Uniform Arrays of ZnO 1D Nanostructures Grown on Al:ZnO Seeds Layers by Hydrothermal Method

Abstract

In obtaining uniform array of ZnO 1D nanostructures, especially using solution based methods, the thickness and the morphology of the epitaxial seeds layer are very important. The paper presents the effect of the thickness and the morphology of the Al:ZnO seeds layer on the morphology and properties of ZnO nanowires array grown by hydrothermal method. Compact and vertically aligned ZnO 1D nanostructures were obtained. Concentration of 0.02 M of zinc nitrate was found to be optimal for growing nanowires with diameters up to 50 nm and lengths between 1.5 and 2.5 microns. Using 0.04 M solution, nanorods with diameter between 50 and 100 nm were obtained. The correlation between the crystal structure and optical properties of ZnO nanowires is discussed. From electrical measurements on single nanowire, resistivity value of 9 x 10(-2) omega cm was obtained. The I-V curves of single ZnO NWs show quasi diode characteristic when an e-beam is irradiating the NWs, and a typical semiconductive behaviour when the e-beam is turned off.

Broadband enhanced fluorescence using zinc-oxide nanoflower arrays

“…5,6 ZnO forms a rich family of nanostructures including rodlike, belt-like, tube-like, and ower-like (urchin-like) morphologies. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] A wide range of both solution and vacuum deposition methods have been reported for fabricating the nanostructures, such as hydrothermal growth, 5,6,12,23 electro-deposition, 11 vapour-solid-condensation 20 and chemical vapour deposition. 8 ZnO nanostructures fabricated into ower-like arrays have been shown to have exceptional optical properties 19 and have been fabricated using different approaches, such as modied Kirkendall process, calcination of zinc metal powder, electrodeposition and hydrothermal growth.…”

1D Nanostructured ZnO Layers by Microwave - Assisted Hydrothermal Synthesis

“…When zinc oxide is obtained in nanostructured form with different morphologies such as nanorods, nanowires, nanoflowers, quantum dots, nanopetals [2,[4][5], it acquires new chemical, luminescent and optoelectronic properties due to increased surface to volume ratio and to their quantum confinement effect [2,[6][7]8], Zinc oxide nanomaterials can be obtained on glass substrate as well as on flexible and polymers smooth substrates by chemical and physical methods such as solgel, CVD, MOCVD, hydrothermal synthesis and thermal evaporation method [5,9]. In recent years, the hydrothermal method is one of the most used for synthesizing metal oxides nanostructures [6][7][10][11][12] because it provides good control over homogeneity, particle size, chemical composition, phase and morphology of the obtained products. The microwave-assisted hydrothermal synthesis of nanostructured materials has attracted attention by simplicity and efficiency, as well as the possibility of large-scale production of high quality nanostructures [13][14].…”