期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 5, 页码 1461-1467出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03749
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资金
- U.S. Department of Energy (U.S. DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- U.S. DOE [DE-AC02-07CH11358, DE-AC02-06CH11357]
The crystalline qualities of PEG-AuNPs assemblies can be varied by controlling electrolyte concentration, pH, and temperature. Lowering the pH induces interpolymer complexation with PAA, while increasing the temperature strengthens interparticle attraction, leading to improved supercrystal structures. The effects of PAA and PEG chain lengths on assemblies are investigated, and optimal conditions for creating improved superlattices are discussed.
Using synchrotron-based small-angle X-ray scattering techniques, we demonstrate that poly(ethylene glycol)-functionalized gold nanoparticles (PEG-AuNPs) are assembled into close-packed structures that include short-range order with face-centered cubic structure, where crystalline qualities are varied by controlling the electrolyte concentration, pH, and temperature of the suspensions. We show that interpolymer complexation with poly(acrylic acid) (PAA) is induced by lowering the pH level of the PEG-AuNPs suspensions, and furthermore, increasing the temperature of the suspension strengthens interparticle attraction, leading to improved supercrystal structures. Our results indicate that this strategy creates robust nanoparticle superlattices with high thermal stability. The effects of PAA and PEG chain lengths on the assemblies are also investigated, and their optimal conditions for creating improved superlattices are discussed.
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