Electrodeposited Alginate‐Based Green Synthesis of CuS Nanoparticles and Nanocomposite Films for Electrochemical and Colorimetric Detection

Abstract CuS nanoparticles (NPs) and CuS NPs/alginate nanocomposite films are prepared using a novel method based on the coordinated electrodeposition of alginate. This method exquisitely utilizes the coordination of alginate with Cu 2+ ions to carry out the electrodeposition, and alginate as the stabilizer for CuS NPs and the major ingredient in the nanocomposite film. Thus, the method has many advantages such as facile operation, green route, mild conditions, and convenient post‐treatment. After the electrodeposition, a smooth and homogeneous film has been electrodeposited on the anodic electrode. Transmission electron microscopy observation reveals that there are nanoparticles (the average size of 6.0 nm) in the electrodeposited film. The results from spectral analysis further confirm the existence of CuS NPs. The CuS NPs/alginate nanocomposite film modified electrode can be directly constructed by taking advantage of the electrodeposition, which shows the electrochemical detection capability towards H 2 O 2 and hydroquinone. The CuS NPs/alginate nanocomposite film also possesses the colorimetric detection capability toward H 2 O 2 and dopamine. Therefore, this study offers a green and convenient method for fabricating CuS NPs and nanocomposite films, which is promising for applications in functional nanocomposites and detection fields.