title: High-density silver nanoparticle film with temperature-controllable interparticle spacing for a tunable surface enhanced Raman scattering substrate.
abstract: The formation of high-density silver nanoparticles and a novel method to precisely control the spacing between nanoparticles by temperature are demonstrated for a tunable surface enhanced Raman scattering substrates. The high-density nanoparticle thin film is accomplished by self-assembling through the Langmuir-Blodgett (LB) technique on a water surface and transferring the particle monolayer to a temperature-responsive polymer membrane. The temperature-responsive polymer membrane allows producing a dynamic surface enhanced Raman scattering substrate. The plasmon peak of the silver nanoparticle film red shifts up to 110 nm with increasing temperature. The high-density particle film serves as an excellent substrate for surface-enhanced Raman spectroscopy (SERS), and the scattering signal enhancement factor can be dynamically tuned by the thermally activated SERS substrate. The SERS spectra of Rhodamine 6G on a high-density silver particle film at various temperatures is characterized to demonstrate the tunable plasmon coupling between high-density nanoparticles.
authors.affiliation: Berkeley Sensor and Actuator Center, Department of Bioengineering, University of California-Berkeley, Berkeley, California 94720, USA. lplee@socrates.berkeley.edu
authors.forename: Yu
authors.initials: Y
authors.lastname: Lu
authors.forename: Gang L
authors.initials: GL
authors.lastname: Liu
authors.forename: Luke P
authors.initials: LP
authors.lastname: Lee
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D020349:Surface Plasmon Resonance; D013696:Temperature
chemical_list: D000180:Acrylic Resins; D005456:Fluorescent Dyes; C052970:poly-N-isopropylacrylamide; D012834:Silver