Investigation On The Properties Of Nanostructured Nickel Oxide Layer For Hydrogen Gas Sensor

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dc.contributor.authorAbubakar, Dauda
dc.date.accessioned2019-04-30T06:46:19Z
dc.date.available2019-04-30T06:46:19Z
dc.date.issued2018-03
dc.description.abstractIn this work, nanostructured NiO layers were synthesized using chemical bath deposition (CBD) and thermal oxidation methods for high performance of H2 gas sensor. The synthesis of nanostructured NiO layer was controlled base on several growth parameters which were varied in each deposition methods. The structural, morphological, and optical properties of nanostructured NiO layer were studied using XRD, FESEM, EDX and UV-Vis spectrometer. The crystal size, surface roughness, porous surface, layer thickness, and crystallinity are factors that have great influence in enhancing the H2 gas sensing performance. These factors are the main reason why most report on NiO for H2 gas sensor shows poor sensing performance. Thus, the focus of this report is to enhance the H2 gas sensing performance base on these factors. The nanostructured NiO layer samples that were grown at 300 0C (CBD) and 550 0C (thermal oxidation) on ITO/glass substrates show good results needed for improving H2 gas sensing performance and used as the sensing membranes for H2 gas sensor. The H2 gas sensing properties of nanostructured NiO layer were studied based on the H2 gas concentration and operating temperature. It was observed that the H2 gas response (sensitivity) decreases with increase in operating temperature due to high humidity (i.e. 80 %) at low temperatures (i.e. 25 0C) that increases the resistance. The effect of humidity decreases with temperature resulting in decreasing the resistance. The CBD base sample shows higher H2 gas response (i.e. 50.44) at RT (25 0C) than thermal oxidation base sample (i.e. 3.12) due to its smaller crystal size (i.e. 19.84 nm), higher roughness (i.e. 75.2 nm), higher pore size (i.e. 300 nm) and higher layer thickness (i.e. 683.7 nm). Likewise, the power consumption at RT (25 0) of the CBD sample is lower (i.e. 0.13 mW) than thermal oxidation sample (i.e. 2.7 mW) due to the response of the CBD sample at higher resistance (i.e. 1975 ).en_US
dc.identifier.urihttp://hdl.handle.net/123456789/8120
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectProperties of nanostructured nickel oxide layeren_US
dc.subjectfor hydrogen gas sensoren_US
dc.titleInvestigation On The Properties Of Nanostructured Nickel Oxide Layer For Hydrogen Gas Sensoren_US
dc.typeThesisen_US
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