Tetragonal hausmannite (Mn 3 O 4 ) was synthesized by pulsed-spray evaporation chemical vapor deposition (PSE-CVD) at moderate temperatures. The thermal properties of the obtained Mn 3 O 4 thin films were evaluated with a newly developed in situ emission FTIR method. The performance of Mn 3 O 4 grown on flexible stainless steel mesh substrates was investigated toward the oxidation of CO and C 3 H 6 . X-ray diffraction (XRD) patterns, FTIR, and Raman spectroscopy reveal that only the single-phase tetragonal Mn 3 O 4 spinel structure was obtained within the temperature range of 350− 500 °C. The as-deposited Mn 3 O 4 is thermally stable up to 800 °C, and its reduction plays a determinant role in the catalytic process. Compared to conventional powder catalysts, the combination of PSE-CVD, in situ emission FTIR, and the flexible substrate provides a novel tool for catalyst synthesis and the evaluation of the thermal properties and catalytic performance.

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