Au decorated core-shell structured Au@Pt for the glucose oxidation reaction

Core-shell structured [email protected] nanoparticles (NPs) with Au cores and dendritic Pt shells have been synthesized using the sonochemical method. Then, the Au is electrochemically incorporated into nano-channels between the Pt shells on the [email protected] NPs ([email protected]/Au NPs) to form a non-enzymatic glucose sensor. The electrochemically active surface area (ECSA) of the obtained [email protected]t/Au NPs is enlarged compared with that of [email protected] NPs, which leads to enhanced glucose sensing performance. The particle sizes of [email protected]/Au NPs are in the range from 35 nm to 60 nm. The ECSA of [email protected]/Au NPs is calculated to be 6.19 m2 g(Pt)−1 and 0.8 m2 g(Au)−1 by cyclic voltammetry. The Au incorporation into the Pt shell region can boost the glucose oxidation process even at neutral pH. The sensor performance under the optimized experimental conditions has been confirmed in phosphate buffered saline (PBSsal) solution, showing two wide dynamic ranges for glucose (0.5–10.0 μM and 0.01–10.0 mM) with the correlation coefficient of 0.99. The detection limit of glucose in PBS saline solution has been determined to be 445.7 (±10.3) nM.