In order to apply biomolecular functionalities to the modern nanotechnology such as energy conversion and sensors, it is necessary for practical use to extract response against external stimulations as an electrical signal, and is important to introduce biomolecules to semiconductor integrated circuits and to control those sequences. Silicon is one of the most fundamental and important semiconductor materials. Thus, construction of molecular layers on silicon surface may be a step of creating molecular device with a high efficiency. Because self-assembled monolayer (SAM) has high density and high-orientation structure of monolayer, moreover, this is applicable to construct the molecular devices. In this report, two kinds of ester terminated SAMs such as methyl acrylate and ethyl undecylenate SAMs were constructed on Si(111) surface and the properties of these SAMs were investigated by attenuated total reflection - Fourier transformed infrared spectroscopy (ATR-FTIR) and contact angle measurements.After etching two prisms of n-typed Si(111), methyl acrylate and ethyl undecylenate SAMs were prepared on Si(111) by dipping each Si prism into methyl acrylate and ethyl undecylenate, respectively, and then irradiating UV light (254 nm, 22.0 W) under N2 atmosphere for several hours. After rinsing them with several kinds of solutions, ex situ ATR-FTIR spectra and contact angles with ultrapure water were measured.Based on the experimental results, we found that the two kinds of SAMs were well-constructed on the Si(111) surface and the ethyl undecylenate SAM had higher density and higher orientation than the methyl acrylate SAM. We also found that C-O single bond of the ethyl undecylenate SAM was oriented more vertical to the Si(111) surface than that of methyl acrylate SAM.

Construction and structural analyses of carboxylate terminated self-assembled monolayers on Si(111)

248th National Meeting (2014)

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