講演情報
[19a-D902-3]Highly Sensitive Nanofiber-based Stretchable Mechano-acoustic Sensor
〇(M2)Jiaying Xu1, Nayeem Md Osman Goni1, Suksmandhira Harimurti1 (1.Tokyo Univ.)
キーワード：
acoustic sensor、nanomesh
Mechano-acoustic (MA) signal is caused by natural processes in the human body, which can be monitored and analyzed to obtain a variety of important physiological health information. In recent years, with the development of wearable devices, mechano-acoustic sensors have been applied to various fields, achieving great breakthroughs in heart sound monitoring[1], swallowing monitoring[2], etc. However, for the existing sensors, yet it is still impossible to achieve high sensitivity, stretchability, and good wearing experience at the same time.
In this research, we proposed a kind of mechano-acoustic sensor using the triboelectric principle and piezoelectric principle of PVDF material, which can eventually achieve high sensitivity and stretchability as well. The electrode is polyurethane (PU) nanofiber prepared by electrospinning. Heat press process (150 °C for 5 minutes) is applied to PU nanofiber for the first time to reduce the high resistance caused by the porous structure and enhance the mechanical durability, then gold is evaporated on the surface of fiber. The active layer is made of PVDF nanofiber. At last, three layers are sandwiched together (Fig.1(a), (b)). Result shows that the device can stably detect the single sound given by the sound source. Due to the ultrathin nanofiber structure, it shows very high sensitivity, with the maximum reaches 6944 mV Pa-1 at 95 dB (Fig.1(c)). The device also shows a great performance at the frequency range of 40-225 Hz, being sufficient for the detection of most physiological signals. Moreover, the device is proved to be stretchable, with maximum strain of 35% and good repeatability in the stretching test. With the characteristic of high sensitivity and stretchability, the sensor is expected to have high performance and reusability in mechano-acoustic signal sensing.
Reference:
[1] Yuhao Liu. et al. Sci. Adv. 2016, 2, e1601185
[2] Gupta, P. et al. npj Digit. 2020, 3, 19
In this research, we proposed a kind of mechano-acoustic sensor using the triboelectric principle and piezoelectric principle of PVDF material, which can eventually achieve high sensitivity and stretchability as well. The electrode is polyurethane (PU) nanofiber prepared by electrospinning. Heat press process (150 °C for 5 minutes) is applied to PU nanofiber for the first time to reduce the high resistance caused by the porous structure and enhance the mechanical durability, then gold is evaporated on the surface of fiber. The active layer is made of PVDF nanofiber. At last, three layers are sandwiched together (Fig.1(a), (b)). Result shows that the device can stably detect the single sound given by the sound source. Due to the ultrathin nanofiber structure, it shows very high sensitivity, with the maximum reaches 6944 mV Pa-1 at 95 dB (Fig.1(c)). The device also shows a great performance at the frequency range of 40-225 Hz, being sufficient for the detection of most physiological signals. Moreover, the device is proved to be stretchable, with maximum strain of 35% and good repeatability in the stretching test. With the characteristic of high sensitivity and stretchability, the sensor is expected to have high performance and reusability in mechano-acoustic signal sensing.
Reference:
[1] Yuhao Liu. et al. Sci. Adv. 2016, 2, e1601185
[2] Gupta, P. et al. npj Digit. 2020, 3, 19