Figure 3.

Biodegradation performance of WS₂/PEG nanostructures in DMEM for AC-pulse electrothermal therapeutics. (a) Absorbance spectra of the WS₂/PEG stored in DMEM for different weeks. (b) Variation of the normalized absorbance at a wavelength of 875 nm in different weeks. (c) XPS spectra showing the binding energies of S 2p of the pure WS₂ and WS₂/PEG stored in DMEM for a week. The XPS counts were normalized to background. (d) Schematic illustration of the biodegradation process of WS₂/PEG via a PEG-facilitated disrupt-and-release process in physiological environments.