Synthesis of porous micro-sphere ZnO and its excellent sensing properties to acetone
Bo Xiao-Qing1 , Liu Chang-Bai2 , Li Hai-Ying1 , Liu Li1 , Guo Xin1 , Liu Zhen1 , Liu Li-Li1 , Su Chang1
1. National Laboratory of Superhard Material, College of Physics, Jilin University, Changchun 130012, China;
Abstract Porous micro-spheres of ZnO have been synthesized with Zn(NO3 )2 ·6H2 O and urea as the raw materials and hexamine as a surfactant via a hydrothermal method. Structure, morphology, specific surface area, and pore size distribution of ZnO porous micro-sphere are characterized by X-ray diffraction, scanning electron microscopy, and micromeritics ASAP 2420 apparatus, respectively. Gas sensors are fabricated from the ZnO porous micro-spheres and their gas-sensing properties are measured. The gas sensitivity of sensor samples at different temperatures to acetone gas is examined. Results show that the sensitivity of ZnO porous micro-spheres sensors to 50 ppm acetone gas is 26.8 at 280 ℃, and the response and recovery durations are 4-10 seconds, respectively. Also, the sensor possesses an excelent selectivity for acetone.
Key words ：
hydrothermal method
zinc oxide
acetone
gas sensor
Received: 2014-03-25
PACS:
68.37.Hk
(Scanning electron microscopy (SEM) (including EBIC))
68.55.-a
(Thin film structure and morphology)
81.16.Pr
(Micro- and nano-oxidation)
81.16.-c
(Methods of micro- and nanofabrication and processing)
Fund: Project supported by the Jilin Provincial Science and Technology Department, China (Grant NO. 20140204027GX), and the “Challenge Cup” College Students' Extracurricular Academic Science and Technology Works, China (Grant No. 450060497053).
Corresponding Authors:
刘丽
E-mail: liul99@jlu.edu.cn
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2014, Vol. 63 
