Scientists at the University of Massachusetts Amherst report in the current issue of Small that they have genetically designed a new strain of bacteria that spins out extremely thin and highly conductive wires made up solely of non-toxic, natural amino acids.
Researchers led by microbiologist Derek Lovley say the wires, which rival the thinnest wires known to man, are produced from renewable, inexpensive feedstocks and avoid the harsh chemical processes typically used to produce nanoelectronic materials.
Lovley says, “New sources of electronic materials are needed to meet the increasing demand for making smaller, more powerful electronic devices in a sustainable way.” The ability to mass-produce such thin conductive wires with this sustainable technology has many potential applications in electronic devices, functioning not only as wires, but also transistors and capacitors. Proposed applications include biocompatible sensors, computing devices, and as components of solar panels.
This advance began a decade ago, when Lovley and colleagues discovered that Geobacter, a common soil microorganism, could produce “microbial nanowires,” electrically conductive protein filaments that help the microbe grow on the iron minerals abundant in soil. These microbial nanowires were conductive enough to meet the bacterium’s needs, but their conductivity was well below the conductivities of organic wires that chemists could synthesize.
“As we learned more about how the microbial nanowires worked we realized that it might be possible to improve on Nature’s design,” says Lovley. “We knew that one class of amino acids was important for the conductivity, so we rearranged these amino acids to produce a synthetic nanowire that we thought might be more conductive.”
The trick they discovered to accomplish this was to introduce tryptophan, an amino acid not present in the natural nanowires. Tryptophan is a common aromatic amino acid notorious for causing drowsiness after eating Thanksgiving turkey. However, it is also highly effective at the nanoscale in transporting electrons.
“We designed a synthetic nanowire in which a tryptophan was inserted where nature had used a phenylalanine and put in another tryptophan for one of the tyrosines. We hoped to get lucky and that Geobacter might still form nanowires from this synthetic peptide and maybe double the nanowire conductivity,” says Lovley.
The results greatly exceeded the scientists’ expectations. They genetically engineered a strain of Geobacter and manufactured large quantities of the synthetic nanowires 2000 times more conductive than the natural biological product. An added bonus is that the synthetic nanowires, which Lovley refers to as “biowire,” had a diameter only half that of the natural product.
“We were blown away by this result,” says Lovley. The conductivity of biowire exceeds that of many types of chemically-produced organic nanowires with similar diameters. The extremely thin diameter of 1.5 nanometers (over 60,000 times thinner than a human hair) means that thousands of the wires can easily be packed into a very small space.
The added benefit is that making biowire does not require any of the dangerous chemicals that are needed for synthesis of other nanowires. Also, biowire contains no toxic components. “Geobacter can be grown on cheap renewable organic feedstocks so it is a very ‘green’ process,” he notes. And, although the biowire is made out of protein, it is extremely durable. In fact, Lovley’s lab had to work for months to establish a method to break it down.
“It’s quite an unusual protein,” Lovley says. “This may be just the beginning” he adds. Researchers in his lab recently produced more than 20 other Geobacter strains, each producing a distinct biowire variant with new amino acid combinations. He notes, “I am hoping that our initial success will attract more funding to accelerate the discovery process. We are hoping that we can modify biowire in other ways to expand its potential applications.”
The Latest on: Nanoelectronic materials
[google_news title=”” keyword=”Nanoelectronic materials” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Nanoelectronic materials
- Manufacturing Materialson February 22, 2024 at 11:08 am
Selecting the most suitable material for your project is very important. Carefully consider the physical properties, working properties, cost and sustainability of each material. JOE Hello and ...
- Advanced materialson February 20, 2024 at 4:00 pm
Research and innovation in advanced materials at The University of Manchester focuses on solving some of the world’s most critical problems. We need metals that can survive in the harshest conditions, ...
- Seeing Through Layers: Translucent Materials in Architectureon February 19, 2024 at 4:00 pm
CO2 Pavilion Beijing / Superimpose Architecture. Image © Beijing Shardisland Technology Co., Ltd. Translucency, at its essence, is an optical property that enables ...
- Nanoelectronics from the bottom upon February 19, 2024 at 9:52 am
Such areas include the development of 3D multifunctional nanoelectronic and hybrid nanoelectronic ... independent of material or substrate, provides a new way to consider building the future.
- Basic Materials Roundup: Market Talkon February 16, 2024 at 2:01 pm
The latest Market Talks covering Basic Materials. Published exclusively on Dow Jones Newswires at 4:20 ET, 12:20 ET and 16:50 ET. 0740 ET – Agnico Eagle Mines logged a 4Q earnings beat and ...
- Materials Science Newson February 13, 2024 at 4:00 pm
Feb. 15, 2024 — Ferromagnetism and antiferromagnetism have long been known to scientists as two classes of magnetic order of materials. Back in 2019, researchers postulated a third class of ...
- Lesson 1.2 - Testing Materials to Learn About Their Propertieson February 8, 2024 at 3:15 pm
Students will develop an understanding that objects and materials can be tested to learn about their properties. Students will help plan and conduct different tests on the materials. Students will be ...
- Materials Researchon February 7, 2024 at 6:56 am
UDRI conducts comprehensive research and development in the full spectrum of materials. Since 1957, our work in material types, materials characterization, materials phenomena, and materials ...
- 10 Top Materials Stocks Of February 2024on February 5, 2024 at 4:01 pm
Commissions do not affect our editors' opinions or evaluations. Materials like metal, concrete and chemicals are the foundation of the global economy—every sector requires basic materials ...
- Mark Hersam Elected to National Academy of Engineeringon February 5, 2024 at 4:01 pm
Hersam was cited for “the synthesis, purification, functionalization, and application of low-dimensional nanoelectronic materials.” As director of the Northwestern University Materials Research ...
via Bing News