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Two-dimensional assembly of gold nanoparticles grafted with charged-end-group polymers

Journal Article · · Journal of Colloid and Interface Science
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [4]
  1. Ames Laboratory, and Iowa State University, Ames, IA (United States)
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  4. Ames Laboratory (AMES), Ames, IA (United States)
We introduced charged terminal groups to polymers that graft nanoparticles enable Coulombic control over their assembly by tuning the pH and salinity of their aqueous suspensions. Gold nanoparticles (AuNPs) are grafted with poly (ethylene glycol) (PEG) terminated with CH3 (charge-neutral), COOH (negatively charged) or NH2groups (positively charged), and characterized with dynamic light scattering, ζ-potential, and thermal gravimetric analysis. Liquid surface X-ray reflectivity (XR) and grazing incidence small-angle X-ray scattering (GISAXS) are used to determine the density profile and in-plane structure of the AuNPs assembly at the aqueous surface. Assembly of PEG-AuNPs at the liquid/vapor interface is tunable by adjusting pH or salinity for COOH but less for NH2 terminals. The distinct assembly behaviors are attributed to the overall charge of PEG-AuNPs as well as PEG conformation. COOH-PEG corona is more compact than those of the other terminal groups, leading to a crystalline structure with a smaller superlattice. The net charge per particle depends not only on the PEG terminal groups but also on the cation sequestration of PEG and the intrinsic negative charge of the AuNP surface. The closeness to overall charge neutrality, and hydrogen bonding in play, brought by NH2-PEG, drive NH2-PEG-AuNPs to assembly and crystallinity without additives to the suspensions.
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); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358; SC0012704
OSTI ID:
1993987
Alternate ID(s):
OSTI ID: 1993644
Report Number(s):
IS-J -11,120
Journal Information:
Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Vol. 650; ISSN 0021-9797
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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