New method uses hydrogen plasma to smooth out wrinkles in graphene

Researchers from Nanjing University in China have developed a method to make large graphene films free of any wrinkles. The ultra-smooth films could enable large-scale production of electronic devices that harness the unique physical and chemical properties of graphene and other 2D materials.

Wrinkles  disappear when graphene is treated with a hydrogen plasma imageWrinkles in graphene films grown via chemical vapor deposition appear as jagged white lines at the top of this atomic force microscope image (left), but they disappear when the material is treated with a hydrogen plasma (right). Credit: Nature

Chemical vapor deposition (CVD) is the best-known method for making high-quality graphene sheets. It typically involves growing graphene by pumping methane gas onto copper substrates heated to temperatures around 1,000 °C, and then transferring the graphene to another surface such as silicon. But some of the graphene sticks to the copper surface, and as the graphene and copper expand and contract at different rates, wrinkles form in the graphene sheets. Such wrinkles often present hurdles for charge carriers and lower the film’s conductivity. Other researchers have tried to reduce wrinkles using low growth temperatures or special copper substrates, but the wrinkles have proven difficult to eliminate entirely, according to Libo Gao, a physicist at Nanjing University.

Graphene-Info updates all its graphene market report

Today we published new versions of all our graphene market reports. Graphene-Info provides comprehensive niche graphene market reports, and our reports cover everything you need to know about these niche markets. The reports are now updated to January 2020.

Graphene batteries market report 3D cover

The Graphene Batteries Market Report:

  • The advantages using graphene batteries
  • The different ways graphene can be used in batteries
  • Various types of graphene materials
  • What's on the market today
  • Detailed specifications of some graphene-enhanced anode material
  • Personal contact details into most graphene developers

The report package provides a good introduction to the graphene battery - present and future. It includes a list of all graphene companies involved with batteries and gives detailed specifications of some graphene-enhanced anode materials and contact details into most graphene developers. Read more here!

Log9 Materials bets on graphene-based aluminium fuel cells for future EVs

India-based Log9 Materials, believes that the key to better EVs is to focus on energy-generation, instead of energy storage. Log9 Materials says that a car powered by aluminium fuel cells can have a range of 1000 km post which the aluminium plates can be replaced within minutes.

According to Log9, aluminium fuel cells would primarily use three components – aluminium, water, and carbon in the form of graphene. In simple words, there’s water between layers of graphene, and when aluminium comes in contact with water, it corrodes – releasing energy. Log9 explains that procuring raw materials for aluminium fuel cells is much simpler than those for lithium-ion batteries which use lithium and cobalt, so manufacturing cost can be considerably lower for aluminium fuel cells than lithium-ion battery packs.

Meet the Graphene-Info team at MWC 2020

The Graphene-Info team is excited to announce its attendance at the Mobile World Congress 2020 on February 24-27 in Barcelona, Spain. The Mobile World Congress (MWC) is the world's largest gathering for the mobile industry, organized by the GSMA. It features a large exhibition, conference programme and networking opportunities.

For several years, the MWC event hosts a special graphene pavilion organized by the Graphene Flagship. This year, the Graphene Pavilion is promised to be even larger than before!

New graphene-based lithium-air battery may enable longer-running electric cars

Researchers at the Korean Daegu Gyeongbuk Institute of Science and Technology (DGIST) have fabricated an electrode using nickel cobalt sulphide nanoflakes on a sulfur-doped graphene, leading to a long-life battery with high discharge capacity. This improvement of lithium-air batteries' performance may bring us a step closer to electric cars that can use oxygen to run longer before they need to recharge.

"The driving distance of electric cars running on lithium-ion batteries is about 300 kilometers," says chemist Sangaraju Shanmugam of DGIST. "This means it's difficult to make a round trip between Seoul and Busan on these batteries. This has led to research on lithium-air batteries, due to their ability so store more energy and thus provide longer mileage."

New graphene-enhanced products raise old questions

When speaking of graphene in terms of commercialization, the general impression is that "a killer application has not yet been found". While this is not a false concept, it does not do justice with the now-budding graphene world. It can easily be stated that many graphene applications are being developed. This has been true for years, but various commercial products are starting to pop up, hopefully heralding the beginning of a more steady stream of commercialization.

Huawei Mate P30 Pro photo

Among these applications, one can point to cooling technology like Cryorig's CPU cooling system or Huawei's Mate 30 X smartphone, which sports a graphene film cooling technology. Various footwear and sports equipment products have also been launched, along with more technical products like oil additives and coatings. The list goes on and on, and there are even graphene-enhanced sanitary napkins on the market!