SI-Nanoscale RSC Articles · 2011-03-14 · S3 Figure S2. TEM images of typical La 2(MoO 4)3...
Transcript of SI-Nanoscale RSC Articles · 2011-03-14 · S3 Figure S2. TEM images of typical La 2(MoO 4)3...
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Supplementary Material (ESI) for Nanoscale This journal is (c) The Royal Society of Chemistry 2011
Supplementary data
A General Procedure to Synthesize Highly Crystalline Metal Oxide and
Mixed Oxide Nanocrystals in Aqueous Medium and Photocatalytic
Activity of Metal/Oxide Nanohybrids
Thanh-Dinh Nguyen, Cao-Thang Dinh, and Trong-On Do*
Department of Chemical Engineering, Laval University, Quebec G1K 7P4 Canada
To whom correspondence should be addressed. E-mail: [email protected]
SUBMITTED TO Nanoscale - January 2011
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Wavelength (nm)
400 450 500 550 600
Inte
nsity (
a.u
.)
Wavelength (nm)
300 350 400 450 500
Inte
nsity (
a.u
.)
283
Emission
Excitation
(a) (b)
434
449
486
529 560
Figure S1. (a) UV-visible adsorption and (b) photoluminescence (PL) spectra of 5.0 mol%
Eu3+
:NdVO4 nanorods dispersion in water.
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Figure S2. TEM images of typical La2(MoO4)3 nanocrystals synthesized hydrothermally at 180 oC for
the different reaction times: (a) 2 h, (b) 6 h, and (c) 20 h. (d) Schematic illustration of the proposed
growth mechanism of the RE2(MoO4)3 nanosheets.
S4
Binding Energy (eV)
0 200 400 600 800 1000
Inte
nsity (
CP
S)
Binding Energy (eV)
390 393 396 399 402
Inte
nsity (
CP
S)
Binding Energy (eV)
284 286 288 290
Inte
nsity (
CP
S)
(a)
(c) (d)
Binding Energy (eV)
529 530 531 532 533In
ten
sity (
CP
S)
(b) O 1s
C 1sN 1s
O 1
s
Mo
3d
N 1
s
C 1
s
La
3d
C-C
C-NC-C=O
399.8
530.5
531.5
Figure S3. (a) Survey XPS spectrum and high-resolution (b) O 1s, (c) N 1s, (d) C 1s XPS spectra of
AHA-capped La2(MoO4)3 nanosheets.
S5
Wavenumber (cm-1
)
1000200030004000
Tra
nsm
itta
nce
(%
)
20
40
60
80
100
1385
(-C-N-)
2910 (-CH2-)
813 (-MoO4
3-)
3744 (-NH2)
Figure S4. FTIR spectrum of 6-aminohexanoic acid-capped La2(MoO4)3 nanosheets.
S6
2-theta (degree)
20 30 40 50 60
Inte
nsity (
a.u
.)
(a)
(b)
(c)
(d)
* *(e)
Ag
(11
1)
Ag
(20
0)
Ag JCPDS-74-1828*
Figure S5. XRD patterns of the synthesized 10.0 wt.% Ag/oxide hybrid NC samples: (a) Ag/TiO2
nanobels, (b) Ag/In2O3 nanorods, (c) Ag/Y2O3 nanorods, (d) Ag/ZrO2 nanorods, (e) Ag/CeO2
nanocubes. The marked with “*” is indexed to the deposited face-center-cubic (fcc) metallic Ag
structure; and the other remained peaks are contributed to the corresponding oxide structure.
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2-theta (degree)
20 30 40 50 60
Inte
nsity (
a.u
.)
(a)
(b)
(c)
(d)
*
# #
#
Au
(11
1)
Ag
(11
1)
Ag
(20
0)
*
Ag JCPDS-74-1828
Au JCPDS-01-1174
(e)
Figure S6. XRD patterns of the synthesized 10.0 wt.% Ag/mixed oxide and 10.0 wt.% Au/mixed
oxide NC samples: (a) Ag/CoWO4, (b) Ag/MnWO4, (c) Au/CoWO4, (d) Au/MnWO4, (e)
Au/La2(MoO4)3. The marked with “*” and “#” are indexed to deposited face-center-cubic (fcc)
metallic Ag and Au structures, respectively, and the other remained peaks are contributed to the
corresponding mixed oxide structure.
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Binding Energy (eV)
448 450 452 454 456 458 460
Inte
nsity (
CP
S)
Binding Energy (eV)
366 367 368 369 370
Inte
nsity (
CP
S)
Ag@TiO2
Pure Ag
Ti 2p
Ag 3d5/2367.7
368.0
(a)
(b)
Figure S7. (a) Ti 2p XPS spectra of 9.5 wt.% Ag/TiO2 nanohybrids; (b) Ag 3d XPS spectra of pure
9.5 wt.% Ag/TiO2 nanohybrids and pure Ag nanoparticles.
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Binding Energy (eV)
526 528 530 532 534
Inte
nsity (
CP
S)
Ti-O-Ti
HO-Ti
Figure S8. O 1s XPS spectrum of 9.5 wt.% Ag/TiO2 nanohybrids.
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0
1
2
3
0.0 0.2 0.4 0.6 0.8 1.0
Relative Pressure (P/Po )
Vo
lum
e A
ds
orb
ed
(m
l/g
)
Figure S9. Nitrogen adsorption-desorption of 9.5 wt.% Ag@TiO2 hybird nanobelts after annealing at
550 oC for 3 h.
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Wavelength (nm)
550 600 650 700 750
Ab
so
rba
nce
(a
.u.)
0.0
0.1
0.2
0.3
0.40 min
20 min
40 min
80 min
60 min
UV
irr
adia
tion
Irradiation Time (min)
0 20 40 60 80
C/C
o
0.0
0.2
0.4
0.6
0.8
1.0
Ag/TiO2 nanobels
TiO2 nanobels
P25
Ag/P25
B
A
Figure S10. (A) UV-vis absorption spectra of a methylene blue (MB) solution as a function of
irradiation time in the presence of 9.5 wt.% Ag/TiO2 hybrid NC catalyst and (B) comparison of the
MB photodegradation using TiO2 nanobels, commercial P25, 9.5 wt.% Ag/TiO2 hybrid NCs, and 9.5
wt.% Ag/P25 as photocatalysts.
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hv
Scheme S1. Proposed band structure and photocatalytic mechanism for light-induced charge
separation in Ag/TiO2 hybrid nanobelts.