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Supporting Information
Selective Synthesis of WO3 and W18O49 Nanostructures: Ligand-free pH-Dependent Morphology Controlled Self-assembly of Hierarchical Architecture from 1D Nanostructure and Sunlight-driven Photocatalytic Degradation
Y. M. Shirke and S. Porel-Mukherjee
Fig. S1. UV-VIS-NIR profile comparison between products W-1.5, W-1.76 & W-2.05 and W-2.05 showing an absorption tail in the NIR region that may arise from the presence of oxygen vacancy.
500 1000 1500 2000 2500
W-2.05
W-1.76W-1.5
Abso
rban
ce
Wavelength (nm)
Electronic Supplementary Material (ESI) for CrystEngComm.This journal is © The Royal Society of Chemistry 2017
Fig. S2. FTIR spectrum of the as-prepared W-1.5 and W-2.05.
4000 3500 3000 2500 2000 1500 1000 500
W-1.5
W-2.05
Tran
smitt
ance
Wavenumber/cm-1
W-O
O-W-O
Fig. S3. N2 adsorption/desorption isotherms for (a) W-0.95, (b) W-1.5, (c) W-1.76, (d) W-2.05 and (e) W-2.35.
0.0 0.2 0.4 0.6 0.8 1.0
0
20
40
60
80
100Vo
lum
e @ST
P(cc
/g)
Relative pressure (p/p0)
(a)
0.0 0.2 0.4 0.6 0.8 1.0
0
40
80
120
160
Volu
me @
STP(
cc/g
)
Relative pressure (p/p0)
(b)
0.0 0.2 0.4 0.6 0.8 1.0
0
40
80
120
160
Volu
me @
STP(
cc/g
)
Relative pressure(p/p0)
(c)
0.0 0.2 0.4 0.6 0.8 1.0
0
20
40
60
80
100
120
140
Volu
me @
STP(
cc/g
)
Relative pressure (p/p0)
(d)
0.0 0.2 0.4 0.6 0.8 1.0
0
40
80
120
160
200
Volu
me @
STP(
cc/g
)
Relative pressure (p/p0)
(e)
Fig. S4. SEM images of the products (a) W-0.95, (b) W-1.5, (c) W-1.76, (d) W-2.05 and (e) W-2.35. Scale bar = 3 m
(a) (b) (c)
(d) (e)
Fig. S5. TEM images and the corresponding ED pattern (inset) of the products (a) W-0.95, (b) W-1.5, (c) W-1.76, (d) W-2.05 and (e) W-2.35; with reference WO3 (hkl = white colour) and W18O49 (hkl = blue colour).
(b)
001002
003
220221
312
(a)221 001
002003
(e)
010
(d)
010020
030
(c)
200
201020
221
010101
100
Fig. S6. Full range XPS spectra of (a) W-1.5 and (b) W-2.05
1200 1000 800 600 400 200 0
Inte
nsity
(a.u
.)
Binding Energy (eV)
W4f
O1s
(a)
1200 1000 800 600 400 200 0
Inte
nsity
(a.u
.)
Binding Energy (eV)
W4f
O1s
(b)
Fig. S7. Raman spectra obtained at laser power 20 mW for the products (a) W-0.95, (b) W-1.5, (c) W-1.76, (d) W-2.05 and (e) W-2.35.
200 300 400 500 600 700 800 9000
2000
4000
6000
8000
10000
12000
14000
Ram
an In
tens
ity
Wavenumber/cm-1
(a)
200 300 400 500 600 700 800 9000
1000
2000
3000
4000
5000
6000
7000
8000
Ram
an In
tens
ity
Wavenumber/cm-1
(b)
200 300 400 500 600 700 800 9000
500
1000
1500
2000
2500
Ram
an In
tens
ity
Wavenumber/cm-1
(c)
200 300 400 500 600 700 800 9000
500
1000
1500
2000
2500
Ram
an In
tens
ity
Wavenumber/cm-1
(e)
200 400 600 8000
500
1000
1500
2000
Ram
an In
tens
ity
Wavenumber/cm-1
(d)
200 nm
Fig. S8. (a) SEM and (b) TEM image of product W-2.35 disassembled by aqueous ultrasonication under a long treatment time.
(a) (b)
Fig. S9. The change observed in UV-Vis absorbance spectra in the presence of (a) W-1.5 and (b) W-2.05 under sunlight irradiation for different times.
400 500 600 7000.0
0.5
1.0
Wavelength (nm)
0 min 1 min 2 min 5 min 7 min 10 min 15 min 30 min
(b)
400 500 600 7000.0
0.5
1.0
1.5Ab
sorb
ance
Wavelength(nm)
0 min 1 min 2 min 5 min 7 min 10 min 15 min 30 min 45 min 60 min
(a)