Solvent Effect on Supramolecular Self-Assembly of Chlorophylls a on Chemically Reduced Graphene Oxide

Tejaswini R. B. Ramakrishna, Motilal Mathesh, Zhen Liu, Chunmei Zhang, Aijun Du, Jingquan Liu, Colin J. Barrow, Min Chen, Mark J. Biggs, Wenrong Yang

Research output: Contribution to journalArticlepeer-review

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Abstract

Solvent plays an important role in the surface interaction of molecules. In this study, we use "chlorophyll a", an archetypical molecule, to investigate its supramolecular self-assembly with chemically reduced graphene oxide in three different types of solvents: polar protic, polar aprotic, and non-polar. It was observed that only a polar protic solvent that can donate protons facilitates the hydrogen bonding between chlorophyll a and chemically reduced graphene oxide nanosheets in a hybrid system. The formation of hydrogen bonds further initiates the other non-covalent interactions such as π-π stacking and hydrophobic interaction, which altogether play a key driving force for supramolecular self-assembly of chlorophylls on chemically reduced graphene oxides. The experimental results are strongly supported by density functional theory calculations, which show robust electron coupling between chlorophylls and chemically reduced graphene oxide.

Original languageEnglish
Pages (from-to)13575–13582
Number of pages8
JournalLangmuir
Volume36
Issue number45
Early online date21 Oct 2020
DOIs
Publication statusPublished - 17 Nov 2020

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