Semiconducting nanonetwork could form the backbone of transparent flexible electronics

first_img Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. The researchers, led by Kwanghee Lee, a professor at the Gwangju Institute of Science and Technology in South Korea, have published a paper on the new material in the Proceedings of the National Academy of Sciences. “So far, there has been no semiconducting material that simultaneously achieves excellent optical transparency, high charge-carrier mobility, and real flexibility,” coauthor Kilho Yu at the Gwangju Institute of Science and Technology told Phys.org. “Metal oxides, such as ZnO and IGZO, have excellent transparency and high mobility, but they are brittle and show poor mobility if not treated with high-temperature (>200 °C) processes, which are not desirable for fabrication on flexible substrates. General semiconducting polymers are flexible, but show poor mobility without complex processes and are not very transparent because of their high optical absorption coefficient.”The new polymer blend consists of about 15% semiconducting polymer called DPP2T integrated into an inert polystyrene matrix. The two types of polymers do not mix uniformly, but instead the DPP2T forms a web-like nanonetwork through the inert matrix, creating highly ordered, continuously connected charge pathways for rapid charge transport. So far, transparency has been particularly challenging to achieve in semiconducting polymers because of their inherently high light absorption in the visible range. DPP2T belongs to a newer class of semiconducting polymers in which the light absorption peak is red-shifted to the near-infrared range, so it absorbs much less light in the visible range and has greater optical transparency. However, DPP2T by itself still has a greenish tint. Only by blending the DPP2T with the polystyrene matrix could the researchers fabricate a material that is almost perfectly transparent throughout the visible range.In the final analysis, the researchers showed that the individual materials in the polymer blend cannot achieve all three of the desired properties on their own, but only when blended together. © 2017 Phys.org Field-effect transistors integrated with LEDs, showing transparency and flexibility. Credit: Yu et al. ©2016 PNAS Graphene produces more efficient transport of a semiconducting polymer film Photograph of the flexible, transparent field-effect transistor made of the new material. Credit: Yu et al. ©2016 PNAS Citation: Semiconducting nanonetwork could form the backbone of transparent, flexible electronics (2017, January 13) retrieved 18 August 2019 from https://phys.org/news/2017-01-semiconducting-nanonetwork-backbone-transparent-flexible.html More information: Kilho Yu et al. “Optically transparent semiconducting polymer nanonetwork for flexible and transparent electronics.” Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.1606947113 To demonstrate, the researchers fabricated prototypes of colorless, bendable field-effect transistors integrated on top of colorless, bendable light-emitting diodes. The devices could withstand 1,000 bending cycles with no severe performance degradation. (Phys.org)—Researchers may have found a “sweet spot” for organic electronics by fabricating a new 2D semiconducting polymer-blended nanonetwork material that simultaneously achieves excellent charge mobility, high flexibility, and nearly 100% optical transparency—a combination of properties that has so far been elusive for semiconducting materials. According to the researchers, the nanonetwork is the first truly colorless, bendable semiconducting material, as demonstrated by the fabrication of field-effect transistors with integrated LEDs. “The nanonetwork semiconductor can be made very easily and is solution-processable, and it needs no heat treatment or any other complex processes,” Yu said. “It simultaneously achieves excellent characteristics for future transparent, deformable electronic applications. The applicability of the nanonetwork semiconductor was proven by the fabrication drive of prototype FET/OLED integrated devices. In the paper, we also have shown a new paradigm for achieving facile charge transport in semiconducting polymers, which emphasizes the importance of clean charge pathways along the polymer backbone, rather than the degree of crystallinity of the polymer.”The researchers expect that the results will pave the way for the development of a wide variety of applications, such as next-generation “see-through” bendable electronics and skin-attachable medical devices.”We are currently investigating the intriguing charge transport mechanism of the nanonetwork semiconductor using various experimental tools and modeling,” Yu said. “In addition, we are applying this nanonetwork semiconductor toward various electronic applications, in order to make it a platform technology for deformable and transparent electronics.” Journal information: Proceedings of the National Academy of Scienceslast_img read more

