TY  - JOUR
AU  - Shi, Li
AU  - Carn, Florent
AU  - Boué, François
AU  - Buhler, Eric
TI  - Gold Nanoparticle–Polyelectrolyte Complexes with Tunable Structure Probed by Synchrotron Small-Angle X-ray Scattering: Implications for the Production of Colloidal Crystals-Based Nanophotonic Materials
JO  - ACS applied nano materials
VL  - 6
IS  - 5
SN  - 2574-0970
CY  - Washington, DC
PB  - ACS Publications
M1  - PUBDB-2023-01197
SP  - 3990 - 4004
PY  - 2023
N1  - Waiting for fulltext
AB  - Close-packed colloidal crystals of gold nanoparticles (AuNPs) are of great interest in the field of nanophotonics due to their lattice-pattern-dependent optical properties. One challenge resides in producing such crystalline assemblies by a scalable approach involving polydisperse AuNPs obtained by standard synthesis routes and structuring natural molecules in water at room temperature. Electrostatic complexation between functionalized AuNPs and oppositely charged polyelectrolytes (PELs) is a very simple way to create AuNP self-assemblies of different morphologies and compactness. Our work investigates, using synchrotron small-angle X-ray scattering, their structure as a function of concentration, PEL persistence length and ionic strength. By decreasing the radius, R, of the positively charged gold nanoparticles to a few nm (R ≤ 3 nm) and increasing the polyelectrolyte persistence length, L<sub>T</sub>, substituting flexible sodium polystyrenesulfonate for natural semiflexible hyaluronan, we tuned the characteristic ratio L<sub>T</sub>/R up to values of ≥1.85. Such ratios allow the successful formation of a new AuNPs arrangement with a high degree of short-range order at low ionic strength and of crystalline order when interactions are screened by addition of salt. This approach involving commercially available natural water-soluble semiflexible PELs, opens a low-cost and promising way for the one-step production of gold colloidal crystals, which can be of ubiquitous utility in nanophotonics. 
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000937168200001
DO  - DOI:10.1021/acsanm.3c00259
UR  - https://bib-pubdb1.desy.de/record/580329
ER  -