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Doping iodine in CdS for pure hexagonal phase, narrower band gap, and enhanced photocatalytic activity

  • Zhihui Ai (a1), Man Wang (a1), Zhi Zheng (a2) and Lizhi Zhang (a3)


Iodine-doped CdS (I-CdS) with controllable morphologies, pure hexagonal phase, and enhanced photocatalytic activity was synthesized via a mild hydrothermal process with polyvinylpyrrolidone-iodine (PVP-I) acting as the template-directing reagent and iodine source. The morphologies of the as-prepared samples could be adjusted from irregular cone-shaped particles to uneven microspheres, further to smooth microspheres, while the crystal phases were also transformed from mixed cubic and hexagonal phases to pure hexagonal phase upon increasing the molar ratio of PVP-I to Cd2+ from 0 to 2. The iodine doping could result in red shift of the absorption edges and band gap narrowing of the I-CdS samples. Importantly, a critical point of 0.5 of molar ratio of PVP-I to Cd2+ for iodine doping was found to be necessary for obtaining a pure hexagonal phase that facilitates the improving of photocatalytic activity on the degradation of Rhodamine B in aqueous solution under visible light irradiation.


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1.Kamat, P.V.: Meeting the clean energy demand: Nanostructure architectures for solar energy conversion. J. Phys. Chem. C 111, 2834 (2007).
2.Huynh, W.U., Dittmer, J.J., and Alivisatos, A.P.: Hybrid nanorod-polymer solar cells. Science 295, 2425 (2002).
3.Colovin, V.L., Schlamp, M.C., and Alivisatos, A.P.: Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer. Nature 370, 354 (1994).
4.Coe, S., Woo, W.K., Bawendi, M., and Bulovic, V.: Electroluminescence from single monolayers of nanocrystals in molecular organic devices. Nature 420, 800 (2002).
5.Duan, X.F., Huang, Y., Agarwal, R., and Lieber, C.M.: Single-nanowire electrically driven lasers. Nature 421, 241 (2003).
6.Peng, T.Y., Zhao, D., Dai, K., Shi, W., and Hirao, K.: Synthesis of titanium dioxide nanoparticles with mesoporous anatase wall and high photocatalytic activity. J. Phys. Chem. B 109, 4947 (2005).
7.Pore, V., Ritala, M., Leskela, M., Areva, S., Jarn, M., and Jarnstrom, J.: H2S modified atomic layer deposition process for photocatalytic TiO2 thin films. J. Mater. Chem. 17, 1361 (2007).
8.Kubacka, A., Colon, G., and Fernandez-Garcia, M.: Cationic (V, Mo, Nb, W) doping of TiO2-anatase: A real alternative for visible light-driven photocatalysts. Catal. Today 143, 286 (2009).
9.Jang, J.S., Joshi, U.A., and Lee, J.S.: Solvothermal synthesis of CdS nanowires for photocatalytic hydrogen and electricity production. J. Phys. Chem. C 111, 13280 (2007).
10.Jing, D.W. and Guo, L.J.: A novel method for the preparation of a highly stable and active CdS photocatalyst with a special surface nanostructure. J. Phys. Chem. B 110, 11139 (2006).
11.Yao, W.T., Yu, S.H., Liu, S., Chen, J.J.P., Liu, X.M., and Li, F.Q.: Architectural control syntheses of CdS and CdSe nanoflowers, branched nanowires, and nanotrees via a solvothermal approach in a mixed solution and their photocatalytic property. J. Phys. Chem. B 110, 11704 (2006).
12.Peng, X.G., Schlamp, M.C., Kadavanich, A.V., and Alivisatos, A.P.: Epitaxial growth of highly luminescent CdSe/CdS core/shell nanocrystals with photostability and electronic accessibility. J. Am. Chem. Soc. 119, 7019 (1997).
13.Empedocles, S.A., Neuhauser, R., Shimizu, K., and Bawendi, M.G.: Photoluminescence from single semiconductor nanostructures. Adv. Mater. 11, 1243 (1999).
14.Yu, W.W., Qu, L.H., Guo, W.Z., and Peng, X.G.: Experimental determination of the extinction coefficient of CdTe, CdSe, and CdS nanocrystals. Chem. Mater. 15, 2854 (2003).
15.Cheng, Y., Wang, Y.S., Bao, F., and Chen, D.Q.: Shape control of monodisperse CdS nanocrystals: Hexagon and pyramid. J. Phys. Chem. B 110, 9448 (2006).
16.Gao, F., Lu, Q.Y., Xie, S.H.D., and Zhao, Y.: A simple route for the synthesis of multi-armed CdS nanorod-based materials. Adv. Mater. 14, 1537 (2002).
17.Shen, G.Z. and Lee, C.: CdS multipod-based structures through a thermal evaporation process. Cryst. Growth Des. 5, 1085 (2005).
18.Zhao, P.T. and Huang, K.X.: Multipod-based structures through a thermal evaporation process. Cryst. Growth Des. 8, 717 (2008).
19.Zhang, B.H., Jian, J.K., Zheng, Y.F., Sun, Y.F., Chen, Y.H., and Cui, L.: Low temperature hydrothermal synthesis of CdS submicro- and microspheres self-assembled from nanoparticles. Mater. Lett. 62, 1827 (2008).
20.Du, T. and Ilegbusi, O.J.: Synthesis and morphological characterization on PVP/ZnO nanohybrid films. J. Mater. Sci. 39, 6105 (2004).
