Papadakis D, Diamantopoulou A, Pantazopoulos PA, Palles D, Sakellis E, Boukos N, Stefanou N, Likodimos V. Nanographene oxide-TiO2 photonic films as plasmon-free substrates for surface-enhanced Raman scattering. Nanoscale [Internet]. 2019;11:21542-21553.