Preparation And Detection Performance Investigation Of Luminescence System Based On G-C₃N₄

Graphite carbon nitride（g-C₃N₄）is widely used in the field of optical sensing due to its unique optical properties and chemical stability.However,g-C₃N₄ electrons and holes are easy to recombine,and the electron transfer efficiency is not high,which limits its application in CL sensing and ECL sensing.Based on this,g-C₃N₄ was prepared by pyrolysis,and its surface was modified by metal loading method.New CL sensors and ECL sensors were constructed and their detection performance was analyzed.The specific research contents are as follows:g-C₃N₄ was prepared with dicyandiamide as raw material,and Au/g-C₃N₄ with gold（Au）content of 0.1%,0.5%,and 1.0%were prepared.The results show that the prepared g-C₃N₄ has a typical lamellar structure with a size of 2 to 4μm.Gold nanoparticles（Au NPs）are uniformly distributed on the surface of Au/g-C₃N₄,with a size between 3～8 nm.The Ce（Ⅳ）-Na₂SO₃-g-C₃N₄ CL system was constructed based on the successful preparation of g-C₃N₄ and Au/g-C₃N₄.The results show that 0.1%Au/g-C₃N₄ can increase the CL intensity of Ce（Ⅳ）-Na₂SO₃ system by 250 times.The system was used to quantitatively detect reduced glutathione（G-SH）.The study finds that the detection range is0.026～217μmol/L,and the detection limit is 5.5 nmol/L.The K₂S₂O₈-g-C₃N₄ ECL system was constructed,and the system was used to quantitatively detect Co²⁺.The results show that 0.5%Au/g-C₃N₄ can increase the ECL signal by 8 times compared with g-C₃N₄.Using Co²⁺as the detected substance,the detection performance of K₂S₂O₈-0.5%Au/g-C₃N₄ ECL system was studied,and it is found that the system shows high sensitivity and high selectivity to Co²⁺,with a linear detection range of0.01～35μmol/L,the detection limit is 1.0 nmol/L.In summary,by loading Au NPs on the surface of g-C₃N₄,the catalytic performance and electrochemical performance of g-C₃N₄ can be improved,and a more efficient CL system and ECL system can be constructed.It has high research and application value in the field of biomolecules and ion sensors.Figure 31;Table 9;Reference 114...