aerographene

— To do so, the materials scientists used the "aerographene" aeromaterial, which consists of just a few layers of carbon atoms and 99.9% air. When heated, this air contained inside the material is also heated extremely quickly and expands. […] "This means we are now able to use aerographene to start small controllable and repeatable explosions that do not require a chemical reaction," says Schütt, summarizing their findings.