AFM probe with the U-shaped cross-sectional cantilever for measuring the ultra-low coefficient of friction of 10-6

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外文摘要：Accurately measuring the coefficient of friction(COF)is the fundamental prerequisite of superlubricity research.This study aimed to reduce the COF measurement resolution Δμ of atomic force microscopy(AFM).Based on the theoretical model,a distinctive strategy was adopted to reduce Δμ by optimizing the cantilever's cross-section of the AFM probe,inspired by civil engineering.Δμ can be reduced by decreasing the width of the horizontal side wR and the wall thickness t and increasing the width of the vertical side wH.Moreover,the I-shape demonstrates the highest reduction in Δμ,followed by the U-shape.Considering the processability,the AFM probe with the U-shaped cross-sectional cantilever was investigated further,and the dimensions are 35 μm wR,3.5 μm wH,0.5 μm t,50 μm l(cantilever length),and 23 μm htip(tip height).The finite element analysis results confirm its reliability.After being fabricated and calibrated,the AFM probe achieves the minimal Δμ of 1.9×10-6 under the maximum normal force so far.Additionally,the friction detection capability of the fabricated AFM probe improves by 78 times compared to the commercial tipless-force modulation mode(TL-FM)AFM probe with the conventional solid rectangular cross-sectional cantilever.This study provides a powerful tool for measuring 10-6 COF.

外文关键词：

atomic force microscopysuperlubricitycoefficient of frictionprobecantilever

作者：

Yushan CHEN、Liang JIANG、Linmao QIAN

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作者单位：

Tribology Research Institute,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China

基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

2020YFA0711001519754885199137352235004

出版年：

2024

DOI：

10.1007/s40544-023-0821-z

摩擦(英文)

CSTPCDEI

ISSN：2223-7690

年,卷(期)：2024.12(8)

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