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천소산(Sosan Cheon),박재성(Jae Sung Park),Kenneth David Kihm,김홍구(Honggu Kim),임규민(Gyumin Lim),이준식(Joon Sik Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Graphene is the most popular material in the academia and various industries, due to its exceptional material properties that can be used in diverse applications. In this presentation, the wettability and self-assembly of alumina nanofluids on the graphene coated glass surface are discussed. Also, the procedure of making the substrate, i.e. synthesis and transfer of graphene on glass substrates is reported. The evaporative self-assembly of alumina nanofluids are examined on CVD-synthesized graphene-coated glass (GC) slides and the cover glass (CG) alone. The measurements reveals that the GC is more hydrophobic (~90˚) than the CG (40˚). The evaporation processes on both the substrates are characterized by upright and inverted optical microscopy and goniometry and the result is explained in terms of the cavity/crack formation, the wettability of the substrate, and the evaporation time.
천소산(Sosan Cheon),Kenneth David Kihm,김홍구(Hong goo Kim),임규민(Gyumin Lim),박재성(Jae Sung Park),이준식(Joon Sik Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Starting from graphene, “atomically thin 2-D materials” has become one of the most popular research areas for the next industrial revolution. From electronic charge carrier mobility [1] to thermal conductivity [2], the physical properties of these 2-D materials are completely different from those of bulk materials, even though made from the same atomic element. One of the most promising and feasible applications of 2-D materials is that for transparent electrodes to replace the currently adopted but relatively expensive indium tin oxide (ITO), and still the most competent candidate is graphene and its derivatives. For these applications, not only electrical but also optical characterization is critical. However, the methods to measure optical properties of graphene [3-12] are imperfect yet, in terms of the availability, robustness, and accuracy. Moreover, there is no report on the proper optical properties measurement method for doped graphene by foreign atoms. In this work, two optical measurements, surface plasmon resonance (SPR) and attenuated total reflection (ATR), have been conducted in parallel, to measure the complex refractive index (RI) of graphene layers. The graphene layers are synthesized by chemical vapor deposition (CVD) and transferred onto glass or gold substrates. Comparison of theoretical calculation results with the experimental data can determine the optical properties, i.e. complex refractive indices, of the graphene layers uniquely.