Synthesis of ZnO–Ag Hybrids and Their Gas-Sensing Performance toward Ethanol

Ding, Jing; Zhu, Junwu; Yao, Ping; Li, Jin; Bi, Hongyan; Wang, Xin

doi:10.1021/acs.iecr.5b01711

Cited by 74 publications

(47 citation statements)

References 42 publications

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“…The surface of the ZnO nanostructure is normally terminated by oxygen species in the air. 20,21 The type of adsorbed oxygen species depends on temperature, 18,22 as described in four steps below. …”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Recently, Cho et al demonstrated a patterned p-type polycrystalline MOS nanowire array with an improved sensitivity and response time toward various volatile organic compounds (VOCs) [23], and Katwal et al fabricated a novel zinc oxide nanowire–nanotube hybrid-based sensor with a good response to specific VOCs that serve as markers for breast cancer [24]. Similarly, various other studies demonstrated the outstanding sensing potential of MOS technology for VOC detection [25,26,27]. Still, the MOS technology operates at elevated temperatures that lead to high power consumption and complicated device assembly.…”

Section: Introductionmentioning

confidence: 99%

The Electrostatically Formed Nanowire: A Novel Platform for Gas-Sensing Applications

Shalev

2017

Sensors

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The electrostatically formed nanowire (EFN) gas sensor is based on a multiple-gate field-effect transistor with a conducting nanowire, which is not defined physically; rather, the nanowire is defined electrostatically post-fabrication, by using appropriate biasing of the different surrounding gates. The EFN is fabricated by using standard silicon processing technologies with relaxed design rules and, thereby, supports the realization of a low-cost and robust gas sensor, suitable for mass production. Although the smallest lithographic definition is higher than half a micrometer, appropriate tuning of the biasing of the gates concludes a conducting channel with a tunable diameter, which can transform the conducting channel into a nanowire with a diameter smaller than 20 nm. The tunable size and shape of the nanowire elicits tunable sensing parameters, such as sensitivity, limit of detection, and dynamic range, such that a single EFN gas sensor can perform with high sensitivity and a broad dynamic range by merely changing the biasing configuration. The current work reviews the design of the EFN gas sensor, its fabrication considerations and process flow, means of electrical characterization, and preliminary sensing performance at room temperature, underlying the unique and advantageous tunable capability of the device.

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“…The bell-shaped behavior of metal-functionalized oxides as a function of the amount of metal NPs (Figure 6c) is common and often reported in the literature [16,42,43,44,45,46]. The sensitivity of functionalized oxides is greatly influenced by the loading concentration and position of the metal NPs.…”

Section: Resultsmentioning

confidence: 60%

Improvement of Toluene-Sensing Performance of SnO2 Nanofibers by Pt Functionalization

Kim

Abideen

Yong

et al. 2016

Sensors

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Functionalization of metal nanoparticles (NPs) on oxide materials is a commonly employed technique for enhancing the sensitivity and selectivity of materials for gas sensing applications. In this study, we functionalized electrospinning-synthesized SnO2 nanofibers (NFs) with various amounts of Pt NPs to enhance the toluene-sensing properties. In particular, Pt NPs were prepared by deposition of Pt films by sputtering and subsequent heat treatment. Electronic and chemical sensitizations by the Pt NPs were responsible for the improved toluene sensitivity. The best sensing properties were achieved at an optimized amount of Pt NPs, showing a volcano shape in relation to the amount of Pt NPs. The method used in this study is useful for the development of toluene-sensitive and -selective chemiresistive NF-based gas sensors.

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Synthesis of ZnO–Ag Hybrids and Their Gas-Sensing Performance toward Ethanol

Cited by 74 publications

References 42 publications

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

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

The Electrostatically Formed Nanowire: A Novel Platform for Gas-Sensing Applications

Improvement of Toluene-Sensing Performance of SnO2 Nanofibers by Pt Functionalization

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