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Nanosensors
book

Nanosensors

by Vinod Kumar Khanna
April 2016
Intermediate to advanced content levelIntermediate to advanced
666 pages
22h 57m
English
CRC Press
Content preview from Nanosensors
506 Nanosensors: Physical, Chemical, and Biological
1/R
4
distance dependence. Because a 1.4 nm gold particle is below the nor-
mal mean free-path of an electron in gold at normal temperatures, the only
scattering event an electron will feel is that of the surface potential. In other
words, it is expected that the electrons spend all of their time at the sur-
face of the particle. If a common uorophore such as uorescein (C
20
H
12
O
5
) is
placed near such a particle, then the uorescence quantum efciency of the
dye begins to decrease with a 1/R
4
distance dependence. The basis of NSET
arises from the damping of the uorophore’s oscillating dipole by the free
electrons of gold metal as a through-space mechanism. Because the electrons
of the
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Publisher Resources

ISBN: 9781439827130