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CVD Assisted Hydrophobic Graphene Quantum Dots: Fluorescence Sensor for Aromatic Amino Acids
Author(s) -
Deka Manash Jyoti,
Chowdhury Devasish
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601737
Subject(s) - graphene , fluorescence , quantum dot , nanotechnology , aromatic amino acids , chemistry , photochemistry , amino acid , materials science , biochemistry , physics , quantum mechanics
In this paper, an hydrophobic graphene quantum dots(h‐GQDs) based PL sensor was demonstrated which can distinguish between aromatic and non‐aromatic amino acids. The h‐GQDSs prepared using Chemical Vapour Deposition method from acetylene gas and hydrogen gas was used as cocatalyst. The characterization of h‐GQDs was carried out by UV‐Visible absorption spectrophotometer, Dynamic Light Scattering, Scanning Electron Microscopy, Fourier Transform Infrared Spectrophotometer, Raman spectroscopy. These CVD assisted h‐GQDs form stable dispersion in organic solvents and are hydrophobic in nature. It was observed that photoluminescence (PL) intensity of h‐GQDs systems in the presence of aromatic amino acids is enhanced due to electron transfer from aromatic amino acids to h‐GQDs whereas with non‐aromatic amino acids PL intensity is quenched. Hence h‐GQDs systems can selectively distinguish between aromatic and non‐aromatic amino acid. The mechanistic insight is also discussed in the paper. Besides fluorescence sensors for aromatic amino acids, the h‐GQDs system can also be used as a fluorescence hydrophobic coating material as when coated on glass substrate it shows very high contact angle (107°).