Dong X., Zha L.S.
Donghua University, CN
Keywords: Au@Ag bimetallic nanorods, core-shell structure, smart composite microgels, surface enhanced Raman spectroscopy, thermo-responsiveness
In summary, monodisperse Au@Ag bimetallic nanorod is encapsulated by crosslinked poly(N-isopropylacrylamide) (PNIPAM) to produce thermo-responsive composite microgel with well-defined core-shell structure (Au@AgNR@PNIPAM microgel) by seed-precipitation polymerization method using butenoic acid modified Au@AgNRs as seeds. Their core-shell structure and thermo-responsive property were identified using TEM and DLLS respectively. As the temperature is raised from 20 to 50℃, their particle size decreases sharply, particularly within the temperature range of 30 to 40℃. The longitudinal localized surface plasmon resonance wavelength of the composite microgels measured by UV-vis spectroscopy is red-shifted from 677 to 704 nm within the same temperature range, indicating they have notable temperature-tunable plasmonic property. When the composite microgels are used as SERS substrates for detection of 210-5 M 1-naphthol in aqueous solution, their SERS activity can be tuned by temperature due to existence of entrapment effect during their temperature triggered volume phase transition.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2014: Graphene, CNTs, Particles, Films & Composites
Published: June 15, 2014
Pages: 180 - 183
Industry sector: Advanced Materials & Manufacturing
Topic: Nanoparticle Synthesis & Applications
ISBN: 978-1-4822-5826-4