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-018-0423-2
https://academic.hep.com.cn/foms/EN/Y2018/V12/I2/176

Fig.1 (a) XRD patterns of ZHS obtained at different reaction temperatures. (b) The FTIR spectrum of ZHS (80°C).

Fig.2 SEM images of the as-prepared ZHS octahedrons obtained at different reaction temperatures: (a) 40°C; (b) 60°C; (c) 80°C. SEM images of the ZHS (80°C) obtained at different reaction times: (d) 15 min; (e) 45 min; (f) 2 h. (g) Schematic illustration for the formation of ZHS (80°C) via the Ostwald ripening law.

Fig.3 (a) Low-resolution TEM image of ZHS (80°C). (b)(c) HRTEM images of the ZHS (80°C) octahedral at different parts. (d) SAED pattern of the ZHS (80°C).

Tab.1 Surface area of octahedral ZHS composites with different particle sizes

Fig.4 N₂ adsorption–desorption isotherms and the pore size distribution (inset) of the products: (a) ZHS (40°C); (b) ZHS (60°C); (c) ZHS (80°C).

Fig.5 (a) Responses of the ZHS-based sensors to 200 ppm ethanol at varied operating temperatures. (b) The response of ZHS-based sensors to different ethanol concentrations at their respective optimal temperature. (c) Dynamic response transients to ethanol with the increasing concentration and dynamic response variation of ZHS (40°C) sensor to 100 ppm ethanol at 200°C.

Tab.2 Comparison of ZHS-based gas sensors towards ethanol reported before and in this work

Fig.6 (a) The stability of ZHS sensors to ethanol at 200°C. (b) The response of the ZHS (40°C)-based sensor to 200 ppm of different test gases at 200°C.

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