Observation of Self-Assembled Monolayer Using the Lateral Resonance of the Cantilever in the Contact and Noncontact Regions

概要

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A new imaging method utilizing the lateral resonance vibration of a cantilever in atomic force microscopy was applied to evaluate microcontact printed patterns of self-assembled monolayers. The lateral resonance vibration of a cantilever was excited by the feedback of the torsional signal detected optically to a shear piezo set at the base of the cantilever. The amplitude and frequency shift of the vibration were mapped as images in air and in vacuum. The phase-separated patterns of octadecanethiol and 16-mercaptohexadecanoic acid on gold substrates were observed in air using a contact-mode cantilever and -CH3-terminated cantilever, respectively. In most cases, amplitude mapping showed a similar contrast to friction force microscopy but with a better lateral resolution and contrast. In the case where the vibration amplitude was smaller than 3 nm, adhesive force was dominant on the image contrast. The observation using a noncontact-mode cantilever in vacuum gave a good contrast, where the tip-sample distance was controlled by maintaining a set lateral amplitude.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-07-15