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Japanese smart diaper is destined to have a lot of crappy days
The current move towards wearables is surely good news for us, but unremittingly bad news for them. A flexible sensor developed at the University of Tokyo is about to discover just how bad when it's put to work as a sort of early warning system inside diapers. It's constructed from a printable organic circuit that detects changes in wetness, temperature and pressure, but apparently not smell (small mercies). It can charge wirelessly and transmit data wirelessly too, so that a caregiver holding a receiver can tell whether a baby or incontinent elderly person needs changing without having to unclothe them first. The device is expected to come to market as soon as its power efficiency has been improved, and we bet it can't wait.
IBM alliance sets efficiency record for solar power cells using common materials
There have been more than a few solar power efficiency records set in the past few months, let alone years. What makes IBM, DelSolar, Solar Frontier and Tokyo Ohka Kogyo think they can just waltz in and claim a record of their own? By using more commonplace elements in the periodic table, that's how. The partnership's new photovoltaic cell based on copper, zinc and tin (CZTS for short) can convert light rays to electric power with a 11.1 percent efficiency rate -- still nothing to upset traditional silicon power, but a large 10 percent more efficient than anything else in the class. In its early form, CZTS can already be manufactured through ink printing and could be produced in quantities equivalent to about 500 gigawatts of power per year, or five times more than some of the next-closest alternatives. The group wants to improve CZTS' efficiency over the course of the next several years, ideally reaching the point where it's useful as a truly cheap, ubiquitous source of power. We're looking forward to the day when there's a little slice of solar energy in just about everything, hopefully including a few more hybrid cars and private aircraft.
Copper-nickel nanowires from Duke University could make ubiquitous printable circuits
Nanowires, although they're building steam, still have to overcome the not-so-small problem of cost -- they often have to use indium tin oxide that's not just expensive, but fragile. Duke University has developed copper-nanowire films that could remedy this in style. The choice of material is both a hundred times less expensive to make than indium and is much more durable. It's flexible, too: if layered on as a coating, the nanowires would make for considerably more viable wearable electronics that won't snap under heavy stress. The catch, as you might suspect, stems from the copper itself, which doesn't conduct as much electricity as indium. The nickel will keep your copper electronics from oxidizing faster than the Statue of Liberty, however. Any practical use could be years away, but further successes from Duke could quickly see printable electronics hit the mainstream power and power our dreams of flexible displays.
Xerox announces silver ink, keeps printable electronics dream alive
Here comes Xerox, huffing and puffing its way back from obscurity with what it believes is a revolutionary new advancement. Its brand new silver ink and related printing technologies promise to make it possible for the lazy or breadboard handicapped among us to print their own circuit boards atop plastics, film, and even textiles. The wizardry of it lies in the company's development of a metallic ink with a melting point lower than that of plastics, which allows the former to be laid (in liquid form) atop the latter. It's all very neat, and the potential for flexible, lightweight, disposable electronics is well and good, but haven't we heard this all before?
OE-A shows off nonvolatile RAM, RFID tag formed by printing
While it's far from being noteworthy to the mainstream public, printable electronics hold a lot of promise. Over at Printable Electronics 2009 in Tokyo, the Organic Electronics Association (OE-A) demonstrated some of the most extreme, useful printings that we've seen to date. By utilizing an eclectic array of printing methods, the agency was able to produce nonvolatile RAM with a capacity of 1,024 bits (for use in ID and game cards) along with a printed RFID tag that could be launched today in logistics operations. We doubt very seriously that mere consumers will soon have access to printers of this nature, but if we can now print memory and wireless identification tags, one must wonder: what on Earth is next?
Researchers get one step closer to all-nanowire sensors
The latest in nanowire research has a crew at the University of California, Berkeley creating the very first integrated circuit "that uses nanowires as both sensors and electronic components." By utilizing a so-called "simple" printing technique, the researchers were able to create a batch of uniform circuits that could one day serve as image sensors. According to Ali Javey, an electrical-engineering professor at the institution, the goal is to "develop all-nanowire sensors" which could be used in a wide array of applications, and the benefit of using 'em is their exceptionally high level of sensitivity. In due time, the gurus would like to make everything on the circuit printable, though we have this strange feeling we won't be seeing any actual results from all of this for years to come.
Networks of carbon nanotubes find use in flexible displays
Carbon nanotubes may very well kill you (okay, so that's very much a stretch), but you'll have a hard time convincing the dutiful scientists at the University of Illinois at Urbana-Champaign to stop their promising research. Put simply (or as simply as possible), said researchers have discovered that "networks of single-walled carbon nanotubes printed onto bendable plastic perform well as semiconductors in integrated circuits." So well, in fact, that the nanotube networks could one day "replace organic semiconductors in applications such as flexible displays." Granted, there is still much to do before these networks are ready for product integration, but you can bet these folks aren't hitting the brakes after coming this far.
Transistors on paper become a reality
Check it, nerds. A team over at the Universidade Nova de Lisboa has reportedly figured out a way to use paper (yes, paper) as an interstrate component of a Field Effect Transistor (FET). In testing, the group "fabricated the devices on both sides of the paper sheet," thus causing the paper to act as the "electric insulator and as the substrate" simultaneously. Remarkably, results showed that performance actually rivaled that of best-in-class oxide thin film transistors, giving revived hope for the realm of disposable devices like paper displays, labels, intelligent packaging, tracking tags, etc. The findings are scheduled to be published this September, after which we're sure any firms interested in taking this stuff commercial will be putting their best foot forward.[Via Scientific Blogging]
GE researchers create printable, flexible OLEDs
Researchers at GE have created the world's first roll-to-roll manufactured OLEDs -- a newspaper printing-like process that is the first step to plentiful, cheaply produced, flexible lighting. Production of the thin, organic materials in this manner could lead to a wide array of innovations in the use of lights, sensors, and displays, and could make a noticeable impact on the efficiency and environmental performance of lighting and electronics. The company envisions a new playing-field for businesses, architects, and lighting designers who need access to cheap, energy-conscious materials, and see this research as a first step to an emerging field of commercialized OLED lighting. Yes, a new vista of discovery, wealth, and prosperity awaits those who take this bold step into the wide, wonderous, and uncharted worlds of scientific research and prototyping -- let's just hope it doesn't end up all Bioshock-y and weird.[Via MetaEfficient]
Researchers develop scalable circuit printing technique
As if there weren't enough "almost theres" in the world of printable circuits, now we've got yet another team developing their own iteration of a printing press for electronics. The group, which includes scientists from DuPont and Organic ID, has reportedly "fabricated a printing plate used to print the source-drain level of an array of thin-film transistors," essentially solving some of the low-resolution constraints seen on prior competition. The goal is to eventually posses the ability to "print large, flexible circuits using machines similar to printing presses," and while it seems to be a ways from commercialization, initial testing and comparisons to more traditionally-created transistors have produced glowing results.[Image courtesy of HowStuffWorks]
