Environmentally sensitive silver nanoparticles of controlled size synthesized with PNIPAM as a nucleating and capping agent.
Metal nanoparticles combined with environmentally sensitive polymers can lead to enhanced nanometer-sized switches. We present a silver nanoparticle synthesis method that uses poly(N-isopropylacrylamide) (PNIPAM) as the nucleating, capping, and stabilizing agent. The synthesis is performed at room temperature by sodium borohydride-mediated reduction of silver nitrate in the presence of a fully hydrated polymer. The resulting metal nanoparticles have a narrow size distribution comparable to or better than those achieved with other synthesis methods. The silver particles can be thermally precipitated by the collapse of the PNIPAM shell and resolubilized with fast response times, as shown by surface plasmon spectroscopy. The silver-PNIPAM composite allows for combined surface plasmon and thermal switching applications.
Morones
J Ruben
JR
Departments of Chemical and Biomedical Engineering and Center for Nano and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, C0800, Austin, TX 78712, USA.
Frey
Wolfgang
W
D000180:Acrylic Resins / Q000737:chemistry*; D001894:Borohydrides / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D010084:Oxidation-Reduction; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D012835:Silver Nitrate / Q000737:chemistry; D020349:Surface Plasmon Resonance
D000180:Acrylic Resins; D001894:Borohydrides; C052970:poly-N-isopropylacrylamide; D012834:Silver; C025364:sodium borohydride; D012835:Silver Nitrate