Two-Dimensional Crystallization of Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1464476
- Report Number(s):
- IS-J-9723
Journal ID: ISSN 0743-7463
- Grant/Contract Number:
- AC02-07CH11358; AC02-06CH11357; CHE-1346572
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Langmuir
- Additional Journal Information:
- Journal Volume: 34; Journal Issue: 28; Journal ID: ISSN 0743-7463
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Wang, Wenjie, Lawrence, Jack J., Bu, Wei, Zhang, Honghu, and Vaknin, David. Two-Dimensional Crystallization of Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles. United States: N. p., 2018.
Web. doi:10.1021/acs.langmuir.8b01042.
Wang, Wenjie, Lawrence, Jack J., Bu, Wei, Zhang, Honghu, & Vaknin, David. Two-Dimensional Crystallization of Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles. United States. https://doi.org/10.1021/acs.langmuir.8b01042
Wang, Wenjie, Lawrence, Jack J., Bu, Wei, Zhang, Honghu, and Vaknin, David. Wed .
"Two-Dimensional Crystallization of Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles". United States. https://doi.org/10.1021/acs.langmuir.8b01042. https://www.osti.gov/servlets/purl/1464476.
@article{osti_1464476,
title = {Two-Dimensional Crystallization of Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles},
author = {Wang, Wenjie and Lawrence, Jack J. and Bu, Wei and Zhang, Honghu and Vaknin, David},
abstractNote = {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.},
doi = {10.1021/acs.langmuir.8b01042},
journal = {Langmuir},
number = 28,
volume = 34,
place = {United States},
year = {Wed Jun 27 00:00:00 EDT 2018},
month = {Wed Jun 27 00:00:00 EDT 2018}
}
Web of Science
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