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Home > Research Achievements > Research Highlight

Research Highlight

Synthesis of integrated graphene films with self-assembled single-layer channels and multi-layer electrodes via a single process
Date2016.07.25 11:47 Hit897

Integrated graphene films (IGFs) with self-assembled single-layer graphene as a channel and multi-layer graphene as an electrode material were synthesized simultaneously using a one-step process by thermal chemical vapor deposition. The prominent difference in graphene growth rate between Ni and Cu catalytic substrates made enable to synthesize the IGFs with self-assembled single-layer and multi-layer graphene on a Cu foil with pre-patterned Ni films. The thickness of multi-layer graphene for IGFs was precisely controlled by optimizing conditions including the injection temperature of carbon feedstock and the surface concentration of Ni atoms affected by the inter-diffusion related to the growth temperature and time. The thickness and crystallinity of synthesized IGFs were evaluated by resonant Raman spectroscopy. We fabricated the IGFs-based field effect transistors (FETs) to examine electrical transport properties of the films. These results suggest that the synthesis technique for IGFs could lead to mass fabrication of wearable graphene-based FETs in the near future.

 

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  • Corresponding author: Ki-Seok An
  • Research Group: Center for Thin Film Materials
  • Office: +82-42-860-7356
  • E-mail: ksan@krict.re.kr

Highlight of the Month July 2016

Synthesis of integrated graphene films with self-assembled single-layer channels and multi-layer electrodes via a single process
J. Mater. Chem. A, 2016, 4, 837–843 DOI: 10.1039/C6TA01625A
Integrated graphene films (IGFs) with self-assembled single-layer graphene as a channel and multi-layer graphene as an electrode material were synthesized simultaneously using a one-step process by thermal chemical vapor deposition.

more highlights of the month



Monthly Research Highlights

Nanogenerators consisting of direct-grown piezoelectrics on multi-walled carbon nanotubes using flexoelectric effects
Scientific Reports 6, 2016, 29562 DOI: 10.1038/srep29562
We report the first attempt to prepare a flexoelectric nanogenerator consisting of direct-grown piezoelectrics on multi-walled carbon nanotubes (mwCNT).

A highly efficient covalent organic framework film photocatalyst for selective solar fuel production from CO2
J. Mater. Chem. A, 2016, 4, 9413-9418 DOI: 10.1039/C6TA01625A
Two-dimensional covalent organic frameworks (2D COFs) are a class of crystalline polymers with a design controllable platform that may be developed into a new type of metal-free photocatalyst.

Impact of the Crystalline Packing Structures on Charge Transport and Recombination via Alkyl Chain Tunability of DPP-Based Small Molecules in Bulk Heterojunction Solar Cells
ACS Appl. Mater. Interfaces, 2016, 8(20), 12940–12950 DOI: 10.1021/acsami.6b01576
A series of small compound materials based on benzodithiophene (BDT) and diketopyrrolopyrrole (DPP) with three different alkyl side chains were synthesized and used for organic photovoltaics. These small compounds had different alkyl branches (i.e.,

Wafer-Scale, Homogeneous MoS2 Layers on Plastic Substrates for Flexible Visible-Light Photodetectors
Advanced Materials, 2016, 28(25), 5025–5030 DOI: 10.1002/adma.201600606
An appropriate solution is suggested for synthesizing wafer-scale, continuous, and stoichiometric MoS2 layers with spatial homogeneity at the low temperature of 450°C. It is also demonstrated that the MoS2-based visible-light photodetector arrays are

Facile Preparation of Highly Conductive Metal Oxides by Self-Combustion for Solution-Processed Thermoelectric Generators
ACS Appl. Mater. Interfaces, 2016, 8(8), 5216–5223 DOI: 10.1021/acsami.5b10187
Highly conductive indium zinc oxide (IZO) thin films were successfully fabricated via a self-combustion reaction for application in solution-processed thermoelectric devices. Self-combustion efficiently facilitates the conversion of soluble precursor

Facile synthesis of palladium nanodendrites supported on graphene nanoplatelets: an efficient catalyst for low overpotentials in lithium–oxygen batteries
J. Mater. Chem. A, 2016, 4, 578-586 DOI: 10.1039/C5TA08957C
Although morphology-controlled metal nanocatalysts supported on graphene sheets are promising, highly effective catalysts for various electrochemical reactions, their preparation is still challenging. In this paper, we report a facile method for prep

Solution Synthesis of Telluride-based Nano-barbell Structures Coated with PEDOT:PSS for Spray-printed Thermoelectric Generators
Nanoscale, 2016, 8, 10885-10890 DOI: 10.1039/C5NR07032E
Solution-processable telluride-based heterostructures coated with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (Te–Bi2Te3/PEDOT:PSS) were synthesized through a solution-phase reaction at low temperatures. The water-based synthesis yielded

Direct confinement of Ru nanoparticles inside nanochannels of large pore mesoporous aluminosilicate for Fischer-Tropsch synthesis
Journal of Materials Chemistry A, 2015, 3, 23725-23731 DOI: 10.1039/C5TA06184A
Metal/ordered mesoporous aluminosilicates (OMAS) have received great attention as bifunctional Fischer–Tropsch (FT) catalysts that directly convert syngas into liquid fuels. However, both synthesis of OMAS with large pores and efficient pore confinem

