Highly efficient electrochemical detection of 4-nitrophenol based on electrode-modified CuInS₂@UiO-66 nanocomposite

Owing to its extraordinary electrochemical properties, the CIS@UiO-66 nanocomposite has proved to be one of the most potential materials for modifying electrode surfaces toward 4-NP detection. Herein, CIS nanomaterials are effectively combined onto UiO-66 material, aiming to achieve a unique heterostructure. In this configuration, CIS plays a role as an active material, while UiO-66 acts as an efficient framework with high specific surface area and pore volume, good chemical stability, and large electrical conductivity to uniformly decorate CIS. As expected, with such synergism of CIS and UiO-66, the electrochemical characteristics and detection performance of 4-NP are enhanced remarkably. Namely, electrochemical measurements exhibit kinetic parameters involving oxidation-reduction reactions of both the standard probe and targeted molecules (4-NP). The sensitivity, linear concentration range, LOD value, and selectivity toward the detection of the 4-NP at CIS@UiO-66/SPE are the highest compared to CIS/SPE and UiO-66/SPE, demonstrating the high applicability potential of this proposed electrode in the future.