Ethanol Gas Detection Using a Yolk-Shell (Core-Shell) 伪-Fe2O3 Nanospheres as Sensing Material

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• 作者：LiLi Wang ; Zheng Lou ; Jianan Deng ; Rui Zhang ; Tong Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：7
• 期：23
• 页码：13098-13104
• 全文大小：539K
• ISSN：1944-8252

文摘

Three-dimensional (3D) nanostructures of 伪-Fe₂O₃ materials, including both hollow sphere-shaped and yolk-shell (core-shell)-shaped, have been successfully synthesized via an environmentally friendly hydrothermal approach. By expertly adjusting the reaction time, the solid, hollow, and yolk-shell shaped 伪-Fe₂O₃ can be selectively synthesized. Yolk-shell 伪-Fe₂O₃ nanospheres display outer diameters of 350 nm, and the interstitial hollow spaces layer is intimately sandwiched between the inner and outer shell of 伪-Fe₂O₃ nanostructures. The possible growth mechanism of the yolk-shell nanostructure is proposed. The results showed that the well-defined bilayer interface effectively enhanced the sensing performance of the 伪-Fe₂O₃ nanostructures (i.e., yolk-shell 伪-Fe₂O₃@伪-Fe₂O₃), owing predominantly to the unique nanostructure, thus facilitated the transport rate and augmented the adsorption quantity of the target gas molecule under gas detection.