Water Soluble Fluorescent Graphene Nanodots

Shikha Singh, Kheyanath Mitra, Sudipta Senapati, Rajshree Singh, Yajnaseni Biswas, Susanta K. Sen Gupta, Nira Misra, Tarun K. Mandal, Pralay Maiti, Biswajit Ray

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Water soluble fluorescent graphene nanodots (GND) have been successfully prepared through a bottom up approach from brominated pyrene via alkaline hydrothermal condensation. FT-IR, UV-Vis, Raman, XRD, AFM, and TEM studies have shown the formation of −OH group rich nanodots having graphene features with an approximate size of 90 nm. Steady state and 3D fluorescence studies have shown efficient fluorescence emission with maximum at 540 nm upon excitation at 450 nm in pH≤7. Plasmid deoxyribonucleic acid (plasmid DNA) and bovine serum albumin (BSA) have shown their interaction with GND, which was studied via fluorescence quenching of GND and BSA, respectively. Selective quenching of the Förster resonance energy transfer (FRET) of BSA-GND conjugate via ascorbic acid (AA) has been used to construct a calibration curve for AA estimation with a linear range and limit of detection of 34.00–112.00 μmole/L and 31.343 μmole/L, respectively. GND has also shown concentration-dependent turn offchemosensing towards heavy metals like Pb2+, Cu2+, Hg2+ and Zn2+. In-vitromulticolor fluorescence imaging has been observed in GND-labelled HeLa (human cervical cancer) and NIH-3T3 (mouse embryonic fibroblast) cell lines with better uptake by HeLa cells. GND also has shown very high viability for both the cell lines up to the tested concentration of 300 μg/mL.

Original languageEnglish (US)
Pages (from-to)1177-1188
Number of pages12
Issue number11
StatePublished - Nov 2018
Externally publishedYes


  • Förster resonance energy transfer
  • bovine serum albumin
  • brominated pyrene
  • fluorescence
  • graphene nanodots

ASJC Scopus subject areas

  • Biomaterials
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Materials Chemistry


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