Fluorescence enhancement from Langmuir-Blodgett monolayers on silver island films

Abstract

guishing high and low Si/Al ratio zeolites and may be important in studies of zeolites that are chemically or physically altered.Acknowledgment. The support of the National Sci-ence Foundation under Grant CHE 8204417 is gratefully acknowledged. We thank Professor T.

Surface-enhanced Raman and fluorescence joint analysis of soil humic acids

“…SEF effect is also induced by LPR near a metal surface [32,33]. However, the net effect seems to vary depending on the distance between the fluorophore and the surface, as well as on the intrinsic quantum yield of the fluorophore [34].…”

Recent progress on colloidal metal nanoparticles as signal enhancers in nanosensing

“…Recently, the formation of SEF planar platforms via the assembly of colloidal NPs with controlled geometry onto substrates has gained increasing interest. There are many possible designs such substrates based on AuNPs and quantum dots [122], Langmuir-Blodgett arrays of AuNPs [123], or copper arrays [124]. However, for detection the recognition event between the SEF platform and the analyte determines the specificity and sensitivity of the sensor.…”

Amplified light scattering and emission of silver and silver core–silica shell particles

“…Simultaneous excitation of surface plasmon resonance (SPR) bands and absorption-excitation band(s) of the fluorescent molecule is required. Various strategies [2][3][4][5], using spacers between the metal surface and the fluorescent molecule, have been used to determine the optimal distance for maximum amplification of emission intensities. The metal substrates in these studies also have the surface roughness features that have been necessary for maximal SERS intensity.…”

“…A new system of "class 2 probes" was first tested on single, isolated, ∼200 nm Ag particles in suspension for the following reasons: (1) their ease of preparation in large amounts from commonly available chemicals; (2) ability to be visualized in a light microscope at 1000× magnification and to observe light scatter of individual silver particles in a flow cytometer; (3) better control over size distribution of Ag particles compared to "class 1 probes," yielding a tighter distribution in forward versus side scatter histograms. The "class 2 probes" described herein further differ from Ag particle systems that were previously reported [13,14], in that the silver particles are larger than ∼100 nm in diameter so that they can be resolved from background in side scatter versus forward scatter histograms obtained by flow cytometry.…”