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The placement of clean or specific thiol-coated gold surfaces in solutions of Fe III that are below supersaturation results in the growth of thin films of lepidocrocite g-FeO(OH) at room temperature. The use of gold substrates has allowed a variety of characterization techniques to be employed to monitor changes on the surface. Surface plasmon spectroscopy reveals the specific preference of the growing material for sulfonate-terminated surfaces, although high yields are also obtained on clean gold substrates. Mössbauer spectroscopy reveals that the deposited material displays particle size effects. The morphology of the g-FeO(OH) particles formed on the surface has been detailed through atomic force microscopic investigations.

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We present the use of self-assembled monolayers of Zr-phosphonate multilayers (bilayers in terms of metal atoms) as substrates for the heterogeneous nucleation of hematite under hydrothermal conditions. The phosphonate multilayers display high (hydro)thermal stability which we establish beforehand. The films of the hematite nanoparticles have been characterised using techniques including atomic force microscopy and Mo ¨ssbauer spectroscopy in reflection. This latter technique shows up the effect of the small particle sizes of the hematite particles on the nature of the magnetic ordering.surface plasmon spectroscopy (SPS ). We shall then use hydro-

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