Silicon oxide colloidalpolymer nanocomposite films

Haifeng Wang, Wenwu Cao, Q. F. Zhou, K. Kirk Shung, Y. H. Huang

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The quarter-wavelength (λ4) acoustic matching layer, a vital component in medical ultrasonic transducer, can bridge the large acoustic impedance mismatch between the piezoelectric material and the human body. Composite materials are widely used as matching materials in order to cover the wide acoustic impedance range that cannot be accomplished by using a single-phase material. At high frequencies (>50 MHz), the λ4 matching layers become extremely thin so that the fabrication of homogeneous composite material matching layers becomes very challenging. A method is reported in this letter to fabricate sol-gel silicon oxide colloidalpolymer composite film on silicon substrate, in which the particle size of silicon oxide colloidal is between 10 and 40 nm. The acoustic impedance of the nanocomposite films versus aging temperature has been measured at the desired operating frequency.

Original languageEnglish (US)
Pages (from-to)5998-6000
Number of pages3
JournalApplied Physics Letters
Issue number24
StatePublished - Dec 13 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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