Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)

This study aimed to enhance the field electron emission (FEE) properties of carbon nanotubes (CNTs) synthesized from waste cooking palm oil combined with zinc oxide (ZnO) to produce CNTs/ZnO nanocomposites. The methods used in this study were single and multi-step depositions. The single-step deposi...

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Main Author:	Rika Noor Safitri
Format:	thesis
Language:	eng
Published:	2015
Subjects:	QC Physics
Online Access:	https://ir.upsi.edu.my/detailsg.php?det=1651
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spelling	oai:ir.upsi.edu.my:16512020-02-27 Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR) 2015 Rika Noor Safitri QC Physics This study aimed to enhance the field electron emission (FEE) properties of carbon nanotubes (CNTs) synthesized from waste cooking palm oil combined with zinc oxide (ZnO) to produce CNTs/ZnO nanocomposites. The methods used in this study were single and multi-step depositions. The single-step deposition method was done by directly mixing the CNTs and ZnO precursors and they were synthesized using thermal chemical vapor deposition (TCVD) method for 30 minutes. Meanwhile, the multi-step deposition process was carried out by combining TCVD and sol-gel immersion methods to fabricate CNTs/ZnO nanocomposites. There were three different ZnO nanostructures namely nanorods, nanoflowers and nanorods-nanoflakes which were composited with CNTs via multi-step deposition process. The obtained samples were analyzed using electron microscopy, energy dispersive X-ray, micro- Raman spectroscopy, X-ray diffraction spectroscopy, photoluminescence spectroscopy and four-point probe current-voltage measurement. The field emission properties of the samples were also studied using FEE measurement. The findings showed that the turn-on and threshold fields of CNTs/ZnO nanocomposites decreased as compared to pristine CNTs. Other than that, different nanostructures of ZnO contributed to the FEE performance of CNTs/ZnO nanocomposites. The best FEE properties were given by the growth of CNTs on ZnO nanoflowers, which has the lowest turn-on field of 0.8 V/?m at current density of 1 ?A/cm2 and a high field enhancement factor of 9417. Larger emission site density and lower screening effect in this sample were believed to affect the FEE performance. As a conclusion, the fabrication of CNTs/ZnO nanocomposites have successfully enhanced the FEE properties of CNTs. Implication of this study is that it provide a new insight on advancing the synthesis of CNTs/ZnO nanocomposites for electron emission devices. 2015 thesis https://ir.upsi.edu.my/detailsg.php?det=1651 https://ir.upsi.edu.my/detailsg.php?det=1651 text eng closedAccess Masters Universiti Pendidikan Sultan Idris Fakulti Sains dan Matematik N/A
institution	Universiti Pendidikan Sultan Idris
collection	UPSI Digital Repository
language	eng
topic	QC Physics
spellingShingle	QC Physics Rika Noor Safitri Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)
description	This study aimed to enhance the field electron emission (FEE) properties of carbon nanotubes (CNTs) synthesized from waste cooking palm oil combined with zinc oxide (ZnO) to produce CNTs/ZnO nanocomposites. The methods used in this study were single and multi-step depositions. The single-step deposition method was done by directly mixing the CNTs and ZnO precursors and they were synthesized using thermal chemical vapor deposition (TCVD) method for 30 minutes. Meanwhile, the multi-step deposition process was carried out by combining TCVD and sol-gel immersion methods to fabricate CNTs/ZnO nanocomposites. There were three different ZnO nanostructures namely nanorods, nanoflowers and nanorods-nanoflakes which were composited with CNTs via multi-step deposition process. The obtained samples were analyzed using electron microscopy, energy dispersive X-ray, micro- Raman spectroscopy, X-ray diffraction spectroscopy, photoluminescence spectroscopy and four-point probe current-voltage measurement. The field emission properties of the samples were also studied using FEE measurement. The findings showed that the turn-on and threshold fields of CNTs/ZnO nanocomposites decreased as compared to pristine CNTs. Other than that, different nanostructures of ZnO contributed to the FEE performance of CNTs/ZnO nanocomposites. The best FEE properties were given by the growth of CNTs on ZnO nanoflowers, which has the lowest turn-on field of 0.8 V/?m at current density of 1 ?A/cm2 and a high field enhancement factor of 9417. Larger emission site density and lower screening effect in this sample were believed to affect the FEE performance. As a conclusion, the fabrication of CNTs/ZnO nanocomposites have successfully enhanced the FEE properties of CNTs. Implication of this study is that it provide a new insight on advancing the synthesis of CNTs/ZnO nanocomposites for electron emission devices.
format	thesis
qualification_name
qualification_level	Master's degree
author	Rika Noor Safitri
author_facet	Rika Noor Safitri
author_sort	Rika Noor Safitri
title	Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)
title_short	Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)
title_full	Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)
title_fullStr	Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)
title_full_unstemmed	Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)
title_sort	enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (ir)
granting_institution	Universiti Pendidikan Sultan Idris
granting_department	Fakulti Sains dan Matematik
publishDate	2015
url	https://ir.upsi.edu.my/detailsg.php?det=1651
_version_	1747832986079854592

Enhancement of field electron emission properties of carbon nanotubes zinc oxide nanocomposites using single and multi step methods (IR)

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