Abstract
Novel chemical synthesis method has been successfully employed for the preparation of n type α-Fe2O3 nanoparticles. Thin films of annealed Fe2O3 powders processed on glass substrates using spin coating technique. The effects of process temperature on the structural, morphological, electrical transport and optical properties were studied. X-ray diffraction study revealed formation of single phase nanocrystalline hexagonal α-Fe2O3. Microstructural analysis confirms nanostructured morphology. Dc electrical conductivity measurement reveled the semiconducting nature with room temperature electrical conductivity increased from 10−4 to 10−3 (Ω cm)−1 as process temperature of Fe2O3 increased from 400 to 700 °C respectively. The n-type electrical conductivity is confirmed from thermo-emf measurement with no appreciable change in thermoelectric power after increasing processing temperature. The decrease in the band gap energy from 3.88 to 2.62 eV was observed after increasing process temperature.
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R. Epherre, E. Duguet, S. Mornet, E. Pollert, S. Louguet, S. Lecommandoux, C. Schatz, G. Goglio, Manganite perovskite nanoparticles for self-controlled magnetic fluid hyperthermia: about the suitability of an aqueous combustion synthesis route. J. Mater. Chem. 21, 4393–4401 (2011)
J.B. Wacker, V.K. Parashar, M.A.M. Gijs, Anisotropic magnetic porous assemblies of oxide nanoparticles interconnected via silica bridges for catalytic application. Langmuir 27, 4380–4385 (2011)
S. Brulé, M. Levy, C. Wilhelm, D. Letourneur, F. Gazeau, C. Ménager, C.L. Visage, Doxorubicin release triggered by alginate embedded magnetic nanoheaters: a combined therapy. Adv. Mater. 23, 787–790 (2011)
M.K. Yu, Y.Y. Jeong, J. Park, S. Park, J.W. Kim, J.J. Min, K. Kim, S. Jon, Drug-loaded superparamagnetic iron oxide nanoparticles for combined cancer imaging and therapy in vivo. Angew. Chem. Int. Ed. 47, 5362–5365 (2008)
E. Valero, S. Tambalo, P. Marzola, M. Ortega-Muñoz, F.J. López-Jaramillo, F. Santoyo-González, J.D. de López, J.J. Delgado, J.J. Calvino, R. Cuesta, J.M. Domínguez-Vera, N. Gálvez, Magnetic nanoparticles-templated assembly of protein subunits: a new platform for carbohydrate-based MRI nanoprobes. J. Am. Chem. Soc. 133, 4889–4895 (2011)
A. Ethirajan, U. Wiedwald, H.-G. Boyen, B. Kern, L. Han, A. Klimmer, F. Weigl, G. Kästle, P. Ziemann, K. Fauth, J. Cai, R.J. Behm, A. Romanyuk, P. Oelhafen, P. Walther, J. Biskupek, U. Kaiser, A micellar approach to magnetic ultra-high density data storage media—extending the limits of current colloidal methods. Adv. Mater. 19, 406–410 (2007)
J. Dong, Z. Xu, S.M. Kuznicki, Magnetic multi-functional nano composites for environmental applications. Adv. Funct. Mater. 19, 1268–1275 (2009)
T.P. Raming, A.J.A. Winnubst, C.M. Kats, P.A. Philipse, The synthesis and magnetic properties of nanosized hematite (α-Fe2O3) particles. J. Colloid Interface Sci. 249, 346–350 (2002)
L.-S. Zhong, H. Jin-Song, H.-P. Liang, A.-M. Cao, W.-G. Song, L.-J. Wan, Self-assembled 3D flowerlike iron oxide nanostructures and their application in water treatment. Adv. Mater. 18, 2426–2431 (2006)
B. Wanga, H. Lv, H. Zhao, C. Zheng, Experimental and simulated investigation of chemical looping combustion of coal with Fe2O3 based oxygen carrier. Procedia Eng. 16, 390–395 (2011)
G. Wua, X. Tana, G. Li, C. Hu, Effect of preparation method on the physical and catalytic property of nanocrystalline Fe2O3. J. Alloy. Compd. 504, 371–376 (2010)
A.P. Morello, R. Burrill, E. Mathiowitz, Preparation and characterization of poly (methylmethacrylate)-iron (III) oxide microparticles using a modified solvent evaporation method. J. Microencapsul. 24, 476–491 (2007)
M. Cao, T. Liu, S. Gao, G. Sun, X. Wu, C. Hu, Z.L. Wang, Single-crystal dendritic micro-pines of magnetic α-Fe2O3: large scale synthesis, formation mechanism and properties. Angew. Chem. Int. Ed. 44, 2–6 (2005)
