Study on the noise of silicon capacitive resonant mass sensors in ambient atmosphere

Sang Jin Kim, Takahito Ono, Masayoshi Esashi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

This article reports on the resolution of mass detection by optical and capacitive methods in ambient atmosphere using very thin single-crystalline silicon microcantilevers. The detectable minimum mass by optical sensing increases slightly with decreasing cantilever size due to temperature fluctuation noise. Using capacitive detection, a detectable minimum mass of below 1× 10-14 g can be obtained using cantilevers with resonance frequencies of 78-80 kHz. From an experimental comparison, we find that the detectable minimum mass by capacitive detection is slightly smaller than that obtained by optical detection using a cantilever with resonant frequency of 78 kHz. Using theoretical modeling and experimental results relevant to gas adsorption-desorption to the sensor surface, it is found that the adsorption-desorption noise by gases with infinitesimal partial pressure in the air surrounding a cantilever significantly influences the resonance frequency fluctuation of the cantilever in the high resonance frequency region.

Original languageEnglish
Article number104304
JournalJournal of Applied Physics
Volume102
Issue number10
DOIs
Publication statusPublished - 2007 Dec 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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