Facile synthesis and ultrahigh ethanol response of hierarchically porous ZnO nanosheets
Facile synthesis and ultrahigh ethanol response of hierarchically porous ZnO nanosheets
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DOI：
10.1016/j.snb.2011.10.021
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发表时间：
2012-01
影响因子：
8.4
通讯作者：
Le-xin Zhang;Jianghong Zhao;Haiqiang Lu;Li Li-Li;Jianfeng Zheng;Hui Li;Zhenping Zhu
中科院分区：
文献类型：
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作者：
Le-xin Zhang;Jianghong Zhao;Haiqiang Lu;Li Li-Li;Jianfeng Zheng;Hui Li;Zhenping Zhu
以碱式碳酸锌为前驱体，采用低温水热法合成了氧化锌纳米片。纳米片是具有六方纤锌矿和介孔结构的单晶。基于ZnO纳米片的气敏元件在400°C下对0.01- 1000 ppm（ppm）乙醇具有良好的选择性和稳定性。极低浓度的乙醇（低至10 ppb（十亿分之一））可以很容易地被检测到（S=3.05±0.21），这是迄今为止在单侧加热气体传感器中使用纯ZnO作为敏感材料对乙醇的最低检测限。ZnO优异的乙醇传感性能，特别是ppb级的响应，主要归功于其新颖的分级结构，具有大的比表面积、丰富的介孔、单晶结构、片层之间的平面接触、三维网络结构和厚度小的特点。
Zinc oxide (ZnO) nanosheets were successfully synthesized through a facile, economic, and low-temperature hydrothermal process, followed by annealing of the zinc carbonate hydroxide hydrate precursors. The nanosheets are single crystals with hexagonal wurtzite and mesoporous structures. Gas sensors based on these ZnO nanosheets exhibited ultrahigh response, fast response–recovery, and good selectivity and stability to 0.01–1000ppm (parts per million) ethanol at 400°C. Extremely low concentration ethanol (down to 10ppb (parts per billion)) can be readily detected (S=3.05±0.21), which is the lowest detection limit to ethanol utilizing pure ZnO as sensing materials in a one-side heated gas sensor hitherto. The excellent ethanol-sensing performance of ZnO, particularly the ppb-level response, is mainly attributed to its novel hierarchical structure, which has a large specific surface area, abundant mesopores, single-crystal structure, plane-contact between sheets, three-dimensional network architecture, and characteristically small thickness.