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Research Article

Cascading electron transfer and photophysics in a donor-π-acceptor graphene nanoconjugate

Lulu Fu1, Hui Li1, Yan Fang1, Zihao Guan1, Zhiyuan Wei1, Naying Shan1, Fang Liu1, Yang Zhao1, Mingfei Zhang1, Zhipeng Huang1, Mark G. Humphrey2, Chi Zhang1( )
China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
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Abstract

Electron-donating porphyrins (Por), electron-accepting phthalocyanines (Pcs), and reduced graphene oxide (RGO) were integrated into a multicomponent nanoconjugate (Por-RGO-Pc). The donor-π-acceptor nanoconjugate Por-RGO-Pc was characterized using Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), and ultraviolet–visible (UV–Vis) spectroscopy. Photoinduced cascading electron/charge transfer from Por to RGO and from RGO to Pc was established from fluorescence, electrochemical, and femtosecond transient absorption (fs-TA) spectroscopy studies. The increased distance between the electron donors and acceptors of the Por-RGO-Pc nanoconjugate compared to the parent materials and the intermediate RGO-Pc results in long-lived charge separation, and an enhancement in nonlinear optical (NLO) absorption (a large NLO coefficient of about 827.44 cm/GW) towards nanosecond laser irradiation at 532 nm.

Graphical Abstract

Introduction of electron-donating porphyrin and hexakis(hexylsulfonyl) substituted electronwithdrawing phthalocyanine to reduced graphene oxide for constructing a trinary donor-π-acceptor (D-π-A) system, porphyrin-reduced graphene oxide-phthalocyanine (Por-RGO-Pc), with cascading intrasystem electron/charge transfer as well as a dramatically enhanced nonlinear optical performance towards nanosecond laser irradiation.

Keywords

graphenenanoconjugatedonor-π-acceptor (D-π-A)cascading charge separationnonlinear optics

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Nano Research
Volume 16 Issue 4,
April 2023
Pages 5909-5918
DOI: 10.1007/s12274-022-5167-8

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Cite this article:
Fu L, Li H, Fang Y, et al. Cascading electron transfer and photophysics in a donor-π-acceptor graphene nanoconjugate. Nano Research, 2023, 16(4): 5909-5918. https://doi.org/10.1007/s12274-022-5167-8
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Received: 03 September 2022
Revised: 29 September 2022
Accepted: 03 October 2022
Published: 04 November 2022
© Tsinghua University Press 2022