Enhanced wave absorption of nanocomposites based on the synthesized CuS complex symmetrical nanostructure and poly(vinylidene fluoride). Shuai Hea ...
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A This journal is © The Royal Society of Chemistry 2013
Supporting Information Enhanced wave absorption of nanocomposites based on the synthesized CuS complex symmetrical nanostructure and poly(vinylidene fluoride) Shuai Hea, Guang-Sheng Wanga*, Chang Lua, Jia Liub,Bo Wenb, Huan Liua, Lin Guoa* and Mao-Sheng Caob*
To study the optical properties of the synthesized nanocrystals, UV–Vis absorption and photoluminescence have been studied extensively. Figure Sa shows the UV–Vis absorption spectrum of the complex geometrical symmetry CuS structures. A broad and strong absorption, which was reported in early research 1, can be found in the detected range from 400 to 800 nm. It indicates that the complex geometrical symmetry CuS nanostructures lead to the broadening of optical absorption, which can be used in the field of solar cell. The photoluminescence (PL) spectrum of the complex geometrical symmetry CuS nanostructures is present in Figure Sb, Under the photoluminescent excitation of 324 nm there are two emissions peaks: one is at about 427 nm, which is similar with the PL of CuS nanowires; 2 the other is at about 525 nm, which is different from reported that there was no emission peak for CuS in the range of 400–800 nm by the Jiang et al.
3
Such variation in PL
intensity can be explained in terms of the size effect of the products, which in turn accounts for the increase in the content of surface oxygen vacancy and defects with a decrease in the size of materials
4
and is in agreement with other workers on other
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A This journal is © The Royal Society of Chemistry 2013
nanomaterials.
5
However, the possibility of improvement in PL intensity due to
higher crystallinity of the product cannot be ruled out. 6
Absorbance(a.u)
(a)
400
500 600 700 Wavelength(nm)
800
Intensity(a.u)
(b)
300 400 500 600 700 800 900 1000 Wavelength(nm)
Fig. S1 (a) UV–Vis absorption spectrum of and (b) PL spectrum of the complex geometrical symmetry CuS nanostructures.
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A This journal is © The Royal Society of Chemistry 2013
Fig. S2 SEM imagine of CuS/PVDF nanocomposite with a loading of 10wt%.
Imaginary part of permittivity('')
(a) 7 a segment of the third semicircle
6
a segment of the 5 first semicircle 4
a segment of the second semicircle
3 2 6
7
8
9
10
11
Real part of permittivity(')
12
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A This journal is © The Royal Society of Chemistry 2013
Imaginary part of permittivity('')
(b) 22 21
a segment of the third semicircle
20 19
a segment of the first semicircle
18 17 16
a segment of the second semicircle
15 14 15
20
25
30
35
Real part of permittivity(')
Fig. S3 CuS/PVDF nanocomposites with a loading of (a)5 wt% and (b) 20 wt%
References 1. Wu C Y, Yu S H, Antonietti M, 2006 Chem. Mater. 18 3599. 2. Zhang F, Wong S S, 2009 Chem. Mater. 21 4541. 3. Jiang X C, Xie Y, Lu J, He W, Zhu L Y, Qian Y T, 2000 J. Mater. Chem. 10 2193. 4. Jing L Q, Qu Y C, Wang B Q, Li S D, Jiang B J, Yang L B, Fu W, Fu H G, Sun J Z, 2006 Sol. Energy Mater. Sol. Cells 90 1773. 5. Zhou J G, Zhao F Y, Wang X, Li Z Q, Zhang Y, Yang L, 2006 J. Lumin. 237 119. 6. Wan J X, Wang Z H ,Chen X Y, Mu L, Qian Y T, 2005 J. Cryst. Growth 284 538.
