Abstract
We report a synthesis of L-cysteine capped monodispersed gold (Au) nanoparticles (NPs) with size ∼2.0 nm exhibiting a strong surface plasmon resonance optical absorption at 3.13 eV, which is blueshifted by 1.01 eV compared to the uncapped Au NPs of size 20.0 nm. A strong fluorescence (FL) of the capped Au NPs appears at 3.25 eV, whereas the uncapped Au NPs do not show any FL in this range. The L-cysteine concentration has been optimized to achieve one of the strongest ultraviolet absorption and luminescence. The capping of Au NPs has been confirmed by Fourier transform infra red measurement.
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