Higher modes of vibration increase mass sensitivity in nanomechanical microcantilevers

Ghatkesar, Murali Krishna and Barwich, Viola and Braun, Thomas and Ramseyer, Jean-Pierre and Gerber, Christoph and Hegner, Martin and Lang, Hans Peter and Drechsler, Ute and Despont, Michel. (2007) Higher modes of vibration increase mass sensitivity in nanomechanical microcantilevers. Nanotechnology, 18 (44). p. 445502.

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Official URL: https://edoc.unibas.ch/83881/

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We evaluated the potential and limitations of resonating nanomechanical microcantilevers for the detection of mass adsorption. As a test system we used mass addition of gold layers of varying thickness. Our main findings are: (1) A linear increase in mass sensitivity with the square of the mode number-a sensitivity increase of two orders of magnitude is obtained from mode 1 to mode 7 with a minimum sensitivity of 8.6 ag Hz(-1) mu m(-2) and mass resolution of 0.43 pg at mode 7 for a 1 mu m thick cantilever. (2) The quality factor increases with the mode number, thus helping to achieve a higher sensitivity. (3) The effective spring constant of the cantilever remains constant for deposition of gold layers up to at least 4% of the cantilever thickness.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Structural Biology & Biophysics > Structural Biology (Braun)
UniBasel Contributors:Braun, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Oct 2021 12:21
Deposited On:06 Oct 2021 12:21

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