Insituforce calibration of high force constant atomic force microscope cantilevers
作者:
D. Scholl,
M. P. Everson,
R. C. Jaklevic,
期刊:
Review of Scientific Instruments
(AIP Available online 1994)
卷期:
Volume 65,
issue 7
页码: 2255-2257
ISSN:0034-6748
年代: 1994
DOI:10.1063/1.1144737
出版商: AIP
数据来源: AIP
摘要:
A miniature capacitive force sensor which fits in the sample position of an atomic force microscope (AFM) has been used to calibrate the force applied by the scanning tip during nanohardness measurements. The sensor is simple, physically robust, and easily fabricated from readily available materials. It can be operated with commonly available electronic instrumentation. The device described here is optimized for tip‐sample forces between 10−4and 10−2N, a range useful for micrometer‐scale mechanical modification of surfaces. With minor design changes, sensors of this general type should be capable of much greater sensitivity. The sensor is calibrated outside the AFM by the application of free weights. Calculated estimates of AFM cantilever force constants are difficult for all but the simplest geometries and may rely on uncertain values for certain critical dimensions and material properties. These estimates can thereby be replaced by a simple and direct measurement.
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