Gold Nanoparticle‐Based Fluorometric and Colorimetric Sensing of Copper(II) Ions

merized to form a random-phase segregated morphology referred to as the floodlit region. Film thickness was controlled by the addition of 10 lm diameter glass rods to the pre-polymer syrup. The diffraction efficiency of the grating was determined through the ratio of the intensity of diffracted light to incident light using a He–Ne (632 nm) laser. SEM images were collected with a Hitachi 900S operating at 1 keV. The PM597 was excited with the doubled output (532 nm) of a Nd:YAG that had a repetition rate of 10 Hz and pulse duration of 5–8 ns. Photoluminescence (PL) was collected perpendicular to the cell with an Ocean Optics CCD/spectrometer that had a resolution of 1.9 nm.

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