10.1021/acsami.5b05633.s001
Zi-en Liu
Zi-en
Liu
Jie Wang
Jie
Wang
Yan Li
Yan
Li
Xiaoxia Hu
Xiaoxia
Hu
Junwen Yin
Junwen
Yin
Yeqing Peng
Yeqing
Peng
Zhihao Li
Zhihao
Li
Yawen Li
Yawen
Li
Baomin Li
Baomin
Li
Quan Yuan
Quan
Yuan
Near-Infrared Light Manipulated
Chemoselective Reductions Enabled by an Upconversional Supersandwich
Nanostructure
American Chemical Society
2015
luminescence intensity
chemical synthesis
upconversion quantum
CeO 2 nanoparticles
catalyst displays
NIR light irradiation
chemical reaction
multifunctional nanostructures
nitro compounds
supersandwich structure
silica layer
azo compounds
2015-09-02 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Near_Infrared_Light_Manipulated_Chemoselective_Reductions_Enabled_by_an_Upconversional_Supersandwich_Nanostructure/2135797
Core–satellite
is one of the most powerful superstructures since it leads to enhanced
or completely new properties through compatible combination of each
component. Here we create a novel ceria-based core–shell–satellite
supersandwich structure with near-infrared (NIR) light manipulated
catalytic activity by integrating the upconversion luminescent and
catalytic functionality of CeO<sub>2</sub> nanoparticles. Specifically,
lanthanide-doped octahedral CeO<sub>2</sub> nanoparticles (o-CeO<sub>2</sub>) are coated with silica layer (o-CeO<sub>2</sub>@SiO<sub>2</sub>) to enhance their luminescence intensity. The pH-dependent
catalytic active cubic CeO<sub>2</sub> nanoparticles (c-CeO<sub>2</sub>) are then assembled on the surface of o-CeO<sub>2</sub>@SiO<sub>2</sub> to form the supersandwich structure (o-CeO<sub>2</sub>@SiO<sub>2</sub>@c-CeO<sub>2</sub>) following a classic chemical reaction.
The upconversion quantum yield of o-CeO<sub>2</sub> in this nanostructure
can be nearly doubled. Furthermore, under NIR light irradiation, the
o-CeO<sub>2</sub>@SiO<sub>2</sub>@c-CeO<sub>2</sub> supersandwich
structure based composite catalyst displays superior catalytic activity
in selective reduction of aromatic nitro compounds to corresponding
azo compounds, and the composite photocatalyst can be easily recycled
for several times without significant loss of catalytic activity.
This strategy may serve as a universal method for the construction
of multifunctional nanostructures and shed light on the green chemistry
for chemical synthesis.