Controllable 3D Hot-Junctions of Silver Nanoparticles Stabilized by Amphiphilic Tri-block Copolymer/Graphene Oxide Hybrid Surfactants for Use as Surface-Enhanced Raman Scattering Substrates
| Autor: | Chih-Wei Chiu, Yen-Chen Lee, Gang-Bo Ou, Chih-Chia Cheng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Graphene General Chemical Engineering Oxide Substrate (chemistry) Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Silver nanoparticle 0104 chemical sciences law.invention symbols.namesake chemistry.chemical_compound chemistry Transmission electron microscopy law Amphiphile Copolymer symbols 0210 nano-technology Raman scattering |
| Zdroj: | Industrial & Engineering Chemistry Research. 56:2935-2942 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.6b03504 |
| Popis: | We herein report the manufacture of surface-enhanced Raman scattering (SERS) substrates in which silver nanoparticles (AgNPs) are well dispersed in an organic/inorganic nanohybrid surfactant consisting of an amphiphilic triblock copolymer and graphene oxide (GO). Transmission electron microscopy measurements confirmed that the resulting AgNPs had a narrow size distribution of ∼15 nm. These AgNPs were adsorbed on both sides of the GO nanosheets, forming controllable nanodispersions of the AgNPs/copolymer/GO hybrid. A facile method for fabricating the desired nanohybrid SERS films was therefore developed by immobilizing spherical AgNPs with a narrow size distribution on both sides of the 3–5 nm-thick GO nanosheets, which afforded 1–5 nm interparticle distances between the AgNPs. Furthermore, the hybrid substrate films formed three-dimensional (3D) hot-junctions and exhibited an SERS enhancement factor (EF) of 1.2 × 105 toward adenine molecules from DNA, which served as a model biomolecular target. |
| Databáze: | OpenAIRE |
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