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Nanosys Gets 3M to Bring Its Quantum Dot Technology to LCDs


It appears that Nanosys Inc. has found a Liquid Crystal Display (LCD) manufacturer to bring its quantum dot material to market. Nanosys will be supplying its Quantum Dot Enhancement Film (QDEF) technology to the Optical Systems Division of 3M Company to produce an LCD capable of displaying 50 percent more color.

“We are working together to improve an area of display performance that has been largely neglected for the last decade,” said Jason Hartlove, President and CEO of Nanosys in a company press release announcing the agreement. “Improving color performance for LCDs with drop-in solutions will bring a stunning new visual experience to the consumer and a competitive advantage to the LCD manufacturer against new display technologies such as OLED.  Working together with 3M and utilizing their outstanding design and supply chain capabilities will allow our QDEF technology to be widely deployed across all product segments and will ensure availability to all customers.”

While Nanosys seems to have found an avenue for its technology in the LCD market, what became of its attempts to break into the Light Emitting Diode (LED) biz? Back in 2010 I covered the company's use of quantum dots for use in LEDs and was provided a primer on the technology from its Vice President of Worldwide Sales & Marketing at the time, Victor Hsia:

“Nanosys synthesizes quantum dot phosphor material which is subsequently packaged in a form called a Quantum Rail. For LED backlit displays, our Quantum Rail is inserted between an illuminating strip of blue LEDs and the input edge of the display's lightguide panel. Current LED backlights use conventional white LEDs (which are BLUE LEDs with YAG phosphor) that cannot produce saturated GREEN or RED colors. In contrast Nanosys' Quantum Rail produces a pure white light by using a BLUE LED with Green and Red Quantum Dot phosphors, which results in a tuned white light source that enables over 100 percent NTSC color gamut using the same high volume LCD display manufacturing flow that exists today.”

So, what happened? I have looked for some more information on how the Nanosys technology is being used in LEDs but haven’t turned up much.

Getting back to this recent announcement, it’s an interesting approach that both 3M and Nanosys are taking. They spruce up good old LCD technology so that it can better compete with Organic Light Emitting Diodes (OLED) technology performance. The big question will be whether it can actually deliver on that promise of equal performance at a fraction of the cost and better energy efficiency. We’ll see when a product comes to market.

Konarka Goes Belly-Up, But Irrational Exuberance is Alive and Well


Oddly it seems that you can’t convince people of the rule that technology-push is never as promising as market-pull. We have to add another example to the long litany of companies that have crashed against the rocks of this simple rule: Konarka—a developer of thin-film solar panels—filed bankruptcy last week under chapter 7 of the Federal bankruptcy laws.

Konarka was launched with great fanfare back in 2001 with Nobel Prize winner Dr. Alan Heeger as one of its founders and despite never quite getting a product to market by 2007 had managed to raise over US $100 million.

It appears that the political press is already making hay with this announcement dubbing the Massachusetts-based Konarka “Romney’s Solyndra” based on the fact that when Mitt Romney was governor, Massachusetts lent $1.5 million to Konarka.

Beyond the issue of political gamesmanship, the area of nanotech in alternative energy solutions remains fertile soil for attracting investors and delivering little in terms of returns

When you have Nobel Laureates in economics saying that the reason solar power is not our main energy source is because of some conspiracy among oil producers, there are plenty of excuses for pursuing technologies that at present just don’t measure up to the fossil fuel variety. 

The lesson to be learned from the cautionary tale of Konarka should not be that investments in new energy sources should be avoided, but instead that we may need an entirely new apparatus for developing emerging technologies. Unfortunately before such a new method is adopted, it seems that other companies will likely follow Konarka into bankruptcy while they beguile investors with stories of their remarkable technologies—which nobody seems to want to buy

Rational Design of Nanomaterials Takes a Step Forward

Measuring, characterizing, and manipulating at the nanoscale are foundational elements of nanotechnology. And this week we’ve seen in news from IBM just how important improving microscopy is to all that.

