Zinc Oxide Quantum Rods

Abstract

Nanoscale zinc oxide (ZnO) rods of diameters close to the Bohr-exciton radius ( approximately 2 nm) can be prepared from a simple acetate precursor, resulting in ligand-capped rods of ZnO, highly dispersible in nonpolar solvents. Zinc oxide, ZnO, is a wide band-gap semiconductor with applications in blue/ultraviolet (UV) optoelectronic devices and piezoelectric devices. We observe self-assembly into uniform stacks of nanorods aligned parallel to each other with respect to the long axis, and photoluminescence measurements provide evidence for one-dimensional quantum confinement.

One-dimensional ZnO nanostructures: Solution growth and functional properties

“…These ultrathin nanowires also self-assembled into uniform stacks of nanowires aligned parallel to each other with respect to the long axis [71]. Near-UV absorption and photoluminescence measurements were able to determine that quantum confinement effects were present in these ultrathin nanowires, with an excitonic ground state of about 3.55 eV [71]. The ultrathin nanowires were possibly grown by oriented coalescence of quantum dots, as shown in Fig.…”

“…3(a) [71]. These ultrathin nanowires also self-assembled into uniform stacks of nanowires aligned parallel to each other with respect to the long axis [71].…”

“…That is also the reason that why after growth the bulk solution and reaction container usually remained clear without any precipitation. As the reaction proceeded, Zn 2+ was gradually [71]. (b) TEM image of the ultrathin nanowire formed by orientational aggregation of several quantum dots [72].…”

Multicolor Luminescence from Semiconductor Nanocrystal Composites Tunable in an Electric Field

“…Numerous techniques have recently been developed to synthesize quasi-1D ZnO nanostructures, (Baranov et al 2004;Liu et al, 2004;Xia et al, 2003;Yang et al, 2002;Yao et al, 2002;Yin et al, 2004;Wang et al, 2004; including growth with or without catalysts by a vapour-liquid-solid epitaxial (VLS) mechanism (Yang et al, 2002;Yao et al, 2002;Wang et al, 2004), microwave plasma growth and solution methods Yin et al, 2004). An important issue in the fabrication of nanostructures is the control of the shape and size of nanomaterials, both of which affect their optical and electrical properties.…”

Genetically Modified Collagen‐like Triple Helix Peptide as Biomimetic Template THIS CHAPTER HAS BEEN RETRACTED

“…ZnO has a wide bandgap (3.37 eV) and possesses unique optical, acoustic, catalytic, and electronic properties, which makes ZnO one of the most widely studied semiconductors in the application of solar cells, sensors, ultraviolet nanolasers, catalyst, transparent conductor, piezoelectric materials, and short-wavelength light-emitting devices. [70][71][72][73] It requires the fabrication of morphologically and functionally distinct ZnO nanostructures. While recently various methods have been published to grow ZnO in various shapes at near room temperature, there have been no reports on controlling the size and monodispersity of ZnO nanowires at temperatures lower than room temperature.…”