Hx. He et al., Fabrication of designed architectures of Au nanoparticles on solid substrate with printed self-assembled monolayers as templates, LANGMUIR, 16(8), 2000, pp. 3846-3851
This paper provides a convenient method for fabricating architectures of Au
nanoparticles on solid substrate,with precise position and density control
. Our strategy is to modify Au substrate with self-assembled monolayers (SA
Ms) terminated with different functional groups. They were chosen to be -CH
3/-NH2 or -CH3/-SH according to their affinities to Au nanoparticle. Au nan
oparticles assemble selectively on -NH2 or -SH terminated locations, the -N
H2 functional group binding electrostatically to the nanoparticles whereas
the -SH groups bonding chemically. The SAMs, acting as guiding templates fo
r Au nanoparticles, were fabricated by the microcontact printing (mu CP) te
chnique. A patterned or unpatterned SAM was prepared by using patterned or
unpatterned poly(dimethyl)siloxane (PDMS) stamp, respectively. The coverage
of -CH3 terminated SAM in the contact region is controlled by changing the
concentration of "ink" solution for the stamp. After immersing the printed
SAM into -SH or -NH2 thiol solutions for 2 h, a mixed SAM with a predeterm
ined coverage of -SH or -NH2 was formed in the contact regions, and a pure
-SH or -NH2 SAM was formed in the intervening area. The position and densit
y of nanoparticles on the surface were determined by the distribution of th
e underlying functional groups.