Effect of Polymer Chain Length on the Superlattice Assembly of Functionalized Gold Nanoparticles
- Ames Lab., and Iowa State Univ., Ames, IA (United States)
- Ames Lab., Ames, IA (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
We report on the assembly of gold nanoparticle (AuNPs) superlattices at the liquid/vapor interface and in the bulk of their suspensions. Interparticle distances in the assemblies are achieved on multiple length scales by varying chain lengths of surface grafted AuNPs by polyethylene glycol (PEG) with molecular weights in the range 2000–40,000 Da. Crystal structures and lattice constants in both 2D and 3D assemblies are determined by synchrotron-based surface-sensitive and small-angle X-ray scattering. Here, assuming knowledge of grafting density, we show that experimentally determined interparticle distances are adequately modeled by spherical brushes close to the θ point (Flory–Huggins parameter, x ≈ 1/2) for 2D superlattices at a liquid interface and a nonsolvent (χ = ∞) for the 3D dry superlattices.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; AC02-07CH11358; SC0012704
- OSTI ID:
- 1823631
- Report Number(s):
- BNL-222188-2021-JAAM; IS-J-10,563
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 33 Vol. 37; ISSN 0743-7463
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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