Reported by Megawati Omar, Research Management Institute, UiTM
Researchers Mohd Zainizan Sahdan, Mohd Hafiz Mamat, Zuraida Khusaimi, Mohd Noor and Mohd Rusop Mahmud of the Faculty of Electrical Engineering and the Faculty of Applied Sciences, UiTM invented a method to obstruct gas flow in the 2-furnace CVD system to synthesize ZnO nanowires. ZnO nanowires can be synthesized using 2-furnace chemical vapour deposition (CVD) system but the gas flow is an important parameter for the nanowire synthesis as it is challenging to deposit ZnO nanowires it.
These researchers invented and placed a gas blocker at the end of the precursor furnace to obstruct the gas flow. Argon gas with ZnO vapour would hit the gas blocker and it would flow back to the opposite direction. Since Argon gas flowing from left was stronger, with a gold catalyst, it would repel to flow back onto the glass substrate. ZnO microball then would be formed and due to high energy, ZnO nanowires grew on the ZnO microball. High density of ZnO nanowires were synthesized by the gas blocker in the Catalytic Thermal CVD.
In the experiment, this gas blocker controlled a better flow of gas. ZnO nanowires on ZnO microballs were deposited on a glass substrate with high density and repeatability. The Ultra Violet-Visible (UV-Vis) spectrometer showed that ZnO nanowires had high absorption in the UV region which is an important criterion for solar cell applications. The photoluminescence study indicated that ZnO nanowires exhibited a strong excitation in the UV region which is suitable for UV laser diode applications.
Blocking the gas offers a better control of gas flow. Other that that, the fabricated ZnO nanowires has high UV absorption, thus the invention will be useful for light harvesting devices such as solar cells. As ZnO nanowires have strong UV emission, it is also good for light emitting devices such as laser diodes. Lastly, it offers strong impact on the physical and optical properties of ZnO nanowires.Contact for further information:
Climate cycles may explain how running water carved Mars' surface features
02.12.2016 | Penn State
What do Netflix, Google and planetary systems have in common?
02.12.2016 | University of Toronto
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water
In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...
The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
02.12.2016 | Medical Engineering
02.12.2016 | Agricultural and Forestry Science
02.12.2016 | Physics and Astronomy