Supplementary Data
Figure Captions
Fig. S1 XRD of S-TiO2 NWs calcined at different temperature
Fig. S2 SEM images of S-TiO2 NWs
Fig. S3 HRTEM and SAED (inset) of S-TiO2 NWs calcined at 600 oC
Fig. S4 XPS of S-TiO2 NWs and NS-TiO2 NWs (a) S 2p; (b) N 1s; (c)Ti 2p;(d) O 1s
Fig. S5 BET of (a) NS-TiO2 NPs, (b) S-TiO2 NWs, and (c) NS-TiO2 NWs
Fig. S6 UV-vis spectrum of doped and undoped TiO2 NWs
Fig. S1
(A.U.)
9000
Intensity
10000
6000
A - a n a t a s e
B - T 2i( O
B )
8000
S - T2 i NO W s - 5 0 0
S - T2 i NO W s - 6 0 0
S - T2 i NO W s - 7 0 0
A ( 1 0 1 )
7000
A ( 0 0 4 )
5000
A ( 2 1 1 )
A ( 2 0 0 )
A ( 2 0 4 )
4000
A ( 1 0 5 )
3000
A ( 1 0 3A
) ( 1 1 2 )
2000
B ( 0 0 3 )
1000
0
10
15
20
25
30
35
B
40
45
degree(2θ）
50
55
60
65
70
Fig. S2
Fig. S3
Intensity/A.U.
Fig. S4
S
2p
1 6 4 . 6
N S - T2 iNOW s
1 6 4 . 7
S - T 2i O
N W s
170
168
166
164
162
Binding
160
158
energy/eV
(a)
Intensity/A.U.
N
408
1s
N S - T2 iNOW s
397.5
406
404
402
400
398
Binding
396
394
392
energy/eV
390
(b)
456.2
Ti
2p
Intensity/A.U.
N S - T2 i N
OW s
462.0
456.3
S - T 2i O
NWs
462.0
466
464
462
460
458
456
Binding
454
452
450
energy/eV
(c)
O 1s
527.5
527.4
Intensity/A.U.
NS-TiO2 NWs
529.4
527.5
527.4
S-TiO2 NWs
529.2
532
531
530
529
528
Binding energy/eV
(d)
527
526
525
Fig. S5
70
0 . 0 0 0 7
d V / d / Dg (, cn m
m )
3
60
50
40
Adsorbed
0 . 0 0 0 6
0 . 0 0 0 5
0 . 0 0 0 4
3
, Se T( P
)
v o l/ ug m
cm
80
0 . 0 0 0 3
0 . 0 0 0 2
0 . 0 0 0 1
0 . 0 0 0 0
30
10
20
30
40
50
60
P o r e
70
80
90
1 0 0
d i a m e t e r ( n m )
20
10
0
0 . 0
0 . 2
0 . 4
0 . 6
Relative
0 . 8
1 . 0
p r e 0s) s u r e ( P / P
(a)
90
0.0007
0.0006
70
0.0005
dV/dD(cm /g,nm)
60
0.0004
3
3
Adsorbed volume(cm /g,STP)
80
50
0.0003
0.0002
0.0001
40
0.0000
10
30
20
30
40
50
60
70
80
90
100
Pore diameter(nm)
20
10
0
0.0
0.2
0.4
0.6
Relative Pressure(P/P0)
0.8
1.0
(b)
80
0 .0 0 0 7
70
60
0 .0 0 0 5
0 .0 0 0 4
3
d V /d D (cm/g ,n m )
3
Adsorbed volume(cm /g,STP)
0 .0 0 0 6
50
40
0 .0 0 0 3
0 .0 0 0 2
0 .0 0 0 1
0 .0 0 0 0
30
10
20
30
40
50
60
70
80
90
100
X A xis T itle
20
10
0
0.0
0.2
0.4
0.6
0.8
1.0
Relative pressure(P/P0)
(c)
The surface area and porosity distribution of NS-TiO2 NPs, S-TiO2 NWs and NS-TiO2 NWs
calcined at 500 oC were investigated using nitrogen adsorption and desorption isotherms. The
isotherms of these three photocatalysts are typical type IV-like with a type H2 hysteretic loop,
which indicates the presence of mesoporous materials. The plot of the pore size distribution
(inset) was determined by using the Barrett-Joyner-Halenda (BJH) method from the desorption
branch of the isotherm. It shows that these three photocatalysts clearly have mesoporous
structure. The average pore diameter of NS-TiO2 NPs is about 25 nm and the BET surface area is
29.1 m2 g−1. The average pore diameter and the BET surface area of S-TiO2 NWs and NS-TiO2
NWs are about 35 nm, 22 nm and 39.8 m2 g−1, 35.1 m2 g−1, respectively.
Fig. S6
Absorbance(A.U.)
1.2
0.9
TiO2 NWs
S-TiO2 NWs
NS-TiO2 NWs
0.6
0.3
0.0
300
400
500
600
700
Wavelength(nm)
Fig. S6 exhibits the UV-vis absorption spectra of S-TiO2 NWs and NS-TiO2 NWs calcined at
600 oC compared to TiO2 NWs. A noticeable shift of the optical absorption edges of the doped
TiO2 toward the visible region of the solar spectrum was observed whereas pure TiO2 NWs has
no ability to respond to visible light. Obviously, this shift towards the longer wavelengths
originates from the band gap narrowing of titanium dioxide by sulfur doping or nitrogen/sulfur
codoping.