Effect of reducing agents on the structure of zinc oxide under microwave irradiation

Abstract

Zinc oxide was synthesized from zinc sulphate using different reducing agents under microwave irradiation. The influence of sodium borohydride, hydrazine hydrate and urea on the shape and size of the products were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). SEM showed the nano-sized spherical and rectangular shaped structures in case of sodium borohydride and hydrazine hydrate, whereas micro-sized hexagonal structures were formed in case of urea under the same irradiation power. The reducing agents played an important role in forming the various structures. Thus different shapes and size of structures were produced by only varying the reducing agent, which had wide applications in various fields.

Keywords

Zinc oxide / Microwave / Sodium borohydride / Hydrazine hydrate / Urea

References

[1] Bitenc M, Orel ZC. Synthesis and characterization of crystalline hexagonal bipods of zinc oxide. Mater Res Bull, 2009, 44: 381-387.

[2] Peiro AM, Ravirajan P, Govender K, et al. Hybrid polymer/metal oxide solar cells based on ZnO columnar structures. J Mater Chem, 2006, 16: 2088-2096.

[3] Srikanth CK, Jeevanandam P. Effect of anion on the homogeneous precipitation of precursors and their thermal decomposition to zinc oxide. J Alloy Compd, 2009, 486(1–2): 677-684.

[4] Ada K, Goekgoez M, Oenal M, et al. Preparation and characterization of a ZnO powder with the hexagonal plate particles. Powder Technol, 2008, 181: 285-291.

[5] Cheng C, Liu B, Yang H, et al. Hierarchical assembly of ZnO nanostructures on SnO₂ backbone nanowires: low-temperature hydrothermal preparation and optical properties. ACS Nano, 2009, 3: 3069-3076.

[6] Baruah S, Dutta J. Hydrothermal growth of ZnO nanostructures. Sci Technol Adv Mater, 2009, 10(1): 013001.

[7] Ram SDG, Kulandainathan MA, Ravi G. On the study of pH effects in the microwave enhanced rapid synthesis of nano-ZnO. Appl Phys A, 2010, 99: 197-203.

[8] Lima SAM, Cremona M, Davolos MR, et al. Electroluminescence of zinc oxide thin-films prepared via polymeric precursor and via sol-gel methods. Thin Solid Films, 2007, 516: 165-169.

[9] Music S, Popovic S, Maljkovic M, et al. Influence of synthesis procedure on the formation and properties of zinc oxide. J Alloy Compd, 2002, 347: 324-332.

[10] Peiro AM, Domingo C, Peral J, et al. Nanostructured zinc oxide films grown from microwave activated aqueous solutions. Thin Solid Films, 2005, 483: 79-83.

[11] Jiang JY, Li YF, Tan SW, et al. Synthesis of zinc oxide nanotetrapods by a novel fast microemulsion-based hydrothermal method. Mater Lett, 2010, 64: 2191-2193.

[12] Mo M, Yu JC, Zhang LZ, et al. Self-assembly of ZnO nanorods and nanosheets into hollow microhemispheres and microspheres. Adv Mater, 2005, 17: 756-760.

[13] Wei A, Sun XW, Xu CX, et al. Growth mechanism of tubular ZnO formed in aqueous solution. Nanotechnology, 2006, 17: 1740-1744.

[14] Chen DR, Jiao XL, Cheng G. Hydrothermal synthesis of zinc oxide powders with different morphologies. Solid State Commun, 1999, 113: 363-366.

[15] Lu CH, Yeh CH. Influence of hydrothermal conditions on the morphology and particle size of zinc oxide powder. Ceram Int, 2000, 26: 351-357.

[16] He Y, Yang B, Cheng G. On the oxidative coupling of methane with carbon dioxide over CeO/ZnO nanocatalysts. Catal Today, 2004, 98: 595-600.

[17] Glaspell G, Dutta P, Manivannan A. A room-temperature and microwave synthesis of M-doped ZnO (M = Co, Cr, Fe, Mn & Ni). J Cluster Sci, 2005, 16(4): 523-526.

[18] Hamedani NF, Farzaneh F. Synthesis of ZnO nanocrystals with hexagonal (wurtzite) structure in water using microwave irradiation. J Sci Islam Repub Iran, 2006, 17(3): 231-234.

[19] Krishnakumar T, Pinna N, Kumari KP, et al. Microwave-assisted synthesis and characterization of tin oxide nanoparticles. Mater Lett, 2008, 62(19): 3437-3440.