Photocatalytic And Electrochemical Sensing Properties Of Composite System Based On Perylene Imide Derivatives

The perylene diimide derivatives are important n-type semiconductors.They not only have a stable?-conjugated system,but also possess large band gap and a wide light absorption range,which lead to great application value in photoelectrochemical detection.At the same time,due to the designability of its molecular structure,the photoelectric performance of the perylene diimide derivatives is improved by connecting with other semiconductors.In this paper,two kinds of perylene imide derivatives/graphite carbon nitride?g-C₃N₄?composites were designed and synthesized to improve the photocatalytic performance,a kind of perylene imide derivative/silver?Ag?composite was used for electrochemical detection.Covalent-bond-link benzo[ghi]perylenetriimide/graphitic carbon nitride?BPTI/g-C₃N₄?was synthesized by N-amidation reaction of benzo[ghi]perylene diimide tris-anhydride?BPDI?and graphitic carbon nitride?g-C₃N₄?.BPTI/g-C₃N₄ composite possessed more compact p-n heterojunction with high electron-hole separation rate and loose structure because of the alkyl chains and unilateral active groups of BPDI.Specific area of BPTI/g-C₃N₄ reached to 20.4 m²/g.The photocatalytic experiments on the degradation of rhodamine B?RhB?indicated that the photocatalytic activity of BPTI/g-C₃N₄ performed 3 times as well as that of pure g-C₃N₄.To form stable graphitic carbon nitride?g-C₃N₄?composite photocatalyst with high Photocatalytic activity,the hydrogen bonding composite was facilely built by two perylene anhydride derivatives?3,4,9,10-perylenetetracarboxylic acid anhydride?PTCDA?and1,6,7,12-tetrachloroperylene-3,4,9,10-tetracarboxylic acid?TClPTCDA??with g-C₃N₄.The photocatalytic activity of composite photocatalysts was significantly improved.Furthermore,the TClPTCDA/g-C₃N₄?TClP-g?prossessed higher photocatalytic activity than that of PTCDA/g-C₃N₄?P-g?under same experimental condition.Because the larger gap between the LUMO of TClPTCDA and the conduct band of g-C₃N₄ result in more effective photoelectron transmission than that of P-g under visible light irradiation.Further expanding the application of phthalimide derivatives in photodetection,a novel semiconducting macromolecule-polyperylene tetraamide?PPTI?was first synthesized using 3,4,9,10-perylene tetracarboxylic acid?PTCA?and hydrazine hydrate?N₂H₄?.The Ag nanoparticles were embedded into PPTI film to obtain a highly sensitive hydrazine sensor-Ag NPs/PPTI.According to cyclic voltammetry results,Ag NPs/PPTI/GCE indicated good electrocatalytic activity toward the oxidation of hydrazine.The amperometric detection of hydrazine was then applied on Ag NPs/PPTI/GCE.It exhibited a wide linear range from 0.05 to 50?M,a low detection limit?S/N=3?of 0.05?M and high sensitivity of 0.45?A/??M·cm²?.In addition,the sensor showed high selectivity and stability.It will be a potential application for developing efficient chemical sensors for environmental pollutants.