Synthesis of ZnO Nanorods by Laser Ablation of ZnO and Zn Targets in He and O₂ Background Gas

Abstract

A new continuous impingement mixing process has been used to disperse unpurified single-walled carbon nanotubes (SWNTs) in a Shell EPON-862/EpiCURE system. Composites with up to 0.2 wt% loading of SWNTs were prepared by this process. The hydrodynamic dispersion of SWNTs was found to depend on the non-dimensional Curtet number (C t ). Dispersion was evaluated by analyzing SEM images of the fracture surface using an image processing technique based on the concept of Shannon entropy. Electrical conductivity of these composites was greatly enhanced when compared with the plain material. The behavior of electrical conductivity as a function of dispersion was found to be in accordance with results from the image processing technique, and was also used to estimate the sedimentation of SWNTs.

Optical and Field-Emission Properties of ZnO Nanostructures Deposited Using High-Pressure Pulsed Laser Deposition

“…This behavior can be attributed to the low lattice mismatch between ZnO and GaN. Okada et al have also shown the change in morphology and orientation of ZnO nanostructures with respect to substrates . This implies that the morphologies of ZnO nanostructures can be tuned during growth by utilizing the lattice mismatch between the substrate and film.…”

“…Among them, ZnO nanostructures, which have a bandgap of 3.37 eV and an exciton binding energy of 60 meV, have potential applications in nanoelectronics , nano-optelectronics , nanopiezotronics , gas/chemical sensors , transparent electrodes , and field emission devices . Various forms of ZnO nanostructures, including nanorods , , nanowalls , nanowires , nanobelts , and quantum dots , have been reported using physical and chemical deposition techniques. In comparison with ZnO nanorods/wires, the growth of two-dimensional (2D) ZnO nanowalls are difficult due to its polar structure along the c -axis.…”

Low-temperature photoluminescence of phosphorous-doped ZnO nanowires synthesized by nanoparticle-assisted pulsed-laser deposition

“…However, only few efforts have been made to employ this method in the synthesis of nanostructured ZnO crystals such as nanowires. We have successfully grown nondoped ZnO nanowires by a newly developed nanoparticle-assisted pulsedlaser deposition (NAPLD) technique that does not require the use of any catalyst [6][7][8][9]. And we also found and demonstrated that these crystals had good crystallinity from low-temperature photoluminescence (PL) measurements [10,11].…”

“…EXPERIMENTAL PROCEDURE P-doped ZnO nanowire crystals were synthesized by the newly developed NAPLD technique [6][7][8][9]. Sintered ZnO tablets mixed with 5 or 2 wt% P 2 O 5 were used as the source material for the synthesis of P-doped ZnO nanowires.…”

Synthesis and characterization of layer structured ZnO nanowire for ultraviolet light-emitting diode

“…The first is control of nanowire growth direction, shape, density, and position etc. In our study, we have succeeded in synthesizing various nanostructures, such as the vertically and horizontally aligned ZnO nanowires [23][24][25] nanorods [26][27][28][29] , and nanowalls [30] by nanoparticle-assisted pulsed-laser deposition (NAPLD) without any catalyst. Besides, the density-controlled growth of vertically aligned ZnO nanowires has been successfully achieved by varying substrate -target distance, repetition rate, and laser energy [25] .…”