Cascade synthesis of a gold nanoparticle–network polymer composite [electronic resource].
- Washington, D.C. : United States. National Nuclear Security Administration, 2015. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 2,601-2,612 : digital, PDF file
- Additional Creators:
- Sandia National Laboratories, United States. National Nuclear Security Administration, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- In this paper, the multi-step, cascade synthesis of a self-supporting, hierarchically-structured gold nanoparticle hydrogel composite is described. The composite is spontaneously prepared from a non-covalent, lamellar lyotropic mesophase composed of amphiphiles that support the reactive constituents, a mixture of hydroxyl- and acrylate-end-derivatized PEO<sub>117</sub>-PPO<sub>47</sub>-PEO<sub>117</sub> and [AuCl<sub>4</sub>]<sup>-</sup>. The reaction sequence begins with the auto-reduction of aqueous [AuCl<sub>4</sub>]<sup>-</sup> by PEO<sub>117</sub>-PPO<sub>47</sub>-PEO<sub>117</sub> which leads to both the production of Au NPs and the free radical initiated polymerization and crosslinking of the acrylate endderivatized PEO<sub>117</sub>-PPO<sub>47</sub>-PEO<sub>117</sub> to yield a network polymer. Optical spectroscopy and TEM monitored the reduction of [AuCl<sub>4</sub>]<sup>-</sup>, formation of large aggregated Au NPs and oxidative etching into a final state of dispersed, spherical Au NPs. ATR/FT-IR spectroscopy and thermal analysis confirms acrylate crosslinking to yield the polymer network. X-ray scattering (SAXS and WAXS) monitored the evolution of the multilamellar structured mesophase and revealed the presence of semi-crystalline PEO confined within the water layers. The hydrogel could be reversibly swollen without loss of the well-entrained Au NPs with full recovery of composite structure. Finally, optical spectroscopy shows a notable red shift (Δλ~ 45 nm) in the surface plasmon resonance between swollen and contracted states, demonstrating solvent-mediated modulation of the internal NP packing arrangement.
- Published through SciTech Connect., 11/02/2015., "sand2015--2522j", "579846", Nanoscale 8 5 ISSN 2040-3364 AM, and Simonida Grubjesic; Bryan Scott Ringstrand; Katherine L. Jungjohann; Scott M. Brombosz; Sönke Seifert; Millicent Anne Firestone.
- Funding Information:
- AC04-94AL85000 and AC52-06NA25396
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