S.U. Sonavane, M.B. Gawande, S.S. Deshpande, A. Venkataraman, R.V. Jayaram, Chemoselective transfer hydrogenation reactions over nanosized γ-Fe2O3 catalyst prepared by novel combustion route. Catal. Commun. 8, 1803–1806 (2007)
P. Chauhan, S. Annapoorni, S.K. Trikha, Humidity-sensing properties of nanocrystalline hematite thin films prepared by sol–gel processing. Thin Solid Films 346, 266–268 (1999)
S.L. Patil, S.G. Pawar, A.T. Mane, M.A. Chougule, V.B. Patil, Nanocrystalline ZnO thin films: optoelectronic and gas sensing properties. J. Mater. Sci. Mater. Electron. 21, 1332–1336 (2010)
S.G. Pawar, M.A. Chougule, B.T. Raut, P.R. Godse, S.A. Pawar, S. Sen, V.B. Patil, Nanocrystalline TiO2 thin films: NH3 monitoring and physical characterization. J. Mater. Sci. Mater. Electron. 23, 273–279 (2012)
D.M. Jundale, P.B. Joshi, S. Sen, V.B. Patil, Nanocrystalline CuO thin films: synthesis, microstructural and optoelectronic properties. J. Mater. Sci. Mater. Electron. (2012). doi:10.1007/s10854-011-0616-2
M.A. Chougule, S.G. Pawar, P.R. Godse, R.D. Sakhare, S. Sen, V.B. Patil, Sol gel derived Co3O4 thin films: effect of annealing on structural, morphological and optoelectronic properties. J. Mater. Sci. Mater. Electron. 23(3), 772–778 (2012)
S.R. Nalage, M.A. Chougule, S. Sen, P.B. Joshi, V.B. Patil, Sol gel synthesis of nickel oxide thin films and their characterization. Thin Solid Films 520, 4835–4840 (2012)
S.L. Patil, S.G. Pawar, M.A. Chougule, S. Sen, V.B. Patil, Nanocrystalline ZnO thin films: Effect of annealing on microstructural and optoelectronic properties. J. Alloys Compd. 509, 10055–10061 (2011)
E. Comini, G. Faglia, G. Sberveglieri, Z. Pan, Z.L. Wang, Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts. Appl. Phys. Lett. 81, 1869–1871 (2002)
A. Studenikin, N. Golego, M. Cocivera, Fabrication of green and orange photoluminescent, undoped ZnO films using spray pyrolysis. J. Appl. Phys. 84, 2287–2294 (1998)
P.K. Ghosh, R. Maity, K.K. Chattopadhyay, Electrical and optical properties of highly conducting CdO:F thin film deposited by sol–gel dip coating technique. Sol. Energy Mater. Sol. Cells 81, 279–289 (2004)
K. Gurumurugan, D. Mangalaraj, S.K. Narayandass, Y. Nakanishi, DC reactive magnetron sputtered CdO thin films. Mater. Lett. 28, 307–312 (1996)
C.N.R. Rao, S.R.C. Vivekchand, K. Biswas, A. Govindaraj, Synthesis of inorganic nanomaterials. Dalton Trans. 34, 3728–3749 (2007)
S.G. Pawar, S.L. Patil, M.A. Chougule, V.B. Patil, Synthesis and characterization of nanocrystalline TiO2 thin films. J. Mater. Sci. Mater. Electron. 22, 260–264 (2011)
Y.K. Jeong, G.M. Choi, Nonstoichiometry and electrical conduction of CuO. J. Phys. Chem. Solids 57, 81–84 (1996)
B. Pejova, T. Kocareva, M. Najdoski, I. Grozdanov, A solution growth route to nanocrystalline nickel oxide thin films. Appl. Surf. Sci. 165, 271–278 (2000)
J.H. Lee, K.H. Ko, B.O. Park, Electrical and optical properties of ZnO transparent conducting films by the sol–gel method. J. Cryst. Growth 247, 119–125 (2003)
R. Hong, J. Huang, H. He, Z. Fan, J. Shao, Influence of different post-treatments on the structure and optical properties of zinc oxide thin films. Appl. Surf. Sci. 242, 346–352 (2005)
A.M. Chaparro, M.A. Martinez, C. Guillen, R. Bayon, J. Herrero, M.T. Gutierrez, SnO2 substrate effects on the morphology and composition of chemical bath deposited ZnSe thin films. Thin Solid Films 361–362, 177–182 (2000)
D. Bao, X. Yao, N. Wakiya, K. Shinozaki, N. Mizutani, Band-gap energies of sol–gel-derived SrTiO3 thin films. Appl. Phys. Lett. 79, 3767 (2001)
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Authors (VBP) are grateful to DAE-BRNS, for financial support through the scheme no.2010/37P/45/BRNS/1442.
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Navale, S.T., Bandgar, D.K., Nalge, S.R. et al. Novel process for synthesis of α-Fe2O3: microstructural and optoelectronic investigations. J Mater Sci: Mater Electron 24, 1422–1430 (2013). https://doi.org/10.1007/s10854-012-0944-x
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DOI: https://doi.org/10.1007/s10854-012-0944-x