The copper thin film was grown using atomic sputtering epitaxy and then the mechanism behind its strong oxidation-resistance was revealed using theoretical models
CREDIT: Pusan National University
The atomically flat copper thin films suppress the growth of copper oxides on their surface
Copper (Cu) is of fundamental importance to our daily lives due to its excellent electrical conductivity, as well as other valuable physical properties, such as the ability to draw copper into thin wires. Cu is the metal that is at the heart of the electronics, semiconductor and electro-optics industry. But oxidation and unwanted corrosion on its surface can limit the lifespan and increase the electrical resistance of Cu. Now, a team of researchers led by Prof. Se-Young Jeong from Pusan National University have developed a way to fabricate oxidation-resistant thin films of copper. “Oxidation-resistant Cu could potentially replace gold in semiconductor devices, which would help bring down their costs. Oxidation-resistant Cu could also reduce electrical consumption, as well as increase the lifespan of devices with nanocircuitry,” says Prof. Jeong. The study has been published in Nature.
Previous studies have shown that Cu oxidation occurs due to microscopic ‘multi-steps’ on the surface of copper. These steps provide a source of Cu adatoms (adsorbed atoms), which interact with oxygen and provide a place for oxides to grow. This is why single-crystalline Cu is resistant to oxidation. “We used a method called atomic sputtering epitaxy to grow tightly coordinated flat single-crystal copper films. By using noise reduction systems to reduce electrical and mechanical noises, we were able to keep the Cu surfaces nearly defect-free and fabricate atomically flat films,” explains Prof. Jeong.
The research team then used high-resolution transmission electron microscopy (HR-TEM) to study the Cu films. They found that the film grew in the  direction and had an almost flat surface with occasional mono-atomic steps. They then compared the single-crystal Cu (111) films (SCCFs) with other Cu films which had higher surface roughness and found that unlike with the other films, the SCCFs were oxidation-resistant, i.e., it is very difficult for oxygen to penetrate the mono-atomic step edge.
The researchers then used a microscopic model of Cu oxidation based on ‘density functional theory’ to investigate how the SCCF interacts with oxygen. They found that the surface of the SCCF was protected by oxygen itself, once 50% of its surface was covered with oxygen atoms. Additional absorption of oxygen atoms on the SCCF was suppressed by the high energy barrier they, themselves, created.
“The novelty of our research lies in the realization of atomically flat surfaces, i.e., surfaces that are flat on the atomic level, as well as an elucidation of the oxidation-resistance mechanism of ultraflat metals,” concludes Prof. Jeong.
The findings of this study make major contributions not only to the electronics and semiconductor industry, but also go a long way towards helping protect priceless bronze sculptures from damage.
Original Article: Pusan National University researchers develop “corrosion-free” copper thin films
More from: Pusan National University
The Latest on: Oxidation-resistant Cu
- Sludgebusters: WWTP operators, local governments access best way to process biosolidson March 27, 2023 at 9:47 am
Thermal oxidation is being pushed as a way forward.” Despite his research and firm convictions Warren’s WWT operator finds himself stuck in a sludgy quagmire — while local governments, ...
- Graphene And Copper Nanowire Thermal Interface With Low Thermal Resistanceon March 15, 2023 at 5:00 pm
they suffer from the complications of having to build up these copper pillars in place, and subsequent oxidation reducing the effectiveness. While graphene and similar materials have shown ...
- The best resistance bands for workouts 2023on March 3, 2023 at 7:42 am
The best resistance bands offer strength and recovery training for exercisers who pack light when they travel or need an alternative to weights. If you're working through injury rehabilitation or ...
- Nano Copper Oxide Market Size, Trends, Growth Status, Share, Research, and Forecast 2031on March 1, 2023 at 8:25 pm
The modern-day document posted via Report Ocean, titled " Nano Copper Oxide Market: Global Industry Trends, Share, Size, Growth, Opportunity and Forecast 2023 to 2031 ," affords a complete evaluation ...
- What Is the Resistance Level of a Stock? Definition, Example & Explanationon March 2, 2022 at 2:39 pm
Resistance —the opposite of support—is the price above which a security doesn't tend to rise over a particular period of time. A resistance level—often referred to simply as “resistance ...
- Reversible Oxidation of Copper(I) Iodide in the Presence of Imidazoleon October 15, 2018 at 5:43 am
THE importance of copper ions in natural redox systems is well known. For example, the oxidation of diphenols by molecular oxygen occurs by way of a Cu(I) to Cu(II) oxidation in the diphenol oxidase.
- Foil Tapes Informationon February 12, 2018 at 6:33 am
A brass carrier adds additional corrosion resistance. Copper w/ tin plating - An additional tin plating to copper carriers facilitates soldering, and also resists oxidation and corrosion. Steel - ...
- Electrodes and Electrode Materials Informationon February 12, 2018 at 5:50 am
Copper is second only to silver in terms of bulk electrical conductivity. Copper has better strength than silver, but offers inferior oxidation resistance. Copper is a common base metal for electrical ...
- Top Copper Stocks for March 2023on November 9, 2016 at 6:39 am
Top copper stocks include Ero Copper Corp., Southern Copper Corp., and Taseko Mines Ltd., which have outperformed their peers over the past 12 months. Copper stocks as a group, represented by the ...
- Oxidation reactions in foodon October 14, 2014 at 5:54 pm
Foods which contain edible oils will spoil once exposed to oxygen from the air due to oxidation reactions. This chemical change results in a bad flavour and smell from the food. If left exposed to ...
via Bing News
The Latest on: Oxidation-resistant Cu
[google_news title=”” keyword=”oxidation-resistant Cu” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News