Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Improved synthesis of graphene oxide and its application to nanocomposites

Fig. 1. Promising applications of graphene oxide
Fig. 1. Promising applications of graphene oxide

Abstract:
Research Core for Interdisciplinary Sciences
Assistant Professor, Yuta Nishina

We have developed a method for the rapid preparation of graphene oxide (GO)a strategically important material for future technology (Fig.1).

The most common method for synthesizing GO is the Hummers' method (oxidation with KMnO4 and NaNO3 in concentrated H2SO4), which requires a long reaction time and large amounts of reagents. In our research found that the microwave irradiation of natural graphite flakes before the oxidation step improved the efficiency of the oxidation process. This facile method provides a greater amount of GO compared with the original Hummers' method. We expect our rapid synthesis method based on microwave irradiation to make a major contribution to the large-scale production of GO.

Improved synthesis of graphene oxide and its application to nanocomposites

Okayama, Japan | Posted on June 20th, 2013

Patent information: Japanese patent No.5098064

Graphene is a promising support material for Pt nanoparticles, which triggered much interest in metal/graphene composites. In some cases, however, graphene-supported metal species are not preferred, because the interaction between the metal particles and graphene is quite weak due to the graphene itself is being relatively chemically inert due to the strong sp2 and π binding between carbon atoms in the graphene plane. Consequently, the metal nanoparticles are mobile on graphene, which leads to limited applications of metal/graphene composites. It has been proposed that defects or mechanical strain in graphene can significantly increase the chemical reactivity of graphene itself and also enhance the interaction between metal nanoparticles.

Therefore, GO offers significant advantages for the synthesis of composites with inorganic materials and organic polymers due to its large amounts of oxygen functionality. As an application of our GO, metal nanoparticles were supported on its surface. We succeeded to synthesize Pt, Pd, Rh, Ir, Cu, etc. nanoparticles on GO via solution processes. Controlling the degree of oxidation of GO and the oxidation state of metal species will offer a wide range of applications of metal/GO composites such as electrodes, fuel cell catalysts, and catalysts for chemical synthesis. We showed that the Pd/GO composite exhibited superior catalytic activity in selective hydrogenation and cross coupling reactions.

Japanese patent application No.2012-201088

####

About Okayama University
Okayama University is one of the largest comprehensive universities in Japan with roots going back to the Medical Training Place sponsored by the Lord of Okayama and established in 1870. Now with 1,300 faculty and 14,000 students, the University offers courses in specialties ranging from medicine and pharmacy to humanities and physical sciences. Okayama University is located in the heart of Japan approximately 3 hours west of Tokyo by Shinkansen.

For more information, please click here

Contacts:
Okayama University
1-1-1 Tsushima-naka , Kita-ku ,
Okayama 700-8530, Japan
Planning and Public Information Division

Copyright © Okayama 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

Assistant Professor Yuta Nishina website:

Related News Press

News and information

Promising Step Taken in Iran towards Treatment of Spinal Cord Injury August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

Thin films offer promise for ferroelectric devices: Researchers at Tokyo Institute of Technology demystify the ferroelectric properties observed in hafnium-oxide-based thin films, revealing a potentially useful device material August 3rd, 2015

Kalam: versatility personified August 1st, 2015

Graphene

This could replace your silicon computer chips: A new semiconductor material made from black phosphorus may be a candidate to replace silicon in future tech July 30th, 2015

March 2016; 6th Int'l Conference on Nanostructures in Iran July 29th, 2015

Stretching the limits on conducting wires July 25th, 2015

More efficient process to produce graphene developed by Ben-Gurion University researchers July 23rd, 2015

Discoveries

Promising Step Taken in Iran towards Treatment of Spinal Cord Injury August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

Thin films offer promise for ferroelectric devices: Researchers at Tokyo Institute of Technology demystify the ferroelectric properties observed in hafnium-oxide-based thin films, revealing a potentially useful device material August 3rd, 2015

Self-assembling, biomimetic membranes may aid water filtration August 1st, 2015

Materials/Metamaterials

Thin films offer promise for ferroelectric devices: Researchers at Tokyo Institute of Technology demystify the ferroelectric properties observed in hafnium-oxide-based thin films, revealing a potentially useful device material August 3rd, 2015

Shaping the hilly landscapes of a semi-conductor nanoworld August 1st, 2015

Self-assembling, biomimetic membranes may aid water filtration August 1st, 2015

Transparent, electrically conductive network of encapsulated silver nanowires: A novel electrode for optoelectronics August 1st, 2015

Announcements

Promising Step Taken in Iran towards Treatment of Spinal Cord Injury August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

Thin films offer promise for ferroelectric devices: Researchers at Tokyo Institute of Technology demystify the ferroelectric properties observed in hafnium-oxide-based thin films, revealing a potentially useful device material August 3rd, 2015

Advances and Applications in Biosensing, Sensor Power, and Sensor R&D to be Covered at Sensors Global Summit August 1st, 2015

Patents/IP/Tech Transfer/Licensing

Quantum networks: Back and forth are not equal distances! July 28th, 2015

Reshaping the solar spectrum to turn light to electricity: UC Riverside researchers find a way to use the infrared region of the sun's spectrum to make solar cells more efficient July 27th, 2015

Smarter window materials can control light and energy July 22nd, 2015

Magnetic nanoparticles could be key to effective immunotherapy: New method moves promising strategy closer to clinical use July 15th, 2015

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project