Figure 2.

Surface chemistry of modified SNPs with different functional groups and at different sizes. (A and D) FTIR spectra were obtained by scanning the pellets of different SNPs and KBr from 500 to 4000 cm⁻¹, and the absorbance was recorded. FTIR spectra were normalized using the band intensity at 806 cm⁻¹ for semi-quantitative comparison of the SNPs. (B and E) TGA traces of different SNPs were measured by burning the SNPs in air at a rate of 10 °C/min, and the weight retention of SNPs at different temperatures (120–850°C) was recorded. (C and F) Different SNPs (100 μg/ml) were sonicated, and DLS data (size distribution by intensity) were measured at 25 °C.