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Bimetallic nanopetals for thousand-fold fluorescence enhancements
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic of fabrication process and creation of hot spots on bimetallic nanopetals. SEM images with large-scale biaxial (b) and uniaxial (c) Au/Ag petals on shrunk PS sheets. The insets in (b) and (c) show corresponding enlarged view of SEM images. The scale bars in (b) and (c) are . The scale bars in inset of (b) and (c) are . (d) Histograms of gaps dimensions are normalized by their maximum values.

Image of FIG. 2.
FIG. 2.

(a) Three-dimensional two photon excitation fluorescence images of fluorescein molecules on biaxial (left) and uniaxial (right) nanopetals. (b) Vertical cross-section images and the intensity profiles (insets) along the arrows. The FWHMs of enhancement regions (denoted by “1” to “4”) are diffraction-limited size . The scale bars are . (c) Time traces of fluorescence emission from molecules enhanced on the edges of biaxial petals (solid line) and uniaxial (dashed line) petals, along with their enlarged views (inset).

Image of FIG. 3.
FIG. 3.

(a) Left: fluorescence intensity histograms of dye molecules on biaxial (top) and uniaxial (bottom) nanopetals excited by various laser powers (blue: 0.6 mW, red: 1.8 mW, green: 3 mW). Right: at 3 mW excitation power, corresponding fluorescence images show many spots emitting bright fluorescence which saturate the avalanche photodiode. Green arrows indicate the saturation point. (b) Fluorescence lifetime measurements of dyes on a glass plate (top line), biaxial petals (solid line), and uniaxial petals (dashed line).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bimetallic nanopetals for thousand-fold fluorescence enhancements