A Selective Electrochemical Dopamine Sensor Based on Siloxene Nanosheet

In this paper, we present a novel, highly selective and sensitive dopamine sensor based on two-dimensional siloxene sheets. Siloxene sheets have been prepared by the topotactic conversion of CaSi and the structural, morphology characteristic are analyzed by various physico-chemical tools. The dopamine detection with the fabricated electrode is evaluated by electrochemical measurements, and the electrode exhibited an excellent selectivity of dopamine sensing with a detection limit of 0.327 mu mathrm{M}. Moreover, the proposed sensor displayed a wide linear response (10 to 190 mu mathrm{M} and 200 mu mathrm{M} to 1.1mM) towards dopamine detection. This study has proved that the siloxene material could replace the other 2D materials, which include graphene, MXene, etc., for future electrochemical dopamine sensors with better analyzing performance.