Direct synthesis of ZnO nanowire arrays on Zn foil by a simple thermal evaporation process

Abstract

ZnO nanowire arrays were synthesized on zinc foil by a simple thermal evaporation process at relatively low temperature. Morphology and size controlled synthesis of the ZnO nanostructures was achieved by variation of the synthesis temperature, reaction time and the surface roughness of the substrate. A gas-solid and self-catalytic liquid-solid mechanism is proposed for the growth of nanowires at different temperatures. High-resolution transmission electron microscopy (HRTEM) showed that the as-grown nanowires were of single crystal hexagonal wurtzite structure, growing along the [101] direction. Photoluminescence exhibited strong UV emission at ∼382 nm and a broad green emission at ∼513 nm with 325 nm excitation. Raman spectroscopy revealed a phonon confinement effect when compared with results from bulk ZnO. The nanowire arrays also exhibited a field emission property.

Fabrication, characterization of ZnO nanorods on the flexible substrate (Kapton tape) via chemical bath deposition for UV photodetector applications

“…Zinc oxide with a large and direct band gap of 3.37 eV and wide exciton binding energy of 60 eV at room temperature are deem the highly sensitive and most promising materials for sensors because of their slow electron/hole recombination rate, faster response, higher optical gain, high surface-to-volume ratio and specific crystalline orientation [4]. There are different experimental techniques to fabricate the ZnO nanorods such as thermal evaporation [5], filtered vacuum arc deposition (FVAD) [6], metal organic vapor phase epitaxy [7], pulsed laser deposition [8], vapor transport deposition [9], electrospinning [10] and metal organic chemical vapor deposition [11] etc. Among these methods the chemical bath deposition method is extremely attractive due to its advantageous features over other thin film deposition techniques, such as its simple, low temperature, low cost, low evaporation temperature and easy coating of large surfaces [12].…”

Preparation of Flower-like ZnO Nanoparticles in a Cellulose Hydrogel Microreactor

“…Generally, the shape, size, and crystalline structure of semiconductors determine their chemical and physical properties. Zinc oxide materials have been prepared with different sizes and morphologies, such as spheres (Deng et al 2008), flower-like shapes (Zhao et al 2007), tubes (Li et al 2008), cages, prismatic shapes, ellipsoidal shapes, hollow shells (Yu and Yu 2008), dumbbell shapes, nanowires (Ghoshal et al 2008), nanorods (Cui et al 2009), and nano-bundles (Muruganandham and Wu 2008). Various methods yield the large variety of shapes, sizes, and crystalline forms, as well as differing optical properties (Colón et al 2008).…”

Electron–phonon interaction in zinc oxide. Plasmon–optical phonon coupled modes

“…Three families of curves { },{ },{ } ω ω ω are obtained. This case would be physically important in interpreting Raman scattering or IR absorption experimental results on ZnO micron-sized particles obtained by chemical synthesis methods [20]. The particles would have a random orientation of the optical axis with respect the normal at the surface, covering continuously the interval (0, π/2).…”