
353Optical Nanosensors
pronounced and reversible changes in color and/or emission in the pres-
ence of volatile vapors). They prepared a ber-optic NS (Figure 6.7) by
constructing a nanocavity onto a cleaved-ended optical ber pigtail by elec-
trostatic self-assembly (ESA) method, doping this structure with the vapo-
chromic material belonging to a family of complexes of general formula
[Au
2
Ag
2
(C
6
F
5
)
4
L
2
]
n
, (where L can be pyridine (C
5
H
5
N), 2,2′bipridine, 1,10
phenantroline (C
12
H
8
N
2
), ½ diphenylacetylene (C
14
H
10
), and other ligands)
and is able to change its optical properties reversibly in the presence of
organic