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Nano Research & Applications
ISSN 2471-9838
E u r o S c i C o n C o n f e r e n c e o n
Nanotechnology &
Smart Materials
O c t o b e r 0 4 - 0 6 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
Nanotechnology & Smart Materials 2018
2D materials, flexible electrodes and surfaces
Eui-Hyeok Yang
Stevens Institute of Technology, USA
I
will present three of our primary research topics, as each relates to 1D/2D materials, substrates and surfaces. Firstly, I will
focus on our investigation of chemical vapor deposition (CVD)-growth, achieving localized, patterned, single crystalline or
polycrystalline monolayers of TMDs, including MoS
2
, WS
2
, WSe
2
and MoSe
2
, as well as their heterostructures. We study CVD-
growth and perform extensive material characterization to illuminate the role of dissimilar 2D substrates in the prevention of
interior defects in TMDs, thus uncovering the conditions for anti-oxidation. We further demonstrate the epitaxial growth of TMDs
on hBN and graphene, as well as vertical/lateral heterostructures of TMDs, uniquely forming in-phase 2D heterostructures. This
research provides a detailed observation of the oxidation and anti-oxidation behaviors of TMDs, which corroborate the role of
underlying 2D layers in the prevention of interior defects in TMDs. If the technique could be developed to be highly reliable and high
fidelity, it could have a large impact on the future research and commercialization of TMD-based devices. The second research
area concerns our development and application of flexible electrodes and energy storage toward wearable and multifunctional
electronics. Here, we develop a facile fabrication technique utilizing vertically aligned carbon nanotubes (VACNTs), which enables
high-throughput fabrication of flexible supercapacitors. We develop an innovative technique, which facilitates a stable charge/
discharge under varied strains. Our structure shows a high flexibility and stability during stretching up to 20% and bending up to
180°. These flexible supercapacitors are promising for various flexible electronics applications. Lastly, we investigate and utilize
smart polymer functional surfaces using dodecylbenzenesulfonate-doped polypyrrole (PPy(DBS)); we demonstrate a novel
in
situ
control of droplet pinning on the polymer surface, enabling the control of droplet adhesion from strongly pinned to extremely
slippery (and vice versa). The pinning of organic droplets on the surfaces is dramatically controlled
in situ
, presenting great
potential for manipulation and control of liquid droplets for various applications including oil separation, water treatment and
anti-bacterial surfaces. In addition, we demonstrate controlled lateral actuation of organic droplets on PPy (DBS) electrodes in
an aqueous environment. We believe that our work represents a major advance in materials science and engineering, especially
pertaining to those topics that involve functional and tunable surfaces.
Nano Res Appl Volume:4
DOI: 10.21767/2471-9838-C6-025