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Alfred Bekoe Appiagyei,Jomaris Banua,한정인 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
Flexible Resistive Temperature Detectors (RTDs) based on metal thinfilm have broad applicationprospects in smart clothes, however, they are constructed with patterned metalfilms using complicatedmanufacturing processes. Herein, we report a simple radio frequency (RF) magnetron sputtering methodto fabricate light-weight, inexpensive andflexible temperature sensors (TS), whose sensitive materialsact as electrode itself composed of Ni, NiO and Ni/NiO bilayer thinfilms. The Ni/NiO bilayer TS could bebent in different radius with resistance change below 5% signifying highflexibility. Fabricated Ni/NiObilayer TS exhibited superior sensing performance with temperature coefficient of resistance (TCR) of3.8 10 3 C 1 compared to 3.2 10 3 C 1 and 3.110 3 C 1 for Ni and NiO thinfilms respectively. Itshowed a linear response with R2-value of 0.9852. The Ni/NiO bilayer TS showed TCR of 1.0 10 4 C 1even after 16,000 repetitive mechanical bends. Ni/NiO temperature sensor maintains high TCR towardsexposure to different chemical solutions (acid, alkaline, detergents). The easy-fabrication process withgood surface condition, together with the demonstrated results, suggest Ni/NiO is a promising candidateforflexible RTD device.
Alfred Bekoe Appiagyei,Jeong In Han 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
Supercapacitors remains one of the energy storage devices with high power density and long cycle life. High capacitive devices are required to boost the energy demand in the globe currently. Here in this study, we report rGO wrapped nickel cobalt sulphide heterostructure for supercapacitor application. The capacitance achieved more than 2000 F/g with retention of 93% after 20,000 cycles. This stands as a potential electrode for future application.