Effect of Additives on the Properties of Printed ITO Sensors
Jieun Koo1,2, Seok-hwan Lee3, Sung-min Cho3, Jiho Chang1,3

1Department of Electronic Material Engineering, Korea Maritime and Ocean University, Busan 49112, Korea
2International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Ibarak 305-0047, Japan

3Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University, Busan 49112, Korea

The effects of additives on the methane gas sensing performance of printed indium tin oxide (ITO) sensor have been investigated. Room temperature sensing has been achieved under the methane flow of 100 ppm. Sensitivity and response speed of the printed ITO sensor has been greatly improved. The most advanced performance has been achieved from the ITO+(Ag, CNT) sensor. Ag and CNT co-incorporation results in 652-times large sensitivity and 88% fast response time in compare to the pure ITO sensor under the same test conditions.
J. Korean Phy. Soc. 2017; 71: 335-339  https://doi.org/10.3938/jkps.71.335
Properties of the t1 − t2 One-Dimensional Hubbard Model at Finite Temperature
SungKun Kim, Hunpyo Lee
Department of General Studies, Kangwon National University, Samcheok 25913, Korea
We investigated the properties of the half-filled one-dimensional t1 − t2 Hubbard model at finite temperature within a dynamical cluster approximation (DCA) approach with Nc = 24. The semiclassical approximation (SCA) method has been chosen as a quantum impurity solver. The SCA tool with a Monte Carlo (MC) update can capture long-range spatial fluctuations beyond exact numerical approaches such as exact diagonalization and quantum Monte Carlo tools, while dynamical fluctuations are freezing. We suggest novel paring MC update in the SCA tool and show good description of the frustrated one-dimensional systems at finite temperature. As former results obtained at zero temperature, we confirm not only the interaction-driven metal-insulator transition in the regions of t2 /t1 > 0.5 at low temperature, but also the commensurate-incommensurate transition by tunning t2 /t1 in the strong interaction region with U/t1 = 6. We also observe finite temperature-driven metal-insulator transition. We believe that the presented DCA+SCA approach is promising and can be applied to a variety of frustrated two- and three-dimensional interacting systems.
J. Korean Phy. Soc. 2017; 71: 191-195  https://doi.org/10.3938/jkps.71.191
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