Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Study unlocks full potential of 'supermaterial' graphene: Researchers remove silicon contamination from graphene to double its performance

Drs. Esrafilzadeh and Jalili working on 3D-printed graphene mesh in the lab.

CREDIT
RMIT University
Drs. Esrafilzadeh and Jalili working on 3D-printed graphene mesh in the lab. CREDIT RMIT University

Abstract:
New research reveals why the "supermaterial" graphene has not transformed electronics as promised, and shows how to double its performance and finally harness its extraordinary potential.

Study unlocks full potential of 'supermaterial' graphene: Researchers remove silicon contamination from graphene to double its performance

Melbourne, Australia | Posted on November 30th, 2018

Graphene is the strongest material ever tested. It's also flexible, transparent and conducts heat and electricity 10 times better than copper.

After graphene research won the Nobel Prize for Physics in 2010 it was hailed as a transformative material for flexible electronics, more powerful computer chips and solar panels, water filters and bio-sensors. But performance has been mixed and industry adoption slow.

Now a study published in Nature Communications identifies silicon contamination as the root cause of disappointing results and details how to produce higher performing, pure graphene.

The RMIT University team led by Dr Dorna Esrafilzadeh and Dr Rouhollah Ali Jalili inspected commercially-available graphene samples, atom by atom, with a state-of-art scanning transition electron microscope.

"We found high levels of silicon contamination in commercially available graphene, with massive impacts on the material's performance," Esrafilzadeh said.

Testing showed that silicon present in natural graphite, the raw material used to make graphene, was not being fully removed when processed.

"We believe this contamination is at the heart of many seemingly inconsistent reports on the properties of graphene and perhaps many other atomically thin two-dimensional (2D) materials ," Esrafilzadeh said.

"Graphene was billed as being transformative, but has so far failed to make a significant commercial impact, as have some similar 2D nanomaterials. Now we know why it has not been performing as promised, and what needs to be done to harness its full potential."

The testing not only identified these impurities but also demonstrated the major influence they have on performance, with contaminated material performing up to 50% worse when tested as electrodes.

"This level of inconsistency may have stymied the emergence of major industry applications for graphene-based systems. But it's also preventing the development of regulatory frameworks governing the implementation of such layered nanomaterials, which are destined to become the backbone of next-generation devices," she said.

The two-dimensional property of graphene sheeting, which is only one atom thick, makes it ideal for electricity storage and new sensor technologies that rely on high surface area.

This study reveals how that 2D property is also graphene's Achilles' heel, by making it so vulnerable to surface contamination, and underscores how important high purity graphite is for the production of more pure graphene.

Using pure graphene, researchers demonstrated how the material performed extraordinarily well when used to build a supercapacitator, a kind of super battery.

When tested, the device's capacity to hold electrical charge was massive. In fact, it was the biggest capacity so far recorded for graphene and within sight of the material's predicted theoretical capacity.

In collaboration with RMIT's Centre for Advanced Materials and Industrial Chemistry, the team then used pure graphene to build a versatile humidity sensor with the highest sensitivity and the lowest limit of detection ever reported.

These findings constitute a vital milestone for the complete understanding of atomically thin two-dimensional materials and their successful integration within high performance commercial devices.

"We hope this research will help to unlock the exciting potential of these materials."

####

For more information, please click here

Contacts:
Michael Quin

61-499-515-417

Copyright © Rmit University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

The article "Silicon as a ubiquitous contaminant in graphene derivatives with significant impact on device performance" is published in Nature Communications: DOI: 10.1038/s41467-018-07396-3:

Related News Press

News and information

The lightest shielding material in the world: Protection against electromagnetic interference July 3rd, 2020

Spintronics: Faster data processing through ultrashort electric pulses July 3rd, 2020

A path to new nanofluidic devices applying spintronics technology: Substantial increase in the energy conversion efficiency of hydrodynamic power generation via spin currents July 3rd, 2020

Towards lasers powerful enough to investigate a new kind of physics: An international team of researchers has demonstrated an innovative technique for increasing the intensity of lasers July 3rd, 2020

Graphene/ Graphite

Charcoal a weapon to fight superoxide-induced disease, injury: Nanomaterials soak up radicals, could aid treatment of COVID-19 July 2nd, 2020

Researchers discover new boron-lanthanide nanostructure June 25th, 2020

Transparent graphene electrodes might lead to new generation of solar cells: New roll-to-roll production method could enable lightweight, flexible solar devices and a new generation of display screens June 8th, 2020

Graphene nanotubes help to prevent losses at grain elevators June 2nd, 2020

Oriented hexagonal boron nitride foster new type of information carrier May 22nd, 2020