Now researchers at the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have used transmission electron microscopy and advanced liquid cell handling to see if they could gather evidence to support the controversial theory that nanoparticles act as artificial atoms during the growth of crystals.

“We observed that as nanoparticles become attached they initially form winding polycrystalline chains,” says Haimei Zheng, a staff scientist in Berkeley Lab’s Materials Sciences Division in a press release. “These chains eventually align and attach end-to-end to form nanowires that straighten and stretch into single crystal nanorods with length-to-thickness ratios up to 40:1. This nanocrystal growth process, whereby nanoparticle chains as well as nanoparticles serve as the fundamental building blocks for nanorods, is both smart and efficient.”

You can see this process quite clearly in the video:

The research, which was published last week in the journal Science, observed the nanoparticles “undergo continuous rotation and interaction until they find a perfect lattice match. A sudden jump to contact then occurs over less than 1 nanometer, followed by lateral atom-by-atom addition initiated at the contact point.”

This observation and understanding of how nanoparticles make up crystal growth will likely provide important insight into the design of nanomaterials.

“From what we observed only single nanoparticles exist at the beginning of crystal growth, but, as growth proceeds, small chains of nanoparticles become dominant until, ultimately, only long chains of nanoparticles can be seen,” Zheng says. “Our observations provide a link between the world of single molecules and hierarchical nanostructures, paving the way for the rational design of nanomaterials with controlled properties.”

Carbon Nanotubes Go Back Inside Fuel Cells

Researchers have tried to apply carbon nanotubes to fuel cells for some time now. At first there was hope that carbon nanotubes would help fuel cells better store hydrogen. That dream was dashed and then later resurrected. There has also been the idea that carbon nanotubes could be used as a cheaper alternative to expensive catalysts within fuel cells

I suppose those are worthy areas of pursuit, but the two main issues that have prevented fuel cells from gaining wider adoption—at least in the area of powering automobiles—are the costs of isolating hydrogen and building an infrastructure that would deliver that hydrogen to the automobiles. The issue of isolating hydrogen has taken precedence of late in nanotech/fuel cell research both at the commercial level and at research labs

But now researchers from Stanford University are again looking at how carbon nanotubes could replace more expensive catalysts used in oxidizing the hydrogen at the anode within the fuel cell.

Hongjie Dai, a professor of chemistry at Stanford and co-author of the study, believes that a cheaper oxidizing catalyst will facilitate wider adoption of fuel cells.

"Platinum is very expensive and thus impractical for large-scale commercialization," says Dai in the Stanford press release covering the research. "Developing a low-cost alternative has been a major research goal for several decades."

Well, if you could develop a catalyst for this purpose that was essentially free, it still wouldn’t usher in a hydrogen economy any time soon. But I suppose it couldn’t hurt.

The research, which was published in the May 27th online edition of the journal Nature Nanotechnology, showed that when the outer walls of a multi-walled carbon nanotube (MWNT) were shredded—and the inner walls left intact—the catalytic ability of the MWNTs were enhanced while maintaining good electrical conductivity.

What I find most intriguing about the research is the potential to use these imperfect MWNTs for metal-air batteries. The researchers hint at this, though they have yet to fully explore the possibilities.

"Lithium-air batteries are exciting because of their ultra-high theoretical energy density, which is more than 10 times higher than today's best lithium ion technology," Dai says in the Stanford press release. "But one of the stumbling blocks to development has been the lack of a high-performance, low-cost catalyst. Carbon nanotubes could be an excellent alternative to the platinum, palladium and other precious-metal catalysts now in use."

I think it's all together possible that researchers at IBM and the US national labs who have been working on metal-air batteries for years now might be somewhat more interested in this line of research than fuel-cell manufacturers.

