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Title: Comparison of different methods to calibrate torsional spring constant and photodetector for atomic force microscopy friction measurements in air and liquid

Abstract

A number of atomic force microscopy cantilevers have been exhaustively calibrated by a number of techniques to obtain both normal and frictional force constants to evaluate the relative accuracy of the different methods. These were of either direct or indirect character--the latter relies on cantilever resonant frequencies. The so-called Sader [Rev. Sci. Instrum. 70, 3967 (1999)] and Cleveland [Rev. Sci. Instrum. 64, 403 (1993)] techniques are compared for the normal force constant calibration and while agreement was good, a systematic difference was observed. For the torsional force constants, all the techniques displayed a certain scatter but the agreement was highly encouraging. By far the simplest technique is that of Sader, and it is suggested in view of this validation that this method should be generally adopted. The issue of the photodetector calibration is also addressed since this is necessary to obtain the cantilever twist from which the torsional force is calculated. Here a technique of obtaining the torsional photodetector sensitivity by combining the direct and indirect methods is proposed. Direct calibration measurements were conducted in liquid as well as air, and a conversion factor was obtained showing that quantitative friction measurements in liquid are equally feasible provided the correct calibrationmore » is performed.« less

Authors:
; ; ;  [1]
  1. Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Drottning Kristinas Vaeg 51, SE-100 44 Stockholm (Sweden)
Publication Date:
OSTI Identifier:
21024284
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 78; Journal Issue: 9; Other Information: DOI: 10.1063/1.2779215; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; AIR; ATOMIC FORCE MICROSCOPY; CALIBRATION; COMPARATIVE EVALUATIONS; FRICTION; LIQUIDS; PHOTODETECTORS; SENSITIVITY; SPRINGS; VALIDATION

Citation Formats

Pettersson, Torbjoern, Nordgren, Niklas, Rutland, Mark W, Feiler, Adam, and Department of Physical and Analytical Chemistry, Surface Biotechnology, Uppsala University, P.O. Box 577, SE-751 23 Uppsala. Comparison of different methods to calibrate torsional spring constant and photodetector for atomic force microscopy friction measurements in air and liquid. United States: N. p., 2007. Web. doi:10.1063/1.2779215.
Pettersson, Torbjoern, Nordgren, Niklas, Rutland, Mark W, Feiler, Adam, & Department of Physical and Analytical Chemistry, Surface Biotechnology, Uppsala University, P.O. Box 577, SE-751 23 Uppsala. Comparison of different methods to calibrate torsional spring constant and photodetector for atomic force microscopy friction measurements in air and liquid. United States. https://doi.org/10.1063/1.2779215
Pettersson, Torbjoern, Nordgren, Niklas, Rutland, Mark W, Feiler, Adam, and Department of Physical and Analytical Chemistry, Surface Biotechnology, Uppsala University, P.O. Box 577, SE-751 23 Uppsala. 2007. "Comparison of different methods to calibrate torsional spring constant and photodetector for atomic force microscopy friction measurements in air and liquid". United States. https://doi.org/10.1063/1.2779215.
@article{osti_21024284,
title = {Comparison of different methods to calibrate torsional spring constant and photodetector for atomic force microscopy friction measurements in air and liquid},
author = {Pettersson, Torbjoern and Nordgren, Niklas and Rutland, Mark W and Feiler, Adam and Department of Physical and Analytical Chemistry, Surface Biotechnology, Uppsala University, P.O. Box 577, SE-751 23 Uppsala},
abstractNote = {A number of atomic force microscopy cantilevers have been exhaustively calibrated by a number of techniques to obtain both normal and frictional force constants to evaluate the relative accuracy of the different methods. These were of either direct or indirect character--the latter relies on cantilever resonant frequencies. The so-called Sader [Rev. Sci. Instrum. 70, 3967 (1999)] and Cleveland [Rev. Sci. Instrum. 64, 403 (1993)] techniques are compared for the normal force constant calibration and while agreement was good, a systematic difference was observed. For the torsional force constants, all the techniques displayed a certain scatter but the agreement was highly encouraging. By far the simplest technique is that of Sader, and it is suggested in view of this validation that this method should be generally adopted. The issue of the photodetector calibration is also addressed since this is necessary to obtain the cantilever twist from which the torsional force is calculated. Here a technique of obtaining the torsional photodetector sensitivity by combining the direct and indirect methods is proposed. Direct calibration measurements were conducted in liquid as well as air, and a conversion factor was obtained showing that quantitative friction measurements in liquid are equally feasible provided the correct calibration is performed.},
doi = {10.1063/1.2779215},
url = {https://www.osti.gov/biblio/21024284}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 9,
volume = 78,
place = {United States},
year = {Sat Sep 15 00:00:00 EDT 2007},
month = {Sat Sep 15 00:00:00 EDT 2007}
}