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Surface Adsorbate Fluctuations and Noise in Nanoelectromechanical Systems

Yang, Y. T. and Callegari, C. and Feng, X. L. and Roukes, M. L. (2011) Surface Adsorbate Fluctuations and Noise in Nanoelectromechanical Systems. Nano Letters, 11 (4). pp. 1753-1759. ISSN 1530-6984. PMCID PMC3839310. doi:10.1021/nl2003158.

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Physisorption on solid surfaces is important in both fundamental studies and technology. Adsorbates can also be critical for the performance of miniature electromechanical resonators and sensors. Advances in resonant nanoelectromechanical systems (NEMS), particularly mass sensitivity attaining the single-molecule level, make it possible to probe surface physics in a new regime, where a small number of adatoms cause a detectable frequency shift in a high quality factor (Q) NEMS resonator, and adsorbate fluctuations result in resonance frequency noise. Here we report measurements and analysis of the kinetics and fluctuations of physisorbed xenon (Xe) atoms on a high-Q NEMS resonator vibrating at 190.5 MHz. The measured adsorption spectrum and frequency noise, combined with analytic modeling of surface diffusion and adsorption−desorption processes, suggest that diffusion dominates the observed excess noise. This study also reveals new power laws of frequency noise induced by diffusion, which could be important in other low-dimensional nanoscale systems.

Item Type:Article
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URLURL TypeDescription CentralArticle
Roukes, M. L.0000-0002-2916-6026
Additional Information:© 2011 American Chemical Society. Received: January 27, 2011; Published: March 09, 2011. We thank S. Stryker for help in engineering the experimental apparatus. We thank C.A. Zorman and M. Mehregany for custom-made high-quality thin SiC layers. X.L.F. is grateful to M. C. Cross and L. G. Villanueva for helpful discussions, and to Y. Wu for help with the illustrations. We acknowledge the support from DARPA/MTO and SPAWAR under the Grant N66001-02-1-8914.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Space and Naval Warfare Systems Command (SPAWAR)N66001-02-1-8914
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Subject Keywords:Nanoelectromechanical systems (NEMS); surface adsorbate; adsorption-desorption; diffusion; resonator; noise
Issue or Number:4
PubMed Central ID:PMC3839310
Record Number:CaltechAUTHORS:20110504-113312909
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Official Citation:Surface Adsorbate Fluctuations and Noise in Nanoelectromechanical Systems Y. T. Yang, C. Callegari, X. L. Feng, M. L. Roukes Nano Letters 2011 11 (4), 1753-1759
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23549
Deposited On:05 May 2011 15:11
Last Modified:09 Nov 2021 16:15

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