Electrochemical impedance spectroscopy based MEMS sensors for phthalates detection in water and juices

Handle URI:
http://hdl.handle.net/10754/550211
Title:
Electrochemical impedance spectroscopy based MEMS sensors for phthalates detection in water and juices
Authors:
Zia, Asif I; Syaifudin, A R Mohd; Mukhopadhyay, S C; Yu, P L; Al-Bahadly, I H; Gooneratne, Chinthaka P; Kosel, Jürgen ( 0000-0002-8998-8275 ) ; Liao, Tai-Shan
Abstract:
Phthalate esters are ubiquitous environmental and food pollutants well known as endocrine disrupting compounds (EDCs). These developmental and reproductive toxicants pose a grave risk to the human health due to their unlimited use in consumer plastic industry. Detection of phthalates is strictly laboratory based time consuming and expensive process and requires expertise of highly qualified and skilled professionals. We present a real time, non-invasive, label free rapid detection technique to quantify phthalates' presence in deionized water and fruit juices. Electrochemical impedance spectroscopy (EIS) technique applied to a novel planar inter-digital (ID) capacitive sensor plays a vital role to explore the presence of phthalate esters in bulk fluid media. The ID sensor with multiple sensing gold electrodes was fabricated on silicon substrate using micro-electromechanical system (MEMS) device fabrication technology. A thin film of parylene C polymer was coated as a passivation layer to enhance the capacitive sensing capabilities of the sensor and to reduce the magnitude of Faradic current flowing through the sensor. Various concentrations, 0.002ppm through to 2ppm of di (2-ethylhexyl) phthalate (DEHP) in deionized water, were exposed to the sensing system by dip testing method. Impedance spectra obtained was analysed to determine sample conductance which led to consequent evaluation of its dielectric properties. Electro-chemical impedance spectrum analyser algorithm was employed to model the experimentally obtained impedance spectra. Curve fitting technique was applied to deduce constant phase element (CPE) equivalent circuit based on Randle's equivalent circuit model. The sensing system was tested to detect different concentrations of DEHP in orange juice as a real world application. The result analysis indicated that our rapid testing technique is able to detect the presence of DEHP in all test samples distinctively.
KAUST Department:
Sensing, Magnetism and Microsystems Lab
Citation:
Electrochemical impedance spectroscopy based MEMS sensors for phthalates detection in water and juices 2013, 439:012026 Journal of Physics: Conference Series
Publisher:
IOP Publishing
Journal:
Journal of Physics: Conference Series
Conference/Event name:
6th Vacuum and Surface Sciences Conference of Asia and Australia, VASSCAA 2012
Issue Date:
10-Jun-2013
DOI:
10.1088/1742-6596/439/1/012026
Type:
Conference Paper
ISSN:
1742-6596
Additional Links:
http://stacks.iop.org/1742-6596/439/i=1/a=012026?key=crossref.d2043940d85d7157d060cf0f7b44d58b
Appears in Collections:
Conference Papers; Sensing, Magnetism and Microsystems Lab

Full metadata record

DC FieldValue Language
dc.contributor.authorZia, Asif Ien
dc.contributor.authorSyaifudin, A R Mohden
dc.contributor.authorMukhopadhyay, S Cen
dc.contributor.authorYu, P Len
dc.contributor.authorAl-Bahadly, I Hen
dc.contributor.authorGooneratne, Chinthaka Pen
dc.contributor.authorKosel, Jürgenen
dc.contributor.authorLiao, Tai-Shanen
dc.date.accessioned2015-04-16T13:49:27Zen
dc.date.available2015-04-16T13:49:27Zen
dc.date.issued2013-06-10en
dc.identifier.citationElectrochemical impedance spectroscopy based MEMS sensors for phthalates detection in water and juices 2013, 439:012026 Journal of Physics: Conference Seriesen
dc.identifier.issn1742-6596en
dc.identifier.doi10.1088/1742-6596/439/1/012026en
dc.identifier.urihttp://hdl.handle.net/10754/550211en
dc.description.abstractPhthalate esters are ubiquitous environmental and food pollutants well known as endocrine disrupting compounds (EDCs). These developmental and reproductive toxicants pose a grave risk to the human health due to their unlimited use in consumer plastic industry. Detection of phthalates is strictly laboratory based time consuming and expensive process and requires expertise of highly qualified and skilled professionals. We present a real time, non-invasive, label free rapid detection technique to quantify phthalates' presence in deionized water and fruit juices. Electrochemical impedance spectroscopy (EIS) technique applied to a novel planar inter-digital (ID) capacitive sensor plays a vital role to explore the presence of phthalate esters in bulk fluid media. The ID sensor with multiple sensing gold electrodes was fabricated on silicon substrate using micro-electromechanical system (MEMS) device fabrication technology. A thin film of parylene C polymer was coated as a passivation layer to enhance the capacitive sensing capabilities of the sensor and to reduce the magnitude of Faradic current flowing through the sensor. Various concentrations, 0.002ppm through to 2ppm of di (2-ethylhexyl) phthalate (DEHP) in deionized water, were exposed to the sensing system by dip testing method. Impedance spectra obtained was analysed to determine sample conductance which led to consequent evaluation of its dielectric properties. Electro-chemical impedance spectrum analyser algorithm was employed to model the experimentally obtained impedance spectra. Curve fitting technique was applied to deduce constant phase element (CPE) equivalent circuit based on Randle's equivalent circuit model. The sensing system was tested to detect different concentrations of DEHP in orange juice as a real world application. The result analysis indicated that our rapid testing technique is able to detect the presence of DEHP in all test samples distinctively.en
dc.publisherIOP Publishingen
dc.relation.urlhttp://stacks.iop.org/1742-6596/439/i=1/a=012026?key=crossref.d2043940d85d7157d060cf0f7b44d58ben
dc.rightsContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en
dc.titleElectrochemical impedance spectroscopy based MEMS sensors for phthalates detection in water and juicesen
dc.typeConference Paperen
dc.contributor.departmentSensing, Magnetism and Microsystems Laben
dc.identifier.journalJournal of Physics: Conference Seriesen
dc.conference.date2012-10-09 to 2012-10-13en
dc.conference.name6th Vacuum and Surface Sciences Conference of Asia and Australia, VASSCAA 2012en
dc.conference.locationIslamabad, PAKen
dc.eprint.versionPublisher's Version/PDFen
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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