Enhanced Catalytic Activity of Self-Assembled-Monolayer-Capped Gold Nanoparticles
作者:Tomoya Taguchi、Katsuhiro Isozaki、Kazushi Miki
DOI:10.1002/adma.201202979
日期:2012.12.18
An unprecedented substrate-selective catalytic enhancement effect of an alkanethiol-self-assembled monolayer (SAM) on Au nanoparticles (AuNPs) is reported. In the supported 2D-array of AuNPs, the alkanethiol-SAM acts as a protein-like soft reaction space in which the substrate molecules are encapsulated through non-covalent intermolecular hydrophobic interactions, and thus catalytic reactions are accelerated at AuNP surfaces.
Highly Efficient Etherification of Silanes by Using a Gold Nanoparticle Catalyst: Remarkable Effect of O<sub>2</sub>
O2 is acting! A nanosized hydroxylapatite‐supported Au nanoparticle (NP) catalyst exhibited high activity under aerobic conditions, and various silyl ethers could be obtained from diverse combinations of silanes with alcohols. Moreover, O2 was found to act not as a stoichiometric oxidizing reagent, but as a non‐consumed promoter, significantly boosting the catalytic activity of AuNPs (see figure).
O 2正在表演!纳米羟基磷灰石负载的金纳米颗粒(NP)催化剂在好氧条件下表现出高活性,并且可以通过硅烷与醇的各种组合获得各种甲硅烷基醚。此外,发现O 2并不是化学计量的氧化剂,而是非消耗型促进剂,从而大大增强了AuNPs的催化活性(见图)。