Selective Synthesis of WO3 and W18O49 …Supporting Information Selective Synthesis of WO3 and...
Transcript of Selective Synthesis of WO3 and W18O49 …Supporting Information Selective Synthesis of WO3 and...
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)