Insightful information regarding the interaction between amino acids and colloidal nitrogen functionalized graphene quantum dots (N-GQDs) can be studied by analysing the excited state dynamics of N-GQD-amino acid complex. N-GQDs, synthesized by a microwave mediated hydrothermal process using citric acid and urea as carbon and nitrogen sources respectively, showed an excitation dependent emission. This was used to monitor the photo-induced electron transfer (PET) between the quantum dots and amino acids. Representative neutral, basic and acidic amino acids (serine,arginine and aspartic acid) were used in the present study. UV visible absorption, steady state and time-resolved luminescence techniques were used to understand the interactions between the amino acids and N-GQDs. Nano-second laser flash photolysis set-up was used for the detection of photo-excited radicals. The present study provides opportunities for using luminescent N-GQDs as probes for the detection of bio-molecules. The details of the experiments will be presented in the talk.

Photo-induced electron transfer from amino acids to nitrogen functionalized graphene quantum dots

255th National Meeting (2018)

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