Metal oxide nanoparticles are of great importance due to their unique size- and shape-dependent optical, magnetic, electronic and chemical properties. Herein we report a novel biological approach to synthesize iron oxyhydroxide nanoparticles (2-6 nm). The general morphology of nanoparticles as well as the electronic structure of a single nanoparticle on Au(111) were characterized with a combination of Atomic Force Microscopy (AFM), Scanning Tunneling Microscopy (STM) and Scanning Tunneling Spectroscopy (STS). The chemical reactivity towards SO2 adsorption of FeOOH nanoparticles were examined using Attenuated Total Reflection Infrared Spectroscopy (ATR-IR). The size dependent properties, e.g,, the band gap energy and geometrical structure, on the chemical performance of FeOOH nanoparticles are discussed.
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