Wonkyu Moon

Abstract Wearable auditory sensors are critical in user‐friendly sound‐recognition systems for smart human–machine interaction and the Internet of Things. However, previously reported wearable sensors have limited sound‐sensing quality as a consequence of a poor frequency response and a narrow acoustic‐pressure range. Here, a skin‐attachable acoustic sensor is presented that has higher sensing accuracy in wider auditory field than human ears, with flat frequency response (15–10 000 Hz) and a goo

ABSTRACT This study presents a new type of composite consisting of piezoelectric poly(γ‐benzyl‐α, l ‐glutamate) (PBLG) polymer fibers, which contain a large dipole moment, and the elastomer polydimethylsiloxane (PDMS) as the matrix material. PBLG microfibers were fabricated and polarized using the electrospinning method and cast in PDMS to form a unidirectional continuous‐fiber composite. The PBLG/PDMS composite was characterized based on various aspects such as crystalline structure, mechanical

ABSTRACT One of the latest developments in the field of piezoelectric polymers is the use of poly(γ‐benzyl‐α,L‐glutamate) (PBLG), a poly(amino acid) that can be poled along its α‐helical axis and fabricated into thermally stable piezoelectric microfibers via electrospinning. This study demonstrates a method for improving the piezoelectricity of electrospun PBLG microfibers by controlling the orientation of fibers using a method based on a concentrated electric field. The piezoelectricity is veri

Capacitive-type transduction is now widely used in MEMS microphones. However, its sensitivity decreases with reducing size, due to decreasing air gap capacitance. In the present study, we proposed and developed the Electret Gate of Field Effect Transistor (ElGoFET) transduction based on an electret and FET (field-effect-transistor) as a novel mechanism of MEMS microphone transduction. The ElGoFET transduction has the advantage that the sensitivity is dependent on the ratio of capacitance compone