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Gajula Prasad,Mir Muhammad Fahad,Reza Mohammad Shamim,김갑진,김홍두,Sellamuthu N. Jaisankar 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The wearable self-powered tactile triboelectric sensor is a most promising candidate in the recent development of smart electronics which can recognize various physical stimuli without using any external power source. In this paper, triboelectric sensors are fabricated by using micron level rough structured silicone elastomer with different nonwoven fabrics (thermoplastic polyurethane (TPU) and polypropylene (PP)) and simultaneously compared with smooth silicone elastomer. The sensors fabricated by using rough silicon elastomers (56 V) with TPU (56 V) and PP (19 V) shows almost 8 and 6-times better peak to peak (Vp-p) than smooth one (7 V) and PP (3 V) sensors, respectively. Compared to PP with silicon sensor, the TPU with silicon sensor shows higher Vp-p voltages irrespective of roughness because TPU has a higher tribo-positive character than PP according to triboelectric series. These wearable triboelectric sensors have potential applications in sensing human motion monitoring.
Polyurethane/Polyvinylidene Fluoride Blend Electrospun Nanofiber Web Based Hybrid Tactile Sensor
Reza Mohammad Shamim,Mir Muhammad Fahad,Gajula Prasad,Sellamuthu N. Jaisankar,김갑진,김홍두 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Electrospun polyurethane (PU) nanofiber webs (NFw) having very high amount of nano-sized open cell can be used as a piezo-capacitive sensor due to excellent electrospinnability and very good elastic properties that has been reported in our previous study. In contrast, electrospun PVDF exhibits high β-crystalline phase content and superior piezoelectricity. Consequently, in this study, PU/PVDF blends under controlled compositions were electrospun to obtain PU/PVDF hybrid NFw. These hybrid sensors are capable of measuring piezocapacitive properties as well as simultaneously piezoelectric properties. Moreover, AgNO₃ was added into PVDF e-spun solution which acts as Ag-NPs in PVDF NFw to get enhanced piezoelectric performance of the hybrid sensor. Around 25% addition of PVDF into PU solution in the presence of Ag-NPs greatly enhance the peak-to-peak piezoelectric output voltage (Vp-p) along with 4.2% hysteresis and pressure-capacitance change of over 55 pF.
Mir Muhammad Fahad,Reza Mohammad Shamim,Gajula Prasad,Sellamuthu N. Jaisankar,김갑진,김홍두 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Nonwoven flexible textile materials thermoplastic polyurethane (TPU) and polypropylene (PP) were used to fabricate a self-powered triboelectric pressure sensor which effectively determined the heartbeat and respiration rate of a human subject. TPU and PP intrinsically owns opposite triboelectric polarity and nonwoven construction of the material accelerated the efficiency of the sensor. The sensor exhibited significant amount of output voltage. Peak to peak voltage (Vp-p) of around 3.3 V was obtained from prototype sensor using custom-made dynamic tester under periodic external load of 0.1~1.0 kgf. Physiological sensor successfully converted human body generated low frequency physio-mechanical vibrations into electrical signal which was received through Piezo Film Lab Amplifier equipped with BIOPAC MP150. From recorded signal, convoluted respiration and heartbeat frequencies were isolated and evaluated.
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.