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Category Archives: Nanotechnology
Researchers Develop Goldene A New Form of Ultra-Thin Gold With Semiconductor Properties – SciTechDaily
Researchers at Linkping University have successfully created single-atom-thick gold sheets, known as goldene, using a technique inspired by ancient Japanese smiths. Credit: SciTechDaily.com
For the first time, scientists have managed to create sheets of gold only a single atom layer thick. The material has been termed goldene. According to researchers from Linkping University, Sweden, this has given the gold new properties that can make it suitable for use in applications such as carbon dioxide conversion, hydrogen production, and production of value-added chemicals. Their findings are published in the journal Nature Synthesis.
Scientists have long tried to make single-atom-thick sheets of gold but failed because the metals tendency to lump together. But researchers from Linkping University have now succeeded thanks to a hundred-year-old method used by Japanese smiths.
If you make a material extremely thin, something extraordinary happens as with graphene. The same thing happens with gold. As you know, gold is usually a metal, but if single-atom-layer thick, the gold can become a semiconductor instead, says Shun Kashiwaya, researcher at the Materials Design Division at Linkping University.
Lars Hultman, professor of thin film physics and Shun Kashiwaya, researcher at the Materials Design Division at Linkping University. Credit: Olov Planthaber
To create goldene, the researchers used a three-dimensional base material where gold is embedded between layers of titanium and carbon. But coming up with goldene proved to be a challenge. According to Lars Hultman, professor of thin film physics at Linkping University, part of the progress is due to serendipidy.
We had created the base material with completely different applications in mind. We started with an electrically conductive ceramics called titanium silicon carbide, where silicon is in thin layers. Then the idea was to coat the material with gold to make a contact. But when we exposed the component to high temperature, the silicon layer was replaced by gold inside the base material, says Lars Hultman.
For the first time, scientists have managed to create sheets of gold only a single atom layer thick. Credit: Olov Planthaber
This phenomenon is called intercalation and what the researchers had discovered was titanium gold carbide. For several years, the researchers have had titanium gold carbide without knowing how the gold can be exfoliated or panned out, so to speak.
By chance, Lars Hultman found a method that has been used in Japanese forging art for over a hundred years. It is called Murakamis reagent, which etches away carbon residue and changes the color of steel in knife making, for example. But it was not possible to use the exact same recipe as the smiths did. Shun Kashiwaya had to look at modifications:
I tried different concentrations of Murakamis reagent and different time spans for etching. One day, one week, one month, several months. What we noticed was that the lower the concentration and the longer the etching process, the better. But it still wasnt enough, he says.
Shun Kashiwaya, researcher at the Materials Design Division at Linkping University. Credit: Olov Planthaber
The etching must also be carried out in the dark as cyanide develops in the reaction when it is struck by light, and it dissolves gold. The last step was to get the gold sheets stable. To prevent the exposed two-dimensional sheets from curling up, a surfactant was added. In this case, a long molecule that separates and stabilises the sheets, i.e. a tenside.
The goldene sheets are in a solution, a bit like cornflakes in milk. Using a type of sieve, we can collect the gold and examine it using an electron microscope to confirm that we have succeeded. Which we have, says Shun Kashiwaya.
Lars Hultman, professor of thin film physics at Linkping University. Credit: Olov Planthaber
The new properties of goldene are due to the fact that the gold has two free bonds when two-dimensional. Thanks to this, future applications could include carbon dioxide conversion, hydrogen-generating catalysis, selective production of value-added chemicals, hydrogen production, water purification, communication, and much more. Moreover, the amount of gold used in applications today can be much reduced.
The next step for the LiU researchers is to investigate whether it is possible to do the same with other noble metals and identify additional future applications.
