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Real-time single airborne nanoparticle detection with nanomechanical resonant filter-fiber
Link to Journal Abstract
Nanomechanical resonators have an unprecedented mass sensitivity sufficient to detect single molecules, viruses or nanoparticles. The challenge with nanomechanical mass sensors is the direction of nano-sized samples onto the resonator. In this work we present an efficient inertial sampling technique and gravimetric detection of airborne nanoparticles with a nanomechanical resonant filter-fiber. By increasing the nanoparticle momentum the dominant collection mechanism changes from diffusion to more efficient inertial impaction. In doing so we reach a single filter-fiber collection efficiency of 65 ± 31% for 28 nm silica nanoparticles. Finally, we show the detection of single 100 nm silver nanoparticles. The presented method is suitable for environmental or security applications where low-cost and portable monitors are demanded. It also constitutes a unique technique for the fundamental study of single filter-fiber behavior. We present the direct measurement of diffusive nanoparticle collection on a single filter-fiber qualitatively confirming Langmuir's model from 1942.
In this work the authors present an efficient inertial sampling technique and gravimetric detection of airborne nanoparticles with a nanomechanical resonant filter-fiber. The presented method is suitable for environmental or security applications where low-cost and portable monitors are demanded.
Peer Reviewed Journal Article
Exposure Or Hazard Target
Method Of Study
Material Analysis and Applications
Risk Exposure Group
Scientific Reports, 2013, 3:1288 (5pp)
Schmid S, Kurek M, Adolphsen JQ, Boisen A
Last updated on June 6, 2013
This work is supported in part by the Nanoscale Science and Engineering Initiative of the National Science Foundation
under NSF Award Number EEC-0118007.
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