Gold Cluster-Labeled Thermosensitive Liposomes Enhance Triggered Drug Release in the Tumor Microenvironment by a Photothermal Effect
Journal of Controlled Release, 2015, 216, 132-139 DOI: 10.1016/j.jconrel
Stimulus-triggered drug release based on the liposomal drug delivery platform has been studied vigorously to increase drug release at the target site. Although the delivery system has been developed, an effective carrier system is needed to achieve e

Repositioning Potential of PAK4 to Osteoclastic Bone Resorption
Journal of Bone and Mineral Research, 2015, 30(8), 1494-507 DOI: 10.1002/jbmr.2468
Drug repositioning is a rational approach for expanding the use of existing drugs or candidate drugs to treat additional disorders. Here we investigated the possibility of using the anticancer p21-activated kinase 4 (PAK4)-targeted inhibitor PF-37583

A Surface Chemical Reaction in Organic-Inorganic Materials Using a New Chemical Evaporation System
Chemistry of Materials, 2015, 27(13), 4546–4551 DOI: 10.1021/acs.chemmater.5b00377
We report the surface reaction that occurs in organic–inorganic thin films using a hybrid deposition system that combines thermal evaporation (TE) and metalation processes. Growth of a smooth, uniform organic–inorganic hybrid thin film was demonstrat

Efficient ethanol production from dried oil palm trunk treated by hydrothermolysis and subsequent enzymatic hydrolysis
Biotechnology for Biofuels, 2015, 8:83 DOI: 10.1186/s13068-015-0263-6
Oil palm trunk (OPT) is a valuable bioresource for the biorefinery industry producing biofuels and biochemicals. It has the distinct feature of containing a large amount of starch, which, unlike cellulose, can be easily solubilized by water when heat

An integrated process for the production of 2,5-dimethylfuran from fructose
Green Chemistry, 2015, 17, 3310-3313, DOI: 10.1039/C5GC00281H
2,5-Dimethylfuran was successfully produced in 92% overall yield from fructose in 1-butanol through a combination of dehydration over Amberlyst-15 and hydrogenolysis over the Ru–Sn/ZnO catalyst. The environmental favorability of this process, and its

Thermoset Elastomers Derived from Carvomenthide
Biomacromolecules, 2015, 16(1), 246–256
Renewable thermoset elastomers were prepared using the plant-based monomer carvomenthide. Controlled ring-opening transesterification polymerization of carvomenthide using diethylene glycol as an initiator gave α,ω-dihydroxyl poly(carvomenthide) (HO-

Compositional engineering of perovskite materials for high performance solar cells
Nature, 2015, 517, 476–480, DOI: 10.1038/nature14133
Of the many materials and methodologies aimed at producing low-cost, efficient photovoltaic cells, inorganic–organic lead halide perovskite materials appear particularly promising for next-generation solar devices owing to their high power conversion

Compositional engineering of perovskite materials for high-performance solar cells
published in Nature, 2015; doi:10.1038/nature14133
Of the many materials and methodologies aimed at producing low-cost, efficient photovoltaic cells, inorganic–organic lead halide perovskite materials appear particularly promising for next-generation solar devices owing to their high power conversion

Growth of p-Type Tin(II) Monoxide Thin Films by Atomic Layer Deposition from Bis(1-dimethylamino-2-methyl-2propoxy)tin and H2O
published in Chem. Mater., 2014, 26(21), 6088–6091
We successfully developed an ALD process for single-phase SnO films with negligible impurity levels at low deposition temperatures of 90–210 °C from the bis(1-dimethyamino-2-methyl-2propoxy)tin(II) precursor and H2O. The SnO ALD exhibited self-limiti

A highly stretchable, helical copper nanowire conductor exhibiting a stretchability of 700%
published inNPG Asia Materials (2014) 6, e132; doi:10.1038/am.2014.88
Recent advances in unconventional foldable and stretchable electronics have forged a new field in electronics. However, traditional conducting metal oxides and metal thin films are inappropriate as electrodes for stretchable devices because they are

Highly Selective Solar-Driven Methanol from CO2 by a Photocatalyst/Biocatalyst Integrated System
published in J. Am. Chem. Soc.,2014, 136 (48), 16728–16731
The successful development of a photocatalyst/biocatalyst integrated system that carries out selective methanol production from CO2 is reported herein. The fine-tuned system was derived from a judicious combination of graphene-based visible light act

Thiolated DNA-Based Chemistry and Control in the Structure and Optical Properties of Plasmonic Nanoparticles with Ultrasmall Interior Nanogap
published in Journal Of The American Chemical Society, 2014, 136 (40), 14052–14059
The design, synthesis and control of plasmonic nanostructures, especially with ultrasmall plasmonically coupled nanogap (∼1 nm or smaller), are of significant interest and importance in chemistry, nanoscience, materials science, optics and nanobiotec