Perovskite nanowire-based electrochemical sensing for selective and rapid detection of hydrogen peroxide

Nanowires possess inherent advantages in improving the reduction of boundary stacking defects and enhancing charge transfer or migration. Here, we synthesized all -inorganic perovskite nanowires CsPbBr 3 (PVSK NW) and obtained CsPb 1-x Sn x Br 3 (PVSK-Sn NW) and CsPb 1-x Ge x Br 3 (PVSK-Ge NW) nanowires through doping with different elements (Sn and Ge). Elemental doping endows the nanowires with unique narrow fluorescence spectra, high optical absorption coefficients, tunable optical bandgaps, and high carrier mobility. Introducing different perovskite nanowires into carbon -based composite materials (super p/Nafion) can overcome the challenges of hydrogen peroxide (H 2 O 2 ) detection sensitivity and matrix interference. H 2 O 2 in PBS (phosphate buffered saline) solution (pH 7.0) was detected by current analysis i-t curve mode. The results demonstrate that the addition of perovskite nanowires exhibits a high level of detection sensitivity for H 2 O 2 electrochemical reduction. Particularly, the linear concentration range detected by PVSK-Sn NW is 1-6000 mu M, with a detection limit of 0.12 mu M. Even in the presence of interfering molecules (ascorbic acid, uric acid, glucose), the detection of H 2 O 2 maintains high sensitivity and selectivity. This study overcomes the limitations of perovskite materials in water -based detection, enhancing their future commercial applications as sensing devices.