%0 Journal Article
%A Zhou, Le
%A Zhang, Hongwen
%A Bao, Haoming
%A Liu, Guangqiang
%A Li, Yue
%A Cai, Weiping
%D 2018
%T Decoration of Au Nanoparticles on MoS2 Nanospheres:
From Janus to Core/Shell Structure
%U https://acs.figshare.com/articles/journal_contribution/Decoration_of_Au_Nanoparticles_on_MoS_sub_2_sub_Nanospheres_From_Janus_to_Core_Shell_Structure/6099494
%R 10.1021/acs.jpcc.8b01216.s001
%2 https://acs.figshare.com/ndownloader/files/10989644
%K MoS 2 nanospheres
%K MoS 2 NPs
%K HAuCl 4 addition amount
%K decoration
%K Janus particles
%K MoS 2 spheres
%K HAuCl 4
%K surfactant-induced uniform distribution
%K MoS 2 nanoplates
%K sodium dodecyl benzene sulfonate
%K MoS 2 Nanospheres
%K hydrothermal reaction-induced MoS 2
%K MoS 2 particles
%K ultrafine NPs
%X A flexible
route is presented for the controlled decoration of
the Au nanoparticles (NPs) on the spherical MoS2 particles,
just by dropping the HAuCl4 aqueous solution into the hydrothermal
reaction-induced MoS2 colloidal solution at room temperature.
In the absence of surfactants in the colloidal solution, it has been
found that the obtained products are mostly the MoS2/Au
Janus particles, in which the hemispherical Au particles are separately
attached on the single MoS2 spheres about 100 nm in size.
The hemispherical Au particles are built of the ultrafine NPs (<10
nm) and comparable to the MoS2 spheres in size. Further
experiments have revealed that the existence of surfactants in the
colloidal solution could significantly influence the distribution
and decoration of Au NPs on the MoS2 nanospheres. When
the MoS2 colloidal solution contains the nonionic or anionic
surfactant, such as poly(vinylpyrrolidone) and sodium dodecyl benzene
sulfonate, in appropriate content, the addition of HAuCl4 induces the Au ultrafine NPs highly uniformly attached or decorated
on the MoS2 spheres. The distribution of the Au ultrafine
NPs on the MoS2 spheres evolves from a dispersed decoration
to the intact core/shell structure with the rising HAuCl4 addition amount. However, the cationic surfactant could prevent
Au NPs from decoration on the MoS2 spheres and induce the
self-agglomeration of Au NPs. The formation of MoS2/Au
Janus particles is attributed to the aggregation growth of Au ultrafine
NPs on the MoS2 spheres, whereas the dispersed decoration
of Au ultrafine NPs on the MoS2 spheres is ascribed to
the surfactant-induced uniform distribution of Au NPs. Interestingly,
such decorated spherical MoS2 NPs have exhibited a much
higher surface-enhanced Raman scattering effect than the decorated
MoS2 nanoplates. This work presents a simple approach to
the controllable decoration of Au NPs on the spherical MoS2 particles.
%I ACS Publications