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Technology Review WRITTEN BY Graphene Square 2016-11-29

Recent advance in Graphene & 2D materials research for thermoelectric application
Thermoelectric materials (TEM) have been a promising technology for producing electricity from heat that would otherwise just be wasted. Thermoelectric research has regained renewed attention recently because of the huge potential of TEM to be applied in Peltier coolers and thermoelectric power generators. The thermoelectric effect is the phenomena by which either a temperature difference creates an electric potential or an electric potential creates a temperature difference. As for all heat engines,.....
Technology Review WRITTEN BY Graphene Square 2016-08-25

Technology Review - EMI shielding
Electromagnetic wave is a form of energy that occurs due to the use of electricity, which has a broad range of frequency. Notably, studies have shown that lengthened exposure to frequency below 500KHz can harmful impacts on human body such as change in body temperature, reduction in number of sperms, and menstrual irregularity. Electromagnetic wave is accumulated in human body as a form of energy, producing harmful effects by reducing biorhythms......
Technology Review WRITTEN BY Graphene Square 2016-07-22

Technology Review - R2R
Graphene discovered while exfoliating from bulk graphite with mechanical cleavage using Scotch tape in 2004 has excellent electrical conductivity and mechanical characteristics. Owing to its transparent and flexible features, it has been studied widely until now. In spite of such excellent properties, it has been difficult to synthesize graphene en masse, as the mass production technology has not been developed. Thus, it has been difficult to conduct researches on technology which can be applicable actually.....
Technology Review WRITTEN BY Graphene Square 2016-06-20

Technology Review - 3D touch
In September 2015, Huawei, the Chinese smartphone maker, unveiled the world’s first smartphone loaded with force touch. One week later, Apple launched iPhone 6S, for which it presented 3D touch as technological forte. 3D touch is pressure sensitive technology and executes specific functions by responding to different levels of pressure. The new interface, which consists in pressure detection in touch sensor, is now drawing spotlight, touted as the next generation of multitouch....
Technology Review WRITTEN BY Graphene Square 2016-03-29

CVD graphene film provided by Graphene Square was used in provskite solar cell as transparent conductive electrode.
Global Frontier Center for Multiscale Energy Systems at the Seoul National University, with the presence of professor of mechanical engineering, Man-su Choi, is positioned to develop the original technology for future renewable energy systems. The researchers, Hyang-gi Seong and Nam-young Ahn, also released a paper, in December 2015, about high-efficient Perovskite Solar Cell by applying graphene transparent film instead of transparent conductive oxide currently represented by ITO or FTO, which was released as the cover article in the journal,Advanced Energy Materials ....
Technology Review WRITTEN BY Graphene Square 2016-01-06

Edible salt crystals: a cheap, green, water soluble substrate for graphene synthesis
Graphene, a single layer of carbon atoms arranged into honeycomb lattice, a so-called “wonder materials” with its fantastic properties, has continuously attracted researchers’ attention since 2004 due to its high carrier mobility, superior electrical conductivity, high thermal conductivity, high Young’s modulus, and high specific surface area. These unique properties of graphene are being exploited for many potential applications in various fields such as high performance polymer nanocomposites, sensors, energy storage & conversion (supercapacitors, batteries, LEDs, solar ....

Representitive Publication
- "Large-Scale Pattern Growth of Graphene Films for Stretchable Transparent Electrodes." Nature 457, 706 (2009) Problems associated with large-scale pattern growth of graphene constitute one of themain obstacles to using thismaterial in device applications1. Recently, macroscopic-scale graphene films were prepared by two-dimensional assembly of graphene sheets chem-ically derived from graphite crystals and graphene oxides2,3 . However, the sheet resistance of these films was found to be much larger than theoretically expected values. Here we report the direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers, and present two differentmethods of patterning the films and transferring them to arbitrary substrates. The transferred graphene films show very low sheet resistance of 280Vper square, with 80 per cent optical transparency......
- "Scaling of Resistance and Electron Mean Free Path of Single-Walled Carbon Nanotubes" Phys. Rev. Lett, 98, 186808 (2007). We present an experimental investigation on the scaling of resistance in individual single walled carbon nanotube devices with channel lengths that vary four orders of magnitude on the same sample. The electron mean free path is obtained from the linear scaling of resistance with length at various temperatures. The low temperature mean free path is determined by impurity scattering, while at high temperature the mean free path decreases with increasing temperature, indicating that it is limited by electron-phonon scattering. An unusually long mean free path at room temperature has been experimentally confirmed. Exponentially increasing resistance with length at extremely long length scales suggests anomalous localization effects.

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