Integration of the 3DOM Al/Co3O4 nanothermite film with a semiconductor bridge to realize a high-output micro-energetic igniterElectronic supplementary information (ESI) available: Information on morphology images, comparisons for the sparks of the micro-energetic igniter at different voltages, analyses for the voltage-current curves, analyses for the input energy curves, DSC data, data of the ignition time and ignition energy. See DOI: 10.1039/c7ra11293a

Microigniters play an important role for the reliable initiation of micro explosive devices. However, the microigniter is still limited by the low out-put energy to realize high reliability and safety. Integration of energetic materials with microigniters is an effective method to enhance the ignition ability. In this work, a Al/Co 3 O 4 nanothermite film with a three-dimensionally ordered macroporous structure was prepared by the deposition of nanoscale Al layers using magnetron sputtering on Co 3 O 4 skeletons that are synthesized using an inverse template method. Both the uniform structure and nanoscale contact between the Al layers and the Co 3 O 4 skeletons lead to an excellent exothermicity. In order to investigate the ignition properties, a micro-energetic igniter has been fabricated by the integration of the Al/Co 3 O 4 nanothermite film with a semiconductor bridge microigniter. The thermite reactions between the nanoscale Al layer and the Co 3 O 4 skeleton extensively promote the intensity of the spark, the length in duration and the size of the area, which greatly enhance the ignition reliability of the micro-energetic igniter. Moreover, this novel design enables the micro-energetic igniter to fire the pyrotechnic Zr/Pb 3 O 4 in a gap of 3.7 mm by capacitor discharge stimulation and to keep the intrinsic instantaneity high and firing energy low. The realization of gap ignition will surely improve the safety level of initiating systems and have a significant impact on the design and application of explosive devices. A micro-energetic igniter integrated with a 3DOM Al/Co 3 O 4 nanothermite film is able to generate larger spark and realize gap ignition.