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Copper Electrode Material using Copper Formate-Bicarbonate Complex for Printed Electronics
황재은,Sinhee Kim,Kevin Ray Ayag,HongDooKim 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
Copper ink has been prepared by mixing copper(II) formate and 2-ethyl-1-hexylammonium bicarbonate (EHABC) to overcome some weak points such as aggregation and degradation of copper nano-type ink. Ink was coated on glass substrate and calcined at 110 o C to 150 o C to generate electrically conductive copper film under two different atmospheres such as nitrogen gas and gaseous mixture of formic acid and methanol. The lowest resistivity of 1.88 ㏁·cm of copper film was obtained at 150℃ in gaseous formic acid condition. The long-term resistivity shows to increase from 1.88 ㏁·cm to 2.61㏁·cm after one month.
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Mir Muhammad Fahad,Mohammad Shamim Reza,Gajula Prasad,Sellamuthu N. Jaisankar,Kap-Jin Kim,HongDooKim 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
In this research, the triboelectric sensors are fabricated using a facile stacking of nonwoven thermoplasticpolyurethane (TPUnw) and as-spun thermoplastic polyurethane nanofiber web (TPUnf) with nonwoven polypropylene (PP),and as-cast silicone elastomer. The triboelectric output voltage of the sensor is examined by applying a periodic dynamicmechanical load ranging from 0.1 to1 kgf at a constant frequency of 1 Hz. Among the combinations, the TPUnw (3.3 V)gives almost 4 times higher peak-to-peak voltage (Vp-p) than TPUnf (0.9 V) with a given nonwoven PP fabric. Similarly, withas-cast rough silicone elastomer, the TPUnw (10.1 V) gives 20 % increase of Vp-p compared with TPUnf (7.9 V). From theabove results, we can conclude that the nonwoven TPU generates larger triboelectric voltages than the electrospun TPUnanoweb and it may be due to the higher roughness of the former than the latter. Compared to nonwoven PP, the roughsurface silicone elastomer (Si) gives almost 3 times larger Vp-p with TPUnw. The combinative effect of triboelectric polarityand surface roughness plays a significant role in the enhancement of Vp-p in Si combination rather than PP. In addition to this,the potential applications of physiological vital signs (respiration and heartbeat rate) and movements of a human areexamined during polysomnographic (PSG) measurement with TPUnw-PP senor using a BIOPAC MP150 data acquisitionsystem in conjunction with a signal conditioner. During PSG measurement, the heartbeat and respiration at four differentpositions are successfully measured. Apneic events and disruptive body movements were also easily observed.
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