Malaysian Journal of Analytical Sciences Vol 21 No 6 (2017): 1307 - 1315

DOI: 10.17576/mjas-2017-2106-12

 

 

 

MOLECULARLY IMPRINTED TIO₂ INORGANIC FILM AND PVDF/TIO₂ COMPOSITE FILM AS SENSORS FOR THE DETECTION OF CHEMICAL THREAT AGENTS USING QUARTZ CRYSTAL MICROBALANCE

 

(TiO₂ Filem Tak Organik dan Filem Komposit PVDF/TiO₂ Molekul Tercetak sebagai Sensor untuk Mengesan Agen Kimia Berbahaya Menggunakan Penimbang Mikro Kristal Kuarza)

 

Xuan Hao Lin¹, Kah Sing Chooi¹, Sam Fong Yau Li^{1, 2}*

 

¹Department of Chemistry,

National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore

²NUS Environmental Research Institute (NERI),

 #02-01, T-Lab Building (TL), 5A Engineering Drive 1, Singapore 117411, Singapore

 

*Corresponding author:  chmlifys@nus.edu.sg

 

 

Received: 7 November 2016; Accepted: 18 September 2017

 

 

Abstract

In this paper, we report molecularly imprinted TiO₂ inorganic film (MITiO₂) and PVDF/TiO₂ composite film (MIPTiO₂) as sensors for the detection of parathion methyl (PTM), a simulant of chemical threat agent (CTA) using quartz crystal microbalance (QCM). PTM was used as a molecular template for the imprinting of the sensor film. The MITiO₂ showed a greater response (Df 19 Hz) to 9.88 mM of PTM than that (Df 2 Hz) of the MIPTiO₂. The ratios of TiO₂/template and PVDF/TiO₂/template were optimized. Time for the UV degradation of the template was also optimized. MITiO₂ sensor shows good potential for the detection of CTA, other chemical and biochemical pollutants.

 

Keywords:  molecularly imprinted polymer, quartz crystal microbalance, sensor, TiO₂, parathion methyl

 

Abstrak

Dalam kajian ini, kami melaporkan TiO₂ filem tak organik (MITiO₂) dan filem komposit PVDF/TiO₂ (MIPTiO₂) molekul tercetak sebagai sensor untuk mengesan paration metil (PTM), yang merupakan ejen bahan kimia berbahaya (CTA) menggunakan penimbang mikro kristal kuarza (QCM). PTM telah digunakan sebagai templat molekul untuk peneraan filem sensor. MITiO₂ menunjukkan tindak balas yang lebih besar (Df = 19 Hz) pada kepekatan 9.88 mM daripada PTM berbanding MIPTiO₂ (Df = 2 Hz). Nisbah TiO₂/templat dan PVDF/TiO₂/templat telah dioptimumkan. Masa untuk degradasi UV bagi templat juga telah dioptimumkan. Sensor MITiO₂ menunjukkan potensi yang baik untuk mengesan CTA, serta bahan kimia yang lain dan bahan pencemar biokimia.

 

Kata kunci:  polimer molekul tercetak, penimbang mikro kristal kuarza, sensor, TiO₂, paration metil

 

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