The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors

Chitosan was used as a sensing material for gas sensing applications. In order to nurture the chitosan properties as a sensing material, chitosan (CS) was blended with polyvinyl alcohol (PVA) and filled with exfoliated graphite (EG). The chitosan films, CS/PVA films and CS/PVA/EG films were characte...

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Format:	Thesis
Language:	English
Subjects:	Chitosan Chitin Graphite Volatile organic compounds Polyvinyl alcohol (PVA) Gas sensor
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72435/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72435/2/Full%20text.pdf
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spelling	my-unimap-724352021-10-14T01:15:55Z The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors Irwana Nainggolan, Dr, Chitosan was used as a sensing material for gas sensing applications. In order to nurture the chitosan properties as a sensing material, chitosan (CS) was blended with polyvinyl alcohol (PVA) and filled with exfoliated graphite (EG). The chitosan films, CS/PVA films and CS/PVA/EG films were characterized to study the effect of EG on microstructure and electrical properties of the composites films. The films casting method has been used to characterize the composite films. The characterization analysis was done using Ultra Violet-Visible (UV-VIS), Four Point Probe (Conductivity testing), X-Ray Diffraction (XRD), Fourier Electron Scanning Electron Microscopy (FESEM) and Fourier Transform Infrared Spectroscopy (FTIR). Chitosan with concentration 1.75 (w/v) % was blended with polyvinyl alcohol (PVA) with concentration 5.00 (v/v) % of ratio 95:5 ml and filled with exfoliated graphite (EG). The results showed that the addition of EG with concentration of 0.8 (w/v) % gives the highest conductivity value of CS/PVA/EG films. The CS/PVA/EG films sensor was deposited on the gold pattern electrode by using electrochemical deposition technique to fabricate the sensor for the ammonia detection. The best electrochemical deposition time and deposition voltage in this study were 6 minutes and 2.5 voltage to fabricate the films sensor. The optimum sensing properties were obtained with CS concentration of 1.75 (w/v) %, CS/PVA ratio of 95:5 ml with PVA concentration of 5.00 (v/v) % and EG concentration of 0.8 (w/v) % upon exposure to wet air. This parameter of CS films sensor and CS/PVA/EG films sensor was used to fabricate the films sensor to test upon exposure of ammonia gas. The CS film sensor and CS/PVA/EG film sensors were exposed to ammonia with different concentration i.e. 10 ppm, 20 ppm, 30 ppm, 40 ppm and 50 ppm to examine the sensing properties of the CS film sensor and CS/PVA/EG film sensors. Universiti Malaysia Perlis (UniMAP) Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72435 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72435/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72435/1/Page%201-24.pdf 3e24854362d4cc8340da7c010be15028 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72435/2/Full%20text.pdf 9d4beec495a10570e8994a30fc58ae2f Universiti Malaysia Perlis (UniMAP) Chitosan Chitin Graphite Volatile organic compounds Polyvinyl alcohol (PVA) Gas sensor School of Materials Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Irwana Nainggolan, Dr,
topic	Chitosan Chitin Graphite Volatile organic compounds Polyvinyl alcohol (PVA) Gas sensor
spellingShingle	Chitosan Chitin Graphite Volatile organic compounds Polyvinyl alcohol (PVA) Gas sensor The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors
description	Chitosan was used as a sensing material for gas sensing applications. In order to nurture the chitosan properties as a sensing material, chitosan (CS) was blended with polyvinyl alcohol (PVA) and filled with exfoliated graphite (EG). The chitosan films, CS/PVA films and CS/PVA/EG films were characterized to study the effect of EG on microstructure and electrical properties of the composites films. The films casting method has been used to characterize the composite films. The characterization analysis was done using Ultra Violet-Visible (UV-VIS), Four Point Probe (Conductivity testing), X-Ray Diffraction (XRD), Fourier Electron Scanning Electron Microscopy (FESEM) and Fourier Transform Infrared Spectroscopy (FTIR). Chitosan with concentration 1.75 (w/v) % was blended with polyvinyl alcohol (PVA) with concentration 5.00 (v/v) % of ratio 95:5 ml and filled with exfoliated graphite (EG). The results showed that the addition of EG with concentration of 0.8 (w/v) % gives the highest conductivity value of CS/PVA/EG films. The CS/PVA/EG films sensor was deposited on the gold pattern electrode by using electrochemical deposition technique to fabricate the sensor for the ammonia detection. The best electrochemical deposition time and deposition voltage in this study were 6 minutes and 2.5 voltage to fabricate the films sensor. The optimum sensing properties were obtained with CS concentration of 1.75 (w/v) %, CS/PVA ratio of 95:5 ml with PVA concentration of 5.00 (v/v) % and EG concentration of 0.8 (w/v) % upon exposure to wet air. This parameter of CS films sensor and CS/PVA/EG films sensor was used to fabricate the films sensor to test upon exposure of ammonia gas. The CS film sensor and CS/PVA/EG film sensors were exposed to ammonia with different concentration i.e. 10 ppm, 20 ppm, 30 ppm, 40 ppm and 50 ppm to examine the sensing properties of the CS film sensor and CS/PVA/EG film sensors.
format	Thesis
title	The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors
title_short	The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors
title_full	The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors
title_fullStr	The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors
title_full_unstemmed	The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors
title_sort	influence of exfoliated graphite on sensing properties of chitosan / pva based ammonia sensors
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Materials Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72435/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72435/2/Full%20text.pdf
_version_	1747836866357362688

The influence of exfoliated graphite on sensing properties of chitosan / PVA based ammonia sensors

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