Abstract
This study elucidates the fabrication and performance evaluation of mesoporous Zn/Al-layered double hydroxide (LDH) for nitrogen dioxide (NO2) efficient room temperature (RT) gas sensor through two-steps solution processed. The correlation between the microstructural analysis and gas sensing performance evaluation was clearly investigated. In detail, average porosity and surface area enhancement from 19.4 to 56.6 nm and 27.50 to 47.85 (m2/g) were perceived for molar ratios of 3:1 and 7:1 of Zn2+ to Al3+, respectively. This in turn resulted in gas sensor response enhancement from 10.21 to 16.41 % for the optimum device (molar ratio of 7:1) under gas concentration of 100 ppm. Continuously, the fabricated devices responded linearly to the applied gas concentration alteration wherein R2 average value of 0.995 was attained. In conjunction, the time-resolved characteristics revealed considerably fast response time along comparatively longer recovery window wherein the average rise/fall periods were estimated to be 2.98 and 19.3 sec., respectively.
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