Abstract
We report photodetection in a very large spectral bandwidth, which encompasses ultraviolet,visible and near infrared, using graphene inks or graphene inks functionalized with eithergold or silver nanoparticles, or gold nanoparticles further encapsulated with bovine serumalbumin deposited on interdigitated electrodes fabricated on a silicon dioxide/silicon substrate.In contrast to gold-functionalized graphene inks, which have responsivities better than1 mA W − 1 at a 0.1 V bias over the huge bandwidth extending from 215 to 2500 nm, Ag-functionalizedinks show at least a four-fold increased responsivity, with a record value of13.7 mA W − 1 in near infrared.
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