Donor-Acceptor Type Black Phosphorus Nanosheets Covalently Functionalized with Conjugated Polymer for Laser Protection
POLYMER CHEMISTRY(2019)
摘要
Covalent functionalization of two-dimensional black phosphorus (BP) with conjugated polymers would be favorable to improve its environmental stability and solubility in organic solvents, and thereby to open a way to explore more applications of BP in the fields of optoelectronics, electronics and photonics. As a proof-of-concept application, soluble donor-acceptor type BP nanosheets covalently functionalized with poly[(1,4-diethynyl-2,5-bis(hexyl-oxy)benzene)-alt-benzo[c]thiadiazole] (hereafter called PDBT-BP) were synthesized through Sonogashira-Hagihara coupling polymerization, and embedded into an optically nonactive transparent poly(methylmethacrylate) (PMMA) matrix to produce the PMMA-based PDBT-BP film for nonlinear optics. In contrast to BP/PMMA, PDBT-BP/PMMA and PDBT/BP blends/PMMA films, the annealed PDBT-BP/PMMA film, which was heated at 150 degrees C under dry argon for 1 h, shows more excellent reverse saturable absorption (RSA) behavior, with a larger nonlinear absorption coefficient (beta (eff)) of 208.16 cm GW(-1) and an imaginary third-order susceptibility (Im chi ((3))) of 8.89 x 10(-11) esu at a pulse energy of 400 mu J. The achieved optical limiting (OL) threshold is 4.44 J cm(-2) (0.74 GW cm(-2)), smaller than that of the non-annealed PDBT-BP/PMMA film (5.64 J cm(-2)). The SA (saturable absorption) to RSA transition observed at a low incident laser intensity could be used to realize all-optical intensity-dependent logic gates in the near future.
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