Highly sensitive, fast and reversible NO2 sensors at room-temperature utilizing nonplasmonic electrons of ZnO/Pd hybrids

Wang, Jing; Hu, Chen-Yu; Xia, Yi; Komarneni, Sridhar

doi:10.1016/j.ceramint.2019.12.081

Cited by 27 publications

(16 citation statements)

References 37 publications

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“…Wang et al also prepared ZnO/Pd hybrid materials to achieve a high response of ppb level NO 2 under visible light at room temperature. 139 In the end, we provide a table referring to the abbreviations in the text and their corresponding full names (Table 7).…”

Section: Light Activationmentioning

confidence: 99%

Low-temperature operating ZnO-based NO₂ sensors: a review

et al. 2020

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Section: Light Activationmentioning

confidence: 99%

Low-temperature operating ZnO-based NO₂ sensors: a review

et al. 2020

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“…Organic dye molecules, narrow-gap semiconductor particles, or colloidal quantum dots of semiconductors or metal nanoparticles [ 132 ] can act as sensitizers. It is now established that the sensitization effect is caused by the injection of photoexcited charge carriers from the sensitizer particles into the metal oxide matrix.…”

Section: Activation Of Gas Sensitivity Of Semiconductor Metal Oxides Under Visible Lightmentioning

confidence: 99%

Light Activation of Nanocrystalline Metal Oxides for Gas Sensing: Principles, Achievements, Challenges

2021

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The review deals with issues related to the principle of operation of resistive semiconductor gas sensors and the use of light activation instead of thermal heating when detecting gases. Information on the photoelectric and optical properties of nanocrystalline oxides SnO2, ZnO, In2O3, and WO3, which are the most widely used sensitive materials for semiconductor gas sensors, is presented. The activation of the gas sensitivity of semiconductor materials by both UV and visible light is considered. When activated by UV light, the typical approaches for creating materials are (i) the use of individual metal oxides, (ii) chemical modification with nanoparticles of noble metals and their oxides, (iii) and the creation of nanocomposite materials based on metal oxides. In the case of visible light activation, the approaches used to enhance the photo- and gas sensitivity of wide-gap metal oxides are (i) doping; (ii) spectral sensitization using dyes, narrow-gap semiconductor particles, and quantum dots; and (iii) addition of plasmon nanoparticles. Next, approaches to the description of the mechanism of the sensor response of semiconductor sensors under the action of light are considered.

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“…The field of photoactivated gas sensors usually refers to metal-semiconductor junction-based materials containing noble metals such as gold (Au), silver (Ag), platinum (Pt), and palladium (Pd) and semiconductors such as MOX or TMDCs [17]. The systems tested for low NO 2 concentration focus on ZnO and its modification with metals such as Ag [61] and Pd [62], as well as WS 2 modified with Au [39] (Table 2). Overall, these systems showed a response to NO 2 under visible light activation.…”

Section: Modified Photoactive Materials With Metal-semiconductor Nanojunctionsmentioning

confidence: 99%

“…The modification of ZnO with Pd nanoparticles also influenced the behavior of ZnO, making it optically active in the visible light region and responsive to NO 2 due to the injection of photoexcited non-plasmonic electrons from Pd nanoparticles to ZnO [62]. The photocatalytic properties of Pd nanostructures under visible light were also investigated previously in the area of photoactivation [76,88].…”

Section: Modified Photoactive Materials With Metal-semiconductor Nanojunctionsmentioning

confidence: 99%