Detail publikace

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

GOMEZ PEREZ, I. SULLEIRO, M. DOLEČKOVÁ, A. PIZÚROVÁ, N. MEDALOVÁ, J. ROY, R. NEČAS, D. ZAJÍČKOVÁ, L.

Originální název

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Graphene quantum dots (GQDs) with tunable fluorescence emission promise excellent bioapplication potential, especially in bioimaging. We report the synthesis of nitrogen-doped GQDs (N-GQDs) from glucose and ethylenediamine, cheap and safe chemicals, using a one-step and fast microwave-assisted hydrothermal method. Our N-GQDs exhibit fluorescence in the entire visible spectral region, which extends to near-ultraviolet and slightly to near-infrared. Since the origin of fluorescence and its relation to the structure and synthesis conditions are not yet fully understood, we also concentrated on the fluorescence mechanism explanation. Structural characterization with steady-state and time-resolved photoluminescence measurements indicated that band-to-band transitions, size effect, and different nitrogen and oxygen functional groups play a role in this multicolor emission. Remarkably, we found for the first time the evidence that directly relates a change in the N-GQD work function to the change in oxygen groups under UV irradiation via ultraviolet photoelectron spectroscopy. Thus, we confirmed that for lambda(ex) less than or similar to 380 nm, photooxidation processes occurred, which led to chemical modification, thereby lowering the work function in the N-GQDs. The N-GQDs were proved to be highly biocompatible by a cell viability assay using vascular smooth muscle cells. Together with the wide spectral range emission observed in confocal fluorescence imaging, it demonstrated the potential of the N-GQDs for in vitro bioimaging applications.

Klíčová slova

CARBON NANODOTS; FACILE SYNTHESIS; OPTICAL-PROPERTIES; SURFACE-STATE; PHOTOLUMINESCENCE; REDUCTION; OXIDE; BLUE; LUMINESCENCE; MECHANISM

Autoři

GOMEZ PEREZ, I.; SULLEIRO, M.; DOLEČKOVÁ, A.; PIZÚROVÁ, N.; MEDALOVÁ, J.; ROY, R.; NEČAS, D.; ZAJÍČKOVÁ, L.

Vydáno

30. 9. 2021

Nakladatel

AMER CHEMICAL SOC

Místo

WASHINGTON

ISSN

1932-7455

Periodikum

Journal of Physical Chemistry C (web)

Ročník

125

Číslo

38

Stát

Spojené státy americké

Strany od

21044

Strany do

21054

Strany počet

11

URL

https://pubs.acs.org/doi/10.1021/acs.jpcc.1c06029

BibTex

@article{BUT175546,
  author="Inmaculada Jennifer {Gomez Perez} and Manuel Vázquez {Sulleiro} and Anna {Dolečková} and Naděžda {Pizúrová} and Jiřina {Medalová} and Rajarshi {Roy} and David {Nečas} and Lenka {Zajíčková}",
  title="Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging",
  journal="Journal of Physical Chemistry C (web)",
  year="2021",
  volume="125",
  number="38",
  pages="21044--21054",
  doi="10.1021/acs.jpcc.1c06029",
  issn="1932-7455",
  url="https://pubs.acs.org/doi/10.1021/acs.jpcc.1c06029"
}