Synthesis of ZnO nanorods by spray pyrolysis for H2S gas sensor

-Thick film technique is popular because of low cost, simple for construction and better sensing surface area, hence for resistive gas sensor thick films of pure ZrO 2 powder were prepared by Standard screen printing technique. The material was characterized by X-Ray diffraction pattern, surface morphology was observed by SEM, elemental composition were observed by EDAX and optical properties were studied with UV spectroscopy Techniques, electrical properties were studying with different applied voltages and at different working temperature. X-Ray Diffraction studies confirmed that the combinations of tetragonal and monoclinic structure. The energy band gap and the thicknesses of the films were evaluated, the crystalline grain size was

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“…The typical plots of the (αhν) 2 verses hν for undoped (pure) zirconia substrate. It is observed that band gap is 4.2 eV [32][33][34][35][36]. …”

Section: Optical Propertiesmentioning

confidence: 99%

Preparation and Characterization of Zirconia Based Thick Film Resistor as a Ammonia Gas Sensor

Deshmukh

Bari

Patil³

et al. 2012

International Journal on Smart Sensing and Intelligent Systems

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“…However, recently reported experiments are limited to the fabrication of and investigation on the gas-sensing properties of ZnO NRs/NWs and have not investigated the design and fabrication of compacted devices [7]: Shinde reported on the synthesis of ZnO NRs via spray pyrolysis for H 2 S gas sensor [8]; Hu et al reported on the highly formaldehyde-sensitive, transition-metal doped ZnO NRs prepared via plasma-enhanced chemical vapor deposition [9]; and Rai et al reported on the microwave-assisted hydrothermal synthesis of ZnO NRs for gas sensor application [10].…”

Section: Introductionmentioning

confidence: 99%

Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors

Nguyen

Quy

Hòa

et al. 2014

Sensors and Actuators B: Chemical

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Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors. Chemical, http://dx.doi. org/10.1016/j.snb.2013.11.043 Access to the published version may require subscription. N.B. When citing this work, cite the original published paper. Sensors and actuators. B, Abstract:The proper engineering design of gas sensors and the controlled synthesis of sensing materials for the high-performance detection of toxic gas are very important in the fabrication of handheld devices. In this study, an effective design for gas sensor chips is developed to control the formation of grown ZnO nanowires (NWs). The design utilizes the dendrite islands of Au catalyst deposited on and between Pt electrodes of a planar-type micro gas sensor so that NWs can grow on instead of a continuous Au seed layer. This method results in an increase of NW-NW junctions on the device and also eliminates current leakage through the seed layer, which results in a higher sensitivity. The results show that the developed gas-sensing devices could be used to monitor NO 2 at moderate temperature (~250 °C) and/or ethanol at a high temperature (~400 °C).

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“…ZnO is known to be an n-type semiconductor with a wide band gap 3.35 eV at room temperature and a large exciton binding energy of about 60 meV [7]. Numerous techniques such as reactive evaporation, sputtering, pulsed laser deposition, sol-gel and spray pyrolysis were used for the growth of undoped and doped ZnO thin films [8][9][10][11][12][13][14][15][16]. It is well established that physical and chemical properties of ZnO can be largely modified upon doping [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the structural, optical and electrical properties of Nd-doped ZnO thin films deposited by spray pyrolysis

Douayar¹,

Prieto²,

Schmerber³

et al. 2013

Eur. Phys. J. Appl. Phys.

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Abstract. Neodymium-doped zinc oxide (NZO) thin films were deposited on glass substrates by spray pyrolysis technique. X-ray diffraction patterns have shown that both undoped and Nd-doped ZnO films exhibit the hexagonal wurtzite crystal structure with a preferential orientation along [0 0 2] direction. The effective doping concentration has been determined by Rutherford backscattering measurements showing that the neodymium is not incorporated easily into ZnO host matrix. The surface roughness was shown to increase with Nd doping. NZO films are highly transparent in the visible region. The lowest electrical resistivity value of about 4.0 10 −2 Ω cm was obtained for 1% Nd effective doping.

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Synthesis of ZnO nanorods by spray pyrolysis for H2S gas sensor

Cited by 147 publications

References 43 publications

Preparation and Characterization of Zirconia Based Thick Film Resistor as a Ammonia Gas Sensor

Preparation and Characterization of Zirconia Based Thick Film Resistor as a Ammonia Gas Sensor

Controllable growth of ZnO nanowires grown on discrete islands of Au catalyst for realization of planar-type micro gas sensors

Investigation of the structural, optical and electrical properties of Nd-doped ZnO thin films deposited by spray pyrolysis

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