Abstract
Pure poly(dimethylsiloxane) (PDMS) films, PDMS–nanodiamond (ND) and purenanodiamond powder were irradiated with 2 MeV protons under a variety of fluence andcurrent conditions. Upon proton irradiation, these samples acquire a fluence-dependentphotoluminescence (PL). The emission and excitation spectra, photostability and emissionlifetime of the induced photoluminescence of PDMS and PDMS–ND samples are reported.Pure PDMS exhibits a noticeable stable blue PL, while the PDMS–ND composites exhibita pronounced stable green PL under 425 nm excitation. The PL of PDMS–ND composites ismuch more prominent than that of pure PDMS or pure ND powder even when irradiatedat higher doses. The origin of the significantly enhanced PL intensity for theproton-irradiated PDMS–ND composite is explained by the combination of enhancedintrinsic PL within ND particles due to ion-implantation-generated defects andby PL originating from structural transformations produced by protons at thenanodiamond/matrix interface.
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