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Efficient Photocatalysis of Composite Films Based on Plasmon-Enhanced Triplet–Triplet Annihilation

Jiaojiao Fang, Cihui Zhou, Yukai Chen, Liang Fang, Wei Wang, Cheng Zhu, Yaru Ni, Chunhua Lu
ACS applied materials & interfaces 2019 v.12 no.1 pp. 717-726
cadmium sulfide, composite films, composite materials, graphene, green light, irradiation, nanogold, nanoparticles, photocatalysis, photocatalysts, photons, platinum, pollution, polydimethylsiloxane, tetracycline
To avoid secondary environmental pollution caused by photocatalysts in their applications, our work offers a new strategy for fabricating photocatalytic films based on plasmon-enhanced triplet–triplet annihilation upconversion (TTA-UC). Polydimethylsiloxane (PDMS) films containing platinum (II)-octaethylporphyrin and 9,10-diphenylanthracene (PtDPAP), and gold nanoparticles (AuNPs) were prepared. While graphene (G) was used as an adhesive and conductive layer, CdS nanoparticles were deposited onto the films (AuNPs-PtDPAP/G/CdS) by plasma glow discharge pretreatment. The AuNPs-PtDPAP film had an enhancement in the green-to-blue upconversion compared with the pristine PtDPAP film. CdS can utilize the AuNPs plasmon-enhanced TTA-UC photons to realize efficient photocatalytic reactions. The pseudo-first-order rate constant (kₚfₒ) of the optimized active and stable photocatalytic film, 0.3 AuNPs-PtDPAP/G/CdS, reached 0.294 h–¹ for tetracycline degradation under green light irradiation. Its kₚfₒ in decomposing tetracycline under visible light is 2.62 times higher than that of the PtDPAP/G/CdS. The reported composite films provide a strategy to improve the photocatalytic activity and promote the practical applications of nanosize photocatalysts.