Kim Y-S – TechConnect Briefs

The Effect of Thermal Annealing Processes on Graphene

Kumar K., Kim Y-S, Li X., Tian Y., Pallikaras A., Yang E.H., Stevens Institute of Technology, US

We demonstrate the impact of PMMA removal from CVD graphene by annealing in H2/Ar and ambient atmospheres as well as under vacuum on the Raman spectra and AFM topography of graphene. We find a broad [...]

Fabrication and Characterization of 3-D Graphene-CNT Architectures Towards Supercapacitor Applications

Kim Y-S, Kumar K., Li X., Fisher F.T., Yang E.H., Stevens Institute of Technology, US

This work describes the first steps towards fabrication and characterization of a novel hybrid nanostructure comprised of carbon nanotubes (CNTs) grown out-of-plane from graphene layers for supercapacitor applications. Graphene is a promising material for supercapacitors, [...]

Characterizing Nanoparticle Emissions from Burning Polymer Nanocomposites

Nyden M.R., Harris R.H., Kim Y-S, Davis R.D., Marsh N.D., Zammarano M., National Institute of Standards and Technology, US

At Nanotech 2009, we presented evidence that CNFs used as fire retardants in polyurethane foam (PUF), were destroyed in the flames and, therefore, were not released when CNF containing foams are burned under well-ventilated conditions. [...]

Synthesis of thermal interface material with high thermal conductivity for high efficacy of LED

Han C.J., Han J.-I., Yu S.H., Hong S-J, Kim Y-S, Han C.J., Han J.-I., Korean Electronics Technology Institute, KR

Thermal dissipation problem for LED is critical for high efficacy and reliability. Inorganic filled grease type thermal interface material (TIM) has widespread use for heat management of LED. Conventional TIM materials, however, has relative low [...]

Synthesis of thermal interface material with high thermal conductivity for high efficacy of LED

Han C.J., Han J.-I., Yu S.H., Hong S-J, Kim Y-S, Han C.J., Han J.-I., Korean Electronics Technology Institute, KR

Thermal dissipation problem for LED is critical for high efficacy and reliability. Inorganic filled grease type thermal interface material (TIM) has widespread use for heat management of LED. Conventional TIM materials, however, has relative low [...]

Low Temperature Volatile-Organic-Compound (VOC) Sensor Based on Tungsten Oxide Nanorods

Kim Y-S, Kim Y.T., Kim Y-S, Kim Y.T., Lee K., Electronics and Telecommunications Research Institute (ETRI), KR

Tungsten oxide sensors were fabricated by using highly crystalline and homogeneous WO2.72 nanorods, previously synthesized and characterized with average 75-nm length and 4-nm diameter [1]. They provide unique opportunities for investigating the effects of size-controlled [...]

Ab Initio Calculations on Magnetic Properties of Diluted Magnetic Semiconductors

Kim H., Kim Y-S, Kim H., Kim Y-S, Chung Y-C, Hanyang University, KR

Some diluted magnetic semiconductors (DMS), in which magnetic elements are substituted for a small fraction (~5%) of host elements in a semiconductor lattice, show ferromagnetism, and thus possess potential applicability in spintronics. To obtain quantum-mechanical [...]