Accelerating Gold Nanorod Synthesis with Nanomolar
Concentrations of Poly(vinylpyrrolidone)
Posted on 2017-10-16 - 00:00
A novel
modification for the seedless synthesis of gold nanorods
(AuNRs) has been developed. Nanomolar concentrations of 10 kDa poly(vinylpyrrolidone)
(PVP) can be introduced to a growth solution containing 25, 50, or
100 mM cetyltrimethylammonium bromide (CTAB) to significantly reduce
the dimensions of AuNRs. We found that PVP accelerates the growth
rate of AuNRs by more than two times that of nanorods grown in 50
and 100 mM CTAB solutions. Additionally, there is a time-dependent
effect of adding PVP to the nanorod growth solution that can be utilized
to tune their aspect ratio. Because the concentration of PVP is far
below the concentration of HAuCl4 in the reaction mixture,
PVP primarily functions not as a reducing agent, but as a capping
or templating ligand to stabilize the growing nanorods. Our reproducible
protocol enables the synthesis of AuNRs in high yield with tunable
sizes: 45 × 6.7, 28 × 5.5, and 12 × 4.5 nm for 100,
50, and 25 mM CTAB, respectively. We estimated the number of PVP chains
per nanorod in growth solutions to be around 30, which suggests that
the effect on the aspect ratio is caused by a direct interaction between
the AuNR surface and the PVP.
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Requejo, Katherinne
I.; Liopo, Anton V.; Derry, Paul J.; Zubarev, Eugene R. (2017). Accelerating Gold Nanorod Synthesis with Nanomolar
Concentrations of Poly(vinylpyrrolidone). ACS Publications. Collection. https://doi.org/10.1021/acs.langmuir.7b02942
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AUTHORS (4)
KR
Katherinne
I. Requejo
AL
Anton V. Liopo
PD
Paul J. Derry
EZ
Eugene R. Zubarev