Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 106, Issue -, Pages 180-186Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2018.10.039
Keywords
Hydrothermal; ZnO hemispheres; ZnO/Au heterojunction; Gas sensor; Triethylamine
Funding
- National Natural Science Foundation of China [51402123]
- Shenzhen Gangchuang Building Material Co., Ltd.
- National Training Program of Innovation and Entrepreneurship for Undergraduates [201710427048]
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In this paper, we focused on the hydrothermal synthesis of ZnO structures with varied morphologies by finely adjusting the ratio of water to glycol, indicating the polarity of the solution affects the growth habit of the crystal. It showed that the precise control in growth rates of different ZnO crystal faces in mixed solution is the key factor to control the morphologies of ZnO samples. Compared to pure ZnO, the response value of the hemispherical ZnO/Au to 100 ppm triethylamine (TEA) has been improved to 104.8 at the operating temperature of 260 degrees C, and the response and recovery time are 5 and 2 s, respectively. The enhancing mechanism of as-prepared ZnO/Au hemispheres can be ascribed to the combination of the tuning of surface electron transfer, microstructures, and the electronic and chemical sensitization of Au nanoparticles, along with the formation of Schottky junction between Au nanoparticles and ZnO hemispheres. The excellent sensing performance of ZnO/Au composite hemispheres enables them to function as promising materials for actual application in the monitoring and detecting of TEA.
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