Abstract
Electronic control of Fe nanoparticles can provide a great opportunity to manipulate their magnetic properties and improve their catalytic activity. Herein, superparamagnetic Fe nanoclusters with Pt2+ doping are synthesized on a variety of semiconductor nitrides, oxides and silicon. Compared to the intrinsic Fe nanoclusters, the as-synthesized Pt-doped Fe nanoclusters exhibit ultrasmall size with a very low saturation magnetization (2.0 emu g−1) and high electron delocalization. The incorporation of Pt2+ dopants also leads to the successful formation of a large Schottky barrier at the iron/semiconductor interface and renders semiconductor a powerful electron donor for Fe active sites under photo irradiation. Photoluminescence spectroscopy and transient photocurrent responses indicate that the formed Schottky barrier can significantly promote the separation of photogenerated charge carriers. Mott-Schottky photocatalysts with enhanced back donation ability provides an efficient pathway to promote NN bond cleavage and produce ammonia with H2 at room temperature by visible light.
Published Version
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