IBM Pushes Atomic Force Microscopy to Its Limits

Back in 2009 IBM pushed the boundaries of surface microscopy when they developed a technique for noncontact atomic force microscopy (AFM) that enabled the resolving of single atoms in molecules.  Since then IBM has been working on this foundational work to develop a Kelvin probe force microscopy (KPFM) technique that enabled the first imaging of the charge distribution within a molecule

Now the team, based in Zurich, that have been at the forefront of this research have just completed some collaborative research with the Royal Society of Chemistry (RSC) and the University of Warwick in which they have imaged the synthetic molecule Olympicene (named after its resemblance to the five-ring design of the Olympic symbol) to the point where they could not only image individual hydrogen atoms but also manipulate them. Here's a video describing the research:

While IBM’s noncontact AFM had shown the ability to image hydrogen atoms previously, this latest research made that capability more concrete, according to Leo Gross, Scientist, at IBM Research Zurich.

A unique feature of the IBM-developed AFM technique is that it can image individual molecules whereas other techniques require that the molecules be collected into an aggregate crystal form. But perhaps even more importantly, what this line of research has demonstrated rather clearly is that they can use the tip of the AFM to induce reactions, such as forming a bond or extracting an atom.

This can be seen most clearly in the images the researchers created of the Olympicene molecule. In one you can see the bonds between the links of the molecule is much brighter. This is where there are two hydrogen atoms attach to the olympicene molecule.  In another image you can see that same site is no longer as bright because they have removed one of the hydrogen atoms, creating what they dubbed the Olympicene radical.

While Gross believes that the imaging and manipulation of hydrogen atoms marks the limits in scale for this technique, there are still things at this size they would like to investigate.  “We would like to look at things such as the adsorption, bonding and bonding angles, position, distances,” says Gross.

In addition to this line of research, Gross sees a great deal of potential is the KPFM technique. “We want to use this ability to image charge distribution and charge separation to study molecules for organic solar cells where charge separation is very important, and also for molecular electronics, such as single-molecule devices, which have a functionality depending on single electrons. The combined techniques of AFM and KPFM give us a very good tool to study these single-electron devices.”

Solid-State Dye-Sensitized Solar Cell Matches Performance of Grätzel Cell

In the past, I have tried to dispel the myth that nanotechnology could be waved over alternative energy applications to make them suddenly much more economically viable than they have been. In these efforts, I have even gone so far as to question the reasoning of Nobel Laureates in Economics on why we are not further along in the development of photovoltaics. 

This is not to say that nanotechnology is not improving various alternative energy solutions, in particular photovoltaics. But the process of bringing these technologies to market is much slower than many people seem willing to tolerate and their announcements should be taken with a grain of salt...and patience.

So, it is with some cautious optimism I alert you to research coming out of Northwestern University in which the researchers claim to have developed a new type of solar cell that has all the benefits of the Grätzel cell (or dye-sensitized solar cell (DSSC)) without the short life expectancy.

“The Grätzel cell is like having the concept for the light bulb but not having the tungsten wire or carbon material,” explains one of the researchers, Mercouri Kanatzidis, in the university’s press release covering the development. “We created a robust novel material that makes the Grätzel cell concept work better. Our material is solid, not liquid, so it should not leak or corrode.”

This is not the first time that researchers have attempted to find a replacement for the organic liquid that makes up the electrolyte in DSSCs. But previous attempts have resulted in solar cells with poor energy conversion efficiency. To overcome this Kanatzidis and his colleague Robert P.H. Chang used a thin-film compound made up of cesium, tin and iodine, which serves as a p-type direct bandgap semiconductor. Details of the new material can be found in their recently published article in Nature. The result is the Northwestern solar cell reached a conversion efficiency of 10.2 percent, in the neighborhood of the 11 to 12 percent reached by the best performing Grätzel cell.

“This is the first demonstration of an all solid-state dye-sensitized solar cell system that promises to exceed the performance of the Grätzel cell,” Chang is quoted as saying in the same university press release. “Our work opens up the possibility of these materials becoming state of the art with much higher efficiencies than we’ve seen so far.”

