6 August 2014 Noise-driven signal transmission device using molecular dynamics of organic polymers
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Abstract
Stochastic threshold devices using a trap-filling transition (TFT) coupled with molecular dynamics in poly(3-alkylthiophene)s were fabricated as potential key devices for noise-driven bioinspired sensors and information processors. This article deals with variable-temperature direct current conductivity and alternating current impedance measurements for vertical-type device elements of Au/regioregular poly(3-decylthiophene) ((RR−P3DT) (thickness:  100  nm)/Au, which show multiple conducting states and quasi-stochastic transitions between these states. Noise measurements indicate the ω−2-type (if VTFT=10  V) and ω−1-type (if VV and VTFT are an applied voltage and the voltage for TFT, respectively. The noise generation is due to the TFT associated with twist dynamics of π-conjugated polymers near the order-disorder phase transition (ODT). At 298 K, the quasi-stochastic behavior is more noticeable for RR-P3DT than poly(3-hexylthiophene). The quasi-stochastic property is employed to a stochastic one-directional signal transmitting device using optical-electric conversion. The dynamics of ODT for powder samples were also investigated by differential scanning calorimetry measurements and high-resolution solid-state 13C nuclear magnetic resonance spectroscopy, and the correlation of the molecular structure and dynamics with electric properties was discussed.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Naoki Asakawa, Naoki Asakawa, Koichiro Umemura, Koichiro Umemura, Shinya Fujise, Shinya Fujise, Koji Yazawa, Koji Yazawa, Tadashi Shimizu, Tadashi Shimizu, Masataka Tansho, Masataka Tansho, Teruo Kanki, Teruo Kanki, Hidekazu Tanaka, Hidekazu Tanaka, } "Noise-driven signal transmission device using molecular dynamics of organic polymers," Journal of Nanophotonics 8(1), 083077 (6 August 2014). https://doi.org/10.1117/1.JNP.8.083077 . Submission:
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