Subharmonic excitation in amplitude modulation atomic force microscopy in the presence of adsorbed water layers

Santos, Sergio; Barcons, Victor; Verdaguer, Albert; Chiesa, Matteo

doi:doi:10.1063/1.3663437

Volume/Page
Keyword
DOI
Citation
Advanced

Volume: Page/Article:

Search Content Type

article doi:

Citation:

Analytical and experimental study on the fluid structure interaction during air blast loading

A new fluid-structure interaction model that considers high gas compressibility is developed using the Rankine–Hugoniot relations. The impulse conservation between the gas and structure is utilized to determine the reflected pressure profile from the known incident pressure profile. The physical parameters of the gas such as the shock front velocity, gas density, local sound velocity, and gas particle velocity as well as the impulse transmitted onto the structure are also evaluated. A series of...

About the internal pressure in cavities derived from implantation-induced blistering in semi-conductors

Silicon and germanium wafers were implanted with hydrogen at high fluence and then submitted to thermal treatment at low temperature. By means of atomic force microscopy observations and finite elements simulations, the internal pressure under the resulting blisters appearing onto the surface has been determined. It is found that the internal pressure could be strongly overestimated from calculation if the internal compressive stresses in the implanted layers are neglected and/or incorrect boun...

In ambient conditions, nanometric water layers form on hydrophilic surfaces covering them and significantly changing their properties and characteristics. Here we report the excitation of subharmonics in amplitude modulation atomic force microscopy induced by intermittent water contacts. Our simulations show that there are several regimes of operation depending on whether there is perturbation of water layers. Single period orbitals, where subharmonics are never induced, follow only when the tip is either in permanent contact with the water layers or in pure noncontact where the water layers are never perturbed. When the water layers are perturbed subharmonic excitation increases with decreasing oscillation amplitude. We derive an analytical expression which establishes whether water perturbations compromise harmonic motion and show that the predictions are in agreement with numerical simulations. Empirical validation of our interpretation is provided by the observation of a range of values for apparent height of water layers when subharmonic excitation is predicted.

Article Outline

INTRODUCTION
MODEL AND METHODS
RESULTS AND DISCUSSION
1. The analytic expression for stability and its consequences
2. Subharmonics and limit cycles
3. Consequences for apparent height
CONCLUSION

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

adsorbed layers, amplitude modulation, atomic force microscopy, harmonic oscillators, hydrophilicity, numerical analysis, water

PACS

68.37.Ps

Atomic force microscopy (AFM)
82.53.St

Femtochemistry of adsorbed molecules
02.60.-x

Numerical approximation and analysis
03.65.Ge

Solutions of wave equations: bound states
68.08.Bc

Wetting

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3663437

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

For access to citing articles, you need to log in.

Figures (8)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)