Carry 630 series

The FT-IR spectra of the prepared were performed using a spectrometer (Agilent Technologies, Carry 630 series) equipped with an attenuated reflection accessory (ATR) containing a diamond/ZnSe crystal, at room temperature (25 °C) in the spectral range frequencies of 650-4000 cm -1 . For each spectrum, 32 scans of interferograms were averaged and the spectral resolution was 4 cm -1 . Data analysis and treatment was carried out by using the OMNIC Spectra software (ThermoFisher Scientific).

The prepared Cs-based hydrogels FT-IR analysis was performed by means of a spectrometer (Agilent Technologies, Carry630 series) with an attenuated reflection accessory (ATR) containing a diamond/ZnSe crystal, at room temperature (25 °C). Spectra were recorded in the spectral range frequencies of 650-4000 cm -1 , with 32 scans of interferograms and a resolution of 4 cm -1 . Prior to analysis, FT-IR spectrometer was calibrated via a background spectrum recorded from the clean and empty diamond for each spectrum. Data analysis was carried out using the OMNIC Spectra software (ThermoFisher Scientific).