Introducing molecular selectivity in rapid impedimetric sensing of phthalates

Handle URI:
http://hdl.handle.net/10754/564919
Title:
Introducing molecular selectivity in rapid impedimetric sensing of phthalates
Authors:
Zia, Asif I.; Mukhopadhyay, Subhas Chandra; Al-Bahadly, Ibrahim H.; Yu, Paklam; Gooneratne, Chinthaka Pasan; Kosel, Jürgen ( 0000-0002-8998-8275 )
Abstract:
This research article reports a real-time and non-invasive detection technique for phthalates in liquids by Electrochemical Impedance Spectroscopy (EIS), incorporating molecular imprinting technique to introduce selectivity for the phthalate molecule in the detection system. A functional polymer with Bis (2-ethylhexyl) phthalate (DEHP) template was immobilized on the sensing surface of the inter-digital (ID) capacitive sensor with sputtered gold sensing electrodes fabricated over a native layer of silicon dioxide on a single crystal silicon substrate. Various concentrations (10 to 200 ppm) of DEHP in deionized MilliQ water were exposed to the sensor surface functionalized with molecular imprinted polymer (MIP) in order to capture the analyte molecule, hence introducing molecular selectivity to the testing system. Impedance spectra were obtained using EIS in order to determine sample conductance for evaluation of phthalate concentration in the solution. Electrochemical Spectrum Analyzer algorithm was used to deduce equivalent circuit and equivalent component parameters from the experimentally obtained impedance spectra employing Randle's cell model curve fitting technique. Experimental results confirmed that the immobilization of the functional polymer on sensing surface introduces selectivity for phthalates in the sensing system. The results were validated by testing the samples using High Performance Liquid Chromatography (HPLC-DAD). © 2014 IEEE.
KAUST Department:
Sensing, Magnetism and Microsystems Lab; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Electrical Engineering Program
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings
Conference/Event name:
2014 IEEE International Instrumentation and Measurement Technology Conference: Instrumentation and Measurement for Sustainable Development, I2MTC 2014
Issue Date:
May-2014
DOI:
10.1109/I2MTC.2014.6860861
Type:
Conference Paper
ISSN:
10915281
ISBN:
9781467363853
Appears in Collections:
Conference Papers; Electrical Engineering Program; Sensing, Magnetism and Microsystems Lab; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZia, Asif I.en
dc.contributor.authorMukhopadhyay, Subhas Chandraen
dc.contributor.authorAl-Bahadly, Ibrahim H.en
dc.contributor.authorYu, Paklamen
dc.contributor.authorGooneratne, Chinthaka Pasanen
dc.contributor.authorKosel, Jürgenen
dc.date.accessioned2015-08-04T07:25:10Zen
dc.date.available2015-08-04T07:25:10Zen
dc.date.issued2014-05en
dc.identifier.isbn9781467363853en
dc.identifier.issn10915281en
dc.identifier.doi10.1109/I2MTC.2014.6860861en
dc.identifier.urihttp://hdl.handle.net/10754/564919en
dc.description.abstractThis research article reports a real-time and non-invasive detection technique for phthalates in liquids by Electrochemical Impedance Spectroscopy (EIS), incorporating molecular imprinting technique to introduce selectivity for the phthalate molecule in the detection system. A functional polymer with Bis (2-ethylhexyl) phthalate (DEHP) template was immobilized on the sensing surface of the inter-digital (ID) capacitive sensor with sputtered gold sensing electrodes fabricated over a native layer of silicon dioxide on a single crystal silicon substrate. Various concentrations (10 to 200 ppm) of DEHP in deionized MilliQ water were exposed to the sensor surface functionalized with molecular imprinted polymer (MIP) in order to capture the analyte molecule, hence introducing molecular selectivity to the testing system. Impedance spectra were obtained using EIS in order to determine sample conductance for evaluation of phthalate concentration in the solution. Electrochemical Spectrum Analyzer algorithm was used to deduce equivalent circuit and equivalent component parameters from the experimentally obtained impedance spectra employing Randle's cell model curve fitting technique. Experimental results confirmed that the immobilization of the functional polymer on sensing surface introduces selectivity for phthalates in the sensing system. The results were validated by testing the samples using High Performance Liquid Chromatography (HPLC-DAD). © 2014 IEEE.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.titleIntroducing molecular selectivity in rapid impedimetric sensing of phthalatesen
dc.typeConference Paperen
dc.contributor.departmentSensing, Magnetism and Microsystems Laben
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentElectrical Engineering Programen
dc.identifier.journal2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedingsen
dc.conference.date12 May 2014 through 15 May 2014en
dc.conference.name2014 IEEE International Instrumentation and Measurement Technology Conference: Instrumentation and Measurement for Sustainable Development, I2MTC 2014en
dc.conference.locationMontevideoen
dc.contributor.institutionSchool of Engineering and Advanced Technology, Massey University, Palmerston North, New Zealanden
kaust.authorGooneratne, Chinthaka Pasanen
kaust.authorKosel, Jürgenen
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