Journal article
Graphene quantum dots from graphite by liquid exfoliation showing excitation-independent emission, fluorescence upconversion and delayed fluorescence
Physical chemistry chemical physics : PCCP, v 18(31), pp 21278-21287
2016
PMID: 27302411
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Facile synthesis of 2-10 nm-sized graphene quantum dots (GQDs) from graphite powder by organic solvent-assisted liquid exfoliation using a sonochemical method is reported in this study. Synthesized GQDs are well dispersed in organic solvents like ethyl acetoacetate (EAA), dimethyl formamide (DMF) and also in water. MALDI-TOF mass spectrometry reveals its selective mass fragmentation. Detailed characterizations by various techniques like X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and high resolution transmission electron microscopy (HRTEM) confirm the formation of disordered, functional GQDs. Density functional theory (DFT) calculation confirms HOMO-LUMO energy gap variation with changing size and functionalities. Photoluminescence (PL) properties of as-prepared GQDs were studied in detail. The ensemble studies of GQDs showed excellent photoluminescence properties comprising normal and upconverted fluorescence, delayed fluorescence and room-temperature phosphorescence. PL decay dynamics of GQDs has been explored using time-correlated single-photon technique (TCSPC) as well as femtosecond fluorescence upconversion technique. In vitro cytotoxicity study reveals its biocompatibility and high cell viability (>91%) even at high concentration (400 mu g mL(-1)) of GQDs in Chinese Hamster Ovary (CHO) cells.
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Details
- Title
- Graphene quantum dots from graphite by liquid exfoliation showing excitation-independent emission, fluorescence upconversion and delayed fluorescence
- Creators
- Suprabhat Sarkar - Indian Institute of Chemical TechnologyDayakar Gandla - Indian Institute of Chemical TechnologyYeduru Venkatesh - Academy of Scientific and Innovative ResearchPrakriti Ranjan Bangal - Academy of Scientific and Innovative ResearchSutapa Ghosh - Indian Institute of Chemical TechnologyYang Yang - Drexel University, ChemistrySunil Misra - Indian Institute of Chemical Technology
- Publication Details
- Physical chemistry chemical physics : PCCP, v 18(31), pp 21278-21287
- Publisher
- Royal Soc Chemistry
- Number of pages
- 10
- Grant note
- GAP-0423 / CSIR, India; Council of Scientific & Industrial Research (CSIR) - India MULTIFUN (CSIR, India) GAP-0423 / DST, India; Department of Science & Technology (India) AcSIR, New Delhi CSIR, New Delhi; Council of Scientific & Industrial Research (CSIR) - India
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000381418000037
- Scopus ID
- 2-s2.0-84981225408
- Other Identifier
- 991021874714904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Physics, Atomic, Molecular & Chemical