Molybdenum oxide thin films were deposited on stiff and flexible substrates by reactive DC magnetron sputtering. Two sets of samples were prepared. The first with different O<sub>2</sub>/Ar flow rate ratios and the second, fixing the oxygen content, with different time of deposition. As the O<sub>2</sub>/Ar flow rate ratio varies from 0 up to 0.56, a threshold was found, ranging from crystalline to amorphous na...