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Adhikari, Prashanta Dhoj,Kim, Sunghwan,Lee, Sui,Park, Chong-Yun American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.7
<P>Multi-walled carbon nanotubes (MWCNTs) were grown using iron oxide nanoclusters (Nc) assisted by self-assembled monolayer (SAM) on substrate. The amine-terminated SAM fabricated on silicon substrate (APTMS/SI) was carried out by UV-treatment and immersed into the FeCI3/HCI aqueous solution. Then, Nc were immobilized onto oxidized SAM silicon substrate (SAMs/Si) through electrostatic interaction between cationic Nc and anionic SAMs/Si. The characterization results clearly show that the well-graphitized MWCNTs were synthesized by using functionalized silicon substrate (Nc/SAMs/Si) as a template having appropriate density of catalyst. These consequences show that SAM containing template is important to achieve the effective layer of catalyst to synthesize MWCNTs in chemical vapor deposition (CVD).</P>
Adhikari, Prashanta Dhoj,Song, Wooseok,Cha, Myoung-Jun,Park, Chong-Yun Elsevier 2013 THIN SOLID FILMS - Vol.545 No.-
<P><B>Abstract</B></P> <P>This work reports the synthesis of high quality single-walled carbon nanotubes (SWCN<U>T</U>) using a catalytic layer reinforced by self-assembled monolayers (SA<U>M</U>). Amine-SAM was introduced on a SiO<SUB>2</SUB>/Si substrate and then an iron nanoparticles solution was dropped on the substrate by spin-coating. This catalytic template was used to grow carbon nanotubes by chemical vapor deposition and the synthesized SWCNT were observed to be prominent, based on the size distribution. Highly dense SWCNT with a diameter of about 1.1-1.2 nm were produced at 800-850 °C. Moreover, the diameter distribution of the SWCNT was more selective at a growth temperature of 900 °C. These findings provide important insights for a SAM support layer that can play the role as a restriction for the agglomeration of iron catalyst and is promising for the synthesis of high quality SWCNT.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe nanoparticles on self-assembled monolayers (SAM) containing template is underlined. </LI> <LI> Its catalytic behavior to synthesis single-walled carbon nanotubes is studied. </LI> <LI> The role of SAM on catalytic template is explored. </LI> </UL> </P>
Jumi Cho,정대성,Yooseok Kim,송우석,Prashanta Dhoj Adhikari,안기석,Chong-Yun Park 한국진공학회 2015 Applied Science and Convergence Technology Vol.24 No.3
The field-effect transistors (FETs) with a graphene-based p-n junction channel were fabricated using the patterned self-assembled monolayers (SAMs). The self-assembled 3-aminopropyltriethoxysilane (APTES) monolayer deposited on SiO2/Si substrate was patterned by hydrogen plasma using selective coating poly-methylmethacrylate (PMMA) as mask. The APTES-SAMS on the SiO2 surface were patterned using selective coating of PMMA. The APTES-SAMs of the region uncovered with PMMA was removed by hydrogen plasma. The graphene synthesized by thermal chemical vapor deposition was transferred onto the patterned APTES-SAM/SiO2 substrate. Both p-type and n-type graphene on the patterned SAM/SiO2 substrate were fabricated. The graphene-based p-n junction was studied using Raman spectroscopy and X-ray photoelectron spectroscopy. To implement low voltage operation device, via ionic liquid (BmimPF6) gate dielectric material, graphene-based p-n junction field effect transistors was fabricated, showing two significant separated Dirac points as a signature for formation of a p-n junction in the graphene channel.