Construction of Carbon Nitride Nanorod Clusters and Their Sensing Properties for Ascorbic Acid
YING Zhiye1, QIAO Yuting2, LIU Bingxin1,*, QIAO Lijuan3,*
1 School of Mechanical Engineering, Qinghai University, Xining 810016, China 2 School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 3 School of Basic Medical Sciences, Qinghai University, Xining 810016, China
Abstract: Ascorbic acid (AA) is involved in various metabolisms in the body, wound healing, and fighting against many diseases, and the detection of AA in the human body is important for the diagnosis of human health. In this work, melamine was used as raw material, and a nitrogen-source was added by the hydrothermal method and calcined at high temperature to prepare carbon nitrode nanorod clusters (g-C3N4 nanorod clusters, gCN NRCs), which were used as sensing materials to achieve efficient electrocatalytic oxidation for the detection of AA. The morphology, crystal structure and chemical composition of gCN NRCs were completely revealed by scanning electron microscopy, X-ray diffractometer and Fourier infrared spectroscopy. gCN NRCs showed the highest AA sensing response in PBS buffer solution with pH=6.0, 1.6 mmol/L AA,an enrichment time of 180 s and a modification volume of 6 μL. The detection range of AA was 0.2—1.6 μmol/L, the active area was 0.889 cm2, and the detection limit was 4.43 μmol/L. By exploring the response curves of AA at different scan rates, it is indicated that the catalytic process is a diffusion process. The relative standard deviation (RSD) values of the electrochemical sensor’s cyclic and long-term stability, repeatability, and reproducibility are 6.47%, 1.36%, 2.15%, and 4.43% respectively, and it also possesses excellent anti-interference ability, indicating that gCN NRCs have great potential as a promising material for the diagnosis of AA-related diseases.
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