am7b08856_si_001.pdf (3.33 MB)
Confined Nucleation and Growth of PdO Nanocrystals in a Seed-Free Solution inside Hollow Nanoreactor
journal contribution
posted on 2017-08-25, 13:48 authored by Daun Kim, Jung Kyu Choi, Soo Min Kim, Ilha Hwang, Jaehyoung Koo, Seoyoung Choi, Seung Hwan Cho, Kimoon Kim, In Su LeeThis
paper reports a novel and adaptable hollow nanoreactor system containing
a solution of cucurbituril (CB) inside a silica nanoparticle (CB@h-SiO2) which enables the nucleation and formation
of nanocrystals (NCs) to be confined at the seed-free interior solution
inside the cavity. The above nanospace confinement strategy restricted
the volume of medium available for NC formation to the solution inside
the cavity to a few tens of nanometers in size and allowed homogeneous
NC nucleation to be examined. Harboring of CB@h-SiO2 in a Pd2+ complex solution confined the nucleation
and formation of PdO NCs to the well-isolated nanosized cavity protected
by the silica nanoshell, allowing the convoluted formation of clustered
PdO NCs to be thoroughly examined. The corresponding temporal investigation
indicated that PdO NC clusters evolved via a distinct pathway combining
dendritic growth on early nucleated seed NCs and attachment of small
intermediate clusters. In addition, the explored strategy was used
to fabricate a recyclable nanocatalyst system for selective catalytic
oxidation of cinammyl alcohols, featuring a cavity-included Fe3O4/PdO nanocomposite.