In order to investigate interactions of polyoxometalates (POMs) with aminosilane gradients on silica, a new technique using evanescent �wave cavity ring-down spectroscopy (EW-CRS) was applied. This method involves moving a prism in the vertical and horizontal direction, with respect to light in an optical cavity, as the ring-down times of light in the cavity are recorded.  To show that high-contrast images can be obtained, an image of a cm-sized dot of n-propylaminotrimethoxysilane on the face of the prism was acquired.  The successful proof of principal in obtaining detailed images of these samples on a silica surface demonstrates the ability of this technique to view spatially dependent images, such as the interaction of a vapor or solution with a chemical gradient on a solid substrate.

Spatially dependent evanescent-wave cavity ring-down spectroscopy

243rd National Meeting (2012)

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