| Summary: | In this study, CoFe<sub>2</sub>O<sub>4</sub> is selected for the first time to synthesize CoFe<sub>2</sub>O<sub>4</sub>/Al nanothermite films via an integration of nano-Al with CoFe<sub>2</sub>O<sub>4</sub> nanowires (NWs), which can be prepared through a facile hydrothermal-annealing route. The resulting nanothermite film demonstrates a homogeneous structure and an intense contact between the Al and CoFe<sub>2</sub>O<sub>4</sub> NWs at the nanoscale. In addition, both thermal analysis and laser ignition test reveal the superb energetic performances of the prepared CoFe<sub>2</sub>O<sub>4</sub>/Al NWs nanothermite film. Within different thicknesses of nano-Al for the CoFe<sub>2</sub>O<sub>4</sub>/Al NWs nanothermite films investigated here, the maximum heat output has reached as great as 2100 J·g<sup>−1</sup> at the optimal thickness of 400 nm for deposited Al. Moreover, the fabrication strategy for CoFe<sub>2</sub>O<sub>4</sub>/Al NWs is also easy and suitable for diverse thermite systems based upon other composite metal oxides, such as MnCo<sub>2</sub>O<sub>4</sub> and NiCo<sub>2</sub>O<sub>4</sub>. Importantly, this method has the featured advantages of simple operation and compatibility with microsystems, both of which may further facilitate potential applications for functional energetic chips.
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