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Joint Conference
July 17-18, 2017 Chicago, USA
International Conference on
DIAMOND AND CARBON MATERIALS & GRAPHENE AND SEMICONDUCTORS
Volume 6, Issue 6 (Suppl)
J Material Sci Eng, an open access journal
ISSN: 2169-0022
Diamond and Carbon 2017 & Graphene 2017
July 17-18, 2017
J Material Sci Eng 2017, 6:6(Suppl)
DOI: 10.4172/2169-0022-C1-077
Superior functionality and luminescence of nanodiamonds for sensoric and diagnostic applications by
targeted high temperature gas-solid reactions and electron beam irradiation
Bernd Abel
University of Leipzig, Germany
N
anodiamonds have excellent mechanical and optical properties, high surface areas and tunable functional surfaces. They
are also non-toxic, which makes them well suited for biomedical applications. Here we highlight an integrated and
scalable surface functionalization by a high temperature gas-solid phase reaction protocol monitored via thermogravimetry
for very controlled and precise degraphitization, as well as hydrogen, oxygen and nitrogen (-NH2) functionalization in a
high temperature reactor. In particular, we discuss the rational and precise control of chemical functionalization through
introduction of functional groups and of an increased photoluminescence from additional nitrogen-vacancy defects
(NV-centers) produced via controlled electron beam irradiation. We have shown that multiple surface analytical methods
such as IR-, Raman, photoelectron spectroscopy, light scattering, and electron microscopies allow for quality control of
the surface functionalization.
bernd.abel@iom-leipzig.de(Non-van der Waal) Functionalization of graphene with retained trigonal lattice and charge
carrier mobility
Songwei Che
1
, Kabeer Jasuja
2
, Sanjay Behura
1
, Phong Nguyen
1
, T S Sreeprasad
3
and
Vikas Berry
1
1
University of Illinois at Chicago, USA
2
Indian Institute of Technology, India
3
Clemson University, USA
T
o widen the spectrum of its applications, it is important to functionalize graphene, while preserving its superior properties,
and retaining its planar lattice (for high mobility) and its carbons’ sp2 hybridized state (for high carrier density).
Such a functionalization mechanism, when conducted in compliance to the needs of semiconductor manufacturing processes
will enable graphene’s incorporation into diverse applications. Here, we develop a unique eta-6 organometallic approach to
functionalize graphene in a vapor-phase process, which retains the structural and electrical properties, while offering chemical
sites for interaction and interfacing with other chemical or biochemical systems. In contrast to other functionalization
processes, the eta6-functionalized graphene maintained its high charge carrier mobility (1000 cm2V-1s-1 at 300 K). We will
discuss the mechanism of charge transfer in eta-6 functionalization of chromium carbonyl on graphene. The chemical groups
were utilized for subsequent chemistry via an
in-situ
formation of silver nanoparticles at functionalization sites. We show that
this graphene-eta-6-Ag structure enables an ~11-fold plasmonic enhancement in the efficiency of graphene/n-Si solar cells
(1.24%) to exemplify the potential of this functionalization. This process will unveil graphene’s previously unknown potential
to hierarchically interface with physical and biological components to produce novel systems and applications. Results will also
facilitate gate-fabrication for FETs via atomic- layer-deposition (currently a major challenge).
vikasb@uic.edu