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:
New type of smart windows use liquid to switch from clear to reflective
14.12.2017 | The Optical Society
New ultra-thin diamond membrane is a radiobiologist's best friend
14.12.2017 | American Institute of Physics
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
14.12.2017 | Health and Medicine
14.12.2017 | Physics and Astronomy
14.12.2017 | Life Sciences