[RSC Advances] Heterogemini surfactant assisted synthesis of monodisperse icosahedral gold nanocrystals and their applications in electrochemical biosensing
writer：Liming Chen, Anirban Dandapat, Youju Huang,* Jiawei Zhang, Yoel Sasson, Linxi Hou, Tao Chen*
keywords：Au NPs, Biosensing
source：期刊
specific source：RSC Advances, 2016, 6, 31301-31307
Issue time：2016年
Icosahedral nanocatalysts (NCs) have shown very interesting physical
and chemical properties owing
to their multiply twinned nanostructures.
Herein, we introduce a novel heterogemini surfactant (C10OhpNC8) assisted seed mediated growth approach for the
synthesis of monodisperse icosahedral gold (Au) NCs in aqueous solution at room
temperature. Very small shape impurities were observed in the resultant icosahedral
Au NCs. Significantly improved monodispersity (relative standard deviation (RSD)
of <10%) has been achieved by using
binary mixture of C10OhpNC8 and PVP as structure
directing agents. Interestingly, the size of icosahedral Au NCs can be tuned ranging
from 40 nm to 190 nm, which guides the surface plasmon resonance (SPR) peak to
be tuned throughout the whole visible region and even to near infrared (NIR)
region. Furthermore, the
developed icosahedral Au NCs specific probe has been designed to be applied as
an easy electrochemical biosensor and successfully used to detect the bacteria Escherichia coli O157:H7 (E. coli O157:H7) with
detection limit of ~10 colony forming units (CFU)/mL. Notably, the sensitivity
of this icosahedral Au NCs probes has been achieved to be much higher compared
to the traditional colloidal gold immunochromatography (detection limit ~103 CFU/mL).