Ping-Pong Energy Transfer in Covalently Linked Porphyrin-MoS2 Architectures

Abstract

Molybdenum disulfide nanosheets covalently modified with porphyrin were prepared and fully characterized. Neither the porphyrin absorption nor its fluorescence was notably affected by covalent linkage to MoS₂ . The use of transient absorption spectroscopy showed that a complex ping-pong energy-transfer mechanism, namely from the porphyrin to MoS₂ and back to the porphyrin, operated. This study reveals the potential of transition-metal dichalcogenides in photosensitization processes.

Keywords: 1,2-dithiolane; MoS2; hybrid materials; porphyrins; sensitizers.