Sensing characteristics of double layer film of ZnO

Xu, Jingyi; Shun, Yu'an; Qin, Pan; Qin, Jian-Hua

doi:10.1016/s0925-4005(00)00327-0

Cited by 71 publications

(30 citation statements)

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“…The absolute numbers for the sensitivities are significantly higher than recently developed ZnO sensors. [23,24,[35][36][37][38][39][40] Even in comparison to recent SnO 2 sensors (sensitivity S ≈ 1000 at an ethanol partial pressure p EtOH = 500 ppm; for a definition of the sensitivity see the Experimental section) [41] the ZnO sensors exhibit extraordinary performances (S ≈ 8000 at p EtOH = 500 ppm). Furthermore, the materials seem to have overcome the long-term instability problem that has been reported for many ZnO sensors.…”

Section: Sensor Preparationmentioning

confidence: 99%

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

Polarz

Roy

Lehmann

et al. 2007

Adv Funct Materials

107

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Chemical sensing on oxide sensors is a complex phenomenon involving catalytic activity as well as electronic properties. Thus, the properties of oxide sensors are highly sensitive towards structural changes. Effects like surface area, grain size, and, in addition, the occurrence of defects give separate contributions to the current. Structure–property–function relationships can be elucidated using a combination of state‐of‐the‐art analytical techniques. It is shown, that impurity atoms in the oxide lattice influence the performance of ZnO sensors more strongly than the other factors.

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Section: Sensor Preparationmentioning

confidence: 99%

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

Polarz

Roy

Lehmann

et al. 2007

Adv Funct Materials

107

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“…7 The recent improvement of doped and undoped ZnO films prepared by various methods with the required gas sensitivity and selectivity of hydrocarbons, ammonia, oxygen, and NO x has contributed to the extensive study of this material as a gas sensor. [8][9][10] The authors of this work would like to emphasize the recent trend to develop gas sensors using thin film technology, since the gas sensing principle is associated to a surface phenomenon rather than to a bulk phenomenon. 11,12 To date, the use of oxide metal films as ozone sensors required an active heating element and subsequent operations at high temperatures (above 573 K), demanding a highenergy consumption for this type of sensor elements.…”

Section: Introductionmentioning

confidence: 99%

Zinc oxide as an ozone sensor

Martins

Fortunato

Nunes

et al. 2004

Journal of Applied Physics

185

105

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This work presents a study of intrinsic zinc oxide thin film as ozone sensor based on the ultraviolet ͑UV͒ photoreduction and subsequent ozone re oxidation of zinc oxide as a fully reversible process performed at room temperature. The films analyzed were produced by spray pyrolysis, dc and rf magnetron sputtering. The dc resistivity of the films produced by rf magnetron sputtering and constituted by nanocrystallites changes more than eight orders of magnitude when exposed to an UV dose of 4 mW/ cm 2 . On the other hand, porous and textured zinc oxide films produced by spray pyrolysis at low substrate temperature exhibit an excellent ac impedance response where the reactance changes by more than seven orders of magnitude when exposed to the same UV dose, with a response frequency above 15 kHz, thus showing improved ozone ac sensing discrimination.

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“…ZnO in the form of thin films has better sensitivities than the single crystal counterparts [6]. In addition, ZnO thin films can be prepared in small dimensions at relatively low cost, which can be applied in microelectronics, circuits and sensors [7,8]. In order to enhance gas sensitivities of ZnO thin films, metal ions were frequently doped onto ZnO thin films.…”

Section: Introductionmentioning

confidence: 99%

Detection of ethanol vapours with Al-incorporated ZnO thin films

Hsu¹,

Tsai²,

Wang³

et al. 2011

Journal of Experimental Nanoscience

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Al 2 O 3 has been incorporated in the nanosize ZnO (Al/ZnO) thin film to enhance its sensitivity ðR air =R C2H5OH Þ to C 2 H 5 OH vapour. It is found that the Al/ZnO thin film has a high sensitivity (420), which is much greater than the plain ZnO by at least 50%. The speciation of zinc in the Al/ZnO thin films during detection of C 2 H 5 OH (200 ppm) has also been studied by in situ X-ray absorption near edge structure (XANES) spectroscopy. The least-square fitted XANES spectra indicate that the main zinc species in the thin film are bulky ZnO (4100 nm) (5%) and nanosize ZnO (95%). At the temperature of 300 K, during sensing of C 2 H 5 OH, a small amount of Zn(OH) 2 (7%) is formed in the thin film. The chemical interaction between C 2 H 5 OH and ZnO has also been found by in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. The bond distance of Zn-O is decreased to 1.93 Å during sensing of C 2 H 5 OH, which may be caused by the electron donating to ZnO during adsorption of C 2 H 5 OH (C 2 H 5 HO ! Zn-O). In the absence of C 2 H 5 OH, the Zn-O bond distance is restored to 1.92 Å .

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Sensing characteristics of double layer film of ZnO

Cited by 71 publications

References 0 publications

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

Zinc oxide as an ozone sensor

Detection of ethanol vapours with Al-incorporated ZnO thin films

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