Fig. 3
From: 2D transition metal dichalcogenides with glucan multivalency for antibody-free pathogen recognition
Multivalent hydrogen bonding in dex-WS2 nanosheets. a Photographs and b UV–Vis spectra of the solution of WS2 nanosheets exfoliated and functionalized by dextran in the presence of a proton acceptor DIEA at various concentrations. c FT-IR spectra of dex-WS2 and dextran, showing hydrogen bonding between WS2 and dextran. d Absorbance plot of the repeated redispersion of dex-WS2 after centrifugation, demonstrating that the multivalent hydrogen bonding is sufficiently strong to maintain the stability of the dex-WS2 colloid in repeated centrifugation-redispersion processes. The absorbance was measured at 621 nm. All error bars represent a standard deviation from the mean values (n = 4)
