- Chemistry - Oct 20 Turning biofuel waste into wealth in a single step
- Chemistry - Oct 19 £1.83m grant for greener, cheaper fuels and chemicals
- Chemistry - Oct 19 Blood molecule key to more efficient batteries
- Chemistry - Oct 19 Making new functional polymers for 3D printers
- Chemistry - Oct 18 ’Bolt of lightning’ captures development of block copolymer
- Chemistry - Oct 17 Grant to help dairy farms avoid setbacks from extreme weather
- Physics - Oct 17 Nanowires as Sensors in New Type of Atomic Force Microscope
- Life Sciences - Oct 14 With designer lignin, biofuels researchers reproduced evolutionary path
- Medicine - Oct 14 Major advance in designer drug development
- Life Sciences - Oct 13 In creation of cellular protein factories, less is sometimes more
- Physics - Oct 12 New ERC Grant at TU Wien
- Physics - Oct 12 Atomic- scale MRI holds promise for new drug discovery
- Medicine - Oct 11 ’Smart drug’ clears fat from liver and blood
- Physics - Oct 11 Simulations show how to turn graphene’s defects into assets
- Physics - Oct 11 Nanoscale engineering transforms particles into LEGO- like? building blocks
- Life Sciences - Oct 10 Bigger than ever, Cornell corpse flower poised to bloom
Team develops highly efficient method for creating flexible, transparent electrodes
As the market for liquid crystal displays and other electronics continues to drive up the price of indium — the material used to make the indium tin oxide (ITO) transparent electrodes in these devices — scientists have been searching for a less costly and more dynamic alternative, particularly for use in future flexible electronics.
Besides its high price, ITO has several drawbacks. It’s brittle, making it impractical for use in flexible displays and solar cells, and there is a lack of availability of indium, which is found primarily in Asia. Further, the production of ITO films is relatively inefficient.
Now, researchers at UCLA report in the journal ACS Nano that they have developed a unique method for producing transparent electrodes that uses silver nanowires in combination with other nanomaterials. The new electrodes are flexible and highly conductive and overcome the limitations associated with ITO.
For some time, silver nanowire (AgNW) networks have been seen as promising candidates to replace ITO because they are flexible and each wire is highly conductive. But complicated treatments have often been required to fuse crossed AgNWs to achieve low resistance and good substrate adhesion. To address this, the UCLA researchers demonstrated that by fusing AgNWs with metal-oxide nanoparticles and organic polymers, they could efficiently produce highly transparent conductors.
The team of researchers represents a collaboration between the department of materials science and engineering at the UCLA Henry Samueli School of Engineering and Applied Science; the department of chemistry and biochemistry in the UCLA College of Letters and Science; and the California NanoSystems Institute (CNSI) at UCLA.
The team was led by Yang Yang , a professor of materials science and engineering, and Paul Weiss , director of the CNSI and a professor of materials science and engineering and of chemistry and biochemistry.
"In this work, we demonstrate a simple and effective solution method to achieve highly conductive AgNW composite films with excellent optical transparency and mechanical properties," said Yang who also directs the Nano Renewable Energy Center at the CNSI. "This is by far the best solution: a processed, transparent electrode that is compatible with a wide variety of substrate choices."
Scientists can easily spray a surface with the nanowires to make a transparent mat, but the challenge is to make the silver nanowires adhere to the surface more securely without the use of extreme temperatures (200° C) or high pressures, steps that make the nanomaterials less compatible with the sensitive organic materials typically used to make flexible electronics.
To meet this challenge, Rui Zhu, the paper’s first author, developed a low-temperature method to make high-performance transparent electrodes from silver nanowires using spray coating of a unique combination of nanomaterials.
First, researchers sprayed a solution of commercially available silver nanowires onto a surface. They then treated the nanowires with a solution of titanium dioxide nanoparticles to create a hybrid film. As the film dries, capillary forces pull the nanowires together, improving the film’s conductivity. The scientists then coated the film with a layer of conductive polymer to increase the wires’ adhesion to the surface.
The AgNW composite meshes are highly conductive, with excellent optical transparency and mechanical properties. The research team also built solar cells using the new electrodes and found that their performance was comparable to that of solar cells made with indium tin oxide.
The California NanoSystems Institute is an integrated research facility located at UCLA and UC Santa Barbara. Its mission is to foster interdisciplinary collaborations in nanoscience and nanotechnology; to train a new generation of scientists, educators and technology leaders; to generate partnerships with industry; and to contribute to the economic development and the social well-being of California, the United States and the world. The CNSI was established in 2000 with $100 million from the state of California. The total amount of research funding in nanoscience and nanotechnology awarded to CNSI members has risen to over $900 million. UCLA CNSI members are drawn from UCLA’s College of Letters and Science, the David Geffen School of Medicine, the School of Dentistry, the School of Public Health and the Henry Samueli School of Engineering and Applied Science. They are engaged in measuring, modifying and manipulating atoms and molecules — the building blocks of our world. Their work is carried out in an integrated laboratory environment. This dynamic research setting has enhanced understanding of phenomena at the nanoscale and promises to produce important discoveries in health, energy, the environment and information technology.
Last job offers
- Life Sciences - 18.10
PhD position in design and formulation of nanoconstructs
- Physics/Materials Science - 6.10
Physiker / Mathematiker / Informatiker (m/w) Metrologie: Sensorik von Hochpräzisionsmaschinen
- Physics/Materials Science - 29.9
PSI-FELLOW-II-3i / Postdoctoral Fellows
- Physics/Materials Science - 21.10
Assistant Professor in quantum optical biomagnetometry
- Life Sciences - 20.10
Postdoctoral Researcher in developmental neurobiology: genetic control of neuronal specification in the...
- Life Sciences - 20.10
UniversitätsassistentIn - Postdoc
- Chemistry - 4.10
UniversitätsassistentIn - Postdoc
- Life Sciences - 21.10
Professorship for Zoology with a focus on Molecular Developmental Biology of Animals