Copper nanoparticles with a mean carbon coating of about 1 nm were continuously produced at up to10 g h−1 using amodified flame spray synthesis unit under highly reducing conditions. Raman spectroscopy and solid state13C magicangle spinning nuclear magnetic resonance spectroscopy revealed that the thin carbon layer consistedof a sp2-hybridized carbon modification in the form of graphene stacks. The carbon layer protectedthe copper nanoparticles from oxidation in air. Bulk pills of pressed carbon/coppernanoparticles displayed a highly pressure- and temperature-dependent electricalconductivity with sensitivity at least comparable to commercial materials. These propertiessuggest the use of thin carbon/copper nanocomposites as novel, low-cost sensor materialsand offer a metal-based alternative to the currently used brittle oxidic spinels orperovskites.