21.Wu, Y.D., Wang, L.S., Xiao, M.W., and Huang, X.J.: A novel sonochemical synthesis and nanostructured assembly of polyvinylpyrrolidone-capped CdS colloidal nanoparticles. J. Non-Cryst. Solids 354, 2993 (2008).
22.Jing, C.B., Xu, X.G., Zhang, X.L., Liu, Z.B., and Chu, J.H.: In situ synthesis and third-order nonlinear optical properties of CdS/PVP nanocomposite films. J. Phys. D: Appl. Phys. 42, 075402 (2009).
23.Wang, Q.Q., Zhao, G.L., and Han, G.R.: Synthesis of single crystalline CdS nanorods by a PVP-assisted solvothermal method. Mater. Lett. 59, 2625 (2005).
24.Li, G.C., Jiang, L., Peng, H.R., and Zhang, B.: Self-assembled cadmium sulfide microspheres from nanorods and their optical properties. Mater. Lett. 62, 1881 (2008).
25.Su, W.Y., Zhang, Y.F., Li, Z.H., Wu, L., Wang, X.X., Li, J.Q., and Fu, X.Z.: Multivalency iodine doped TiO2: Preparation, characterization, theoretical studies, and visible-light photocatalysis. Langmuir 24, 3422 (2008).
26.Liu, G., Sun, C.H., Yan, X.X., Cheng, L.N., Chen, Z.G., Wang, X.W., Wang, L.Z., Smith, S.C., Lu, G.Q., and Cheng, H.M.: Iodine-doped anatase TiO2 photocatalyst with ultra-long visible light response: Correlation between geometric/electronic structures and mechanisms. J. Mater. Chem. 19, 2822 (2009).
27.Xiong, Y.S., Zhang, J., Huang, F., Ren, G.Q., Liu, W.Z., Li, D.S., Wang, C., and Lin, Z.: Growth and phase-transformation mechanisms of nanocrystalline CdS in Na2S solution. J. Phys. Chem. C 112, 9229 (2008).
28.Bao, N.Z., Shen, J.M., Takata, T., Domen, K., Gupta, A., Yanagisawa, K., and Crimes, C.A.: Facile Cd-thiourea complex thermolysis synthesis of phase-controlled CdS nanocrystals for photocatalytic hydrogen production under visible light. J. Phys. Chem. C 111, 17527 (2007).
29.Cao, H.Q., Wang, G.Z., and Zhang, S.C.: Growth and optical properties of wurtzite-type CdS nanocrystals. Inorg. Chem. 45, 5103 (2006).
30.Chu, M.Q. and Liu, L.: Synthesis of CdS nanocrystals controlled by polyvinyl pyrrolidine matrix at room temperature. Mater. Technol. 20, 153 (2005).
31.Wang, M., Ai, Z.H., and Zhang, L.Z.: Generalized preparation of porous nanocrystalline ZnFe2O4 superstructures from zinc ferrioxalate precursor and its superparamagnetic property. J. Phys. Chem. C 112, 13163 (2008).
32.Ryu, S.Y., Balcerski, W., Lee, T.K., and Hoffmann, M.R.: Photocatalytic production of hydrogen from water with visible light using hybrid catalysts of CdS attached to microporous and mesoporous silicas. J. Phys. Chem. C 111, 18195 (2007).
33.Kale, B.B., Baeg, J.O., Apte, S.K., Sonawane, R.S., Naik, S.D., and Patil, K.R.: Confinement of nano CdS in designated glass: A novel functionality of quantum dot-glass nanosystems in solar hydrogen production. J. Mater. Chem. 17, 4297 (2007).
34.Grzelczak, M., Sánchez-Iglesias, A., Rodríguez-González, B., Alvarez-Puebla, R., Pérez-Juste, J., and Liz-Marzán, L.M.: Influence of iodide ions on the growth of gold nanorods: Tuning tip curvature and surface plasmon resonance. Adv. Funct. Mater. 18, 1 (2008).
35.Li, X.H., Li, H.B., Li, G.D., and Chen, J.S.: Preparation, characterization and photocatalytic performance of Nd3+-doped titania nanoparticles with mesostructure. Inorg. Chem. 48, 3132 (2009).
36.Xiang, G.L., Zhuang, J., and Wang, X.: Morphology-controlled synthesis of inorganic nanocrystals via surface reconstruction of nuclei. Inorg. Chem. 48, 10222 (2009).
37.Kossel, W., Nachr, G. and Wiss, G.: Zur Theorie des Kristallwachstums. Math.-Phys. Kl. 135 (1927).
38.Hartman, P. and Perdok, W.G.: On the relations between structure and morphology of crystals: III. Acta Crystallogr. 8, 525 (1955).
39.He, J.F., Liu, Q.H., Sun, Z.H., Yan, W.S., Zhang, G.B., Qi, Z.M., Xu, P.S., Wu, Z.Y., and Wei, S.Q.: High photocatalytic activity of rutile; TiO2 induced by iodine doping. J. Phys. Chem. C 114, 6035 (2010).
40.Sing, K.S.W., Everett, D.H., Haul, R.A.W., Moscou, L., Pierotti, R.A., Rouquerol, J., and Siemieniewska, T.: Reporting physisorption data for gas solid systems with special reference to the determination of surface-area and porosity. Pure Appl. Chem. 57, 603 (1985).
41.Zhang, X., Zhang, L.Z., Xie, T.F., and Wang, D.J.: Low-temperature synthesis and high visible-light-induced photocatalytic activity of BiOI/TiO2 heterostructures. J. Phys. Chem. C 113, 7371 (2009).
42.Ohtani, B., Ogawa, Y., and Nishimoto, S.I.: Mathematical modeling of free-radical polymerization fronts. J. Phys. Chem. B 101, 3746 (1997).


Doping iodine in CdS for pure hexagonal phase, narrower band gap, and enhanced photocatalytic activity

  • Zhihui Ai (a1), Man Wang (a1), Zhi Zheng (a2) and Lizhi Zhang (a3)


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