期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 27, 页码 23107-23118出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b03702
关键词
CNT; ZnO tetrapod; hybrid; networks; microsensor; ammonia sensor
资金
- Alexander von Humboldt Foundation [3-3MOL/1148833 STP]
- German Research Foundation (Deutsche Forschungsgemeinschaft (DFG) [SFB 1261 AS]
- DFG [AD183-17/1]
- EU in the framework of the Graphene Flagship
- Project Institutional - Government of the Republic of Moldova [45inst-15.817.02.29A]
- STCU [6229]
Highly porous hybrid materials with unique high-performance properties have attracted great interest from the scientific community, especially in the field of gas-sensing applications. In this work, tetrapodal-ZnO (ZnO-T) networks were functionalized with carbon nanotubes (CNTs) to form a highly efficient hybrid sensing material (ZnO-T CNT) for ultrasensitive, selective, and rapid detection of ammonia (NH3) vapor at room temperature. By functionalizing the ZnO-T networks with 2.0 wt % of CNTs by a simple dripping procedure, an increase of 1 order of magnitude in response (from about 37 to 330) was obtained. Additionally, the response and recovery times were improved (by decreasing them from 58 and 61 s to 18 and 35 s, respectively). The calculated lowest detection limit of 200 ppb shows the excellent potential of the ZnO-T CNT networks as NH3 vapor sensors. Room, temperature operation of such networked ZnO-CNT hybrid tetrapods shows an excellent long-time stability of the fabricated sensors. Additionally, the gas-sensing mechanism porosity of the used three-dimensional networks and the excellent conductivity of the CNTs. On top of that, several single hybrid microtetrapod-based devices were fabricated (from samples with 2.0 wt % CNTs) with the help of the local metal deposition function of a focused ion beam/scanning electron microscopy instrument. The single microdevices are based on tetrapods with arms having a diameter of around 0.35,mu m and show excellent NH3 sensing performance with a gas response (I-gas/I-air) of 6.4. Thus, the fabricated functional networked ZnO-CNT hybrid tetrapods will allow to detect ammonia and to quantify its concentration in automotive, environmental monitoring, chemical industry,, and medical diagnostics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据