Back to Search Start Over

Ultrafast, Controllable Synthesis of Sub-Nano Metallic Clusters through Defect Engineering

Authors :
Yao, Yonggang
Huang, Zhennan
Xie, Pengfei
Li, Tangyuan
Lacey, Steven D.
Jiao, Miaolun
Xie, Hua
Fu, Kun Kelvin
Jacob, Rohit Jiji
Kline, Dylan Jacob
Yang, Yong
Zachariah, Michael R.
Wang, Chao
Shahbazian-Yassar, Reza
Hu, Liangbing
Source :
ACS Applied Materials & Interfaces; August 2019, Vol. 11 Issue: 33 p29773-29779, 7p
Publication Year :
2019

Abstract

Supported metallic nanoclusters (NCs, < 2 nm) are of great interests in various catalytic reactions with enhanced activities and selectivities, yet it is still challenging to efficiently and controllably synthesize ultrasmall NCs with a high-dispersal density. Here we report the in situ synthesis of surfactant-free, ultrasmall, and uniform NCs via a rapid thermal shock on defective substrates. This is achieved by using high-temperature synthesis with extremely fast kinetics while limiting the synthesis time down to milliseconds (e.g., ∼1800 K for 55 ms) to avoid aggregation. Through defect engineering and optimized loading, the particle size can be robustly tuned from >50 nm nanoparticles to <1 nm uniform NCs with a high-dispersal density. We demonstrate that the ultrasmall NCs exhibit drastically improved activities for catalytic CO oxidation as compared to their nanoparticulated counterparts. In addition, the reported method shows generality in synthesizing most metallic NCs (e.g., Pt, Ru, Ir, Ni) in an extremely facile and efficient manner. The ultrafast and controllable synthesis of uniform, high-density, and size-controllable NCs paves the way for the utilization and nanomanufacturing of NCs for a range of catalytic reactions.

Details

Language :
English
ISSN :
19448244
Volume :
11
Issue :
33
Database :
Supplemental Index
Journal :
ACS Applied Materials & Interfaces
Publication Type :
Periodical
Accession number :
ejs50688159
Full Text :
https://doi.org/10.1021/acsami.9b07198