title: Alumina/epoxy nanocomposite matching layers for high-frequency ultrasound transducer application.
abstract: Mismatch of acoustic impedance at the interface between a piezoelectric transducer and the medium to be probed will substantially reduce the amount of ultrasound energy being transmitted into the medium. Therefore, matching layer is a critical component of an ultrasonic transducer. A spin-coating process was used to fabricate alumina/polymer nanocomposite films with alumina volume fractions ranging from 14 to 32%. The particle size of alumina is in the range of 10 to 40 nm. The thicknesses of the matching layer can be controlled by the spinning speed and the concentration of solution. Acoustic impedances of these nanocomposite matching layers are in the range of 2.8 to 5.1 MRayls with different alumina contents, which meet the matching layer requirement. The attenuation of a nanocomposite matching layer with smooth surface is about 15 dB/mm at 40 MHz. The pulse-echo spectrum and frequency spectrum of a high-frequency transducer using this nanocomposite matching layer are reported.
authors.affiliation: Department of Biomedical Engineering and NIH Transducer Resource Center, University of Southern California, Los Angeles, CA, USA.
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou
authors.forename: Jung Hyui
authors.initials: JH
authors.lastname: Cha
authors.forename: Yuhong
authors.initials: Y
authors.lastname: Huang
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.forename: Wenwu
authors.initials: W
authors.lastname: Cao
authors.forename: K Kirk
authors.initials: KK
authors.lastname: Shung
mesh_terms: D000162:Acoustics; D000537:Aluminum Oxide / Q000737:chemistry*; D017097:Electric Impedance; D004852:Epoxy Compounds / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D012107:Research Design; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation*
chemical_list: D004852:Epoxy Compounds; D000537:Aluminum Oxide