Abstract
A simple hydrothermal process is proposed for synthesizingSnO2 quantum dots (QDs), in which hydrazine hydrate is used as the mineralizer insteadof NaOH. X-ray diffraction, high-resolution transmission electron microscopy(HRTEM) and UV–vis diffuse reflectance spectroscopy (DRS) were employed tocharacterize the product. The HRTEM image shows that the diameters of theSnO2 nanoparticles fall into a small range of 2.3–3.1 nm, with the majority being less than the exciton Bohrradius of SnO2 (∼2.7 nm). Analysis of the DRS spectrum showed the band gap of theSnO2 QDs to be 3.88 eV, exhibiting a 0.28 eV blue shift from that of the bulkSnO2 (3.6 eV). The mechanism for hydrothermal synthesis of theSnO2 QDs using hydrazine hydrate as the mineralizer is discussed.
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