Total views : 384
A Comparative Analysis of the Properties of Zinc Oxide (ZnO) Nanoparticles Synthesized by Hydrothermal and Sol-Gel Methods
Objective: To study the structural, optical and conductivity properties of ZnO nanoparticles synthesized by two different methods such as hydrothermal and sol-gel methods. Methods/Analysis: ZnO is synthesized at various temperatures 100oC, 150oC and 200oC using hydrothermal method with oxalic acid and zinc acetate and using sol-gel method with sodium hydroxide, zinc chloride and zinc nitrate. Findings: For both methods, the average crystal size determined by X-ray Diffraction (XRD) is noted to be in the range 20–30 nm. The pattern confirmed the composition, crystallinity and the synthesized products are ZnO with high purity and the hexagonal phase. The absorption peak of ZnO nanoparticles has a blue-shift compared with that of the bulk. In hydrothermal method, the band gap is large (i.e) from 4.4–4.9 eV and in the sol-gel method 3.5–3.9 eV. ZnO nanoparticles synthesized by both methods exhibit similar luminescence. Scanning Electron Microscopy (SEM) pictures reveal the morphology as near-spherical prismatic nano particles for hydrothermal method and as nanoflakes for sol-gel method. The Energy Dispersive X-ray Spectroscopy (EDAX) analysis confirms the presence of ZnO only and no other element. The conductivity decreases with the growth temperature as well as the concentration of the ZnO samples by sol-gel method. In contrast, the conductivity of the sample prepared by hydrothermal method, increases with the growth temperature but decreases with the concentration. Novelty: In addition, conductivity of the synthesized ZnO nanoparticles is measured for various concentrations of ZnO. The results of both the methods are compared with each other and with those reported in the literature.
Conductivity, EDAX, PL, SEM, XRD, ZnO.
- Sridevi D, Rajendran KV. Synthesis and optical characteristics of ZnO nanocrystals. Bulletin of Materials Science. 2009; 32(2):165-8.
- Savi BM, Rodrigues L, Bernardin AM. Synthesis of ZnO nanoparticles by sol-gel processing. Qualicer ’12. 2012. p. 1-8.
- Aneesh PM, Vanaja KA, Jayaraj MK, Synthesis of ZnO nanoparticles by hydrothermal method. Proceedings of SPIE, India. 2007; 66390J:1-9.
- Sivakumar S, Venkateswarlu P, Rao VR,Rao GN. Synthesis, characterization and optical properties of zinc oxide nanoparticles. International Nano Letters. 2013; 3(30):1-6.
- Bagabas A, Alshammari A, Aboud MF, Kosslick H. Room-temperature synthesis of Zinc Oxide nanoparticles in different media and their application in cyanide photodegradation. Nanoscale Research Letters. 2013; 8:516.
- Ha TT, Canh TD, Tuyen NV. A quick process for synthesis of ZnO nanoparticles with the aid of microwave irradiation. ISRN Nanotechnology. 2013; Article ID 497873:1-7.
- Oladiran AA, Olabisi IA. Synthesis and Characterization of ZnO nanoparticles with Zinc Chloride as Zinc source. Asian Journal of Natural and Applied Sciences. 2:41.
- Hale PS, Maddox LM, Shapter JG, Voelcker NH, Ford MJ, Waclawik ER. 2005, Growth Kinetics and Modeling of ZnO nanoparticles. Journal of Chemical Education. 2013; 82:775.
- Kolekar TV, Yadav HM, Bandgar SS, Deshmukh PY. Synthesis by Sol-gel Method and characterization of ZnO nanoparticles. Indian Streams Research Journal. 2011; 1:1.
- Gnanasangeetha D, Sarala Thambavani D. One pot synthesis of ZnO nanoparticles via Chemical and Green method. Research Journal of Material Sciences. 2013; 1:1.
- Kundu TK., Karak N, Barik P, Saha S. Optical properties of ZnO nanoparticles prepared by Chemical method using Polyvinyl Alcohol (PVA) as capping agent. International Journal of Soft Computing and Engineering. 2011; 1:19.
- Vaseem M, Umar A, Hahn YB. ZnO nanoparticles: Growth, properties and applications. Metal Oxide Nanostructures and Their Applications, 2010; 5:1-36.
- Radzimska AK, Jesionowski T. Zinc Oxide – From synthesis to application: A review. Materials. 2014; 7:2833.
- Suwanboon S. Structural and optical properties of nanocrystalline ZnO powder from Sol-Gel Method. ScienceAsia. 2008; 34:31.
- Thangeeswari T, George AT, Arun Kumar A. Optical properties and FTIR studies of cobalt doped ZnO nanoparticles by simple solution method. Indian Journal of Science and Technology. 2016; 9(1).
- Vanaja A, Ramaraju GV, Rao KS. Structural and optical investigation of Al doped ZnO nanoparticles synthesized by sol-gel process. Indian Journal of Science and Technology. 2016; 9(12).
- Xu CL, Qin DH, Li H, Guo Y, Xu T, Li HL. Low temperature growth and optical properties of radial ZnO nanowires. Materials Letters. 2004; 58:3976.
- Vanheusden K, Warren WL, Seager CH, Tallant DR, Voigt JA, Gnade BE. Mechanisms behind Green Photoluminescence in ZnO phosphor powders. Journal of Applied Physics. 1996; 79:7983.
- There are currently no refbacks.
This work is licensed under a Creative Commons Attribution 3.0 License.