High-sensitivity NO2 gas sensors based on flower-like and tube-like ZnO nanomaterials

Chen, Mei; Wang, Zhihua; Han, Dongmei; Gu, Fubo; Guo, Guangsheng

doi:10.1016/j.snb.2011.05.023

Cited by 184 publications

(104 citation statements)

References 46 publications

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“…The highest response to NO 2 was observed at a temperature of 150 °C, followed by 300 °C, 250 °C, and 200 °C ( Figure 6(B)). The temperature dependence of the NO 2 sensitivity to ZnO was determined via the gas adsorption process, wherein the pre-adsorption of oxygen has an important function [36].…”

Section: Figure 4 Investigation Of Crystal Structure and Optical Promentioning

confidence: 99%

Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors

Nguyen

Quy

Hòa

et al. 2014

Sensors and Actuators B: Chemical

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Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors. Chemical, http://dx.doi. org/10.1016/j.snb.2013.11.043 Access to the published version may require subscription. N.B. When citing this work, cite the original published paper. Sensors and actuators. B, Abstract:The proper engineering design of gas sensors and the controlled synthesis of sensing materials for the high-performance detection of toxic gas are very important in the fabrication of handheld devices. In this study, an effective design for gas sensor chips is developed to control the formation of grown ZnO nanowires (NWs). The design utilizes the dendrite islands of Au catalyst deposited on and between Pt electrodes of a planar-type micro gas sensor so that NWs can grow on instead of a continuous Au seed layer. This method results in an increase of NW-NW junctions on the device and also eliminates current leakage through the seed layer, which results in a higher sensitivity. The results show that the developed gas-sensing devices could be used to monitor NO 2 at moderate temperature (~250 °C) and/or ethanol at a high temperature (~400 °C).

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Section: Figure 4 Investigation Of Crystal Structure and Optical Promentioning

confidence: 99%

Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors

Nguyen

Quy

Hòa

et al. 2014

Sensors and Actuators B: Chemical

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“…4 Tube-like ZnO solvothermal nanostructures synthesized at 150°C have a response of approximately 350 to 11.5 ppm NO 2 at 190°C. 5 Pencil-like ZnO nanorods, obtained via cetrimonium bromide (CTAB)-assisted hydrothermal process at 90°C, have a highest response of 206 to 40 ppm NO 2 at 400°C. 6 Many other similar studies were performed using ZnO one-dimensional (1D) nanostructures for NO 2 sensing.…”

Section: Introductionmentioning

confidence: 99%

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

Jiao

Duy

Trung

et al. 2017

Journal of Elec Materi

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Three different ZnO nanostructures, dense nanorods, dense nanowires, and sparse nanowires, were synthesized between Pt electrodes by on-chip hydrothermal growth at 90°C and below. The three nanostructures were characterized by scanning electron microscopy and x-ray diffraction to identify their morphologies and crystal structures. The three ZnO nanostructures were confirmed to have the same crystal type, but their dimensions and densities differed. The NO 2 gas-sensing performance of the three ZnO nanostructures was investigated at different operation temperatures. ZnO nanorods had the lowest response to NO 2 along with the longest response/recovery time, whereas sparse ZnO nanowires had the highest response to NO 2 and the shortest response/recovery time. Sparse ZnO nanowires also performed best at 300°C and still work well and fast at 200°C. The current-voltage curves of the three ZnO nanostructures were obtained at various temperatures, and the results clearly showed that sparse ZnO nanowires did not have the linear characteristics of the others. Analysis of this phenomenon in connection with the highly sensitive behavior of sparse ZnO nanowires is also presented.

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“…In recent years, ZnO nanowires or similar morphologies have been investigated and proposed especially as hydrogen [28], acetone [9, 59,60], ammonia, ethanol [11,13,14,61], hydrogen sulfide [62], nitrogen dioxide [10,13,63], and ozone [12] sensors. Nevertheless, only a few of these studies have been made considering the real working conditions of a sensor during the functional characterizations; we will report the ones we consider more interesting.…”

Section: Functional Propertiesmentioning

confidence: 99%

“…Chen et al studied the sensing properties of flower and tube-like ZnO nanostructures, even though the gas test system is a static one, the background gas used was air; perhaps most interesting are the drift experiments that were correlated with the sensing properties [10]. An NO 2 sensing mechanism was studied, and the authors found that it included electron transfer on donor sites and/or the participation of surface oxygen species to form nitrate species.…”

Section: Functional Propertiesmentioning

confidence: 99%

ZnO Quasi-1D Nanostructures: Synthesis, Modeling, and Properties for Applications in Conductometric Chemical Sensors

2016

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Abstract:One-dimensional metal oxide nanostructures such as nanowires, nanorods, nanotubes, and nanobelts gained great attention for applications in sensing devices. ZnO is one of the most studied oxides for sensing applications due to its unique physical and chemical properties. In this paper, we provide a review of the recent research activities focused on the synthesis and sensing properties of pure, doped, and functionalized ZnO quasi-one dimensional nanostructures. We describe the development prospects in the preparation methods and modifications of the surface structure of ZnO, and discuss its sensing mechanism. Next, we analyze the sensing properties of ZnO quasi-one dimensional nanostructures, and summarize perspectives concerning future research on their synthesis and applications in conductometric sensing devices.

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High-sensitivity NO2 gas sensors based on flower-like and tube-like ZnO nanomaterials

Cited by 184 publications

References 46 publications

Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors

Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

ZnO Quasi-1D Nanostructures: Synthesis, Modeling, and Properties for Applications in Conductometric Chemical Sensors

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