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Download filePreparation of Au Nanocolloids by in Situ Dispersion and Their Applications in Surface-Enhanced Raman Scattering (SERS) Films
journal contribution
posted on 2016-05-31, 00:00 authored by Le Du, Yujun Wang, Zhongqi Ren, Chun Shen, Guangsheng LuoThe size uniformity and dispersity
of inorganic nanoparticles are important when they are dispersed in
organic phase and serve as the precursor for particle-deposited nanosensors.
However, most of the nanoparticles are dispersed into coating solutions
right after surface modification, where the natural tendency of nanoparticles
to agglomerate reduces the monodispersity and size uniformity during
the coating process. By initiation of microdroplet coalescence, a
method for in situ dispersion of surface-modified Au nanoparticles
is presented in this study. Under optimal conditions, about 88% of
the modified Au nanoparticles with an average size of 19 nm could
be in situ dispersed. On the basis of dip-coating of the monodispersed
Au nanocolloids, a SERS (surface-enhanced Raman scattering) film was
fabricated by uniformly depositing particles onto the surface and
tremendous enhancement of Raman scattering was achieved. The SERS
film could be used to detect a representative contaminant, trans-1,2-bis(4-pyridyl)ethylene (BPE), with a detection
limit of down to 10 ppb.