1 research outputs found
Size and Dopant Dependent Single Particle Fluorescence Properties of Graphene Quantum Dots
The emissive properties of both doped
and nondoped graphene quantum
dots (GQDs) with sizes ranging from 3 to 11 nm were analyzed at the
single particle level. Both doped and nondoped GQDs are a composite
of particles exhibiting green, red, or NIR fluorescence on excitation
at 488, 561, and 640 nm, respectively. Nitrogen-doped GQDs (N-GQDs)
with diameters ranging from 3.4 to 5.2 nm show a larger proportion
of particles with NIR emission as compared to nondoped particles.
Doping of GQDs also resulted in changes in the photostability and
the fluorescence intermittency seen in single GQD particles. While
milliseconds to seconds time scale blinking was regularly observed
for red-emitting nondoped GQDs, nitrogen doping significantly reduced
blinking. Both doped and nondoped particles also exhibit moderate
size dependent photophysical properties