Frequency response of atomic force microscope cantilever driven by fluid

Volkov, A. O.; Burnell-Gray, J. S.; Datta, P. K.

doi:10.1063/1.1828581

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…A potential candidate for this force is the unsteady motion of the liquid in the cell, which in turn is generated by the vibrating piezo. Such a fluid forcing has been postulated by several authors before [13,14,22,15]. We will refer to this excitation as 'fluid-borne excitation', in contrast to the mechanical excitation of the cantilever base, which will be referred to as 'structure-borne excitation'.…”

Section: The Fluid-borne Excitation Forcementioning

confidence: 95%

Quantitative force and dissipation measurements in liquids using piezo-excited atomic force microscopy: a unifying theory

Kiracofe

Raman

2011

Nanotechnology

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The use of a piezoelectric element (acoustic excitation) to vibrate the base of microcantilevers is a popular method for dynamic atomic force microscopy. In air or vacuum, the base motion is so small (relative to tip motion) that it can be neglected. However, in liquid environments the base motion can be large and cannot be neglected. Yet it cannot be directly observed in most AFMs. Therefore, in liquids, quantitative force and energy dissipation spectroscopy with acoustic AFM relies on theoretical formulae and models to estimate the magnitude of the base motion. However, such formulae can be inaccurate due to several effects. For example, a significant component of the piezo excitation does not mechanically excite the cantilever but rather transmits acoustic waves through the surrounding liquid, which in turn indirectly excites the cantilever. Moreover, resonances of the piezo, chip and holder can obscure the true cantilever dynamics even in well-designed liquid cells. Although some groups have tried to overcome these limitations (either by theory modification or better design of piezos and liquid cells), it is generally accepted that acoustic excitation is unsuitable for quantitative force and dissipation spectroscopy in liquids. In this paper the authors present a careful study of the base motion and excitation forces and propose a method by which quantitative analysis is in fact possible, thus opening this popular method for quantitative force and dissipation spectroscopy using dynamic AFM in liquids. This method is validated by experiments in water on mica using a scanning laser Doppler vibrometer, which can measure the actual base motion. Finally, the method is demonstrated by using small-amplitude dynamic AFM to extract the force gradients and dissipation on solvation shells of octamethylcyclotetrasiloxane (OMCTS) molecules on mica.

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Section: The Fluid-borne Excitation Forcementioning

confidence: 95%

Quantitative force and dissipation measurements in liquids using piezo-excited atomic force microscopy: a unifying theory

Kiracofe

Raman

2011

Nanotechnology

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“…In order to properly put the cantilever of an atomic force microscope working in the dynamic mode into motion, a variety of excitation techniques has been used. 15 The acoustic excitation supplied by a piezoactuator is the most widespread for dynamic AFM in air and vacuum. In viscous liquid media, the cantilever can essentially be driven by thermal noise, 10,11 by a piezoelectric actuator [7][8][9] or magnetically by either attaching a magnetic particle to the cantilever 12 or coating the cantilever.…”

Section: Improved Acoustic Excitation Of Atomic Force Microscope Cantmentioning

confidence: 99%

Improved acoustic excitation of atomic force microscope cantilevers in liquids

Maali

Hurth

Cohen–Bouhacina

et al. 2006

Applied Physics Letters

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“…14 Recently, several experiments and simulations have pointed out the existence of remarkable differences in the dynamic behavior of AFM microcantilevers in liquids depending on the excitation mode. [15][16][17][18][19] Experiments performed by Volkov et al 16 showed that the resonance curve of a fluiddriven cantilever tends at high frequencies to a finite value of the oscillation amplitude. This is at variance with the observed behavior of magnetically excited cantilevers that show resonance curves with negligible oscillation amplitudes at high frequencies 10,13 ͓see also Figs.…”

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confidence: 99%

Frequency response of an atomic force microscope in liquids and air: Magnetic versus acoustic excitation

Herruzo¹,

García²

2007

Applied Physics Letters

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We discuss the dynamics of an amplitude modulation atomic force microscope in different environments such as water and air. Experiments, analytical expressions, and numerical simulations show that the resonance curves depend on the excitation method used to drive the cantilever, either mechanical or magnetic. This dependence is magnified for small force constants and quality factors, i.e., below 1 N / m and 10, respectively. We show that the equation for the observable, the cantilever deflection, depends on the excitation method. Under mechanical excitation, the deflection involves the base and tip displacements, while in magnetic excitation, the cantilever deflection and tip displacement coincide.

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Frequency response of atomic force microscope cantilever driven by fluid

Cited by 8 publications

References 19 publications

Quantitative force and dissipation measurements in liquids using piezo-excited atomic force microscopy: a unifying theory

Quantitative force and dissipation measurements in liquids using piezo-excited atomic force microscopy: a unifying theory

Improved acoustic excitation of atomic force microscope cantilevers in liquids

Frequency response of an atomic force microscope in liquids and air: Magnetic versus acoustic excitation

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