Novel Graphene/InO Nanocubes Preparation and Selective Electrochemical Detection for L-Lysine of Chi.

In this work, novel graphene/InO (GR/InO) nanocubes were prepared via one-pot solvothermal treatment, reduction reaction, and successive annealing technology at 600 °C step by step. Interestingly, InO with featured cubic morphology was observed to grow on multi-layered graphene nanosheets, forming novel GR/InO nanocubes. The resulting nanocomposites were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), etc. Further investigations demonstrated that a selective electrochemical sensor based on the prepared GR/InO nanocubes can be achieved. By using the prepared GR/InO-based electrochemical sensor, the enantioselective and chem-selective performance, as well as the optimal conditions for L-Lysine detection in Chi, were evaluated. The experimental results revealed that the GR/InO nanocube-based electrochemical sensor showed good chiral recognition features for L-lysine in Chi with a linear range of 0.23-30 μmol·L, together with selectivity and anti-interference properties for other different amino acids in Chi.