While the university press release quotes Chang as saying that their solar cell is “inexpensive,” there were no accompanying cost calculations to back up the claim. Last year, when I spoke to Michael Grätzel, the discoverer of the DSSC, we talked not of lifecycle costs, but about boosting the conversion efficiency of the DSSC. But perhaps more important than conversion efficiency, the key metric for Grätzel was the kWh price.

From my discussion with Grätzel in Budapest last May:

When it came to the question of conversion efficiency, Dr. Grätzel seemed resigned to the percentage game that seems to exist, but believed that kilowatt hour (kWh) to price was a more significant metric.

“We have to play the game. We have to go and have our efficiencies validated by an accredited PV calibration laboratory. We cannot create a different world where we just say we are the best,” he said. “We are living exactly with the standards that silicon has set in terms of efficiency and stability.

“But, on the other hand, it is true that when it comes to the advantages we should also play those up as well,” he said. He added that under certain outdoor exposures DSSC will already out perform silicon in the key metric of kWh price

“In the end, what we would really like to see is kWh price used as a metric in addition to peak watt price. The peak watt price is a good standard but when it comes to outdoor applications it often does not reflect reality such as the performance under cloudy conditions and the drop of conversion efficiency with temperature encountered by silicon solar cells,” he said.

It may be that the Northwestern researchers have developed a solar cell that when you calculate life cycle costs (presumably since they last longer they don't have to be replaced as often) has a better kWh cost than any other solar cells on the market, including the Grätzel cell. But I would like to see those calculations before I pronounce this as the replacement for any solar cell.

Graphene Adds Rustproofing Steel to Its List of Applications

While graphene continues its seemingly inexorable march towards electronics applications, I've also been chronicling some of the attempts to use graphene in applications outside of electronics

Along these lines, researchers at the University of Buffalo have now developed a use for graphene that rustproofs steel in a less toxic way than other methods. 

Sarbajit Banerjee, PhD, an assistant professor, and Robert Dennis, a PhD student, determined that graphene’s hydrophobic and conductive properties made it an ideal candidate for preventing corrosion. According to Banerjee in an article, graphene actually stunts electro-chemical reactions that transform iron into iron oxide, otherwise known as rust.

Graphene would replace the environmentally unfriendly hexavalent chromium in the rustproofing process of steel. This chemical has brought on a slew of environmental regulations that have taken their toll on the bottom line of some steel manufacturers.

In the video below, Robert Dennis explains a bit about the technology and also the inspiration to look at finding a more environmentally friendly approach to rustproofing steel.

“Our product can be made to work with the existing hardware of many factories that specialize in chrome electroplating, including job shops in Western New York that grew around Bethlehem Steel," explains Banerjee in the article. "This could give factories a chance to reinvent themselves in a healthy way in a regulatory environment that is growing increasingly harsh when it comes to chromium pollution."

To add a double irony to the story, the inspiration for this line of research came from the hope of help turning around the local steel business that's part of the broader Great Lakes industrial area known as the Rust Belt, and while the domestic industry is suffering largely due to outsourcing, the steel company that supported much of the research was India-based Tata Steel.

Nanoparticles and Sunshine Split Water Molecule for Hydrogen Gas

Just in case you believed that companies announce some nano-related research for a bit of buzz and then abandon the research, I am here to tell you that is not always the case. Back in March, I covered Santa Barbara, Calif.-based Hypersolar’s grand proposal for producing hydrogen gas in a zero-carbon process from wastewater.

To Hypersolar’s credit they have decided to chronicle their achievements (and perhaps failures) in a development process in which there are no guarantees of success. In the video below, Tim Young, CEO of HyperSolar, narrates a proof of concept prototype that demonstrates the effectiveness of the process. As Young explains, an inexpensive plastic baggy was filled with wastewater from a paper mill and on the bottom of the baggy is a small-scale solar device that is protected with Hypersolar’s polymer coating. Add sunlight, and hydrogen comes bubbling up.

“A big hurdle in using a solar to fuel conversion process is the stabilization of the semiconductor material against photocorrosion,” explains Young in a company press release announcing the development. “Our development of an efficient and low cost protective polymer coating that also allows good electrical conductivity is a significant achievement in our development of a cost effective means for using the power of the Sun to extract renewable hydrogen from water.”

