Positive temperature coefficient resistance and humidity sensing properties of Cd-doped ZnO nanowires

Wan, Qing; Li, Q. H.; Chen, Y. J.; Wang, T. H.; He, Xiaoli; Gao, Xiuli; Li, J. P.

doi:10.1063/1.1707225

Cited by 170 publications

(74 citation statements)

References 19 publications

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“…Humidity sensors based on semiconductor metal oxides have attracted considerable attention due to their ease of fabrication, clear operating mechanism, high sensing response, low cost, and portability. Among them, many different nanostructures of ZnO such as nanowires, nanorods, nanoparticles, and nanofibers have been proposed as high-performance relative humidity (RH) sensors [93][94][95][96]. Following the increased interest in the investigation of the sensing properties of the 2D ZnO nanostructures, some works have been also devoted to the use of these materials as humidity sensors.…”

Section: Humiditymentioning

confidence: 99%

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

153

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Two-dimensional (2D) nanomaterials, due to their unique physical and chemical properties, are showing great potential in catalysis and electronic/optoelectronic devices. Moreover, thanks to the high surface to volume ratio, 2D materials provide a large specific surface area for the adsorption of molecules, making them efficient in chemical sensing applications. ZnO, owing to its many advantages such as high sensitivity, stability, and low cost, has been one of the most investigated materials for gas sensing. Many ZnO nanostructures have been used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases. This review summarizes most of the research articles focused on the investigation of 2D ZnO structures including nanosheets, nanowalls, nanoflakes, nanoplates, nanodisks, and hierarchically assembled nanostructures as a sensitive material for conductometric gas sensors. The synthesis of the materials and the sensing performances such as sensitivity, selectivity, response, and recovery times as well as the main influencing factors are summarized for each work. Moreover, the effect of mainly exposed crystal facets of the nanostructures on sensitivity towards different gases is also discussed.

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Section: Humiditymentioning

confidence: 99%

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

153

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“…[1,2] 1-D ZnO nanorods (NRs) and nanowires (NWs) have been synthesized using a range of techniques, [3,4,5,6,7,8] and prototype nanodevices (e.g. field-effect transistors [9] and electrical gas sensors [10]) fabricated.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Growth of ZnO Nanorods Aligned Parallel to the Substrate Surface

et al. 2008

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Hydrothermal growth of ZnO nanorods with their c-axis aligned parallel to the surface of a Si (100) wafer substrate is demonstrated. With appropriate choice of process conditions (precursor concentrations, solution temperature, growth time), the (002) face of such nanorods is seen to support the emergence of as many as 10-20 aligned ZnO nanowires, with diameters ~50 nm and lengths that can extend to several microns. Similar growth of parallel nanorods/nanowires is observed on an amorphous carbon film surface. The influence of the substrate surface on the formation of such nanostructures is discussed. Such demonstrations of nanorod/nanowire growth parallel to a substrate surface could prove helpful in future nanodevice fabrication strategies.2

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“…In the last decade, chemical sensing based on a variety of one-dimensional metal oxide nanostructures has attracted great attention [7][8][9]. Generally, nanowire sensors are based on a percolated network of nanowires [7,10].…”

Section: Introductionmentioning

confidence: 99%

Structure and humidity sensing properties of SnO₂ zigzag belts

et al. 2010

Cryst. Res. Technol.

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A novel method was developed for synthesizing ultralong SnO 2 zigzag belts with the assistance of CuO powder. The crystalline structure and morphology of SnO 2 zigzag belts were characterized using x-ray diffraction, scanning electron microscopy and transmission electron microscopy. The growth mechanism of the ultralong SnO 2 zigzag belts and the catalytic behavior of the copper were discussed. The humidity sensor based on as-synthesized product shows high sensitivity and fast response time due to unique structure of the SnO 2 zigzag belts with large surface-to-volume ratio. It can be found that the resistance of the SnO 2 materials decreases obviously with increasing relative humidity (RH) at room temperature (26 °C). The results demonstrate that these SnO 2 nanostructures are potential to be used as effective and high performance humidity sensors.

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Positive temperature coefficient resistance and humidity sensing properties of Cd-doped ZnO nanowires

Cited by 170 publications

References 19 publications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Hydrothermal Growth of ZnO Nanorods Aligned Parallel to the Substrate Surface

Structure and humidity sensing properties of SnO₂ zigzag belts

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Positive temperature coefficient resistance and humidity sensing properties of Cd-doped ZnO nanowires

Cited by 170 publications

References 19 publications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Hydrothermal Growth of ZnO Nanorods Aligned Parallel to the Substrate Surface

Structure and humidity sensing properties of SnO2 zigzag belts

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Structure and humidity sensing properties of SnO₂ zigzag belts