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a) PA spectroscopy signals generated from a tygon® tube (I.D. 250 μm, O.D. 500 μm) filled with NanoCuN (20% colloidal suspension and rat blood. The laser was tuned to 720 nm wavelength. b) Comparative PA spectra of NanoCuN and rat blood over a 720–870 nm NIR wavelength range; c) Ratio of the peak-to-peak PA signal amplitudes generated from NanoCuN to those of blood over a range of 720–870 nm.
