The fabrication of an NiMnO nanoflake-modified acupuncture needle electrode for highly sensitive ascorbic acid detection.

The current work describes the use of a steel acupuncture needle as an electrode substrate in order to construct an NiMnO nanoflake layer-modified microneedle sensor for highly sensitive ascorbic acid detection. For the purpose of constructing the functionalized acupuncture needle, first, a carbon film was layered on the needle surface as the seed layer. Subsequently, a straightforward hydrothermal reaction-calcination process was employed for the growth of NiMnO nanoflakes on the needle to function as a sensing interface. Electrochemical investigations illustrated the fact that the NiMnO nanoflake-altered acupuncture needle electrode manifested outstanding efficiency toward the amperometric identification of ascorbic acid. In addition, the electrode manifested elevated sensitivity of 3106 μA mM cm, detection limit of 0.1 μM, and a broad linear range between 1.0 μM and 2.0 mM. As demonstrated by the results, the NiMnO nanoflake-modified acupuncture needle constitutes a potentially fresh platform to construct non-enzymatic ascorbic acid sensors.