Assembling Bare Au Nanoparticles at Positively Charged Templates
- Ames Lab., Ames, IA (United States). Div. of Materials Sciences and Engineering
- Ames Lab., Ames, IA (United States). Div. of Materials Sciences and Engineering; Iowa State Univ., Ames, IA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source, X-ray Science Div.
- Ames Lab., Ames, IA (United States). Div. of Materials Sciences and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Chemical and Biological Engineering
- Ames Lab., Ames, IA (United States). Div. of Materials Sciences and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
In-situ X-ray reflectivity (XRR) and grazing incidence X-ray small-angle scattering (GISAXS) reveal that unfunctionalized (bare) gold nanoparticles (AuNP) spontaneously adsorb to a cationic lipid template formed by a Langmuir monolayer of DPTAP (1,2-dihexadecanoyl-3-trimethylammonium-propane) at vapor/aqueous interfaces. Analysis of the XRR yields the electron density profile across the charged-interfaces along the surface normal showing the AuNPs assemble with vertical thickness comparable to the particle size. The GISAXS analysis indicates that the adsorbed mono-particle layer exhibits short-range in-plane correlations. By contrast, single-stranded DNA-functionalized AuNPs, while attracted to the positively charged surface (more efficiently with the addition of salt to the solution), display less in-plane regular packing compared to bare AuNPs.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1257413
- Report Number(s):
- IS-J-8993; srep26462; TRN: US1601754
- Journal Information:
- Scientific Reports, Vol. 6; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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