Development of a reliable probes <b>
                     <i>in situ</i>
                  </b> linear exchange module based on an environment control atomic force microscope

In this work, a high-precision atomic force microscope (AFM) probes rotary exchange module was developed. The module is capable of installing up to eight AFM probes simultaneously. It can achieve in situ rotary exchange of different AFM probes inside the AFM chamber with as high as 3 μrad rotation precision by program control. As a result, different measurements in the designated environments can be continuously conducted as required without introducing contaminants from outside. The reliability and function of the module were experimentally validated through surface topography scanning and wear tests. The module can serve as a useful tool for studying nanotribology.

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A high-precision eight-AFM probe rotary exchange module

Lin

Jiang

Chen

et al. 2019

Review of Scientific Instruments

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Scanning probe microscope probe switching unit with electrical measurement for in situ multifunctional characterization: Design and preliminary application in tribocorrosion investigation

Chen

Jiang

et al. 2022

Journal of Applied Physics

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Scanning probe microscope (SPM) is a potent tool in nanotribology research. However, commercial environment control SPMs can install only one probe to perform one function at a time. Accordingly, this study developed a probe switching unit with electrical measurement for in situ multifunctional characterization. The unit mainly comprises a cover, a rotation stage, and a probe holder assembly. Four probes can be installed. One is electrically connected to perform tapping mode and electrical measurement such as Kelvin probe force microscope (0.01 mV resolution), while the other three are to perform contact mode. The rotation stage drives the assembly to switch probes to in situ measure multiple physical quantities in a controlled environment. The unit was preliminarily applied to investigate tantalum tribocorrosion. Based on the changing trends of wear amount and surface potential change, the wear process can be roughly divided into three stages, which may be caused by desorption of the adsorbed air, wear of the oxide film, and wear of the substrate, respectively. Moreover, wear can lead to a surface potential increment, which may partly contribute to the galvanic corrosion between the virgin area and the wear area. The unit may serve as a useful tool for nanotribology research.

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Development of a bending-stress-controllable micro-clamp and applications in nanowear study of polyimide terephthalate

Wang

Tang

Liu

et al. 2022

Review of Scientific Instruments

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Inner stress that exists in most natural and artificial materials, such as rocks, coatings, glasses, and plastic products, has a significant impact on their tribological properties at any length scale. Here, we designed a bending-stress controllable micro-clamp that can be applied in a high-vacuum atomic force microscope with limited chamber space for the investigation of stress-dependent nanowear behavior. By accurately quantifying the bending degree of the sample in different directions, the mutual transformation and adjustment of tensile or compressive stress could be realized. The stability of the micro-clamp structure was further verified by simulating the bending deformation state of the sample through Ansys calculations. The maximum applied scratch area on the bended sample surface where the variation of bending-induced stress below 5% was defined by the Ansys simulations. The consistency of polyimide terephthalate (PET) wear inside this defined region under both bending-free and bending states verified the stability and reliability of micro-clamp. Finally, the designed micro-clamp was applied to study the effect of bending deformation on friction and wear of PET in the atomic force microscope tests, where the tensile stress generated with bending deformation was found to facilitate the nanowear of PET material sliding against a diamond probe.

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Development of a reliable probes in situ linear exchange module based on an environment control atomic force microscope

Cited by 3 publications

References 4 publications

A high-precision eight-AFM probe rotary exchange module

A high-precision eight-AFM probe rotary exchange module

Scanning probe microscope probe switching unit with electrical measurement for in situ multifunctional characterization: Design and preliminary application in tribocorrosion investigation

Development of a bending-stress-controllable micro-clamp and applications in nanowear study of polyimide terephthalate

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