title: Planar microphone based on piezoelectric electrospun poly(γ-benzyl-α,L-glutamate) nanofibers.
abstract: Velocity and pressure microphones composed of piezoelectric poly(γ-benzyl-α,L-glutamate) (PBLG) nanofibers were produced by adhering a single layer of PBLG film to a Mylar diaphragm. The device exhibited a sensitivity of -60 dBV/Pa in air, and both pressure and velocity response showed a broad frequency response that was primarily controlled by the stiffness of the supporting diaphragm. The pressure microphone response was ±3 dB between 200 Hz and 4 kHz when measured in a semi-anechoic chamber. Thermal stability, easy fabrication, and simple design make this single element transducer ideal for various applications including those for underwater and high temperature use.
authors.affiliation: Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218 kren2@jhu.edu.
authors.forename: Kailiang
authors.initials: K
authors.lastname: Ren
authors.affiliation: Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218 jimwest@jhu.edu.
authors.forename: James E
authors.initials: JE
authors.lastname: West
authors.affiliation: Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112 michael.yu@utah.edu.
authors.forename: S Michael
authors.initials: SM
authors.lastname: Yu
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D004867:Equipment Design; D008567:Membranes, Artificial; D008962:Models, Theoretical; D009038:Motion; D057139:Nanofibers; D011093:Polyethylene Terephthalates / Q000737:chemistry; D011099:Polyglutamic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013997:Time Factors; D014160:Transducers, Pressure
chemical_list: D008567:Membranes, Artificial; D011093:Polyethylene Terephthalates; C003172:poly-gamma-benzyl-L-glutamate; C025539:Lavsan; D011099:Polyglutamic Acid