Evaluation of monolayers and mixed monolayers formed from mercaptobenzothiazole and decanethiol as sensing platforms |
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| Affiliation: | 1. CSIR–Central Electrochemical Research Institute, Karaikudi, 630006, India;2. Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India;3. Department of Mechanical Engineering, Thiagarajar College of Engineering, Madurai 625015, India;1. Department of Chemistry, Madras Christian College, Affiliated to University of Madras, Tambaram, Chennai, Tamil Nadu 600 059, India;2. Department of Chemistry, B.S.A. Crescent Institute of Science and Technology, Vandalur, Chennai 600048, Tamil Nadu, India;1. Department of Biological Sciences, Birla Institute of Technology and Science, Pilani-Hyderabad campus, Jawahar Nagar, Shameerpet Mandal, Hyderabad 500078, India;2. Department of Chemistry, Birla Institute of Technology and Science, Pilani-Hyderabad campus, Jawahar Nagar, Shameerpet Mandal, Hyderabad 500078, India;1. Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Aptdo 1203, 41071 Sevilla, Spain;2. Instituto de Investigaciones Químicas, CSIC–Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain |
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| Abstract: | In this investigation, the characterisation of monolayer and mixed monolayers formed from mercaptobenzothiazole (MBT) and decanethiol (DT) has been carried out with cyclic voltammetry. The SAMs have been tested for their stability and electron transfer blocking properties. The redox probes used in the present study are Fe(CN)6]4−, Ru(NH3)6]2+ and Cu underpotential deposition (upd). The electron transfer kinetics is investigated in acid and neutral pH range. Electron transfer kinetics is altered by the nature of charge on the redox probe and the charge on the monolayer. Electron transfer kinetics of negatively charged redox probes like ferrocyanide ions is blocked when the surface pKa<pHmedium and at pKa>pHmedium reversible features is observed for negatively charged probes. An exactly reverse effect is observed in the case of positively charged redox species like Ru(NH3)6]2+/3+.Cu under potential deposition studies reflects the structural integrity and compactness of the SAM layer. The utility of these monolayers and mixed monolayer for selective sensing of dopamine is discussed based on their ability to discriminate between positively and negatively charged redox species at different pH. |
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