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Shao, Shaofeng; Koehn, Ralf; Wu, Hongyan; Wu, Tao and Rao, Wei-Feng (2016): Generation of highly ordered nanoporous Sb-SnO2 thin films with enhanced ethanol sensing performance at low temperature. In: New Journal of Chemistry, Vol. 40, No. 6: pp. 5523-5530

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Highly ordered nanoporous Sb-doped tin dioxide (Sb-SnO2) thin films are crystallized by 120 degrees C post-synthetic hydrothermal treatment for gas sensing applications. The resulting thin films can be annealed, as desired, at temperatures of up to 600 degrees C for removing the templates and tuning the sensitivities without destroying the nanostructures. It is found that Sb-SnO2 films doped with 8 wt% Sb can well satisfy the demands for high gas sensitivity at low operation temperature, e.g., a change of similar to 30 times of electric resistance in response to 50 ppm ethanol is rapidly detected at temperatures as low as 100 degrees C. The structure, crystallinity, and composition of the ordered nanoporous Sb-SnO2 thin films are characterized by HRTEM, FESEM, SAED, and STEM. The developed synthesis method represents a flexible route generally applicable for preparing nanoporous metal oxide crystalline films for applications including gas sensing, photocatalysis, and 3rd generation photovoltaics.

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