Fabrication And Performance Of Non-Enzymatic Glucose Sensor Based On Hollow Nanostructured Pt Materials

Platinum?Pt?is one of the mostly researched noble metals in the fields of catalysts and sensors.In particular,its stability in electrochemical reactions and its prominent catalytic activity are the most attractive parameters for the fabrication of sensor devices.But single Pt materials suffer from high cost,low sensitivity and easier to be poisoned when used as sensors.Two aspects are involved to improve the Pt-based materials as electrochemical non-emzymetic glucose sensor.For the materials,Pt-Ni and Pt-Ag alloy are fabricated,for the structures,we prepared nanotubes array and hollow nanoparticles suppored by graphene.The glucose sensor electrode based on Pt-Ni nanotubes array?Pt-Ni NTA?which are prepared by constant current electro-deposition within the anodic alumina membrane and galvanic replacement reaction.The amperometric detection of glucose shows a wide linear range up to 13.5 mM with a high sensitivity of 124.17 ?A mM^-1 cm^-2 and a low detection limit of 32 ?M?S/N = 3?.More important,another attractive feature of the Pt-Ni NTA electrode is the quite low working potential at-0.35 V?versus SCE?,which is favor for avoiding the influence of possible intermediates.Furthermore,the Pt-Ni nanotubes array glucose sensor reveals good stability and repeatability.The composites of rGO and Pt-Ag alloy hollow nanoparticles?Pt-Ag HNPs/rGO?are prepared and used as non-emzymetic glucose sensor.The Pt-Ag HNPs/rGO is fabricated via two-step process.Firstly,the reduction of as-prepared GO and Ag particles are simultaneously took place by using hydrazine hydrate as reducing agent.Sencondly,Pt-Ag alloy hollow nanoparticles is produced by facile galvanic replacement reaction.The morphology,composition,structure and electrochemical catalytic oxidation performance towards glucose of Pt-Ag HNPs/rGO electrodes were studied and show good electrochemical performances.The amperometric detection of glucose shows a wide linear range up to 7.3 mM with a high sensitivity of 74.66 ?A mM^-1 cm^-2 and a low detection limit of 2.8 ?M?S/N = 3?.The Pt-Ag HNPs/rGO glucose sensor reveals good anti-interference performance towards AA,UA,DA,AP and fructose as well as good stability and repeatability.