Ultrasensitive quartz crystal microbalance with porous gold electrodes

Mitsunori Hieda, Rafael Garcia, Matt Dixon, Tad Daniel, David Allara, M. H.W. Chan

Research output: Contribution to journalArticlepeer-review

118 Scopus citations


The sensitivity enhancement of the quartz crystal microbalance (QCM) was studied by replacing conventional electrode with porous gold (Au) electrodes. The QCM is a thin AT-cut quartz disk that oscillates in the shear mode when a voltage is applied across the electrodes. The total thickness of the porous gold electrodes was estimated to be 1.6 μm from the frequency decrease of 226 kHz upon sputtering silver (Ag)-Au. The sensitivity of the QCM was enhanced by a factor of 40 and by increasing the thickness of the electrodes, it is possible to increase the sensitivity by another factor of 2 or 3.

Original languageEnglish (US)
Pages (from-to)628-630
Number of pages3
JournalApplied Physics Letters
Issue number4
StatePublished - Jan 26 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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