Acoustic properties of alumina colloidal/polymer nano-composite film on silicon

Rui Zhang, Wenwu Cao, Qifa Zhou, Jung Hyui Cha, K. Kirk Shung, Yuhong Huang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Alumina colloidal/polymer composite films on silicon substrates have been successfully fabricated using the sol-gel method, in which the crystallite sizes of alumina are between 20 and 50 nm. The density and ultrasonic phase velocities in these films with different alumina ratios from 14% to 32% were measured at the desired operating frequency. We have proved that the density, acoustic phase velocities, and hence the acoustic impedance of the nanocomposite films increase with the alumina content, which gives us another option of tailoring the acoustic impedance of the nano-composite film for making the matching layer of high-frequency medical ultrasonic transducers.

Original languageEnglish (US)
Pages (from-to)467-469
Number of pages3
JournalIEEE transactions on ultrasonics, ferroelectrics, and frequency control
Issue number3
StatePublished - Mar 2007

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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