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Soft, adhesive and conductive composite for electroencephalogram signal quality improvement
Jeong E Jin,Seohyeon Kim,Hyeji Yu,Keyong Nam Lee,Young Rag Do,Seung Min Lee 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.3
Since electroencephalogram (EEG) is a very small electrical signal from the brain, it is very vulnerable to external noise ormotion artifact, making it difficult to measure. Therefore, despite the excellent convenience of dry electrodes, wet electrodeshave been used. To solve this problem, self-adhesive and conductive composites using carbon nanotubes (CNTs) in adhesivepolydimethylsiloxane (aPDMS), which can have the advantages of both dry and wet electrodes, have been developed bymixing them uniformly with methyl group-terminated PDMS. The CNT/aPDMS composite has a low Young's modulus,penetrates the skin well, has a high contact area, and excellent adhesion and conductivity, so the signal quality is enhanced. As a result of the EEG measurement test, although it was a dry electrode, results comparable to those of a wet electrode wereobtained in terms of impedance and motion noise. It also shows excellent biocompatibility in a human fibroblast cell test anda week-long skin reaction test, so it can measure EEG with high signal quality for a long period of time.
Eo, Yun Jae,Yoo, Gang Yeol,Kang, Hyelim,Lee, Young Ki,Kim, Chan Sik,Oh, Ji Hye,Lee, Keyong Nam,Kim, Woong,Do, Young Rag American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.43
<P>We introduce an orientation-controlled alignment process of p-GaN/InGaN multiquantum-well/n-GaN (p/MQW/n InGaN) nanorod light-emitting diodes (LEDs) by applying the direct current (DC) offset-alternating current (AC) or pulsed DC electric fields across interdigitated metal electrodes. The as-forwardly aligned p/MQW/n InGaN nanorod LEDs by a pulsed DC dielectrophoresis (DEP) assembly process improve the electroluminescence (EL) intensities by 1.8 times compared to the conventional AC DEP assembly process under DC electric field operation and exhibit an enhanced applied current and EL brightness in the current-voltage and EL intensity-voltage curves, which can be directly used as the fundamental data to construct DC-operated nanorod LED devices, such as LED areal surface lightings, scalable lightings (micrometers to inches) and formable surface lightings. The enhancement in the applied current, the improved EL intensity, and the increased number of forwardly aligned p/MQW/n InGaN nanorods in panchromatic cathodoluminescence images confirm the considerable enhancement of forwardly aligned one-dimensional nanorod LEDs between two opposite electrodes using DC offset-AC or a pulsed DC electric field DEP assembly process. These DC offset-AC or pulsed DC electric field DEP assembly processes suggest that designing for these types of interactions could yield new ways to control the orientation of asymmetric p/MQW/n InGaN diode-type LED nanorods with a relatively low aspect ratio.</P>