Grafting of diaminoalkane on glassy carbon surface and its functionalization |
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| Institution: | 1. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China;2. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;3. Chongqing Academy of Metrology and Quality Inspection, Chongqing 400044, China;4. Pangang Group Research Institute co., Ltd., Panzhihua, 617000, China;1. School of Chemistry, Monash University, Clayton, Victoria 3800, Australia;2. School of Applied Sciences, RMIT University, GPO Box 2476V, VIC 3001, Melbourne, Australia;3. Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia;4. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, QLD 4001, Brisbane, Australia |
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| Abstract: | Diaminoalkanes (NH2(CH2)nNH2, n=7,10,12) were grafted onto a glassy carbon electrode (GCE) surface by amino cation radical formed during electrooxidation of amino group. The presence of diamine grafted layer at the GCE is demonstrated by X-ray photoelectron spectroscopy. The effect of the grafted layer at the GCE surface on the redox responses of Ru(NH3)63+ and Fe(CN)63− redox probes has been investigated. Electrochemical impedance experiments indicate that the kinetics of electron transfer are slowed down when the scan rate taken to modify the GCE is low, and that diaminoalkane with longer alkyl-chain used has higher blocking characteristics. The amine-functionalized GCE is versatile not only to further covalently immobilize ferrocene acetic acid via carbodiimide coupling, but also as a charge-rich substrate to successfully adsorb heteropolyanion P2W18 in acidic solution by electrostatic interaction. |
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