Structural analysis of aerosol spray pyrolysis ZnO films exhibiting ultra low ozone detection limits at room temperature

Kortidis, Ioannis; Moschovis, K.; Mahmoud, Fawzy A.; Kiriakidis, G.

doi:10.1016/j.tsf.2009.08.018

Cited by 27 publications

(10 citation statements)

References 29 publications

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“…Room temperature operation is an issue for intrinsic safety of sensors working in harsh or industrial environment, moreover it is interesting to the power consumption and consequently the size of its associated electronics [1][2][3]. Nowadays, solid-state devices have evolved rapidly by improving the quality and decreasing the processing and operating costs [4].…”

Section: Introductionmentioning

confidence: 99%

Chemoresistive properties of photo-activated thin and thick ZnO films

Fabbri

Gaiardo

Giberti

et al. 2016

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

Chemoresistive properties of photo-activated thin and thick ZnO films

Fabbri

Gaiardo

Giberti

et al. 2016

Sensors and Actuators B: Chemical

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“…ZnO nanomaterials can be simply synthesized at monitored chemical condition and small temperatures. Besides, some exceptional properties make ZnO as a suitable sensing material for gas sensing applications including novel structural arrangements, high single crystallinity surfaces and increased surface area to volume ratio [23][24][25]. Sensing gas molecules, specifically toxic air pollutants, is critical in environmental pollution reduction and agricultural and medical remediation [26].…”

Section: Introductionmentioning

confidence: 99%

Molecular design of O3 and NO2 sensor devices based on a novel heterostructured N-doped TiO2/ZnO nanocomposite: a van der Waals corrected DFT study

Abbasi

Sardroodi

2017

J Nanostruct Chem

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We have presented a density functional theory study of the adsorption properties of NO 2 and O 3 molecules on heterostructured TiO 2 /ZnO nanocomposites. The most stable adsorption configurations, adsorption energies and charge transfers were calculated. The electronic properties of the complex TiO 2 /ZnO heterostructures were described using the density of states and molecular orbital analyses. For NO 2 adsorption, it was found that the oxygen atoms preferentially move towards the fivefold coordinated titanium atoms, whereas the nitrogen atom binds to the zinc atom. In the case of O 3 adsorption, the side oxygen atoms bind to the fivefold coordinated titanium sites, and the central oxygen atom does not contribute to the adsorption any longer. Thus, the interaction of NO 2 and O 3 molecules with TiO 2 side of nanocomposite is strongly favored. On the N-doped TiO 2 /ZnO nanocomposites, the adsorption process is more energetically favorable than that on the pristine ones. The N-doped nanocomposites are far more sensitive to gas detection than the undoped ones. In TiO 2 / ZnO nanocomposites, the interactions of gas molecule and TiO 2 are stronger than those between gas molecule and bare TiO 2 nanoparticles, which reveals that ZnO is conducive to the interaction of NO 2 and O 3 molecules with TiO 2 nanoparticles. Our theoretical results suggest multicomponent TiO 2 /ZnO nanocomposite as a potential material for gas sensing application. Graphical AbstractKeywords Interaction Á Density functional theory Á PDOS Á NO 2 Á O 3 Á TiO 2 /ZnO nanocomposite

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“…ZnO is an important multifunctional material with an intrinsic n-type semiconducting character; recently, it has become the subject of intensive scientific research owing to its unique properties, which enable its effective application in various devices, including light-emitting diodes, nanolasers, piezoelectric devices, antibacterial agents, solar cells, and gas sensors [1][2][3][4][5]. ZnO-based gas sensors have attracted attention because of their high chemical stability, non-toxicity, low cost and fabrication simplicity, as well as the high potential in detecting volatile gases [6][7]. O 3 , which is a gas with a high oxidation potential, is an energy rich and highly unstable form of oxygen, and has been extensively applied in several areas, from medicine to drinking water treatment [8][9], assisting in the destabilization and aggregation of particles by several mechanisms, as previously reported [10].…”

Section: Introductionmentioning

confidence: 99%

Novel ozone gas sensor based on ZnO nanostructures grown by the microwave-assisted hydrothermal route

Rocha

Foschini

Silva

et al. 2016

Ceramics International

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Good quality ZnO nanostructures were obtained by the microwave-assisted hydrothermal synthesis, at low reaction temperatures, using zinc acetate as the starting precursor. X-ray diffraction confirmed the crystallinity of the ZnO nanostructures, which resulted free of impurities. Field emission gun scanning electron microscopy analysis revealed that the ZnO nanostructures crystallized at 120 1C were more homogeneous and had a constant diameter along the entire wire length, exhibiting an ideal defect density that favors the gas sensing response. A new ozone gas sensor based on these nanostructures was evaluated at low exposure times (15 s) by recording the change in the film resistance. The ZnO nanostructures showed good sensitivity even at low ozone concentration (100 ppb), and fast response and short recovery time at 200 1C, demonstrating great potential for a variety of applications. Two main effects were observed: the first one is intrinsic to that of the sample, while the second is a consequence of the surface and interface complex cluster defects, which produce extrinsic defects.

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Structural analysis of aerosol spray pyrolysis ZnO films exhibiting ultra low ozone detection limits at room temperature

Cited by 27 publications

References 29 publications

Chemoresistive properties of photo-activated thin and thick ZnO films

Chemoresistive properties of photo-activated thin and thick ZnO films

Molecular design of O3 and NO2 sensor devices based on a novel heterostructured N-doped TiO2/ZnO nanocomposite: a van der Waals corrected DFT study

Novel ozone gas sensor based on ZnO nanostructures grown by the microwave-assisted hydrothermal route

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