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Development of a capacitive chemical sensor based on Co(II)-phthalocyanine acrylate-polymer/HfO2/SiO2/Si for detection of perchlorate

Abstract : We report the development of a chemical sensor based on a Co(II) phthalocyanine acrylate polymer (Co(II)Pc-AP) for perchlorate anion detection. We have used two types of transducers, silicon nitride (Si3N4) and hafnium oxide (HfO2). The adhesion of the Co(11)Pc-AP on different transducers and their surface qualities have been studied by contact angle measurements. We haNe studied the pH effect on AllSi/SiO2/HfO2/electrolyte capacitance values for different phosphate buffer solutions (PBS). This optimization step has allowed a sensitivity value of about 44 mV decade-1 towards H+ ions. The fabricated sensors based on Si3N4 and HfO2 transducers functionalized with a Co(11)Pc-AP membrane have been characterized by C(V) measurements for different perchlorate concentrations (from 10-7 to 10-2M). The sensor developed with the HfO2 transducer shows better performances compared to that based on Si3N4: a larger detection range (10(-7) to 10(-2) and 10(-3) to 10(-2) M, respectively) and lower detection limits (10-7 and 10(-3) M). The specificities of our perchlorate sensor have been tested for some interfering ions (nitrate, sulfate and carbonate).
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https://hal.archives-ouvertes.fr/hal-01275385
Contributor : Agnès Bussy <>
Submitted on : Wednesday, February 17, 2016 - 1:41:07 PM
Last modification on : Friday, April 17, 2020 - 5:16:02 PM

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M Braik, C. Dridi, M Ben Ali, M Ali, M Abbas, et al.. Development of a capacitive chemical sensor based on Co(II)-phthalocyanine acrylate-polymer/HfO2/SiO2/Si for detection of perchlorate . Journal of sensors and sensors systems, COPERNICUS GESELLSCHAFT MBH, 2015, 4 (1), pp.17-23. ⟨10.5194/jsss-4-17-2015⟩. ⟨hal-01275385⟩

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