Sonochemical approach for rapid growth of zinc oxide nanowalls

Date

2012-06-01

Author

Nayak, Avinash P.
Katzenmeyer, Aaron M.
Gosho, Yasuhiro
Tekin, Bayram
Islam, M. Saif

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

45
views

0
downloads

The sonochemical process drives chemical reactions with sound fields by creating extraordinarily high density of energy, pressure and temperatures. The process resulted in a number of unexpected chemical species and thought-provoking results in the recent past. In this paper, we present a new sonochemical approach to synthesize ZnO (zinc oxide) nanowalls (NWalls) on aluminum and alumina coated substrates at room ambient conditions. We achieved highly dense and uniform ZnO NWalls in areas that are coated with Al or Al2O3 (alumina). The synthesis process was shown not to occur on Si, SiO2, Cr, or Ag surfaces. A series of experiments on understanding the growth kinetics offers detailed insight into the growth dynamics over time. Photoluminescence (PL) measurements, UV Vis spectroscopy, and SEM-EDS results confirm NWalls composed of crystalline ZnO that are formed via Al assisted growth induced by phase transformations under extraordinary pressure, temperature, and chemical growth kinetics. The chemical growth method as reported here, is applicable to arbitrary substrates coated with an Al thin film. We demonstrate the applications of the as-formed NWalls in UV photoconductors and gas sensors.

Subject Keywords

ZNO, Mechanisms, Pressure, Kinetics, Powders, System, ZNO, Field, AL2O3

URI

https://hdl.handle.net/11511/35249

Journal

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

DOI

https://doi.org/10.1007/s00339-012-6823-8

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Diffusion in Hypersonic Flows Gür, Hilmi Berk; Eyi, Sinan (Nova Science Pub Inc, 2020-10-01) In hypersonic flows, air goes into chemical reaction due to high temperature. Therefore, in addition to the Navier-Stokes Equations, chemical reaction equations need to be solved to analyze hypersonic flows. A model may be need to simulate the diffusion phenomena among chemical species. It is possible to implement Fick's Law of Diffusion as well as Stefan-Maxwell Diffusion Equation. Basically, in Fick's Law of Diffusion, the driving force is the species concentration differences. This method is similar to t...
Rheological characterization of tahin/pekmez (sesame paste/concentrated grape juice) blends Arslan, E; Yener, Meryem Esra; Esin, A (2005-07-01) Rheological properties of tahin/pekmez blends were determined at different tahin concentrations (20-32%) and temperatures (35-65 degrees C) by using a concentric cylinder rotational viscometer. Tahin/pekmez blends were found to exhibit non-Newtonian, shear thinning behavior at all temperatures and tahin concentrations. Apparent viscosity versus shear rate data was successfully fitted to the power-law model. The flow behavior index, n varied in the range of 0.7-0.85. The consistency coefficient, K, was in th...
Numerical and experimental investigation of forced filmwise condensation over bundle of tubes in the presence of noncondensable gases Ramadan, Abdul-Ghani M; Yamalı, Cemil; Department of Mechanical Engineering (2006) The problem of the forced film condensation heat transfer of pure steam and steam-air mixture flowing downward a tier of horizontal cylinders is investigated numerically and experimentally. Liquid and vapor-air mixture boundary layers were solved by an implicit finite difference scheme. The effects of the free stream non-condensable gas (air) concentration, free stream velocity (Reynolds number), cylinder diameter, temperature difference and angle of inclination on the condensation heat transfer are analyze...
A review on microwave baking of foods Şümnü, Servet Gülüm (Wiley, 2001-02-01) Microwaves interact with polar molecules and charged particles of food to generate heat. There are differences between the heating mechanisms of microwave and conventional heating. The use of microwave heating has the advantage of saving energy and time, improving both nutritional quality and acceptability of some foods by consumers. Microwave ovens are successfully used both in homes and in the food service industry. However, there are still problems in perfecting microwave baking, therefore it is a popula...
Near-field radiative transfer in spectrally tunable double-layer phonon-polaritonic metamaterials Didari, Azadeh; Elçioğlu, Elif Begüm; Okutucu Özyurt, Hanife Tuba; Mengüç, M. Pinar (Elsevier BV, 2018-6) Understanding of near-field radiative transfer is crucial for many advanced applications such as nanoscale energy harvesting, nano-manufacturing, thermal imaging, and radiative cooling. Near-field radiative transfer has been shown to be dependent on the material and morphological characteristics of systems, the gap distances between structures, and their temperatures. Surface interactions of phononic materials in close proximity of each other has led to promising results for novel near-field radiative trans...

Citation Formats

A. P. Nayak, A. M. Katzenmeyer, Y. Gosho, B. Tekin, and M. S. Islam, “Sonochemical approach for rapid growth of zinc oxide nanowalls,” APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, pp. 661–667, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35249.