Surface‐enhanced Raman scattering of 4‐mercaptopyridine on sub‐monolayers of α‐Fe<sub>2</sub>O<sub>3</sub> nanocrystals (sphere, spindle, cube)

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<jats:title>Abstract</jats:title><jats:p>We report surface‐enhanced Raman scattering (SERS) spectra from 4‐mercaptopyridine (4‐Mpy) adsorbed on sub‐monolayers of α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> nanocrystals (sphere, spindle, cube). The maximum enhancement factor has been estimated to be about 10<jats:sup>4</jats:sup> compared to that of 4‐Mpy in solution. A possible mechanism has been proposed that the charge transfer between the α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> nanocrystals and the 4‐Mpy molecules is most likely responsible for the observed enhancement of Raman intensity of adsorbed 4‐Mpy molecules as surface plasmon resonances have not occurred. Copyright © 2009 John Wiley & Sons, Ltd.</jats:p>

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