Two-Dimensional Crystallization of Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles

Wang, Wenjie; Lawrence, Jack J.; Bu, Wei; Zhang, Honghu; Vaknin, David

doi:10.1021/acs.langmuir.8b01042

Two-Dimensional Crystallization of Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles

Journal Article · Wed Jun 27 00:00:00 EDT 2018 · Langmuir

DOI:https://doi.org/10.1021/acs.langmuir.8b01042· OSTI ID:1464476

Wang, Wenjie ^[1]; Lawrence, Jack J. ^[1]; Bu, Wei ^[2]; Zhang, Honghu ^[3]; ^[4]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Division of Materials Sciences and Engineering
Univ. of Chicago, IL (United States). NSF’s ChemMatCARS
Ames Lab., Ames, IA (United States). Dept. of Materials Science and Engineering
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

Surface-sensitive X-ray reflectivity and grazing incidence small-angle X-ray scattering reveal the structure of polymer-capped-gold nanoparticles (AuNPs that are grafted with poly(N-isopropylacrylamide); PNIPAM–AuNPs) as they self-assemble and crystallize at the aqueous suspension/vapor interface. Citrate-stabilized AuNPs (5 and 10 nm in nominal diameter) are ligand-exchanged by 6 kDa PNIPAM-thiol to form corona brushes around the AuNPs that are highly stable and dispersed in aqueous suspensions. Surprisingly, no clear evidence of thermosensitive effect on surface enrichment or self-assembly of the PNIPAM–AuNPs is observed in the 10–35 °C temperature range. However, addition of simple salts (in this case, NaCl) to the suspension induces migration of the PNIPAM–AuNPs to the aqueous surface, and above a threshold salt concentration, two-dimensional crystals are formed. In conclusion, the 10 nm PNIPAM–AuNPs form a highly ordered single layer with in-plane triangular structure, whereas the 5 nm capped NPs form short-range triangular structure that gradually becomes denser as salt concentration increases.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357; AC02-07CH11358

OSTI ID:: 1464476

Alternate ID(s):: OSTI ID: 1463708

Report Number(s):: IS-J--9723

Journal Information:: Langmuir, Journal Name: Langmuir Journal Issue: 28 Vol. 34; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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