Hydrophobic teflon films as concentrators for single-molecule SERS detection
J. Mater. Chem., 22 (2012), pp. 20986–20990
Abstract
Teflon films, made from polytetrafluoroethylene (PTFE), are widely known hydrophobic materials. In this paper, we utilize Teflon films as concentrators to construct active surface-enhanced Raman scattering (SERS) substrates to achieve a higher sensitivity for SERS detection. The fabrication method is simple via directly depositing a drop of silver colloidal solution on a piece of commercial Teflon film and drying it under ambient conditions. SERS measurements are carried out on Rhodamine6G (R6G) molecules, showing strong enhanced SERS signals even at a concentration of 10-15 M and allowing single-molecule detection. Silver nanoparticles (Ag-NPs) supported on the Teflon films exhibit a higher SERS enhancement and better reproducibility compared with that on glass slides. Such a high enhancement effect is primarily attributed to the hydrophobic condensation effect of Teflon films towards both silver colloids and R6G molecules, thus causing the aggregation of Ag-NPs for more "hot-spots" and delivering R6G molecules to the hot-spot areas thereby overcoming the limit of diffusion. © 2012 The Royal Society of Chemistry.
Hydrophobic teflon films as concentrators for single-molecule SERS detectionJ. Mater. Chem., 22 (2012), pp. 20986–20990AbstractTeflon films, made from polytetrafluoroethylene (PTFE), are widely known hydrophobic materials. In this paper, we utilize Teflon films as concentrators to construct active surface-enhanced Raman scattering (SERS) substrates to achieve a higher sensitivity for SERS detection. The fabrication method is simple via directly depositing a drop of silver colloidal solution on a piece of commercial Teflon film and drying it under ambient conditions. SERS measurements are carried out on Rhodamine6G (R6G) molecules, showing strong enhanced SERS signals even at a concentration of 10-15 M and allowing single-molecule detection. Silver nanoparticles (Ag-NPs) supported on the Teflon films exhibit a higher SERS enhancement and better reproducibility compared with that on glass slides. Such a high enhancement effect is primarily attributed to the hydrophobic condensation effect of Teflon films towards both silver colloids and R6G molecules, thus causing the aggregation of Ag-NPs for more "hot-spots" and delivering R6G molecules to the hot-spot areas thereby overcoming the limit of diffusion. © 2012 The Royal Society of Chemistry.
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