@article{Fu2023, 
author = {Lulu Fu and Yan Fang and Zihao Guan and Zhiyuan Wei and Rui Yang and Naying Shan and Fang Liu and Yang Zhao and Mingfei Zhang and Zhipeng Huang and Mark G. Humphrey and Chi Zhang},
title = {Dramatic femtosecond nonlinear absorption at a strongly coupled porphyrin-graphene nanoconjugate},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {4},
pages = {5900-5908},
keywords = {graphene oxide, porphyrin, nanoconjugate, femtosecond, nonlinear optics},
url = {https://www.sciopen.com/article/10.1007/s12274-022-5155-z},
doi = {10.1007/s12274-022-5155-z},
abstract = {Edge-functionalization of graphene is emerging as a powerful chemical method for the construction of π-delocalized highly-planar 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 carbon-chromophores nanohybridized materials to date. This work validates the π-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.}
}