Cary 5000 uv vis nir spectrophotometer

Optical properties of the prepared dispersions were characterized in 10 mm path length cuvettes. Ultraviolet–visible (UV-vis) absorption spectra were recorded with a Cary 5000 UV-Vis-NIR spectrophotometer, and PL spectra were recorded using a Horiba FluroMax 4 spectrofluorometer (HORIBA Jobin Yvon, Kyoto, Japan, Japan–France). Optical density (OD) was detected in the 300–800 nm optical range. Fluorescence spectra were recorded at z-x excitation wavelengths. The emission of fluorescence was detected at 300–360 nm. To diminish agglomeration, all samples were subjected to additional centrifugation before measurements. To minimize possible re-absorption and scattering effect effects [28 (link)], all samples from Table 2 were centrifuged using an Eppendorf MiniSpin Centrifuge and diluted to achieve an optical density of less than 0.2 in the wavelength range of 300–360 nm, which corresponds to the excitation wavelengths used for PL measurements. Initial (C_i) and final (C_f) concentrations of MoS₂ and sodium cholate can be found in Table 2.
XPS spectra were acquired on an Axis Ultra DLD spectrometer (Kratos Analytical, Manchester, UK) with a monochromatic AlKα radiation source (hν = 1486.69 eV, 150 W). The pass energies of the analyzer were 160 eV for survey spectra and 40 eV for high-resolution scans.