The 5 Takeaways from the Coyotes introduction of

first_img The 5: Takeaways from the Coyotes’ introduction of Alex Meruelo While a forearm injury kept Mike Glennon out of Friday’s game, you wonder if a trade is imminent and inevitable, a good-faith gesture to a player who showed up first but has found little opportunity in Arizona.A maligned group of wide receivers just took a big step in soothing our worst fears. Christian Kirk could have posted two jaw-dropping touchdowns in his first two preseason games, had he not tripped over the grass on his inaugural punt return. In the post-game glow, offensive lineman Justin Pugh compared him to Odell Beckham Jr., his former teammate in New York.That was an unexpected sound bite, and it seemed to settle the search for a viable No. 2 receiver. The rest of the crew is still benign and non-threatening, but at least they catch the football when thrown to them, likely a byproduct of pinpoint passing from their quarterbacks.The defense remains something of a mystery — up and down, too often gashed in the running game. They are also rich in playmakers credited with eight turnovers in the first two games.Tackle Robert Nkemdiche remains enigmatic, inconsistent and susceptible to lower leg injuries. Third-year corner Brandon Williams will be fighting for his job in the coming days while end Markus Golden has yet to take the field. But safety Tre Boston is a gem, Bene Benwikere is a surprising addition at cornerback and the new head coach is surely saving a few surprises. After all, if Steve Wilks is so impressive with all the other stuff, it’s fair to assume his area of expertise (defense) will follow suit in the near future.It’s also important to breathe deep and remember the delusions of low-risk football, how all that glitters will mean little in September. Too many NFL impact players are slow-rolling their way into the regular season, and once they get down to business, it will completely change the landscape and the optics. Play callers and defensive coordinators know better than to try hard and show too much, thereby luring rookies into a false sense of security. The greatest team in NFL history – the 1985 Bears – went 1-3 in the preseason, starting with a 10-3 loss to the St. Louis Cardinals.But for a team predicted to rank among the bottom feeders of the NFL, the 2018 Cardinals couldn’t look better after two preseason games. The running back without a contract extension seems unstoppable and exhilarated. The quarterbacks are better than expected. Larry Fitzgerald’s advice to bet the over in Las Vegas, where Arizona is on the board for 5.5 wins, seems to be prophetic advice.Alas, the NFL is never as easy as it seems in August. The Cardinals can’t give you meaningful victories until the scam and charade of preseason football is over. But a revamped team seems to act smart, hit hard and block well, emitting an unmistakable scent in Arizona: Preseason football is a blur of blah. Trust nothing when the final score doesn’t matter.But every now and then, there’s a play that changes everything. Like David Johnson’s nine-yard touchdown run against the Saints on Friday, when there was no room to run but plenty of friends to follow, when he simply churned along with a moving pile all the way into the end zone.It was the first highlight-reel moment for the Cardinals’ offensive line. Maybe their first declaration as well. There are well-worn paths to NFL superiority. An elite quarterback is the fast lane. A great defense is a pickup truck plowing through mud. A juggernaut offense is the sports car that goes fast but not far, not to be trusted in inclement weather.Or you do it the hard way. Like the 2018 Cardinals.Of all the changes accompanying the new regime in Arizona, there is something afoot, something the eyes can trust. There is a new physicality that quickens the pulse, mostly from an offensive line that has long been the scourge in these parts.The loss of center A.Q. Shipley hasn’t been a problem because Mason Cole is just what you hoped from a Michigan rookie, hard to move and eager to please. Left guard Mike Iupati is once again healthy and hard as steel, a bulldozer in the running game.Related LinksCB Benwikere hoping to make most of opportunity with CardinalsCardinals’ regular-season routine in effect, Robert Nkemdiche day-to-dayWilks: Cardinals QB Mike Glennon dealing with forearm injuryThe 5: Key observations from Arizona Cardinals’ win over SaintsThe unit set the tone in New Orleans, in the first road game of the preseason, inside a hostile building full of passionate fans. The Cardinals made it look easy. Like they could pave the way for David Johnson, NFL MVP.It’s dangerous to feel too comfortable about their 20-15 victory over the Saints. But Josh Rosen is thriving between the ears, ahead of the game and not behind. Sam Bradford moves quickly and seems in full command, despite Rosen’s presence. The quarterback room is trending in the right direction, built on quick hits, smart reads and extremely accurate passing. It’s called hope.Reach Bickley at dbickley@bonneville.com. Listen to Bickley & Marotta weekdays from 10 a.m. – 2 p.m. on 98.7 FM Arizona’s Sports Station. Arizona Cardinals running back David Johnson (31) carries in the first half of an NFL preseason football game against the New Orleans Saints in New Orleans, Friday, Aug. 17, 2018. (AP Photo/Gerald Herbert)center_img Grace expects Greinke trade to have emotional impact Former Cardinals kicker Phil Dawson retires Top Stories Derrick Hall satisfied with D-backs’ buying and selling 15 Comments   Share   last_img read more

