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Tailored Microcantilever Optimization for Multifrequency Force Microscopy
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DOI：10.1002/advs.202303476.png)
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Abstract
En 中文
Microcantilevers are at the heart of atomic force microscopy (AFM) and play a significant role in AFM-based techniques. Recent advancements in multifrequency AFM require the simultaneous excitation and detection of multiple eigenfrequencies of microcantilevers to assess more data channels to quantify the material properties. However, to achieve higher spatiotemporal resolution there is a need to optimize the structure of microcantilevers. In this study, the architecture of the cantilever with gold nanoparticles using a dip-coating method is modified, aiming to tune the higher eigenmodes of the microcantilever as integer multiples of its fundamental frequency. Through the theoretical methodology and simulative model, that integer harmonics improve the coupling in multifrequency AFM measurements is demonstrated, leading to enhanced image quality and resolution. Furthermore, via the combined theoretical-experimental approach, the interplay between induced mass and stiffness change of the modified cantilever depending on the attached particle location, size, mass, and geometry is found. To validate the results of this predictive model, tapping-mode AFM is utilized and bimodal Amplitude Modulation AFM techniques to examine and quantify the impact of tuning higher-order eigenmodes on the imaging quality of a polystyrene-polymethylmethacrylate (PS-PMMA) block co-polymer assembly deposited on a glass slide and Highly Ordered Pyrolytic Graphite (HOPG). Gold nanoparticles are precisely deposited on a cantilever's surface through integrated drop casting dip-coating approach, adjusting higher eigenmodes to align with integer multiples of the first eigenmode. Through statistical and image analysis methods, it is shown this customized cantilever enhances image quality and resolution during the imaging of block co-polymer PS-PMMA surfaces using AFM tapping mode and bimodal amplitude modulation techniques.image
Keywords:
atomic force microscopy
dip-coating
eigenfrequency
harmonics
microcantilever
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