Optimization of copper oxide film by dip coating technique for oxygen detection

Copper oxide (CuO) based gas sensor has been widely investigated due to its low- cost material, nontoxicity and abundant on earth. The CuO hierarchical structure is used to enhance the sensing performance of the gas sensor. This is because of its structure provides large surface area for the adsorpt...

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Main Author:	Raship, Nur Amaliyana
Format:	Thesis
Language:	English English English
Published:	2018
Subjects:	QC170-197 Atomic physics Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Online Access:	http://eprints.uthm.edu.my/437/1/24p%20NUR%20AMALIYANA%20RASHIP.pdf http://eprints.uthm.edu.my/437/2/NUR%20AMALIYANA%20RASHIP%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/437/3/NUR%20AMALIYANA%20RASHIP%20WATERMARK.pdf
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spelling	my-uthm-ep.4372021-07-25T06:23:37Z Optimization of copper oxide film by dip coating technique for oxygen detection 2018-03 Raship, Nur Amaliyana QC170-197 Atomic physics. Constitution and properties of matter. Including molecular physics, relativity, quantum theory, and solid state physics Copper oxide (CuO) based gas sensor has been widely investigated due to its low- cost material, nontoxicity and abundant on earth. The CuO hierarchical structure is used to enhance the sensing performance of the gas sensor. This is because of its structure provides large surface area for the adsorption of gas into the sensing surface. However, most of the structure of CuO based gas sensors fabricated using various deposition techniques are particle structure. In this research, dip coating technique is proposed for the preparation of CuO hierarchical structure by optimized the annealing temperature, various pH of solutions and withdrawal speed of dip coating. The phase structure, morphology and surface roughness of CuO films were characterized by using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and atomic force microscope (AFM), respectively. In addition, the thickness and electrical properties of CuO films were measured using surface profiler and four-point probe, respectively. Based on the results, 400 oC annealing temperature, pH 12.0 of CuO solution and 70 mm/min of withdrawal speed are the optimum parameters of CuO films for gas detection. The XRD results showed that these films have high crystal quality which crystallize along the (002) and (111) phase with preferential orientation along the c-axis of the CuO monoclinic structure. These films exhibit a uniform and homogeneous flower-like structure. The surface roughness of these films were 70.18 nm and the films thickness were found to be 0.76 μm. The electrical properties of these films show that they are conductive due to their lower resistivity which are 1.18 Ω.cm. Finally, these films were deposited at different withdrawal speed and their gas sensing ability towards oxygen gas were tested. As a result, CuO film at 70 mm/min of withdrawal speed exhibit sensitivity, response time and recovery time of 26.7 %, 2.381 s and 7.128 s, respectively. This research concludes that the CuO flower-like structure deposited by dip coating technique exhibit a good performance and works well as oxygen gas detection at room temperature. 2018-03 Thesis http://eprints.uthm.edu.my/437/ http://eprints.uthm.edu.my/437/1/24p%20NUR%20AMALIYANA%20RASHIP.pdf text en public http://eprints.uthm.edu.my/437/2/NUR%20AMALIYANA%20RASHIP%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/437/3/NUR%20AMALIYANA%20RASHIP%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Faculty of Electrical and Electronic Engineering
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	QC170-197 Atomic physics Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
spellingShingle	QC170-197 Atomic physics Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics Raship, Nur Amaliyana Optimization of copper oxide film by dip coating technique for oxygen detection
description	Copper oxide (CuO) based gas sensor has been widely investigated due to its low- cost material, nontoxicity and abundant on earth. The CuO hierarchical structure is used to enhance the sensing performance of the gas sensor. This is because of its structure provides large surface area for the adsorption of gas into the sensing surface. However, most of the structure of CuO based gas sensors fabricated using various deposition techniques are particle structure. In this research, dip coating technique is proposed for the preparation of CuO hierarchical structure by optimized the annealing temperature, various pH of solutions and withdrawal speed of dip coating. The phase structure, morphology and surface roughness of CuO films were characterized by using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and atomic force microscope (AFM), respectively. In addition, the thickness and electrical properties of CuO films were measured using surface profiler and four-point probe, respectively. Based on the results, 400 oC annealing temperature, pH 12.0 of CuO solution and 70 mm/min of withdrawal speed are the optimum parameters of CuO films for gas detection. The XRD results showed that these films have high crystal quality which crystallize along the (002) and (111) phase with preferential orientation along the c-axis of the CuO monoclinic structure. These films exhibit a uniform and homogeneous flower-like structure. The surface roughness of these films were 70.18 nm and the films thickness were found to be 0.76 μm. The electrical properties of these films show that they are conductive due to their lower resistivity which are 1.18 Ω.cm. Finally, these films were deposited at different withdrawal speed and their gas sensing ability towards oxygen gas were tested. As a result, CuO film at 70 mm/min of withdrawal speed exhibit sensitivity, response time and recovery time of 26.7 %, 2.381 s and 7.128 s, respectively. This research concludes that the CuO flower-like structure deposited by dip coating technique exhibit a good performance and works well as oxygen gas detection at room temperature.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Raship, Nur Amaliyana
author_facet	Raship, Nur Amaliyana
author_sort	Raship, Nur Amaliyana
title	Optimization of copper oxide film by dip coating technique for oxygen detection
title_short	Optimization of copper oxide film by dip coating technique for oxygen detection
title_full	Optimization of copper oxide film by dip coating technique for oxygen detection
title_fullStr	Optimization of copper oxide film by dip coating technique for oxygen detection
title_full_unstemmed	Optimization of copper oxide film by dip coating technique for oxygen detection
title_sort	optimization of copper oxide film by dip coating technique for oxygen detection
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Faculty of Electrical and Electronic Engineering
publishDate	2018
url	http://eprints.uthm.edu.my/437/1/24p%20NUR%20AMALIYANA%20RASHIP.pdf http://eprints.uthm.edu.my/437/2/NUR%20AMALIYANA%20RASHIP%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/437/3/NUR%20AMALIYANA%20RASHIP%20WATERMARK.pdf
_version_	1747830609885003776

Optimization of copper oxide film by dip coating technique for oxygen detection

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