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Research

Research Fields

Flexible Piezo Sensor
Flexible optoelectronics
Self-powered energy
Laser-material interaction
Flexible LSI & Memristor
Flexible drug delivery

      Flexible Inorganic Piezolectric Acoustic Sensor

   Voice recognition (VR) is the most straight forward and intuitive user-interface for the future IoT era. FAND's smart acoustic sensor is based on unique flexible piezoelectric materials and device structure , which mimics a human cochlear organ.  

  We have developed multi-channel acoustic sensor capable of highly sensitive recognition of human voice frequency band, 200 ~ 4kHz. In particular, our smart acoustic sensor has 4 to 8 times more sensitivity compare to the conventional microphone, that enables voice recognition from a distance. In a speaker recognition rate test, FAND's acoustic sensor was 97.5% and a reference microphone used in commercial cellular phone was 90%, which was 75% reduction in error rate compared to reference microphone under the same conditions. FAND group's multi-channel acoustic sensor can be applicable in the field of low power VR, AI, smart home applicances, connected car, voice security, and etc. 

 

  • Related References

"Flexible Inorganic Piezoelectric Acoustic Nanosensor for Biomimetic Artificial Hair Cell" Adv. Func. Mater., 24, 6914, 2014, PDF [IF=11.4]

"Basilar Membrane-Inspired Self-Powered Acoustic Sensor Enabled by Highly Sensitive Multi Tunable Frequency Band", Nano Energy, 53, 198, 2018, PDF [IF=13.1]

"Machine Learning-based Self-powered Acoustic Sensor for Speaker Recognition", Nano Energy, in press

     Flexible Inorganic Piezolectric Pressure Sensor

    Flexible pressure sensor is becoming essential in future applications, such as humanoid robotics, motion detection and real-time health monitoring devices. Many researchers have developed capacitive, piezoresistive pressure sensors, however, these sensors have drawbacks of high power consumption, low sensitivity, static stimuli and low frequency detection.  Compared to piezoresistive pressure sensors, our flexible piezoelectric sensor has advantages over other types of pressure sensors, such as high sensitivity and fast response of dynamic load, high frequency detection, simple readout circuit and low power consumption for wearable applications. Our group has developed flexible piezoelectric pressure sensor on ultra-thin plastic substrate and successfully detected periodic radial artery pulses on wrist, which can be used in mobile health monitoring and remote diagnostics of cardiovascular diseases.

  • Related References

"Self-Powered Real-Time Arterial Pulse Monitoring using Ultrathin Epidermal Piezoelectric Sensors", Adv. Mater., 29, 1702308, 2017 PDF [IF=19.8]

"In Vivo Self-Powered Wireless Transmission Using Biocompatible Flexible Energy Harvesters", Adv. Funct. Mater., 27, 1700341, 2017. PDF [IF=12.1] Cover Article