Surfactant-free synthesis of CuBr NPs decorated by Pt for glucose and nitrite sensors

The high cost and narrow detection range of electrocatalyst are the two major challenges for the electro-chemical biosensors. This work provided a surfactant-free synthesis of CuBr@Pt nanoparticles (CuBr@Pt NPs) with controllable Pt loading rates. The introduction of chloroplatinic acid (H2PtCl6) and an elevated synthesis temperature resulted in a high surface area for CuBr@Pt NPs. The abundant active sites enabled the CuBr@Pt NPs a superior performance as applied in glucose and nitrite detection. Moreover, an optimal Pt loading would be conducive to optimize sensor performances of CuBr@Pt NPs. In the glucose detection, the sensor by CuBr@Pt-15% could reach the detection concentration up to 68.0 mM, which was 1.9 times higher than that by pure CuBr. And the corresponding sensitivity by CuBr@Pt-15% was calculated to be 382.73 lA/mM & BULL;cm2. In the detection of sodium nitrite, CuBr@Pt-15% also revealed a superior behavior than previous work. And the detection concentration (by the linear sweep voltammetry) was form 0 to 80.0 mM. This work demonstrated the superior biosensor performance of CuBr@Pt-15%, which offered a promising material for sensor with wider detection range and rationalized cost.& COPY; 2023 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.