Reference: Synthesis of goldene comprising single-atom layer gold by Shun Kashiwaya, Yuchen Shi, Jun Lu, Davide G. Sangiovanni, Grzegorz Greczynski, Martin Magnuson, Mike Andersson, Johanna Rosen and Lars Hultman, 16 April 2024, Nature Synthesis. DOI: 10.1038/s44160-024-00518-4
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Researchers Develop Goldene A New Form of Ultra-Thin Gold With Semiconductor Properties - SciTechDaily
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2024 WIN Summer School on Sustainable Nanotechnology | Waterloo Institute for Nanotechnology – University of Waterloo
*subject to change Day 1 Next Generation Energy Systems
Wednesday, June 19, 2024
Asif Abdullah Khan (PDF)
Powering the Future: Exploring the World of Flexible Piezoelectric Composites for IoT Solutions
Xin Zeng (PDF)
Advanced Green Energy Technologies for Sustainable Development
Saeed Hadad (PhD)
Leveraging Innovations: Advances in All-Solid-State Batteries for Sustainable Energy Storage Systems
Lunch
Thursday, June 20, 2024
Elaine Lengowski (Visiting Scholar)
Manufacturing Nanocellulose
Farman Ullah (Research Associate)
Introduction to Thin Film Deposition Systems and Spatial Atomic Layer Deposition and Their Application
Ashna Rajeev (PDF)
Intersection of nanotechnology and polymer engineering for smart and functional materials
Ghulam Ab (PDF)
In-situ Raman Spectroelectrochemistry of graphene and related 2D materials: Understanding the localized charge transfer process and (de)intercalation charge storage process for rechargeable batteries
Una Hogan (PhD Student)
Machine Learning as a tool in Micro and Nanoplastics Identification using Raman Spectroscopy
Friday June 21, 2024
9:00 10:00 am
James Cheon/ Micheal Tam
QNC 3402
Micheal Tam
10:00am 10:30 am
Tyler Lott (PhD)
High-resolution bio-imaging via liquid-phase electron microscopy
QNC 3402
German Sciaini
10:30 11:00 am
Break
11:00 11:30 am
Peyman GhavamiNejad (PhD)
Minimally- and non-invasive biomedical devices for point of care diagnosis
QNC 3402
Mahla Poudineh
11:30 am 12:00 pm
Fatemah Keyvani (PhD) Mahla Poudineh
Wearable Biosensor for Health Monitoring
QNC 3402
Mahla Poudineh
12:00 1:00 pm
Lunch
1:00 2:00 pm
Lab Tour: Saeed Hadad/Micheal Tam
QNC 5512
Micheal Tam
2:00 2:30 pm
Hackathon time
QNC 3402
2:30 4:00 pm
Closing Reception with Hackathon Presentations
QNC 3402
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Five Companies Leading the Development of Nanotechnology – Securities.io
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Five Companies Leading the Development of Nanotechnology - Securities.io
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Light manipulation with sub-pixel wavefront control using gap phases – Nature.com
Publishers note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
This is a summary of: Chen, Q. et al. Highly efficient vortex generation at the nanoscale. Nat. Nanotechnol. https://doi.org/10.1038/s41565-024-01636-y (2024).
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Light manipulation with sub-pixel wavefront control using gap phases - Nature.com
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UAH researcher wins $588K NSF CAREER Award to study magnetic nanoparticles to benefit health, industry – Newswise
BYLINE: Russ Nelson
Newswise Dr. Isaac Torres-Daz, a researcher at The University of Alabama in Huntsville (UAH), has won a $588,000 National Science Foundation (NSF) CAREER Award to support research into magnetic nanoparticles, which can be manipulated using magnetic fields. These particles consist of a magnetic material, often iron, nickel and cobalt, combined with a chemical component, for a wide range of applications, such as sensors and nanobots that can be inserted into the blood to execute non-invasive treatments at cellular scales or support hyperthermia therapy in the treatment of cancer.
With magnetic hyperthermia for medical treatments, the potential enhanced heating effect is caused by the orientation of magnetic particles and their interactions. Overall, the award can advance the fundamental understanding of hydrodynamics and nanotechnology.
Torres-Dazs work also benefits magneto-rheology the branch of physics dealing with the deformation and flow of matter due to the variable polarization response based on the size and shape of the magnetic particles. These advances could lead to smart fluids that change viscosity in the presence of a magnetic field, of significant commercial interest for engineering applications such as car shock absorbers and aerospace hydraulic dampers that convert the kinetic energy of moving parts into thermal energy. The innovations offer potential boons for drug delivery advancements as well for transporting pharmaceutical compounds to a target site to achieve a desired therapeutic effect.
The Faculty Early Career Development CAREER Program offers the NSF's most prestigious awards in support of early-career faculty. The five-year grant will address one of the main challenges in colloid science, which is to establish the connections between interacting particles with different shapes and their arrangement under the influence of a magnetic field. Colloid science is an interdisciplinary blend of chemistry, physics, nanoscience and other fields that deals with colloids, which are homogeneous substances consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance.
A part of a researcher's activities is to find and define problems relevant to society, says Torres-Daz, an assistant professor of Chemical and Materials Engineering at UAH, a part of The University of Alabama System. My passion for magnetic nanoparticles and my long experience studying them from theoretical and experimental perspectives have driven me to define this as a research topic. One of the main challenges is to quantify their interactions as a function of position and orientation.
The main goal is to gain insights that help realize the potential of anisotropic colloids. Unlike isotropic colloids, such as uniform spheres which show the same properties in all directions, anisotropic particles, shapes such as rods, ellipsoids and cubes, are non-uniform in their shape and show different properties in different directions.
