| Abstract
| - Highly organized and crystallized cubic and hexagonal mesoporous SnO2 thin films were selectively synthesizedvia an evaporation-induced self-assembly (EISA) process with SnCl4 as the precursor and a triblock copolymer(pluronic F127) as the template. The as-spin-coated films were treated in two separate aging steps. Initialaging in a relative humidity (RH) of 75−85% at 25 °C was essential for obtaining the transparent and highlyorganized mesoporous films. The introduction of 1-BuOH instead of EtOH in the Sn−sol solution inducedthe formation of a robust hexagonal mesophase. X-ray diffraction, transmission electron microscopy, scanningelectron microscopy, and UV−visible spectroscopy revealed the mesopore structures of the SnO2 thin filmsto be periodically organized with uniform surfaces, highly crystallized in the cassiterite phase, and thermallystable up to 600 °C. The optical transparencies were greater than 97% in the visible-light range. The sheetresistances of the prepared cubic and hexagonal mesoporous SnO2 thin films were also analyzed.
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