Temperature &amp; light modulation to enhance the selectivity of Pt-modified zinc oxide gas sensor

Deng, Qian; Gao, Shi; Tao, Lei; Ling, Yansong; Zhang, Shunping; Xie, Changsheng

doi:10.1016/j.snb.2017.03.107

Cited by 47 publications

(15 citation statements)

References 45 publications

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“…Temperature modulation could improve the selectivity by modify the adsorption and desorption kinetics and the light modulation could generate photocarriers for the sensing process. In their work, they claimed that the combination of temperature and light modulation offered the best gas selectivity of Pt modified ZnO sensor [ 83 ]. Peng synthesized copper decorated ZnO (1 mol %) nanocrystals by sol-gel method and used it for ethanol and acetone sensing at room temperature.…”

Section: Metal Oxide Materials Composites and Metal Oxide With Dopmentioning

confidence: 99%

Light-Activated Metal Oxide Gas Sensors: A Review

Fang

2017

Micromachines

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Conductometric gas sensors facilitated by photons have been investigated for decades. Light illumination may enhance device attributes including operational temperature, sensing sensitivity and selectivity. This paper aims to provide an overview on the progress of light-activated gas sensors, with a specific focus on sensors based on metal oxides. The material systems that have been studied include pure metal oxides, heterostructures of semiconductor-metal oxides and metal-metal oxides, and metal oxides with dopant. Other reported works on the use of different nanostructures such as one-dimensional and porous nanostructures, study of sensing mechanisms and the interplay between various factors are also summarized. Possible directions for further improvement of sensing properties, through optimizing the size of nanomaterials, film thickness, light intensity and wavelength are discussed. Finally, we point out that the main challenge faced by light-activated gas sensors is their low optical response, and we have analyzed the feasibility of using localized surface plasmon resonance to solve this drawback. This article should offer readers some key and instructive insights into the current and future development of light-activated gas sensors.

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Section: Metal Oxide Materials Composites and Metal Oxide With Dopmentioning

confidence: 99%

Light-Activated Metal Oxide Gas Sensors: A Review

Fang

2017

Micromachines

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“…Despite the fact that in some cases the obtained materials demonstrated high sensor sensitivity, many authors noted the low selectivity of materials based on individual binary metal oxides. Attempts to influence the selectivity of UV-activated gas sensors are inherited from thermally activated sensors, and are currently being developed in the direction of chemical modification (sensitization) of the oxide matrix by catalytically active nanoparticles of noble metals, such as Au [ 65 , 66 , 67 , 68 , 69 ], Ag [ 70 , 71 ], Pt [ 72 , 73 ], Pd [ 74 ], PdO clusters [ 75 ], nanoparticles of transition metals [ 76 ], and carbon materials [ 77 , 78 , 79 ]. For example, it is stated in [ 72 ] that modification of SnO 2 by platinum clusters of 8–10 nm in size leads to a significant (40–70 times) enhancement of the sensor response when detecting hydrocarbon vapors at room temperature and illuminated by a UV radiation source (λ max = 365 nm, 2 μW/cm 2 ).…”

Section: Activation Of Gas Sensitivity Of Semiconductor Metal Oxides Under Uv 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 performance indicators of the platform were as follows. The measurement range of resistance was 100 Ω–1 GΩ with an error less than 5% [ 24 , 25 , 26 , 27 ]. The resistance acquisition rate of each channel was more than 2 Hz.…”

Section: Combinatorial and High-throughput Technique For Screeningmentioning

confidence: 99%

“…Furthermore, FDA was used as pattern recognition method. FDA has been widely used as a method of pattern recognition [ 24 , 25 , 28 ] and mainly constructs high-dimensional historical data into a low-dimensional principal component space. When discriminating, the data acquired in real time are projected onto the principal component space and transformed into new data for pattern recognition.…”

Section: Details Of Handheld Wireless E-nose Systemmentioning

confidence: 99%

A Set of Platforms with Combinatorial and High-Throughput Technique for Gas Sensing, from Material to Device and to System

et al. 2018

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In a new E-nose development, the sensor array needs to be optimized to have enough sensitivity and selectivity for gas/odor classification in the application. The development process includes the preparation of gas sensitive materials, gas sensor fabrication, array optimization, sensor array package and E-nose system integration, which would take a long time to complete. A set of platforms including a gas sensing film parallel synthesis platform, high-throughput gas sensing unmanned testing platform and a handheld wireless E-nose system were presented in this paper to improve the efficiency of a new E-nose development. Inkjet printing was used to parallel synthesize sensor libraries (400 sensors can be prepared each time). For gas sensor selection and array optimization, a high-throughput unmanned testing platform was designed and fabricated for gas sensing measurements of more than 1000 materials synchronously. The structures of a handheld wireless E-nose system with low power were presented in detail. Using the proposed hardware platforms, a new E-nose development might only take one week.

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Temperature & light modulation to enhance the selectivity of Pt-modified zinc oxide gas sensor

Cited by 47 publications

References 45 publications

Light-Activated Metal Oxide Gas Sensors: A Review

Light-Activated Metal Oxide Gas Sensors: A Review

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

A Set of Platforms with Combinatorial and High-Throughput Technique for Gas Sensing, from Material to Device and to System

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