Synthesis And Application Of Zno Nanorods For Oxygen Gas Sensor

dc.contributor.author	KHAIRUL ANUAR, ABD WAHID
dc.date.accessioned	2016-04-20T07:48:43Z
dc.date.available	2016-04-20T07:48:43Z
dc.date.issued	2015-02
dc.description.abstract	In this thesis, a high sensitivity and accurate gas sensor with operating temperature at room temperature has been successfully developed by using ZnO nanorods. A series of parametric studies via hydrothermal and PECVD have been carried out in order to synthesis a high dense and high aspect ratio of ZnO nanorods. It has been demonstrated that a high-density of ZnO nanorods with aspect ratio 15:1 can be successfully synthesized at an annealing temperature of 100oC and 3 hours growth duration for via hydrothermal. Meanwhile for PECVD, a high aspect ratio of 12:1 ZnO nanorods successfully synthesized at 4nm gold (Au) catalyst with chamber pressure of 700mTorr. SEM and AFM analyses showed that the formation of ZnO nanorods via hydrothermal is significantly influenced by the seeds particle morphology while for PECVD, the Au nanoparticle size and the proper ratio of vapors components are the major parameter affecting the ZnO nanorods growth. The grown ZnO from both samples is of the wurtzite crystal type based on raman shift E2(high) of 436cm-1.An electrical characteristics via four point probles been conducted and the results showed that the resistivity of the ZnO grown via hydrothermal and PECVD are 4.47×10−3Ω.𝑐𝑚 and 47×10−3Ω.𝑐𝑚 respectively. The sensitivity to oxygen gas for both ZnO nanorods has been compared in ambient environment and the results indicated that the ZnO grown through the hydrothermal methods is more sensitive of the two in which a change of resistance of 57.67%. It has also been elucidated that the gas sensor sensitivity is also increased with decreasing ZnO nanorods dimension. The response time, selectivity, resolution, stability, temperature effect and humidity effect of the gas sensor have also been characterized. The sensor drift due to fluctuation of temperature, humidity and ageing time in real environment has successfully been compensated via baseline manipulation method and the results show the 99.5% accuracy compared to commercial sensor.	en_US
dc.identifier.uri	http://hdl.handle.net/123456789/1933
dc.subject	Synthesis And Application Of Zno Nanorods	en_US
dc.subject	For Oxygen Gas Sensor	en_US
dc.title	Synthesis And Application Of Zno Nanorods For Oxygen Gas Sensor	en_US
dc.type	Thesis	en_US