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Zeptogram sensing from gigahertz vibration: Graphene based nanosensor

Adhikari, S. ; Chowdhury, R.

Physica. E, Low-dimensional systems & nanostructures, 2012-04, Vol.44 (7-8), p.1528-1534 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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Título:
Zeptogram sensing from gigahertz vibration: Graphene based nanosensor
Autor: Adhikari, S. ; Chowdhury, R.
Assuntos: Condensed matter: structure, mechanical and thermal properties ; Cross-disciplinary physics: materials science; rheology ; Exact sciences and technology ; Fullerenes and related materials; diamonds, graphite ; General equipment and techniques ; Instruments, apparatus, components and techniques common to several branches of physics and astronomy ; Lattice dynamics ; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties ; Materials science ; Phonons in low-dimensional structures and small particles ; Physics ; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing ; Specific materials ; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)
É parte de: Physica. E, Low-dimensional systems & nanostructures, 2012-04, Vol.44 (7-8), p.1528-1534
Descrição: We develop the mathematical framework for using single layer graphene sheet as nanoscale label-free mass sensors. Graphene resonators are assumed to be in the cantilevered configuration. Four types of mass loadings are considered and closed-form equations are derived for the frequency shift due to the added mass. Using the potential and kinetic energy of the mass loaded graphene sheets, generalised non-dimensional calibration constants are proposed for an explicit relationship between the added mass and the frequency shift. These equations in turn are used for sensing the added mass. Numerical results illustrate that the sensitivity of graphene sensors is in the order of gigahertz/zeptogram. We show that the performance of the sensor depends on the spatial distribution of the attached mass on the graphene sheet. ► Single layer graphene sheets are considered as label-free nanomass sensors. ► Frequency shift due to the added mass is used for sensing. ► Closed-form equations are derived to detect mass from the frequency shift. ► Four types of mass distributions are considered. ► Results are validated using atomistic simulations.
Editor: Amsterdam: Elsevier B.V
Idioma: Inglês

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Zeptogram sensing from gigahertz vibration: Graphene based nanosensor

Adhikari, S. ; Chowdhury, R.

Amsterdam: Elsevier B.V

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