Young suggests in the video that the small-scale solar device used in the prototype will be replaced with Hypersolar’s nanoparticles, which can be mass-produced and lead to large-scale production of hydrogen gas.

“The implications of our technology may be world changing,” claims Young in another company press release. “If we can successfully complete the development of a low cost, highly efficient solar powered water-splitting nanoparticle, we can use readily available seawater, runoff water, river water, or wastewater, to produce large quantities of hydrogen fuel to power the world. When the hydrogen fuel is used in fuel cells or combustion, clean water (pure H2O) returns back to the Earth. HyperSolar is making steady technical progress to enable this vision.”

It should be interesting to see whether this mimicking of photosynthesis will be able to compete with processes that simply replace platinum with a nanomaterial as a catalyst in the tried and tested electrocatalytic processes for producing hydrogen gas. 

Samsung Creates a Graphene Transistor with a Band Gap and Electron Mobility


Getting a graphene-based transistor to turn on and off has typically meant sacrificing its incredible electron mobility in the bargain. And the truth of it is that graphene's electron mobility—which is 200 times greater than that of silicon—is what has made it such an attractive alternative in a post silicon world.

Lately, research has been focused on coming up with different varieties of graphene better suited to electronics applications. A so-called “graphene monoxide (GMO)” looks promising, and an isotopically engineered graphene could find use in heat management applications for electronics. 

Researchers at the Samsung Advanced Institute of Technology have taken a different approach. Instead of altering the graphene, they have re-engineered the basic operating principles of digital switches.

They developed a three-terminal active device (described in the journal Science) in which the key feature is a “an atomically sharp interface between graphene and hydrogenated silicon.” The device, capable of switching on and off via a Schottky barrier that controls the flow of current by changing its height, does so without the graphene losing any of its precious electron mobility. 

Whenever you demonstrate a transistor, you get the usual refrain of: “Let me know when you make a simple logic circuit.” Ask and it shall be given. The Samsung researchers have reported the most basic logic gate (inverter) and logic circuits (half-adder) as part of their research, and demonstrated a basic operation (adding).

With nine patents already filed around this research, maybe this will be the way forward in bringing graphene to commercial electronics.

Nano Devices Based on Block Copolymers Could Lead to Next Generation of Computing


As far back as 2007 in the ITRS roadmap, the use of block copolymers has been targeted for reducing chip size. Since then they have been used to push the possibilities of self-assembled photoresists  as well as improve insulation within chips. 

During this period, researchers at CRANN, the nanoscience institute based at Trinity College Dublin—which partners with University College Cork (UCC)—along with researchers from the University of Wisconsin and Intel’s Researchers in Residence based in CRANN—namely, Professor Mick Morris of UCC—have been characterizing the block copolymer to better understand its self-assembling properties.

The results from the research, which were published in the journal Nanoscale, has demonstrated a method for fabricating large-area arrays of silicon nanowires through directed self-assembly of block copolymer nanopatterns that can be easily integrated into current manufacturing techniques.

In a press release issued by the Science Foundation of Ireland, Morris commented,  “The potential of our research is extremely exciting and reflects many years of hard work. This is the first time that anyone has demonstrated that large areas of nano-electronic devices can be developed in this fashion and highlights a pathway to commercial applications. I am looking forward to exploring commercial opportunities to further advance our work.”

Those associated with the project believe that the development could revolutionize the manufacturing of silicon chips and lead to a new generation of computers and real-time 3D video processing.

These types of claims are pretty regular in press releases covering this kind of research. In this case, however, given how deeply involved Intel was in the research one can’t help but give it a bit more credence than usual.



IEEE Spectrum’s nanotechnology blog, featuring news and analysis about the development, applications, and future of science and technology at the nanoscale.

Dexter Johnson
Madrid, Spain
Rachel Courtland
Associate Editor, IEEE Spectrum
New York, NY
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