Dramatic femtosecond nonlinear absorption at a strongly coupled porphyrin-graphene nanoconjugate  

作　　者：Lulu Fu Yan Fang Zihao Guan Zhiyuan Wei Rui Yang Naying Shan Fang Liu Yang Zhao Mingfei Zhang Zhipeng Huang Mark GHumphrey Chi Zhang 

机构地区：[1]China-Australia Joint Research Center for Functional Molecular Materials,School of Chemical Science and Engineering,Tongji University,Shanghai 200092,China [2]United World College,Changshu 215500,China [3]Research School of Chemistry,Australian National University,Canberra,ACT 2601,Australia

出　　处：《Nano Research》2023年第4期5900-5908,共9页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(No.51432006);the Ministry of Science and Technology of China for the International Science Linkages Program(No.2011DFG52970);the Ministry of Education of China for the Changjiang Innovation Research Team(No.IRT14R23);the Ministry of Education and the State Administration of Foreign Experts Affairs for the 111 Project(No.B13025);the Innovation Program of Shanghai Municipal Education Commission are gratefully acknowledged.M.G.H thanks the Australian Research Council(No.DP170100411)for support.

摘　　要：Edge-functionalization of graphene is emerging as a powerful chemical method for the construction ofπ-delocalized highlyplanar graphene nanoconjugates that are not accessible through surface-supported syntheses.Herein,a graphene-porphyrin nanoconjugate via a robust pyrazine(pz)linkage has been obtained by condensing 2,3-diamino-5,10,15,20-tetraphenylporphyrin(DA-TPP)with ortho-quinone(o-quinone)moieties at edge sites of graphene oxide(GO).The as-prepared GO-pz-TPP exhibits an intense absorption extending from 375 to 900 nm and a high quenching yield(98%)of fluorescence,indicating a strong electronic coupling effect between GO and TPP units.GO-pz-TPP displays strong nonlinear optical(NLO)absorption and giant NLO coefficients with 800 and 1,030 nm fs laser,in sharp contrast to traditional graphene-porphyrin nanohybrids only NLO-active towards ns laser.Such a dramatic NLO performance towards femtosecond pulsed laser has not been achieved in any carbonchromophores nanohybridized materials to date.This work validates theπ-extended edge-functionalization strategy as a means to tune the NLO properties of graphene,thereby providing a new paradigm for the assembly of versatile optoelectronic materials.

关 键 词：graphene oxide PORPHYRIN nanoconjugate FEMTOSECOND nonlinear optics 

分 类 号：O62[理学—有机化学]