A novel, highly crystalline indium germinate hybrid sub-nanowire, which we denote as In2Ge2O7(En) (En = ethylenediamine), with general diameters of 2–3 nm and lengths up to hundreds of nanometres was synthesized using a solvothermal route in a binary En/water solvent system. The hybrid ultrathin nanowire exhibits an ultraviolet photoluminescence emission, a dramatic blue shift by more than 100 nm relative to pure inorganic In2Ge2O7 nanowire and microtubes. The In2Ge2O7(En) ultrathin nanowire performs selectively the photocatalytic reduction of carbon dioxide (CO2) into carbon monoxide (CO) in the presence of water vapor. With reference to our Zn2GeO4 nanoribbon photocatalyst, which was recently used to produce CH4 under the same photocatalytic conditions, this work is a significant sign that the greenhouse gas, CO2, can be ameliorated into desirable kinds of renewable fuels using different germanate catalysts.
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