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2016 ; 6
(ä): 27145
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Energy transfer from an individual silica nanoparticle to graphene quantum dots
and resulting enhancement of photodetector responsivity
#MMPMID27250343
Kim S
; Shin DH
; Kim J
; Jang CW
; Kang SS
; Kim JM
; Kim JH
; Lee DH
; Kim JH
; Choi SH
; Hwang SW
Sci Rep
2016[Jun]; 6
(ä): 27145
PMID27250343
show ga
Förster resonance energy transfer (FRET), referred to as the transfer of the
photon energy absorbed in donor to acceptor, has received much attention as an
important physical phenomenon for its potential applications in optoelectronic
devices as well as for the understanding of some biological systems. If
one-atom-thick graphene is used for donor or acceptor, it can minimize the
separation between donor and acceptor, thereby maximizing the FRET efficiency
(EFRET). Here, we report first fabrication of a FRET system composed of silica
nanoparticles (SNPs) and graphene quantum dots (GQDs) as donors and acceptors,
respectively. The FRET from SNPs to GQDs with an EFRET of ?78% is demonstrated
from excitation-dependent photoluminescence spectra and decay curves. The
photodetector (PD) responsivity (R) of the FRET system at 532?nm is enhanced by
10(0)?10(1)/10(2)?10(3) times under forward/reverse biases, respectively,
compared to the PD containing solely GQDs. This remarkable enhancement is
understood by network-like current paths formed by the GQDs on the SNPs and easy
transfer of the carriers generated from the SNPs into the GQDs due to their close
attachment. The R is 2?3 times further enhanced at 325?nm by the FRET effect.