ZnO MICRORODS SURFACE-DECORATED BY WO3 NANORODS FOR ENHANCING NH3 GAS SENSING PERFORMANCE

Nguyen Dac Dien

Abstract


Regularly shaped, single-crystalline ZnO microrods (MRs) with wurtzite structure were prepared via a wet chemical method. The obtained rods possess average diameter and length of 350 nm and 3.5 μm, respectively. Besides, WO3 nanorods (NRs) with the size of 20 nm in diameter and 120 nm in length were synthesized by hydrothermal route. A facile solid state reaction route was employed to synthesize the WO3/ZnO structure by grinding WO3 NRs powder and ZnO MRs powder with various weight ratios (1:2, 1:1 and 2:1) together at room temperature without any surfactant and template. WO3 NRs were sprinkled on ZnO MRs surface and it was observed that the amount of WO3 significantly affected the overall surface of ZnO MRs. Furthermore, NH3 gas-sensing property of the obtained products were studied and compared with that of sole ZnO MRs sample. The results demonstrated that the sensors based on WO3/ZnO structures possessed larger response, better selectivity, faster response/recovery than the sensor based on pure ZnO MRs. Especially, the gas sensing property of the WO3/ZnO composite based sensor with weight ratio of 1:1 was superior to others. However, the operating temperature is quite high (400 C). The mechanism of gas sensing was also studied.


Keywords


WO3/ZnO composite, NH3 gas sensor, hydrothermal treatment.

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DOI: https://doi.org/10.15625/2525-2518/54/1A/11820 Display counter: Abstract : 168 views. PDF : 118 views.

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Published by Vietnam Academy of Science and Technology