I combined my mechanical and chemical engineering background to tackle a fundamental problem of interacting anisotropic particles that can potentially impact different applications, Torres-Daz says.
The research is especially important to the development of tunable materials, where certain materials have a polarization that can be reversed by the application of an external magnetic field. The work impacts polarized surfaces, such as when a chemical film is applied to a transparent plastic or glass surface to filter the light that is allowed to pass through.
Kristina Hendrix 256-824-6341 [emailprotected]
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UAH researcher wins $588K NSF CAREER Award to study magnetic nanoparticles to benefit health, industry - Newswise
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Chiral powers next-generation electronics with nanomaterials as it raises $3.8m – Installation – Installation and AV Technology Europe
Nanotechnology companyChiral has announced a $3.8m funding round to address the challenge of silicon-based chip shortages, innovating the way nanomaterials are integrated into devices. Its expertise in nanotechnology, automation, and high-precision robotics is said to be pivotal in the industrys move beyond silicon to the next generation of electronics. The pre-seed funding round was co-led by Founderful (formerly Wingman Ventures) and HCVC and includes grants from ETH Zurich and Venture Kick.
Chipmaking has become one of the worlds most critical technologies in the last two decades. The main driver of this explosive growth has been the continuous scaling of silicon technology (widely known as Moores Law). But these advances in silicon technology are slowing down, as we reach the physical limits of silicon. For this reason, the industry has been investing heavily in nanomaterials like carbon nanotube, graphene and TMDs, which are expected to enable chips with unprecedented functionality. However, making electronic devices with these extremely small materials at speed, with precision, and without compromising on quality has been a long-standing obstacle.
Research has evidenced the use case and impact of nanomaterials across a range of electronics including high-performance transistors, low-power sensors, quantum devices, and many more. However, existing production methods, mostly based on chemistry, are not controllable, which has thus far prevented commercialisation of these devices.
Chiral has built high-speed, automated, robotic machines that integrate nanomaterials into devices. These machines can robotically place micrometer-sized (or even nanometer-sized) materials on small chips. Repeating these motions in a fast and automated manner requires a very high level of engineering, which, when done right, ensures the precision and control that conventional chemistry-based methods lack.
The development of Chirals technology started as a national research project conducted at the Swiss Federal Institutes of Technology (ETH Zurich, EPFL, and Empa), in which the companys co-founders, Seoho Jung, Natanael Lanz, and Andre Butzerin participated as PhD students. After 4 years of R&D, the research team finished its first prototype machine, which was 100 times faster than the other systems available at the time. The immediate reaction of the market to the prototype, which quickly led to the companys first batch of pilot customers, convinced the co-founders that they should continue their activity as a company. They incorporated Chiral in June 2023 as a result.
At Chiral, we are pioneering the next generation of electronic devices across industry, explained Seoho Jung, co-founder and CEO at Chiral. Chipmakers are aware of the potential of nanomaterials and were bringing that potential to life. This funding will accelerate the development of our next machine, which will unlock new market opportunities with its versatility and performance. We are also excited to scale our team to keep up with the growing demand and customer base.
The global nanotechnology market size is projected to grow from $79.14 billion in 2023 to $248.56 billion by 2030, at a CAGR of 17.8% (Fortune business insights research). One of the largest chipmakers in the world, Taiwan Semiconductor Manufacturing Company (TSMC)presented its development roadmapshowing nanomaterial-based transistors as its future architecture.
Were thrilled to join forces with Chiral alongside HCVC, said Pascal Mathis, founding partner at Founderful. Chirals AI- and robotics-based technology lets us envision a future where nanomaterial-based chips are being produced at the scale needed for commercialisation a major bottleneck up until now. We look forward to supporting Seoho, Natanael and Andr in their journey to introduce a new paradigm of chips beyond silicon.
Alexis Houssou, founding partner at HCVC, added:With the current boom in AI applications, we stand at a pivotal moment where the slowdown of Moores law threatens to decelerate the pace of technological progress significantly. The team at Chiral has embarked on a critical mission to pave the way toward a groundbreaking post-silicon era, promising to transcend current limitations and unlock new possibilities for advancement. We couldnt be more excited to support their mission, in collaboration with Founderful, as they build the future of computing infrastructure.
Jung concluded:In the future, it will be normal for electronic devices or chips to contain nanomaterials. The development roadmaps of the worlds leading chipmakers like TSMC, Samsung, and Intel all share our vision. We are confident that Chiral technology will empower the industry to make this transition faster.
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Chiral powers next-generation electronics with nanomaterials as it raises $3.8m - Installation - Installation and AV Technology Europe
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