Articles | Volume 4, issue 1
J. Sens. Sens. Syst., 4, 17–23, 2015

Special issue: Advanced functional materials for environmental monitoring...

J. Sens. Sens. Syst., 4, 17–23, 2015

Regular research article 16 Jan 2015

Regular research article | 16 Jan 2015

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

M. Braik1,2, C. Dridi1,2,3, M. Ben Ali1,2, M. Ali4, M. Abbas4, M. Zabala5, J. Bausells5, N. Zine6, N. Jaffrezic-Renault6, and A. Errachid6 M. Braik et al.
  • 1Université de Monastir, LIMA, Faculté des Sciences de Monastir, 5019 Monastir, Tunisia
  • 2Université de Sousse, ISSAT de Sousse, Cité Ettafala, 4003 Ibn Khaldoun Sousse, Tunisia
  • 3Centre for Research on Microelectronics and Nanotechnology of Sousse, Technopole of Sousse B.P334 Sahloul 6 4034 Sousse, Tunisia
  • 4Analytical Laboratory, Department of Applied Organic Chemistry, National Research Centre, Cairo, Egypt
  • 5Centro National of Microelectronica (IMB-CSIC), Campus UAB, 08193 Bellaterra, Barcelona, Spain
  • 6Institut des Sciences Analytiques (ISA), Université Lyon, Université de Claude Bernard Lyon 1, UMR 5280, 5 rue de la Doua, 69100 Villeurbanne, France

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(II)Pc-AP on different transducers and their surface qualities have been studied by contact angle measurements. We have studied the pH effect on Al/Si/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(II)Pc-AP membrane have been characterized by C(V) measurements for different perchlorate concentrations (from 10−7 to 10−2 M). 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).