CuO nanorods were synthesised on a large scale via a simple hydrothermal method. CuCl2·2H2O and cetyltrimethylammonium bromide (CTAB) were used as the copper source and surfactant, respectively. The microstructure and morphology of the CuO nanorods were examined by X-ray diffraction, Raman spectrum, field-emission scanning electron microscopy, transmission electron microscopy (TEM) and UV-vis spectrum. The CuO nanorods were monoclinic, and their diameter and length ranged from 20 to 30 nm and 150 to 200 nm, respectively. High resolution TEM and selected area electron diffraction results indicated that the CuO nanorods grow along the  direction. A possible growth mechanism for the formation of CuO nanorods was proposed. The concentration of surfactant CTAB in the solution was found to be a critical factor on the CuO morphology during the hydrothermal stage. The bandgap of the CuO nanorods was calculated to be 2.01 eV from the UV-vis spectrum.
"Moreover, interest in nanorods of various metals had arisen as well. For example, copper oxide nanorods had been produced by Liu et al. and Cheng , who were motivated by potential applications of copper oxide nanorods in solar and electrochemical cells. While their methods have potential for the production of copper oxide nanorods on surfaces, scalable solution-based methods that produce monodisperse and well-dispersed copper (Cu) nanorods is still a topic of significant importance in fundamental studies and commercial applications. "
[Show abstract][Hide abstract] ABSTRACT: In the past decade spherical and rod-like viruses have been used for the design and synthesis of new kind of nanomaterials with unique chemical positioning, shape, and dimensions in the nanosize regime. Wild type and genetic engineered viruses have served as excellent templates and scaffolds for the synthesis of hybrid materials with unique properties imparted by the incorporation of biological and organic moieties and inorganic nanoparticles. Although great advances have been accomplished, still there is a broad interest in developing reaction conditions suitable for biological templates while not limiting the material property of the product.
We demonstrate the controlled synthesis of copper nanorods and nanowires by electroless deposition of Cu on three types of Pd-activated rod-like viruses. Our aqueous solution-based method is scalable and versatile for biotemplating, resulting in Cu-nanorods 24-46 nm in diameter as measured by transmission electron microscopy. Cu2+ was chemically reduced onto Pd activated tobacco mosaic virus, fd and M13 bacteriophages to produce a complete and uniform Cu coverage. The Cu coating was a combination of Cu0 and Cu2O as determined by X- ray photoelectron spectroscopy analysis. A capping agent, synthesized in house, was used to disperse Cu-nanorods in aqueous and organic solvents. Likewise, reactions were developed to produce Cu-nanowires by metallization of polyaniline-coated tobacco mosaic virus.
Synthesis conditions described in the current work are scalable and amenable for biological templates. The synthesized structures preserve the dimensions and shape of the rod-like viruses utilized during the study. The current work opens the possibility of generating a variety of nanorods and nanowires of different lengths ranging from 300 nm to micron sizes. Such biological-based materials may find ample use in nanoelectronics, sensing, and cancer therapy.
Journal of Nanobiotechnology 05/2012; 10(1):18. DOI:10.1186/1477-3155-10-18 · 4.12 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Nanoscale metal oxide materials have been attracting much attention because of their unique size- and dimensionality-dependent physical and chemical properties as well as promising applications as key components in micro/nanoscale devices. Cupric oxide (CuO) nanostructures are of particular interest because of their interesting properties and promising applications in batteries, supercapacitors, solar cells, gas sensors, bio sensors, nanofluid, catalysis, photodetectors, energetic materials, field emissions, superhydrophobic surfaces, and removal of arsenic and organic pollutants from waste water. This article presents a comprehensive review of recent synthetic methods along with associated synthesis mechanisms, characterization, fundamental properties, and promising applications of CuO nanostructures. The review begins with a description of the most common synthetic strategies, characterization, and associated synthesis mechanisms of CuO nanostructures. Then, it introduces the fundamental properties of CuO nanostructures, and the potential of these nanostructures as building blocks for future micro/nanoscale devices is discussed. Recent developments in the applications of various CuO nanostructures are also reviewed. Finally, several perspectives in terms of future research on CuO nanostructures are highlighted.
[Show abstract][Hide abstract] ABSTRACT: In the present work a wet chemical method has been employed for the synthesis of self-assembled 1-D polycrystalline nanochains of CuO. The Zetasizer, AFM, FESEM and TEM results show that in the grown sample the CuO nanoparticles become organized to form chain like structures. These chains have an average size of NPs and chain length of similar to 25 +/- 7 nm and 495 +/- 135 nm, respectively. The CuO nanochains have a band gap of 2.7 eV and upon 340 nm irradiation exhibit a characteristic fluorescence spectrum peaking at 410 nm along with two shoulders at higher (390 nm, 3.2 eV) and lower energies (440 nm, 2.8 eV). The fluorescence lifetime is observed to increase with the decreasing energy of emission. These nanostructures exhibit three red shifted Raman bands at 286, 335 and 619 cm(-1), compared to the bulk CuO. The magnetic measurements show a weak ferromagnetic interaction at room temperature which is enhanced further at lower temperatures associated with an exchange bias effect (H-eb = 290 Oe) and spin glass like behavior (at 56 K). At room temperature CuO nanochains demonstrate a weak ferroelectric behavior along with a high dielectric constant of the order of >10(3) at low frequency. The optical, Raman and magnetic measurements suggest a relatively stronger quantum confinement and the presence of defects in the as synthesized CuO nanochains. Morphological changes leading to the creation of defects appear to be responsible for the observed changes in their optical, magnetic and ferroelectric properties. The correlation between the morphology and the observed optical, magnetic and ferroelectric properties of the samples has been analyzed.
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