Abstract
A new approach for neat powder mid-infrared spectroscopy measurements is described. Powder thin layers are created and supported by wire meshes attached to stainless steel backings, or buttons. Stainless steel buttons are durable, resistant to corrosion, and are easily cleaned and reused. To obtain spectra, buttons containing neat samples are placed at the infrared beam focus of a praying mantis diffuse reflection optical system. Wire diameter and mesh opening size dictate the powder particle size range that can be accommodated and maximum sample layer thicknesses, which determine radiation penetration path lengths. For powder layer thicknesses of several microns, infrared spectra that are free of artifacts can be obtained without dilution in a non-absorbing matrix. Nanogram detection limits are demonstrated for a benzoic acid coating prepared by evaporating an aqueous solution from a button surface.
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