Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor

Chemiresistive-based sensor using poly(3-hexylthiophene-2,5-diyl) (P3HT) demonstrates high sensitivity and selectivity towards organic compound, however, P3HT can be easily oxidized in natural environment hindering its electrical performance. Thus, highly conductive functionalize multiwalled carbon...

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Main Author:	Nurul Syahirah Nasuha, binti Sa'aya
Format:	Thesis
Language:	English English
Published:	2021
Subjects:	QD Chemistry
Online Access:	http://ir.upnm.edu.my/id/eprint/153/1/PREPARATION%20AND%20CHARACTERIZATION%20%2825%20Pages%29.pdf http://ir.upnm.edu.my/id/eprint/153/2/PREPARATION%20AND%20CHARACTERIZATION%20%28Full%29.pdf
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spelling	my-upnm-ir.1532023-02-13T07:35:30Z Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor 2021-03-16 Nurul Syahirah Nasuha, binti Sa'aya QD Chemistry Chemiresistive-based sensor using poly(3-hexylthiophene-2,5-diyl) (P3HT) demonstrates high sensitivity and selectivity towards organic compound, however, P3HT can be easily oxidized in natural environment hindering its electrical performance. Thus, highly conductive functionalize multiwalled carbon nanotubes (fMWCNT) are introduced to P3HT in order to increase its stability and sensitivity towards malathion. To understand intermolecular interaction between f-MWCNT and P3HT, f-MWCNT (-OH, -COOH, -F and NH2) was introduced as sensing material. The P3HT/f-MWCNT nanocomposites were fabricated using filtration, spin coating, and drop-casting methods. The nanocomposite films were characterized by UV-Vis, Photoluminescence, Fourier Transform Infrared (FTIR), and Raman spectroscopies. FESEM and HR-TEM images were used to analyse the P3HT wrapped f-MWCNT nanostructures. The I-V measurement were used to examine the stability and sensitivity of the sensor. FTIR spectra of P3HT/f-MWCNT shows three major regions of vibrational modes; (i) C-H vibration belonged to aliphatic chain of hexyl groups, (ii) C=C stretching modes, and (iii) 909 cm-1 peak that represented out-of-plane bending vibration of cis-HC=CH- group. The last peak arises from the effect of crystallinity in P3HT chains. G-band peak shift in Raman spectra and increase of ID/IG ratio is due to formation of more ordered structures after the polymer incorporation. The origin of -π interaction between P3HT and f-MWCNT was also detected in UVvisible absorption and photoluminescence spectra. The electron images revealed noncovalent polymer wrapping on f-MWCNT as evidenced by increase in f-MWCNTs’ diameter. According to our amperometric studies, P3HT wrapped f-MWCNT showed promising sensitivity in detecting the organophosphate (OP) simulant, malathion. The sensitivity towards malathion was examined using current-voltage characterization in range 0.1 to 500 ppb. The calculated limit of detection (LOD) was 0.07 ppb. Our findings concluded that functional group on MWCNT especially the -OH group, π-π stacking population, π-electron H interaction and hydrophobic surface play an important role in giving improved sensitivity of polymer CNT based chemiresistive sensor. 2021-03 Thesis http://ir.upnm.edu.my/id/eprint/153/ http://ir.upnm.edu.my/id/eprint/153/1/PREPARATION%20AND%20CHARACTERIZATION%20%2825%20Pages%29.pdf text en public http://ir.upnm.edu.my/id/eprint/153/2/PREPARATION%20AND%20CHARACTERIZATION%20%28Full%29.pdf text en validuser mphil masters Universiti Pertahanan Nasional Malaysia Centre For Graduate Studies
institution	Universiti Pertahanan Nasional Malaysia
collection	UPNM Institutional Repository
language	English English
topic	QD Chemistry
spellingShingle	QD Chemistry Nurul Syahirah Nasuha, binti Sa'aya Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor
description	Chemiresistive-based sensor using poly(3-hexylthiophene-2,5-diyl) (P3HT) demonstrates high sensitivity and selectivity towards organic compound, however, P3HT can be easily oxidized in natural environment hindering its electrical performance. Thus, highly conductive functionalize multiwalled carbon nanotubes (fMWCNT) are introduced to P3HT in order to increase its stability and sensitivity towards malathion. To understand intermolecular interaction between f-MWCNT and P3HT, f-MWCNT (-OH, -COOH, -F and NH2) was introduced as sensing material. The P3HT/f-MWCNT nanocomposites were fabricated using filtration, spin coating, and drop-casting methods. The nanocomposite films were characterized by UV-Vis, Photoluminescence, Fourier Transform Infrared (FTIR), and Raman spectroscopies. FESEM and HR-TEM images were used to analyse the P3HT wrapped f-MWCNT nanostructures. The I-V measurement were used to examine the stability and sensitivity of the sensor. FTIR spectra of P3HT/f-MWCNT shows three major regions of vibrational modes; (i) C-H vibration belonged to aliphatic chain of hexyl groups, (ii) C=C stretching modes, and (iii) 909 cm-1 peak that represented out-of-plane bending vibration of cis-HC=CH- group. The last peak arises from the effect of crystallinity in P3HT chains. G-band peak shift in Raman spectra and increase of ID/IG ratio is due to formation of more ordered structures after the polymer incorporation. The origin of -π interaction between P3HT and f-MWCNT was also detected in UVvisible absorption and photoluminescence spectra. The electron images revealed noncovalent polymer wrapping on f-MWCNT as evidenced by increase in f-MWCNTs’ diameter. According to our amperometric studies, P3HT wrapped f-MWCNT showed promising sensitivity in detecting the organophosphate (OP) simulant, malathion. The sensitivity towards malathion was examined using current-voltage characterization in range 0.1 to 500 ppb. The calculated limit of detection (LOD) was 0.07 ppb. Our findings concluded that functional group on MWCNT especially the -OH group, π-π stacking population, π-electron H interaction and hydrophobic surface play an important role in giving improved sensitivity of polymer CNT based chemiresistive sensor.
format	Thesis
qualification_name	Master of Philosophy (MPhil)
qualification_level	Master's degree
author	Nurul Syahirah Nasuha, binti Sa'aya
author_facet	Nurul Syahirah Nasuha, binti Sa'aya
author_sort	Nurul Syahirah Nasuha, binti Sa'aya
title	Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor
title_short	Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor
title_full	Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor
title_fullStr	Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor
title_full_unstemmed	Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor
title_sort	preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor
granting_institution	Universiti Pertahanan Nasional Malaysia
granting_department	Centre For Graduate Studies
publishDate	2021
url	http://ir.upnm.edu.my/id/eprint/153/1/PREPARATION%20AND%20CHARACTERIZATION%20%2825%20Pages%29.pdf http://ir.upnm.edu.my/id/eprint/153/2/PREPARATION%20AND%20CHARACTERIZATION%20%28Full%29.pdf
_version_	1813223567157886976

Preparation and characterization of poly(3 hexylthiophene)/multiwalled carbon nanotubes composites for malathion chemiresistive sensor

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