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Characterization of nanoparticles (Bi2S3@BSA). (a) STEM image of Bi2S3@BSA nanoparticles and the corresponding size distribution histogram of the STEM image. (b) TEM image of Bi2S3@BSA nanoparticles (scale bar = 20 nm). (c) Graphical representation of hydrodynamic size diameter and zeta potential. (d) UV–vis spectrum of BSA and Bi2S3@BSA. (e) XRD pattern of the Bi2S3@BSA nanoparticles.
