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Byoung Wan Lee,Junho Ryeom,Jae-Hyeon Ko,Dong Wook Kim,Chan-Hum Park,Jaehoon Park,Young Ho Ko,Kwang Joo Kim 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.2
The elastic properties of a biocompatible silk film were investigated under temperature and pressure variations by using Brillouin spectroscopy. The Brillouin frequency shift decreased monotonically upon heating and showed a sudden change at the glass transition temperature. The existence of water molecules in the film increased the longitudinal modulus by approximately 10% and induced a relaxation peak in the hypersonic damping at 60 C. The pressure dependences of the sound velocities of the longitudinal and the transverse acoustic modes and the refractive index were determined for the first time at pressures up to 15.5 GPa. All these properties increased upon compression; these changes indicated that the free volume in the silk film collapsed at a pressure of about 3 GPa.
Terahertz conductivity of high-quality indium films deposited using a substrate cooling method
Choi Geunchang,Choi Dong-Hwan,Ryeom Junho,Park Dae Young,Kim Wu-Sin,Kim Ju-Jin,Bahk Young-Mi,Jeong Mun Seok 한국물리학회 2023 Current Applied Physics Vol.52 No.-
High-quality indium thin films were fabricated by substrate cooling method during the metal deposition. The cooling effect reduced the threshold thickness for insulator-to-metal transition, which originates from the interconnections between the indium nano-islands. The complex conductivities of the films were measured by terahertz time-domain spectroscopy. We showed that the conductivity of the indium films prepared by substrate cooling were ~10 times higher than that deposited at room temperature, even though thickness of the former was lower than that of the latter film. Our results suggest that substrate cooling is promising for the applications of metal thin films and contacts.