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We show by UV-Vis reflectance investigations that your local area plasmon resonance (LSPR) of Ag NPs partly covered with graphene is preserved for at least 3 months, i.e., three times more than the LSPR of bare Ag NPs. The progressive loss in LSPR is a result of the spontaneous sulfurization of non-covered Ag NPs, as revealed by checking electron microscopy and energy-dispersive X-ray spectroscopy. We show that the Ag NPs completely sandwiched between graphene and HOPG do not sulfurize, eve