Chemistry Reference
In-Depth Information
Table 11 (continued)
AuNC ion
Surface
Key findings
References
Au
x
+
(1
<
x
20) MgO(100)
Low-temperature oxidation of CO was
studied. SL NCs of Au
x
,Pt
x
,Pd
x
and Rh
x
were compared. Rh
20
showed the highest
reactivity
[
350
]
Au
x
+
(
x
¼
1,2,
3,4,7)
TiO
2
(110)
Au
7
NCs are
50 times more reactive in
catalysing CO oxidation than samples
prepared by Au or Au
2
deposition.
18
O
2
and mass spectrometry were used to
analyse desorbed C
16
O, C
18
O and
16
OC
18
O. A lack of C
18
O formation
highlights that CO does not decompose
on the AuNCs
>
[
351
]
Au
8
+
MgO(100)
Oxide support defects play a key role in
enhancing cluster reactivity for the oxi-
dation of CO
[
352
]
Au
17
+
Graphite
Sub-monolayer films of size-selected Au
clusters present binding sites to stabilise
individual protein molecules and com-
plexes for single-molecule
measurements
[
353
]
Au
x
+
(
x
¼ 2-10)
Sputter-damaged
HOPG
Oxidation of the SL AuNCs by atomic oxy-
gen was studied as a function of cluster
size. The resultant oxides were allowed
to react with CO. Only Au
8
shows sig-
nificant reactivity
[
354
]
Au
x
+
(
x
¼ 2-10)
Silica
An additional Au atom can significantly
change the oxidation of SL AuNCs by
atomic oxygen. Au
5
and Au
7
are resistant
to oxidation
[
355
]
Au
x
+
(
x
¼
5-8)
Silica
SL AuNCs were first treated with either
water or NaOH, and their oxidation by
atomic oxygen was then studied
Water has no effect, while oxidation resis-
tant Au
5
and Au
7
become more reactive
towards oxidation upon treatment with
NaOH
[
356
]
Au
x
+
(
x
¼
6-10)
Amorphous
alumina
SL AuNCs catalyse the epoxidation of
propene. The highest selectivity for
epoxide formation over acrolein forma-
tion was found for gas mixtures involv-
ing oxygen and water, thereby
circumventing the use of hydrogen
[
357
]
Au
20
+
MgO(100)
The role of the thickness and stoichiometry
of the MgO films on the catalytic activity
of SL Au
20
towards CO oxidation was
examined. Theoretical calculations were
used to probe the mechanism of CO
oxidation
[
358
]
a
L
¼
1,3-bis(diphenylphosphino)propane, different self-assembled monolayers on gold (SAMs)
were used: 1
H
,1
H
,2
H
,2
H
-perfluorodecanethiol (FSAM); 16-mercaptohexadecanoic acid (COOH-
SAM); 1-dodecanethiol (HSAM)
This table is adapted from [
334
]
