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Metallic Nanomaterials for Sensitivity Enhancement of Fluorescence Detection

View Article: PubMed Central - PubMed

ABSTRACT

Utrasensitive detection of trace analytes by fluorescence benefits for fluorescence amplifying substrates. We review here our recent work concerned with understanding of enhancement mechanisms and formation of three such substrates: silver fractals, silver coated gold nanoparticles deposited on glass and fluorescence enhancing gold colloids.

No MeSH data available.


ESEM images of the silver structures (a) magnification × 7000, bar represents 5 um (b) magnification × 60000, bar represents 500 nm [7]. Reprint with permission from [7]. Copyright (2007) American Chemical Society.
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f3-sensors-08-00886: ESEM images of the silver structures (a) magnification × 7000, bar represents 5 um (b) magnification × 60000, bar represents 500 nm [7]. Reprint with permission from [7]. Copyright (2007) American Chemical Society.

Mentions: These structures were first examined in a laser scanning microscope and also in transmission as shown in Figure 1a and 1b. These two images were found to be highly correlated (Figure 2), with brighter regions in close correspondence to the thicker regions. A higher magnification SEM image shown in Figure 3 revealed that the structures had loose nanowire architecture with an arrangement of silver nanowires several micrometers in length and similar radius of approximately 50-100 nm in diameter. In such structures the surface area is proportional to thickness of the deposit and thus a possible reason for high fluorescence signals could be simple structure geometry and not fluorescence amplification.


Metallic Nanomaterials for Sensitivity Enhancement of Fluorescence Detection
ESEM images of the silver structures (a) magnification × 7000, bar represents 5 um (b) magnification × 60000, bar represents 500 nm [7]. Reprint with permission from [7]. Copyright (2007) American Chemical Society.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927526&req=5

f3-sensors-08-00886: ESEM images of the silver structures (a) magnification × 7000, bar represents 5 um (b) magnification × 60000, bar represents 500 nm [7]. Reprint with permission from [7]. Copyright (2007) American Chemical Society.
Mentions: These structures were first examined in a laser scanning microscope and also in transmission as shown in Figure 1a and 1b. These two images were found to be highly correlated (Figure 2), with brighter regions in close correspondence to the thicker regions. A higher magnification SEM image shown in Figure 3 revealed that the structures had loose nanowire architecture with an arrangement of silver nanowires several micrometers in length and similar radius of approximately 50-100 nm in diameter. In such structures the surface area is proportional to thickness of the deposit and thus a possible reason for high fluorescence signals could be simple structure geometry and not fluorescence amplification.

View Article: PubMed Central - PubMed

ABSTRACT

Utrasensitive detection of trace analytes by fluorescence benefits for fluorescence amplifying substrates. We review here our recent work concerned with understanding of enhancement mechanisms and formation of three such substrates: silver fractals, silver coated gold nanoparticles deposited on glass and fluorescence enhancing gold colloids.

No MeSH data available.