Lotus pollen derived 3-dimensional hierarchically porous NiO microspheres for NO₂ gas sensing

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• 作者：Kuan TianAuthor Vitae ; Xiao-Xue WangAuthor Vitae ; Hua-Yao LiAuthor Vitae ; Reddeppa NadimicherlaAuthor Vitae ; Xin Guo ; ^{xguo@hust.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Hierarchical nanostructure ; Lotus pollen ; NiO ; Chemical bath deposition ; NO2
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：227
• 期：Complete
• 页码：554-560
• 全文大小：2680 K

文摘

Hierarchically porous NiO microspheres with interconnected nano-pores were prepared with chemical bath deposition by using lotus pollens as bio-templates. The NiO microspheres thus derived have a specific surface area of 95.58 m²/g and the average pore size is 20.98 nm, such a nanostructure is ideal for gas sensing. To enhance the performances, the NiO microspheres were further decorated with Pd/PdO, and the sensor based on the Pd-decorated NiO microspheres demonstrated a high sensitivity (S = 203), fast response/recovery (73 s/169 s) and excellent selectivity to 1.8 ppm NO₂ gas at 250 °C. Compared with the other NO₂ gas sensors based on NiO reported in previous works, the sensitivity of the NO₂ sensor of this work is the highest and the response/recovery is among the fastest.