Flexible Electronics

SUTD developed a simple method to print planar microstructures of polysiloxane: The new method, embedded ink writing (EIW), enables direct writing of polysiloxane which helps in the fabrication of microfluidic devices, flexible wearables, and soft actuators May 29th, 2020

Stress-relief substrate helps OLED stretch two-dimensionally? February 28th, 2020

Researchers to develop a theory of transients in graphene: The research considers behavior of graphene in the moment of its transition from the state of thermal equilibrium and the process of returning to this state December 27th, 2019

Possible Futures

Spintronics: Faster data processing through ultrashort electric pulses July 3rd, 2020

A path to new nanofluidic devices applying spintronics technology: Substantial increase in the energy conversion efficiency of hydrodynamic power generation via spin currents July 3rd, 2020

Towards lasers powerful enough to investigate a new kind of physics: An international team of researchers has demonstrated an innovative technique for increasing the intensity of lasers July 3rd, 2020

Crystal structure discovered almost 200 years ago could hold key to solar cell revolution July 3rd, 2020

Chip Technology

Spintronics: Faster data processing through ultrashort electric pulses July 3rd, 2020

A path to new nanofluidic devices applying spintronics technology: Substantial increase in the energy conversion efficiency of hydrodynamic power generation via spin currents July 3rd, 2020

Extensive review of spin-gapless semiconductors: Next-generation spintronics candidates: spin-gapless semiconductors (SGSs) bridge the zero-gap materials and half-metals June 26th, 2020

Process for 'two-faced' nanomaterials may aid energy, information tech June 26th, 2020

Sensors

Polymers can fine-tune attractions between suspended nanocubes: Interactions between hollow silica nanocubes suspended in a solution can be adjusted by varying the concentration of polymer molecules added to the mixture. June 19th, 2020

Single-spin electron paramagnetic resonance spectrum with kilohertz spectral resolution June 19th, 2020

Surrey reveals its implantable biosensor that operates without batteries May 22nd, 2020

Making quantum 'waves' in ultrathin materials: Study co-led by Berkeley Lab reveals how wavelike plasmons could power up a new class of sensing and photochemical technologies at the nanoscale May 15th, 2020

Discoveries

The lightest shielding material in the world: Protection against electromagnetic interference July 3rd, 2020

Spintronics: Faster data processing through ultrashort electric pulses July 3rd, 2020

A path to new nanofluidic devices applying spintronics technology: Substantial increase in the energy conversion efficiency of hydrodynamic power generation via spin currents July 3rd, 2020

Towards lasers powerful enough to investigate a new kind of physics: An international team of researchers has demonstrated an innovative technique for increasing the intensity of lasers July 3rd, 2020

Announcements

Towards lasers powerful enough to investigate a new kind of physics: An international team of researchers has demonstrated an innovative technique for increasing the intensity of lasers July 3rd, 2020

Crystal structure discovered almost 200 years ago could hold key to solar cell revolution July 3rd, 2020

Flexible material shows potential for use in fabrics to heat, cool July 3rd, 2020

Carbon-loving materials designed to reduce industrial emissions July 3rd, 2020

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

A path to new nanofluidic devices applying spintronics technology: Substantial increase in the energy conversion efficiency of hydrodynamic power generation via spin currents July 3rd, 2020

Towards lasers powerful enough to investigate a new kind of physics: An international team of researchers has demonstrated an innovative technique for increasing the intensity of lasers July 3rd, 2020

Crystal structure discovered almost 200 years ago could hold key to solar cell revolution July 3rd, 2020

Flexible material shows potential for use in fabrics to heat, cool July 3rd, 2020

Water

Two is better than one: Scientists fit two co-catalysts on one nanosheet for better water purification April 16th, 2020

Electric jolt to carbon makes better water purifier March 24th, 2020

Water-free way to make MXenes could mean new uses for the promising nanomaterials: Discovery by Drexel researchers could open new application for MXene materials March 13th, 2020

Extraction of lithium from its largest source, i.e. seawater, by nanostructured membranes January 27th, 2020

Solar/Photovoltaic

Crystal structure discovered almost 200 years ago could hold key to solar cell revolution July 3rd, 2020

Printed perovskite LEDs: An innovative technique towards a new standard process of electronics manufacturing June 12th, 2020

Transparent graphene electrodes might lead to new generation of solar cells: New roll-to-roll production method could enable lightweight, flexible solar devices and a new generation of display screens June 8th, 2020

Twisting 2D materials uncovers their superpowers: Researchers have developed a completely new method for twisting atomically thin materials, paving the way for applications of 'twistronics' based on tunable 2D materials May 12th, 2020

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project