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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 21:10 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Deformed carbon nanotube used as mass sensor
Authors:
Gergely Kósa, Mircea Bercu, V.Grecu
Affiliation:
University of Bucharest, Faculty of Physics, Atomistilor 405, Bucharest –Magurele,
Romania, PO-Box MG-11, RO-77125
E-mail
mircea_bercu@yahoo.com
Keywords:
carbon nanotube, nanoresonator, molecular mass detection, molecular dynamics
Abstract:
Nano-resonators as single walled carbon nanotube (SWCNT) in cantilever or bridge configurations were investigated recently to be used for mass measurements of a few amount of atoms or molecules. This contribution is devoted to the calculation of the changes of mass detection sensitivity due to static strain. A large SWCNT atomistic model of more than 2000 atoms was used to compute the first, the second and the third harmonics. Also their corresponding shifts produced by both the added mass of the attached atoms and by static strain applied to SWCNT, were calculated. The extra-mass is uniformly distributed along the resonator. We found that the strain effects on the first three harmonics are quite different being more effective on the high order of harmonics. We have used an original code developed by us, being based on molecular dynamic theory and using modified Morse potential to describe the interaction between atoms.
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