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Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation

Herein, doping/decoration of gold nanoparticles (AuNPs) within mesoporous silica-titania nanocomposite is achieved via a facile and co-assembly sol-gel method. Polyethylene glycol is used as a co-structure-directing-agent. For sensing analysis, a mixture of organic dyes i.e., bromophenol blue, pheno...

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Main Authors: Islam, Shumaila, Bakhtiar, Hazri, Alshoaibi, Adil, Riaz, Saira, Naseem, Shahzad
Format: Article
Published: Elsevier B.V. 2020
Subjects:
QC Physics
Online Access:http://eprints.utm.my/id/eprint/93350/
http://dx.doi.org/10.1016/j.apsusc.2020.146329
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spelling my.utm.933502021-11-30T08:28:45Z http://eprints.utm.my/id/eprint/93350/ Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation Islam, Shumaila Bakhtiar, Hazri Alshoaibi, Adil Riaz, Saira Naseem, Shahzad QC Physics Herein, doping/decoration of gold nanoparticles (AuNPs) within mesoporous silica-titania nanocomposite is achieved via a facile and co-assembly sol-gel method. Polyethylene glycol is used as a co-structure-directing-agent. For sensing analysis, a mixture of organic dyes i.e., bromophenol blue, phenol red, and cresol red is encapsulated in the AuST nanocomposite matrix. FESEM/EDX analysis shows a crack-free surface, porous network and uniform distribution of Au, Ti, Si, along with dye species. FTIR and XRD suggested the heterogeneous chemical bonding and crystallite size 24 nm after encapsulation. AuST nanocomposite shows thermally stable behavior after 450 °C even after co-dyes encapsulation. High surface area 322 ± 2.5 m2/g, pore diameter 30.2 Å, and pore volume 0.24 cm3/g, average surface roughness 10 nm, and refractive index 1.29 is advantageous for good sensing response at pH 1–12. The sensitivity is measured as 10 counts/pH at 441 nm. Moreover, good reversible response, fast response time 2.1 sec in acidic media, and 0.9 sec in basic media is observed. Elsevier B.V. 2020 Article PeerReviewed Islam, Shumaila and Bakhtiar, Hazri and Alshoaibi, Adil and Riaz, Saira and Naseem, Shahzad (2020) Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation. Applied Surface Science, 521 . ISSN 0169-4332 http://dx.doi.org/10.1016/j.apsusc.2020.146329
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic QC Physics
spellingShingle QC Physics
Islam, Shumaila
Bakhtiar, Hazri
Alshoaibi, Adil
Riaz, Saira
Naseem, Shahzad
Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation
description Herein, doping/decoration of gold nanoparticles (AuNPs) within mesoporous silica-titania nanocomposite is achieved via a facile and co-assembly sol-gel method. Polyethylene glycol is used as a co-structure-directing-agent. For sensing analysis, a mixture of organic dyes i.e., bromophenol blue, phenol red, and cresol red is encapsulated in the AuST nanocomposite matrix. FESEM/EDX analysis shows a crack-free surface, porous network and uniform distribution of Au, Ti, Si, along with dye species. FTIR and XRD suggested the heterogeneous chemical bonding and crystallite size 24 nm after encapsulation. AuST nanocomposite shows thermally stable behavior after 450 °C even after co-dyes encapsulation. High surface area 322 ± 2.5 m2/g, pore diameter 30.2 Å, and pore volume 0.24 cm3/g, average surface roughness 10 nm, and refractive index 1.29 is advantageous for good sensing response at pH 1–12. The sensitivity is measured as 10 counts/pH at 441 nm. Moreover, good reversible response, fast response time 2.1 sec in acidic media, and 0.9 sec in basic media is observed.
format Article
author Islam, Shumaila
Bakhtiar, Hazri
Alshoaibi, Adil
Riaz, Saira
Naseem, Shahzad
author_facet Islam, Shumaila
Bakhtiar, Hazri
Alshoaibi, Adil
Riaz, Saira
Naseem, Shahzad
author_sort Islam, Shumaila
title Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation
title_short Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation
title_full Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation
title_fullStr Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation
title_full_unstemmed Thermally stable Au decorated silica-titania mesoporous nanocomposite for pH sensing evaluation
title_sort thermally stable au decorated silica-titania mesoporous nanocomposite for ph sensing evaluation
publisher Elsevier B.V.
publishDate 2020
url http://eprints.utm.my/id/eprint/93350/
http://dx.doi.org/10.1016/j.apsusc.2020.146329
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score 13.211869

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