Nanocomposites (RF/MnO2) based on resorcinol–formaldehyde (RF) as carbon matrix and manganese oxide nanoparticles (MnO2) as incorporated material were elaborated by a sol–gel method. The effect of pyrolysis temperature was studied using different characterization techniques. Firstly, the Raman results show two strong peaks referred to G and D bands of carbon and an additional one related to MnO2. Also, it revea...