2.6. UV–vis Spectra

UV–vis measurements of 100 µL of an Au NPs aqueous 1.97 × 10⁻⁷ M solution diluted with 2 mL of CH₃OH upon the addition up to 900 µL of a 2.07 × 10⁻⁵ M porphyrin CH₃OH solution were carried out using a UV–vis V-650 Jasco spectrometer (UV–Visible Spectrometers, Easton, MD, USA). The spectra were recorded with a 0.2 nm resolution at room temperature in quartz cells with a path length of 1 cm (3.5 mL capacity).