Watch Updated Migrants finally disembark in Lampedusa

first_img <a href=’http://revive.newsbook.com.mt/www/delivery/ck.php?n=ab2c8853&amp;cb={random}’ target=’_blank’><img src=’https://revive.newsbook.com.mt/www/delivery/avw.php?zoneid=97&amp;cb={random}&amp;n=ab2c8853&amp;ct0={clickurl_enc}’ border=’0′ alt=” /></a> SharePrint The 41 asylum seekers on board the MV Alex have now been allowed to disembark in Lampedusa early on Sunday after hours of waiting guarded by law enforcement officials as the vessel was seized as soon as it berthed.  Confermiamo: i naufraghi soccorsi dal veliero #Alex di #Mediterranea stanno finalmente sbarcando per ricevere cura e assistenza. Siamo felici per le straordinarie persone che abbiamo avuto il privilegio di aiutare. pic.twitter.com/SGSS4tHKJr— Mediterranea Saving Humans (@RescueMed) July 6, 2019This was reported by the BBC who also said that the captain of the vessel, which is operated by the NGO Mediterranea – Saving Humans had docked at Lampedusa ignoring the ban set by the Italian authorities “out of necessity”. The ban was confirmed by Italy’s Interior Minister Matteo Salvini over Twitter. Non autorizzo nessuno sbarco di chi se ne frega delle leggi italiane e aiuta gli scafisti. Io denunciato per sequestro di persona? Siamo al ridicolo. #Alex pic.twitter.com/V1KjccP6BF— Matteo Salvini (@matteosalvinimi) July 6, 2019AlJazeera divulged that the Italian government had asked Mediterranea to sail to Malta; however the NGO deemed that the longer trip was too dangerous for the rescuees on board. EarlierA group of more than 40 asylum seekers on board the sailing boat Alex operated by Italian platform Mediterranea – Saving Human have been brought to safety in Lampedusa. The group makes part of 55 asylum seekers who had to be brought over to Malta according to a government statement on Friday.READ: Update: Migrants still awaiting on MV AlexThe government had issued a statement saying that 55 rescuees on board Alex would be brought to safety on Malta. The Maltese Maritime Rescue Coordination Centre had made contact with the vessel at 5.17am on Friday and made it be known that “as a sign of good will” the Maltese government was willing to allow the saved souls to disembark in Malta.  The statement by the Government on Friday reiterated that Malta was under no legal obligation to offer a port of safety.The crew of the MV Alex explained that due to the conditions of the migrants and the vessel’s characteristics, they cannot berth for the migrants to disembark in Malta and therefore asked for assistance from the AFM patrol boats or the Italian coast guard.However sources told Newsbook.com.mt that the Armed Forces of Malta were never instructed to go out and bring the asylum seekers in, saying that the agreement was at a political level. On the other hand, Italian newspaper La Republica reported that the AFM had refused Mediterranea’s request for transfer even though the 18m long sailing boat was in no condition to sail for another night with 70 people on board. The Italian newspaper reported that Maltese authorities said that assigning a port of safety was an exceptional political concession.Video: Twitter / Iason ApostolopoulosWhatsApplast_img read more