Jia Hongliang, Zhao Jianwei, Qin Lirong, Zhao Min, Liu Gang
School of Physical Science and Technology, Southwest University Chongqing 400715 P. R. China
RSC Adv. 2019 Aug 28;9(46):26843-26849. doi: 10.1039/c9ra03850g. eCollection 2019 Aug 23.
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.
当前的工作描述了使用钢质针灸针作为电极基底，以构建用于高灵敏度检测抗坏血酸的NiMnO纳米片层修饰微针传感器。为了构建功能化针灸针，首先在针表面沉积一层碳膜作为种子层。随后，采用简单的水热反应-煅烧工艺在针上生长NiMnO纳米片，作为传感界面。电化学研究表明，NiMnO纳米片修饰的针灸针电极在抗坏血酸的安培检测中表现出优异的效率。此外，该电极表现出3106 μA mM cm的高灵敏度、0.1 μM的检测限以及1.0 μM至2.0 mM的宽线性范围。结果表明，NiMnO纳米片修饰的针灸针构成了一个潜在的新型非酶抗坏血酸传感器构建平台。
