We show that strong photoluminescence (PL) can be induced in single-layer graphene using an oxygen plasma treatment. The PL is spatially uniform across the flakes and connected to elastic scattering spectra distinctly different from those of gapless pristine graphene. Oxygen plasma can be used to selectively convert the topmost layer when multilayer samples are treated.

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Drug-eluting stents (DES) have profoundly affected the field of inter\'entional cardiology by dramatically reducing the problem of in-stent restenosis. However, the adverse, longterm, thrombosis raises the questions on the safety profile of DES. Femtosecond pulsed laser nanotexturing of metallic stents was peiformed to minimize thrombosis by improving three fundamental characteristics of DES: (1) increase the-availability of drug for elation: (2) enhance the adhesion between stent and drug; and (3) minimize and, if possible, eliminate the polymer carrier. Results of laser-induced nanoprotrusionldrug interactions confirmed these benefits and indicated that femtosecond laser nanotexturing is a potential cost-effective solution for improving the performance and safety of DES while eliminating the need for postfinishing operations.

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