Sol Gel Preparation of Ta 2 O 5 Nanorods Using DNA as Structure Directing Agent
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Sol Gel Preparation of Ta2O5 Nanorods using DNA as Structure Directing Agent Humberto A. Monreala, Alberto M. Villafañea, José G. Chacóna, Perla E. Garcíab and Carlos A. Martínezb a División de Deterioro de Materiales, Centro de Investigación en Materiales Avanzados S.C.; Miguel de Cervantes # 120 Complejo Industrial Chihuahua. Cd. Chihuahua, Chih. México, C.P. 31109. b Departamento de Ciencias Básicas, Instituto de Ingeniería y Tecnología, Universidad Autónoma de Ciudad Juárez. Ave. Del Charro # 450 Norte, Cd. Juárez, Chih. México. A.P. 1594-D ABSTRACT Transition metal oxides are being considered as the next generation materials in field such as electronics and advanced catalysts; between them is Tantalum (V) Oxide; however, there are few reports for the synthesis of this material at the nanometer size which could have unusual properties. Hence, in this work we present the synthesis of Ta2O5 nanorods by sol gel method using DNA as structure directing agent, the size of the nanorods was of the order of 40 to 100 nm in diameter and several microns in length; this easy method can be useful in the preparation of nanomaterials for electronics, biomedical applications as well as catalysts. Keywords: Nanomaterials, sol-gel chemistry, DNA template. INTRODUCTION Recent progress in the synthesis and characterization of nanowires and nanorods has been driven by the need to understand the novel physical properties of onedimensional (1-D) nanomaterials, and their potential applications in constructing nanoscale electronic and optoelectronic devices [1]. Nanostructured materials of transition-metal oxides such as tantalum, titanium, and vanadium oxides are generally accepted as the next generation materials in fields such as electronics[2-5], and advanced catalysts[6,7]. Tanatalum (V) oxide has attracted considerable attention in microelectronics due to its dielectric constant for use in integrated capacitors[8], in advances catalysts [9], storage energy[10]. Also, nanoparticles of Ta2O5 has been used as biomaterials in filled resins because its properties like low toxicity due to its high state oxidation, chemical inertness, biocompatibility, radiopacity and in nanometer sized translucent[11,12]. Despite its several potential applications there are few reports for the preparation of Ta2O5 at nanometer scale. These few reports include the use of organogelators as structure directing agent for the preparation of nanotubes[14]. Chan et. al. prepared nanoparticles of Ta2O5 by a non aqueous condensation of tantalum ethoxide [13]. The electrostatic and topographic properties of the DNA molecule can also be used for the templated synthesis of supramolecular aggregates of inorganic and organic building blocks [14]. An early example of this approach was reported by Gibbs et al.[15] who demonstrated that porphyrin derivatives that contain cationic side chains (e.g. 19), form long-range structures on a DNA template, There has been reported others works to obtain nanomaterials using DNA as template [16-20] but
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