Low concentration H₂S detection of CdO-decorated hierarchically mesoporous NiO nanofilm with wrinkle structure

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• 作者：Ting-ting YuAuthor Vitae ; Xian-Fa ZhangAuthor Vitae ; Ying-Ming XuAuthor Vitae ; Xiao-Li ChengAuthor Vitae ; Shan GaoAuthor Vitae ; Hui ZhaoAuthor Vitae ; Li-Hua Huo ; ^{lhhuo68@yahoo.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：CdO-decorated NiO film with wrinkle structure ; Hierarchically mesoporous structure ; Hydrogen sulfide sensing ; Low temperature
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：230
• 期：Complete
• 页码：706-713
• 全文大小：2442 K

文摘

CdO-decorated hierarchically mesoporous NiO nanofilm with wrinkle structure was grown in-situ on ceramic tubes via a simple hydrothermal reaction without any surfactant or template. The as-prepared nanofilm was characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and Brunauer–Emmett–Teller (BET) analyzes. It exhibits a nanoparticulate film with uniformly self-assembled wrinkles. These wrinkles are thin porous nanosheets that are further constructed by subnanometer nanoparticles. Compared with the NiO porous nanowall arrays, the 2.01 mol% CdO-decorated NiO film exhibits not only higher response to part per billion (ppb) levels (0.5–100 ppb) H₂S at low temperature (92 °C), but also higher selectivity to other reducing gases compared with pure NiO porous nanowall arrays. The lowest detection limit of the NiO film after CdO decoration decreases down to 0.5 ppb while that of pure NiO is 1 ppb. The mechanism of the enhanced H₂S sensing for 2.01 mol% Cd-decorated NiO film is also discussed in detail.