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Samanta, Suman Kalyan,Song, Inho,Yoo, Jong Heun,Oh, Joon Hak American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.38
<P>Improving the charge-carrier mobility of conjugated polymers is important for developing high-performance, solution-processed optoelectronic devices. Although [1]benzothieno[3,2-<I>b</I>]benzothiophene (BTBT) has been frequently used as a high-performance p-type small molecular semiconductor and employed a few times as a building block for p-type conjugated polymers, it has never been explored as a donor moiety for high-performance n-type conjugated polymers. Here, BTBT has been conjugated with either n-type perylene diimide (PDI) or naphthalene diimide (NDI) units to generate a donor-acceptor copolymer backbone, for the first time. Charge-transport measurements of organic field-effect transistors show n-type dominant behaviors, with the electron mobility reaching ∼0.11 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP> for PDI-BTBT and ∼0.050 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP> for NDI-BTBT. The PDI-BTBT mobility value is one of the highest among the PDI-containing polymers. The high π-π stacking propensity of BTBT significantly improves the charge-carrier mobility in these polymers, as supported by atomic force microscopy and grazing incidence X-ray diffraction analyses. Phototransistor applications of these polymers in the n-type mode show highly sensitive photoresponses. Our findings demonstrate that incorporation of the BTBT donor unit within the rylene diimide acceptor-based conjugated polymers can improve the molecular ordering and electron mobility.</P> [FIG OMISSION]</BR>
유종현,( Suman Kalyan Samanta ),송인호,오준학 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Organic thin-film transistors (OTFTs) have suffered from insufficient mobility for commercial viability despite their intrinsic advantages such as light weight, flexibility and simple fabrication. Here, we report high performance OTFTs fabricated by simple solution processing of π -conjugated semiconducting copolymers based on [1]benzothieno [3,2-b]benzothiophene (BTBT) and perylene/naphthalene diimide (PDI/NDI) derivatives. The OTFTs showed n-channel dominant behaviors with superior mobility compared to that made of other copolymers based on PDI/NDI. The morphology and molecular packing of the copolymer thin films analyzed through atomic force microscopy (AFM) and grazing incidence X-ray diffraction (GIXD) together explained the high performance of OTFTs. Furthermore, the OTFTs exhibited phototransistor behaviors under visible light, showing potential of PDI / NDI copolymer-based OTFTs in photosensor application.
원유상,권오영,Suman Kalyan Samanta,유종현,오준학 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Strethcable, wearable, and bio-compatible soft electronic devices has been studied for its potential use in various applications, including prosthetics, soft robotics, and human-machine interfaces. Ionic conductive hydrogels are good candidates for surface-mount technology due to their excellent transparency and small resistance variation under high stretching states. Herein, we introduce a new type of stretchable self-healing and transparent touch sensor using hydrogel comprised of PVA, Borax, and poly(sodiumacrylate, NaAc). The hydrogel exhibits a fast self-healing capability which can restore over 95% of its initial conductivity within 7 s healing time. Moreover, no external stimuli (such as heat, pH, light, or catalyst) are required. The self-healing touch sensor is able to monitor the position of touch screens.
Kweon, O. Young,Samanta, Suman Kalyan,Won, Yousang,Yoo, Jong Heun,Oh, Joon Hak American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.29
<P>Multifunctional hydrogels with properties including transparency, flexibility, self-healing, and high electrical conductivity have attracted great attention for their potential application to soft electronic devices. The presence of an ionic species can make hydrogels conductive in nature. However, the conductivity of hydrogels is often influenced by temperature, due to the change of the internal nano/microscopic structure when temperature reaches the sol-gel phase transition temperature. In this regard, by introducing a novel surface-capacitive sensor device based on polymers with lower critical solution temperature (LCST) behavior, near-perfect stimulus discriminability of touch and temperature may be realized. Here, we demonstrate a multimodal sensor that can monitor the location of touch points and temperature simultaneously, using poly(<I>N</I>-isopropylacrylamide) (PNIPAAm) in hybrid poly(vinyl alcohol) (PVA) and sodium tetraborate decahydrate cross-linked hydrogels doped with poly(sodium acrylate) (SA) [w/w/w = 5:2.7:1-3]. This multimodal sensor exhibits a response time of 0.3 s and a temperature coefficient of resistance of −0.58% K<SUP>-1</SUP> from 20 to 40 °C. In addition, the LCST behavior of PNIPAAm-incorporated PVA/SA gels is investigated. Incorporation of LCST polymers into high-end hydrogel systems may contribute to the development of temperature-dependent soft electronics that can be applied in smart windows.</P> [FIG OMISSION]</BR>