Investigation on formaldehyde gas sensor with ZnO thick film prepared through microwave heating method

Chu, Xiangcheng; Chen, Tongyun; Zhang, Wang-bing; Zheng, Banqiao; Shui, Hengfu

doi:10.1016/j.snb.2009.07.049

Cited by 161 publications

(56 citation statements)

References 31 publications

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“…After this reaction takes place, the electrons trapped by the adsorbed oxygen go back the conduction band of ZnO and lead to a decrease in sensor resistance. However, it was reported that the dominant oxygen species above 300°C are O 2− ones [37], much more unstable and energetic than O 2 , O 2 − or O − species that dominate the oxygen chemisorption below 300°C [38,39] and thus, they could be accounted for the increased sensitivity at higher operating temperature due to an enhanced reaction with the ethanol molecules, similarly to formaldehyde [40]. The cross-response was further tested by exposing the ZnO films to other potential gases including CO, H 2 S, CO 2 , and NH 3 .…”

Section: Resultsmentioning

confidence: 99%

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

et al. 2015

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We have investigated the gas sensing properties of ZnO thin films (100 to 200 nm thickness) deposited by roomtemperature radio frequency magnetron sputtering. The sensitivity of the films to ethanol vapor was measured in the 10 to 50 ppm concentration range at operating temperatures between 200 and 400°C. A synergetic effect of decreasing grain size and increasing operating temperature was observed towards the improvement of the sensitivity, reaching a value of 54 and a limit of detection as low as 0.61 ppm. The decrease in the grain size resulted in prolonged response time but faster recovery. In any case, both response time and recovery time are < 400 s. The results demonstrate that room-temperature magnetron sputtering is a viable approach to enhance the performances of ZnO films in sensors for ethanol vapor.

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Section: Resultsmentioning

confidence: 99%

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

et al. 2015

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“…The good selectivity can be well explained by an electron-liberate theory [49], the reducing ability of the test gas [50] (referring to the degree of difficulty of the receiving and losing electrons of the test gas in an oxidation-reduction reaction) and the bond energy of the test gas [51,52]. Since the operating temperature of the nano-SnO 2 flat-type coplanar gas sensor arrays is 400°C, O 2− is the dominating species of chemisorbed oxygen on the surface and grain boundaries [50,53].…”

Section: Characterization Of Nano-sno 2 Powdersmentioning

confidence: 90%

“…At the same concentration of the test gas, the more the liberated electrons, the higher the response [49,50]. So it seems that the order of the response should be xy-…”

Section: Characterization Of Nano-sno 2 Powdersmentioning

confidence: 99%

“…Since the operating temperature of the nano-SnO 2 flat-type coplanar gas sensor arrays is 400°C, O 2− is the dominating species of chemisorbed oxygen on the surface and grain boundaries [50,53]. The complete oxidation reactions of the test gas are as follows (take MPD (C 6 H 14 O 2 ), ammonia (NH 3 ) and formaldehyde (CH 2 O) as examples):…”

Section: Characterization Of Nano-sno 2 Powdersmentioning

confidence: 99%

“…The benzene ring in xylene and -cyclohexyl in cyclohexane are stable [35,50,54], resulting in the low responses of the gas sensor arrays to xylene and cyclohexane. Due to the fact that methyl is an electron-donating group [35,53], the response of the gas sensor arrays to xylene is a little higher than that to cyclohexane.…”

Section: Characterization Of Nano-sno 2 Powdersmentioning

confidence: 99%

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2-Methyl-2,4-pentanediol gas sensor properties of nano-SnO2 flat-type coplanar gas sensing arrays at low detection limit

Zhu

Huang²,

Yuan

et al. 2014

Materials Science-Poland

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Nano-SnO 2 flat-type coplanar 2-Methyl-2,4-pentanediol (MPD) gas sensor arrays were fabricated by a screen-printing technique based on nano-SnO 2 powders prepared by a hydrothermal method. The results show that the fabricated gas sensor arrays have good MPD gas sensing characteristics, such as good selectivity and response-recovery characteristics. Especially, they can be used for detecting the concentration of MPD gas as low as 1 ppm which is much lower than the legal concentration of 20 ppm or 25 ppm. The good sensing properties indicate that the SnO 2 gas sensor arrays have great potential for on-line or portable monitoring of MPD gas in practical environments.

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Enzymatic Electrochemical Biosensor from Eu‐Doped SnO₂ Embedded in MXene for High Performance Sensing Lactate

et al. 2022

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In this work, Eu3+‐doped SnO2 nanoparticles are prepared and embedded into MXene (Ti3C2) laminates, and Ti3C2@Eu‐SnO2 composites are obtained. Cyclic voltammetry (CV) and scanning electron microscopy (SEM) characterization show that the composites have excellent electrochemical properties and unique morphology. The electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectrometer (FTIR) results of lactate oxidase (Lox) immobilized on Ti3C2@Eu‐SnO2 indicate that Eu‐SnO2, Ti3C2, and Lox have a good hybrid coordination and biocompatibility. The enzymatic electrochemical biosensor constructed with Ti3C2@Eu‐SnO2/Lox on glassy carbon electrode (GCE) reveals an excellent linear relationship in the lactate concentration ranging from 1.0×10−9 to 1.0×10−4 mol L−1. It has a low detection limit of 3.38×10−10 mol L−1 and high sensitivity of 4.815 mA nmol−1 L cm−2. Furthermore, the fabricated biosensor has a reasonable recovery rate for determining lactate in human serum.

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Investigation on formaldehyde gas sensor with ZnO thick film prepared through microwave heating method

Cited by 161 publications

References 31 publications

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

2-Methyl-2,4-pentanediol gas sensor properties of nano-SnO2 flat-type coplanar gas sensing arrays at low detection limit

Enzymatic Electrochemical Biosensor from Eu‐Doped SnO₂ Embedded in MXene for High Performance Sensing Lactate

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Investigation on formaldehyde gas sensor with ZnO thick film prepared through microwave heating method

Cited by 161 publications

References 31 publications

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

2-Methyl-2,4-pentanediol gas sensor properties of nano-SnO2 flat-type coplanar gas sensing arrays at low detection limit

Enzymatic Electrochemical Biosensor from Eu‐Doped SnO2 Embedded in MXene for High Performance Sensing Lactate

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Resources

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Enzymatic Electrochemical Biosensor from Eu‐Doped SnO₂ Embedded in MXene for High Performance Sensing Lactate