Featured Research

from universities, journals, and other organizations

Super-strong graphene oxide: In situ bandgap tuning of graphene oxide achieved by electrochemical bias

Date:
January 30, 2014
Source:
International Center for Materials Nanoarchitectonics (MANA)
Summary:
The ability to modulate the physical properties of graphene oxide within electronic components could have numerous applications in technology. Super-strong graphene oxide (GO) sheets are useful for ultrathin, flexible nano-electronic devices, and display unique properties including photoluminescence and room temperature ferromagnetism.

The newly-fabricated EDL transistor with graphene oxide (GO) made by WPI-MANA researchers allows fine tuning of band gaps in the GO, meaning that conductivity, as well as magnetic and optical properties, can be carefully controlled.
Credit: MANA

The ability to modulate the physical properties of graphene oxide within electronic components could have numerous applications in technology.

Related Articles


Super-strong graphene oxide (GO) sheets are useful for ultrathin, flexible nano-electronic devices, and display unique properties including photoluminescence and room temperature ferromagnetism. Tsuchiya, Terabe and Aono at Japan's World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) are developing novel techniques that allow them to fine tune the physical properties of GO, such as conductivity, within working components.

The conductivity of GO is lower than graphene itself because of disruptions within its bonding structure. Specifically, the carbon atoms in GO exhibit a blurring of energy levels called sp2 or sp3 hybridizations. In ordinary GO, bonding in the sp2 level is disrupted, and under severe disruption the GO becomes an insulator rather than a conductor. Highly-reduced GO (rGO), with lower oxygen levels, has a near-perfect hexagonal lattice structure with strong bonds and high conductivity.

By adjusting the percentages of sp2 and sp3 domains in GO, Terabe and his team have gained the ability to fine tune band gaps and therefore control conductivity. Current methods of controlling bandgaps in GO are chemically-based, expensive, and cannot be used within electronic components themselves.

Now, the team have achieved non-volatile tuning of bandgaps in multi-layered GO within an all-solid-state electric double layer transistor (EDLT). The EDLT comprised GO on a silica glass substrate gated by a zirconia proton conductor. The team triggered a reversible electrochemical reduction and oxidation (redox) reaction at the GO/zirconia interface by applying a dc voltage. This in turn caused proton migration from GO through the zirconia (see image).

The redox reaction created rGO, and caused a fivefold increase in current in the transistor.

The rGO retained conductivity for more than one month without further voltage application. Compared with field-effect transistors, the new EDLT uses far less voltage to switch between on and off phases, meaning it is far cheaper to use. This new method for fine tuning conductivity could lead to control over optical and magnetic properties of components, with far-reaching applications.


Story Source:

The above story is based on materials provided by International Center for Materials Nanoarchitectonics (MANA). Note: Materials may be edited for content and length.


Journal Reference:

  1. Takashi Tsuchiya, Kazuya Terabe, Masakazu Aono. In Situ and Non-volatile Bandgap Tuning of Multilayer Graphene Oxide in an All-Solid-State Electric Double-Layer Transistor. Advanced Materials, 2013; DOI: 10.1002/adma.201304770

Cite This Page:

International Center for Materials Nanoarchitectonics (MANA). "Super-strong graphene oxide: In situ bandgap tuning of graphene oxide achieved by electrochemical bias." ScienceDaily. ScienceDaily, 30 January 2014. <www.sciencedaily.com/releases/2014/01/140130091349.htm>.
International Center for Materials Nanoarchitectonics (MANA). (2014, January 30). Super-strong graphene oxide: In situ bandgap tuning of graphene oxide achieved by electrochemical bias. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2014/01/140130091349.htm
International Center for Materials Nanoarchitectonics (MANA). "Super-strong graphene oxide: In situ bandgap tuning of graphene oxide achieved by electrochemical bias." ScienceDaily. www.sciencedaily.com/releases/2014/01/140130091349.htm (accessed December 21, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, December 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins