Nano Archive

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).

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Official URL: http://www.iop.org/EJ/abstract/-search=66089878.1/...

Abstract

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.

Item Type:Article
Uncontrolled Keywords:FORCE MICROSCOPE CANTILEVER; NANOELECTROMECHANICAL SYSTEMS; SENSORS; OSCILLATORS; FREQUENCY; READOUT; GROWTH; ARRAY
Subjects:Analytical Science > Nanotechnology for sensing and actuating
ID Code:6443
Deposited By:IoN
Deposited On:24 Sep 2009 11:07
Last Modified:24 Sep 2009 11:07

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