
146 Biosensors Based on Nanomaterials and Nanodevices
They also grew AgI NPs on the surface of the SiNWs. First, SiNWs were prepared
and then modied with Ag NPs; the AgI NPs were then synthesized through the reac-
tion between Ag NPs and I
2
(Figure 6.25). The SERS of the AgI-modied SiNW sub-
strate was also observed due to the surface plasmon resonance of AgX (X = Cl, Br, and I)
(Figure 6.26). Though the SERS of the AgI-modied SiNWs was not as sensitive as that
of Ag NP-modied SiNWs as reported previously, the temperature-dependent ionic
conductivity, combined with the SERS, will nd wide application in nanodevices and
biological detectio