Adsorption/desorption kinetics of nitric oxide on zinc oxide nano film sensor enhanced by light irradiation and gold-nanoparticles decoration

Chinh, Nguyen Duc; Hien, Truong Thi; Lam, Do Van; Hiếu, Nguyễn Minh; Quang, Nguyen Duc; Lee, Seung‐Mo; Kim, Chunjoong; Kim, Dojin

doi:10.1016/j.snb.2018.10.113

Cited by 47 publications

(26 citation statements)

References 45 publications

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“…3.2 eV should be active under the light illumination with a wavelength shorter than 388 nm, i.e., UV light. As reported by Kim et al [ 36 ], the UV light (λ ≤ 382 nm) was found to result in the most significant decrease in the resistance of ZnO films due to generation of photoexcited electrons compared to the blue (λ ≤ 439 nm) and green (λ ≤ 525 nm) lights. However, this does not guarantee the best sensor response to NO, which was otherwise obtained under irradiation of blue light.…”

Section: Considerations Of Selection Of Light Sourcementioning

confidence: 64%

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

et al. 2020

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Room-temperature gas sensors have aroused great attention in current gas sensor technology because of deemed demand of cheap, low power consumption and portable sensors for rapidly growing Internet of things applications. As an important approach, light illumination has been exploited for room-temperature operation with improving gas sensor’s attributes including sensitivity, speed and selectivity. This review provides an overview of the utilization of photoactivated nanomaterials in gas sensing field. First, recent advances in gas sensing of some exciting different nanostructures and hybrids of metal oxide semiconductors under light illumination are highlighted. Later, excellent gas sensing performance of emerging two-dimensional materials-based sensors under light illumination is discussed in details with proposed gas sensing mechanism. Originated impressive features from the interaction of photons with sensing materials are elucidated in the context of modulating sensing characteristics. Finally, the review concludes with key and constructive insights into current and future perspectives in the light-activated nanomaterials for optoelectronic gas sensor applications.

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Section: Considerations Of Selection Of Light Sourcementioning

confidence: 64%

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

et al. 2020

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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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“…The resistance is inversely proportional to the thickness, Ro=At−1 (A is arbitrary). If a reducing gas adsorbs by the hole supply from the p-type film (such as the NH 3 adsorption on SWCNT), the surface region becomes depleted of holes with the depletion depth (d) from the each side, leading to the change of the film resistance, Rg=normalAfalse(normalt−2normaldfalse)−1 [36]. Therefore, the response of the thin film sensor is given by Equation (2), normalS=tnormalt−2normald.…”

Section: Resultsmentioning

confidence: 99%

“…The gases were further diluted in dry air by varying the gas concentration at a constant dry air flow rate of 100 sccm when fed into the test chamber. The gas concentrations were determined by normalC(ppm)=Cstd(ppm)×normalf/(normalf+normalF), [36,37] where f and F are the flow rates of the analyte gas and the carrier gas, respectively, and C std (ppm) is the concentration of the analyte gas in the gas cylinder. C std (ppm) was 1000 ppm balanced with nitrogen for all of the gases.…”

Section: Methodsmentioning

confidence: 99%

A Separated Receptor/Transducer Scheme as Strategy to Enhance the Gas Sensing Performance Using Hematite–Carbon Nanotube Composite

Hiếu

Van

Hien

et al. 2019

Sensors

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Nanocomposite structures, where the Fe, Fe2O3, or Ni2O3 nanoparticles with thin carbon layers are distributed among a single-wall carbon nanotube (SWCNT) network, are architectured using the co-arc discharge method. A synergistic effect between the nanoparticles and SWCNT is achieved with the composite structures, leading to the enhanced sensing response in ammonia detection. Thorough studies about the correlation between the electric properties and sensing performance confirm the independent operation of the receptor and transducer in the sensor structure by nanoparticles and SWCNT, respectively. Nanoparticles with a large specific surface area provide adsorption sites for the NH3 gas molecules, whereas hole carriers are supplied by the SWCNT to complete the chemisorption process. A new chemo-resistive sensor concept and its operating mechanism is proposed in our work. Furthermore, the separated receptor and transducer sensor scheme allows us more freedom in the design of sensor materials and structures, thereby enabling the design of high-performance gas sensors.

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Adsorption/desorption kinetics of nitric oxide on zinc oxide nano film sensor enhanced by light irradiation and gold-nanoparticles decoration

Cited by 47 publications

References 45 publications

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

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

A Separated Receptor/Transducer Scheme as Strategy to Enhance the Gas Sensing Performance Using Hematite–Carbon Nanotube Composite

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Adsorption/desorption kinetics of nitric oxide on zinc oxide nano film sensor enhanced by light irradiation and gold-nanoparticles decoration

Cited by 47 publications

References 45 publications

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

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

A Separated Receptor/Transducer Scheme as Strategy to Enhance the Gas Sensing Performance Using Hematite–Carbon Nanotube Composite

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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