Lamellar and hexagonal assemblies of silver nanoparticles (AgNPs) were formed by grafting them with thiolated polyethylene glycol (PEG). Novel two- and three-dimensional assemblies were achieved by controlling differences in core AgNP types and grafting densities.
Incomplete grafting of PEG on AgNPs leads to bi-directional bonding among particles and novel assembly structures not observed with PEG-functionalized AuNPs alone. Such control allows for designing and tailoring NPs assembly in photonics, plasmonics, and other applications.
- Small angle Xray scattering (SAXS) at the APS used to monitor the three-dimensional (3D) assemblies in bulk suspensions.
- K2CO3 induces 2D hexagonal structure at the liquid/vapor interface and 3D hexagonal columnar structure in solutions.
Kim, H. J., Wang, W., Bu, W., Mallapragada, S. K., & Vaknin, D. (2022). Lamellar and hexagonal assemblies of PEG-grafted silver nanoparticles: Implications for plasmonics and photonics. ACS Applied Nano Materials, 5(12), 17556–17564. https://doi.org/10.1021/acsanm.2c03042