title: Effects of a magnetic force on surface-enhanced Raman spectra of a cysteamine linking magnetic particle and a silver colloid plate.
abstract: The effects of a magnetic force on magnetic particles linked by cysteamine to a silver colloid plate were analyzed with surface-enhanced Raman scattering spectroscopy. Cysteamine molecules were stretched by a force exerted on the magnetic particles with the external magnetic field gradients generated by two Nd-Fe-B magnets. The spectra showed that the relative intensity ratio of C-S (trans) to C-S (gauche) of cysteamine was increased 2 - 3 times within 30 min under the application of magnetic field gradients. Also, the shift of C-S (T) was observed up to 4 cm(-1) to higher frequency. These results suggested that an extension of the distance between a magnetic particle and a silver colloid induced isomerization from the gauche conformation to the trans conformation, accompanied by probable thiolate migration on the silver colloid surface.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan.
authors.forename: Takeyoshi
authors.initials: T
authors.lastname: Goto
authors.forename: Shigeki
authors.initials: S
authors.lastname: Yamamoto
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Watarai