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conferenceseries
.com
Volume 5, Issue 6 (Suppl)
J Mat. Sci.
ISSN: 2321-6212
Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13
TH
INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
E-BABE- Ultrafast and efficient transport of hot plasmonic electrons by graphene for Pt Free, highly
efficient visible-light responsive photocatalyst
Dong-Kwon Lim
Korea University KU-KIST Gradaute School of Converging Science and Technology Seoul, Republic of Korea
W
e recently report that reduced graphene-coated gold nanoparticles (r-GO-AuNPs) are excellent visible-light-responsive
photocatalysts for the photoconversion of CO
2
into formic acid (HCOOH). The wavelength-dependent quantum and
chemical yields of HCOOH shows a significant contribution of plasmon-induced hot electrons for CO
2
photoconversion.
Furthermore, the presence and reduced state of the graphene layers are critical parameters for the efficient CO
2
photoconversion
because of the electron mobility of graphene. With an excellent selectivity toward HCOOH (>90%), the quantum yield of
HCOOH using r-GO-AuNPs is 1.52%, superior to that of Pt-coated AuNPs (quantum yield: 1.14%). This indicates that r-GO
is a viable alternative to platinum metal. The excellent colloidal stability and photocatalytic stability of r-GO-AuNPs enables
CO
2
photoconversion under more desirable reaction conditions. These results highlight the role of reduced graphene layers
as highly efficient electron acceptors and transporters to facilitate the use of hot electrons for plasmonic photocatalysts. The
femtosecond transient spectroscopic analysis also shows 8.7 times higher transport efficiency of hot plasmonic electrons in
r-GOAuNPs compared with AuNPs.
Biography
Dong-Kwon Lim is an assistant professor at KU-KIST Graduate School of Science and Technology in Korea University (Seoul, South Korea) (2015 ~ current). After
he finished his BS and MS degree of Chemistry from Kyungpook National University (1996), he worked for more than 10 years in the pharmaceutical research
institutes of the company in Korea. After he received his Ph. D. degree of Chemistry from Seoul National University in 2011, he started his postdoctoral research
at MIT (David H Koch Institutes, Advisior: Prof. Robert Langer Lab) and Harvard Medical School (Children’s Hospital Boston) (2011~2013). Dr. Lim has made
pioneering contributions to the field of DNA-based nanostructure synthesis for single molecule surface-enhanced Raman scattering (SERS) and the developments
of new bio detection & therapeutic strategies based on organic/inorganic hybrid nanomaterials.
dklim@korea.ac.krDong-Kwon Lim, J Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-009