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Graphene Allows Your Contact Lenses To See Infrared Images It sounds like an espionage thriller, and you can see infrared images as long as you put on a pair of contact lenses. Researchers at the University of Michigan turned their glasses into a reality, using graphene to develop fingernails-sized infrared image sensors without the need for bulky cooling devices. Because of its small size, light weight, it can be integrated into contact lenses or mobile phones, in the military, security, medicine and other fields have a wide range of applications. The study was published in the journal Nature Nanotechnology. Infrared wavelength between 760 nm to 1 mm, is the wavelength than red light of the longer than visible, divided into near infrared, medium infrared and far infrared three kinds. Both the IR and the far infrared sensors usually have to work at very low temperatures. Chong (Zhaohui Zhong), assistant professor of electrical engineering and computer science at the University of Michigan, and his team improved the process of producing electrical signals from graphene, setting up an insulating layer between two graphene flakes with an electric current through. When the light hits the top graphene, the device releases electrons and creates a positively charged hole. Then, under the quantum tunneling effect, electrons pass through the middle insulating layer and reach the bottom of the graphene layer. At this point, the positively charged holes remaining on the upper graphene will produce an electric field and affect the current of the lower graphene. By measuring the change of the current, the brightness of the light irradiated on the upper graphene can be inferred. Chong said the new method first allowed the sensitivity of both the IR and far-infrared sensors to a new height that could be comparable to a traditional infrared sensor that required a cooling device to run.
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Zvuči kao špijunski triler i možete vidjeti infracrvene slike sve dok stavite na par kontaktnih leća. Istraživači na Sveučilištu u Michiganu pretvorili su svoje čaše u stvarnost koristeći grafen kako bi razvili senzore infracrvenih slika veličine noktiju, bez potrebe za glomaznim uređajima za hlađenje. Zbog male veličine, male težine, može se integrirati u kontaktne leće ili mobilne telefone, u vojnoj, sigurnosnoj, medicinskoj i drugim područjima imaju širok raspon aplikacija. Studija je objavljena u časopisu Nature Nanotechnology. Infracrvena valna duljina između 760 nm i 1 mm je valna duljina od crvene svjetlosti duže od vidljive, podijeljena na infracrvene, srednje infracrvene i daleko infracrvene tri vrste. I IR i daljin infracrveni senzori obično moraju raditi na vrlo niskim temperaturama. Chong (Zhaohui Zhong), pomoćnik profesora elektrotehnike i računarstva na Sveučilištu u Michiganu, i njegov tim poboljšali su proces proizvodnje električnih signala iz grafena, postavljajući izolacijski sloj između dva grafitna pahuljica s električnom strujom. Kad svjetlo dotakne gornji grafen, uređaj oslobađa elektrone i stvara pozitivno napunjenu rupu. Zatim, pod efektom kvantnog tunela, elektroni prolaze kroz srednji izolacijski sloj i dostižu dno sloj grafena. U ovom trenutku, pozitivno nabijene rupe koje ostaju na gornjem grafenu će proizvesti električno polje i utjecati na struju donjeg grafena. Mjerenjem promjene struje može se zaključiti svjetlost svjetlosti koja se zrači na gornjem grafenu. Chong je izjavio kako je nova metoda najprije dopustila osjetljivost IR i far-infracrvenog senzora na novu visinu koja bi mogla biti usporediva s tradicionalnim infracrvenim senzorom koji je zahtijevao pokretanje rashladnog uređaja.