Sensing properties of deformed graphene nanoribbon through warping

Semiconductor materials have become the fundamental building block in the design of gas sensor. Previous researchers work on gas sensor that recognized its limitations such as low binding energy, low sensitivity and poor selectivity. As an alternative, considerable interests have generated in carbon...

Full description

Saved in:

Bibliographic Details
Main Author:	Shamim Husain, Sakina
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/79026/1/SakinaShamimHusainMFKE2017.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.79026
record_format	uketd_dc
spelling	my-utm-ep.790262018-09-27T04:14:35Z Sensing properties of deformed graphene nanoribbon through warping 2017-12 Shamim Husain, Sakina TK Electrical engineering. Electronics Nuclear engineering Semiconductor materials have become the fundamental building block in the design of gas sensor. Previous researchers work on gas sensor that recognized its limitations such as low binding energy, low sensitivity and poor selectivity. As an alternative, considerable interests have generated in carbon based material like graphene to improve the sensing device performance. The purpose of this study is to investigate the sensing behaviour of deformed armchair graphene nanoribbon (AGNR) through warping using Extended-Huckel Theory (EHT) coupled with Non- Equilibrium Green Function (NEGF). The AGNR are warped upward and inward at angles of 180o, 270o and 360o. The sensing properties are measured for oxygen (O2) and ammonia (NH3) molecules, particularly on their binding energy, charge transfer and sensitivity. Generally, inward warped AGNR shows better performance compared to upward deformation. Three AGNR configurations have been investigated; 3m, 3m+1 and 3m+2, where m known as an integer. Performance of each AGNR configuration behaves differently with the applied warping. Simulation results have indicated that for upward 3m configuration, the warping AGNR exhibit 98% enhancement in binding energy when warped at 360o for NH3 molecule. While for 3m+1 and 3m+2 the binding energy exhibit 72% and 64% improvement respectively. The same trend of observation is achieved for O2 molecules. The results obtained also discovered a chemisorption in 3m, 3m+1 and 3m+2 configuration for both O2 and NH3. For 3m and 3m+1 configurations, the sensitivity has been observed at twoorder of magnitude for higher warping angles, which most previous studies have not achieved. Meanwhile, negative sensitivity is observed in 3m+2 configuration. The marked improvement of the warped AGNR sensing properties is attributed from the combination of strain and curvature effect. The warping can also be an alternative method to minimize drawbacks in traditional gas sensors. The sensitivity of gas sensor could be enhanced by introducing the warped AGNR. 2017-12 Thesis http://eprints.utm.my/id/eprint/79026/ http://eprints.utm.my/id/eprint/79026/1/SakinaShamimHusainMFKE2017.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:109563 phd doctoral Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Shamim Husain, Sakina Sensing properties of deformed graphene nanoribbon through warping
description	Semiconductor materials have become the fundamental building block in the design of gas sensor. Previous researchers work on gas sensor that recognized its limitations such as low binding energy, low sensitivity and poor selectivity. As an alternative, considerable interests have generated in carbon based material like graphene to improve the sensing device performance. The purpose of this study is to investigate the sensing behaviour of deformed armchair graphene nanoribbon (AGNR) through warping using Extended-Huckel Theory (EHT) coupled with Non- Equilibrium Green Function (NEGF). The AGNR are warped upward and inward at angles of 180o, 270o and 360o. The sensing properties are measured for oxygen (O2) and ammonia (NH3) molecules, particularly on their binding energy, charge transfer and sensitivity. Generally, inward warped AGNR shows better performance compared to upward deformation. Three AGNR configurations have been investigated; 3m, 3m+1 and 3m+2, where m known as an integer. Performance of each AGNR configuration behaves differently with the applied warping. Simulation results have indicated that for upward 3m configuration, the warping AGNR exhibit 98% enhancement in binding energy when warped at 360o for NH3 molecule. While for 3m+1 and 3m+2 the binding energy exhibit 72% and 64% improvement respectively. The same trend of observation is achieved for O2 molecules. The results obtained also discovered a chemisorption in 3m, 3m+1 and 3m+2 configuration for both O2 and NH3. For 3m and 3m+1 configurations, the sensitivity has been observed at twoorder of magnitude for higher warping angles, which most previous studies have not achieved. Meanwhile, negative sensitivity is observed in 3m+2 configuration. The marked improvement of the warped AGNR sensing properties is attributed from the combination of strain and curvature effect. The warping can also be an alternative method to minimize drawbacks in traditional gas sensors. The sensitivity of gas sensor could be enhanced by introducing the warped AGNR.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Shamim Husain, Sakina
author_facet	Shamim Husain, Sakina
author_sort	Shamim Husain, Sakina
title	Sensing properties of deformed graphene nanoribbon through warping
title_short	Sensing properties of deformed graphene nanoribbon through warping
title_full	Sensing properties of deformed graphene nanoribbon through warping
title_fullStr	Sensing properties of deformed graphene nanoribbon through warping
title_full_unstemmed	Sensing properties of deformed graphene nanoribbon through warping
title_sort	sensing properties of deformed graphene nanoribbon through warping
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2017
url	http://eprints.utm.my/id/eprint/79026/1/SakinaShamimHusainMFKE2017.pdf
_version_	1747818128928145408

Sensing properties of deformed graphene nanoribbon through warping

Similar Items