Porphyrin Chemically Modified MoS2 Quantum Dots for Solid-State Broadband Optical Limiters
MoS2 quantum dots (MQDs) with unique electronic and optical properties are promising broadband nonlinear optical (NLO) material for ultrafast optical applications. It would be very interesting and challenging to functionalize MQDs with another hotspot optoelectronically active molecules “porphyrin”. Herein, by treating MQDs with tetraphenylporphyrin (TPP) diazonium salts, we synthesized a novel nanohybrid material, MQDs-TPP, in which TPP was covalently functionalized to the surface of MQDs via C-S linkage. To explore its solid-state broadband NLO application, the MQDs-TPP nanohybrid was encapsulated into a poly(methyl methacrylate) (PMMA) matrix for the open-aperture Z-scan measurements at 532 and 1064 nm. In contrast to MQDs/PMMA and TPP/PMMA, the MQDs-TPP/PMMA film exhibits superior nonlinear optical and optical limiting responses, with the largest nonlinear coefficients (βeff) and lowest optical limiting (OL) thresholds about 1059.17 cm GW-1 and 1.62 J cm-2 at 532 nm, and 831.13 cm GW-1 and 1.97 J cm-2 at 1064 nm.
- This article is part of the themed collection: 2019 Nanoscale HOT Article Collection