Agradecimentos: The authors are grateful to UCS, INCT-INES-CNPq (Grant #554336/2010-3), CAPES (Grant #Brafitec 087/11, FAPERGS and SUMA2 Network Project - 7th Framework Program of the European Commission (IRSES Project #318903) for financial support. SRSM is FAPERGS fellow. CMM is CAPES fellow. MEHMC, FLF, FA, and CAF are CNPq fellows. FA was supported by FAPESP project 2012/10127-5 Ver menos

Abstract: The friction phenomenon is a ubiquitous manifestation of nature. Models considering phononic, electronic, magnetic, and electrostatic interactions are invoked to explain the fundamental forces involved in the friction phenomenon. In order to establish the incidence of the phonon prompting at the nanoscale friction by direct contact, we study a diamond spherical dome sliding on carbon thin films containing different amount of deuterium and hydrogen. The friction coefficient decreases by substituting hydrogen by deuterium atoms. This result is consistent with an energy dissipation vibration local mechanism from a disordered distribution of bond terminators Ver menos