ZnO and Au/ZnO thin films: Room-temperature chemoresistive properties for gas sensing applications

Gaiardo, Andrea; Fabbri, Barbara; Giberti, A; Guidi, V.; Bellutti, P.; Malagù, C.; Valt, Matteo; Pepponi, G.; Gherardi, S.; Zonta, Giulia; Martucci, Alessandro; Sturaro, Marco; Landini, Nicolò

doi:10.1016/j.snb.2016.07.134

Cited by 58 publications

(29 citation statements)

References 59 publications

(61 reference statements)

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“…At the metal-semiconductor interface, the Fermi level of ZnO shifts to a more positive potential with the electron transferring from ZnO nanorods to Au NPs, resulting in an upward band bending at the interface and the Schottky barrier. The light-excited electrons produced in Au NPs can overcome Schottky barrier and inject into the CB of ZnO due to the LSPR absorption upon exposure to visible light [37][38][39]. Meanwhile, oxygen vacancies introduce defect levels between the valence band and conduction band of ZnO, which is conducive to the transition of trapped electrons at oxygen vacancies to conduction band induced by the visible light illumination [33].…”

Section: Resultsmentioning

confidence: 99%

Enhancing visible light-activated NO₂ sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

Chen

Zhang

Xie³

et al. 2020

Mater. Res. Express

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Increasing light absorption is of crucial importance for optimizing light-activated gas detection. However, the relevant research is still far from sufficient. Herein, a high performance visible lightactivated NO 2 gas sensor is developed relied on the localized surface plasmon resonance (LSPR) and increased surface oxygen vacancies. Au NPs decorated ZnO nanorod array as sensitive materials was synthesized via a two-step low temperature hydrothermal process. The influences of Au decoration and light wavelength on the sensing behaviors were systematically investigated. It is found that the Au NPs decoration can largely promote the visible light-activated gas sensing properties in comparison with pure ZnO film. In addition, the as-prepared sensors demonstrate excellent repeatability and selectivity as well as moisture stability. Moreover, the sensing mechanism based on LSPR was discussed in detail. This work not only sheds some lights on the fundamental understanding for the LSPR enhanced gas sensing mechanism, but also offers an approach in constructing high-performance light-activated gas sensor.

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Section: Resultsmentioning

confidence: 99%

Enhancing visible light-activated NO₂ sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

Chen

Zhang

Xie³

et al. 2020

Mater. Res. Express

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“…The sensors vary their resistance in contact with the gas and can distinguish different mixtures. Each sensor is composed of a film of nanostructured semiconductor material [6,7].…”

Section: Methodsmentioning

confidence: 99%

Use of Gas Sensors and FOBT for the Early Detection of Colorectal Cancer

Zonta

Anania

Togni

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Among the major challenges of medicine today there are screening and early detection of tumors (since the adenoma stage) in order to prevent their degeneration into malignant cancer and/or metastases. In particular, the colorectal cancer shows a high curability rate, up to 90%, if identified when in its benign stage. The Protocol discussed here is proposed to implement the clinical validation of a device consisting of an array of chemoresistive gas sensors made of semiconductor materials, able of identifying the difference between fecal exhalation of healthy subjects and of subjects suffering from high-risk colorectal polyps or tumors. The tests are compared to the results of fecal occult blood test and colonoscopy as a gold standard.

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“…The sensor showed a selective response to NO 2 gas under green light illumination. Moreover, Au/ZnO sensor can detect SO 2 gas in ppm level in humid conditions [ 66 ].…”

Section: Zno Nanowire Sensorsmentioning

confidence: 99%

ZnO Nanowire Application in Chemoresistive Sensing: A Review

et al. 2017

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This article provides an overview of the recent development of ZnO nanowires (NWs) for chemoresistive sensing. Working mechanisms of chemoresistive sensors are unified for gas, ultraviolet (UV) and bio sensor types: single nanowire and nanowire junction sensors are described, giving the overview for a simple sensor manufacture by multiple nanowire junctions. ZnO NW surface functionalization is discussed, and how this effects the sensing is explained. Further, novel approaches for sensing, using ZnO NW functionalization with other materials such as metal nanoparticles or heterojunctions, are explained, and limiting factors and possible improvements are discussed. The review concludes with the insights and recommendations for the future improvement of the ZnO NW chemoresistive sensing.

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ZnO and Au/ZnO thin films: Room-temperature chemoresistive properties for gas sensing applications

Cited by 58 publications

References 59 publications

Enhancing visible light-activated NO₂ sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

Enhancing visible light-activated NO₂ sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

Use of Gas Sensors and FOBT for the Early Detection of Colorectal Cancer

ZnO Nanowire Application in Chemoresistive Sensing: A Review

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ZnO and Au/ZnO thin films: Room-temperature chemoresistive properties for gas sensing applications

Cited by 58 publications

References 59 publications

Enhancing visible light-activated NO2 sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

Enhancing visible light-activated NO2 sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

Use of Gas Sensors and FOBT for the Early Detection of Colorectal Cancer

ZnO Nanowire Application in Chemoresistive Sensing: A Review

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Product

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Enhancing visible light-activated NO₂ sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

Enhancing visible light-activated NO₂ sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies