title: Covalent Modification of MoS2 with Poly(N-vinylcarbazole) for Solid-State Broadband Optical Limiters.
abstract: New soluble MoS2 nanosheets covalently functionalized with poly(N-vinylcarbazole) (MoS2-PVK) were in situ synthesized for the first time. In contrast to MoS2 and MoS2 /PVK blends, both the solution of MoS2 -PVK in DMF and MoS2-PVK/poly(methyl methacrylate) (PMMA) film show superior nonlinear optical and optical limiting responses. The MoS2-PVK/PMMA film shows the largest nonlinear coefficients (βeff) of about 917 cm GW(-1) at λ=532 nm (cf. 100.69 cm GW(-1) for MoS2/PMMA and 125.12 cm GW(-1) for MoS2/PVK/PMMA) and about 461 cm GW(-1) at λ=1064 nm (cf. -48.92 cm GW(-1) for MoS2/PMMA and 147.56 cm GW(-1) for MoS2/PVK/PMMA). A larger optical limiting effect, with thresholds of about 0.3 GW cm(-2) at λ=532 nm and about 0.5 GW cm(-2) at λ=1064 nm, was also achieved from the MoS2-PVK/PMMA film. These values are among the highest reported for MoS2-based nonlinear optical materials. These results show that covalent functionalization of MoS2 with polymers is an effective way to improve nonlinear optical responses for efficient optical limiting devices.
authors.affiliation: Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.
authors.forename: Hongxia
authors.initials: H
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, 201800, P.R. China.
authors.forename: Ningning
authors.initials: N
authors.lastname: Dong
authors.affiliation: Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.
authors.forename: Ting
authors.initials: T
authors.lastname: Bai
authors.affiliation: Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Song
authors.affiliation: Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, 201800, P.R. China. jwang@siom.ac.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.
authors.forename: Yuanhao
authors.initials: Y
authors.lastname: Qin
authors.affiliation: Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China. chentangyu@yahoo.com.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
mesh_terms: D002227:Carbazoles / Q000737:chemistry*; D015394:Molecular Structure; D008982:Molybdenum / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000138:chemical synthesis* / Q000737:chemistry*; D011145:Polyvinyls; D014753:Vinyl Compounds / Q000737:chemistry*
chemical_list: D002227:Carbazoles; D009942:Organometallic Compounds; D011108:Polymers; D011145:Polyvinyls; D014753:Vinyl Compounds; C035125:poly-N-vinylcarbazole; D008982:Molybdenum; D019904:Polymethyl Methacrylate
keywords: molybdenum; nanostructures; nonlinear optics; polymers; sulfur