Synthesis of Nestlike ZnO Hierarchically Porous Structures and Analysis of Their Gas Sensing Properties

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• 作者：Xinzhen Wang ; Wei Liu ; Jiurong Liu ; Fenglong Wang ; Jing Kong ; Song Qiu ; Cuizhu He ; Liqiang Luan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：February 22, 2012
• 年：2012
• 卷：4
• 期：2
• 页码：817-825
• 全文大小：627K
• 年卷期：v.4,no.2(February 22, 2012)
• ISSN：1944-8252

文摘

Nestlike 3D ZnO porous structures with size of 1.0鈥?.0 渭m have been synthesized through annealing the zinc hydroxide carbonate precursor, which was obtained by a one-pot hydrothermal process with the assistance of glycine, Na₂SO₄, and polyvinyl pyrrolidone (PVP). The nestlike 3D ZnO structures are built of 2D nanoflakes with the thickness of ca. 20 nm, which exhibit the nanoporous wormhole-like characteristic. The measured surface area is 36.4 m²g^鈥? and the pore size is ca. 3鈥?0 nm. The unique nestlike 3D ZnO porous structures provided large contacting surface area for electrons, oxygen and target gas molecules, and abundant channels for gas diffusion and mass transport. Gas sensing tests showed that the nestlike 3D ZnO porous structures exhibit excellent gas sensing performances such as high sensitivity and fast response and recovery speed, suggesting the potential applications as advanced gas sensing materials.

Keywords:

zinc oxide; nanoporous; nestlike structures; gas sensing; hydrothermal method