Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > High Quality Three-Dimensional Nanoporous Graphene

Nanoporous graphene on nanoporous Ni (left) and Nanoporous graphene after dissolving the nanoporous Ni substrate.
Nanoporous graphene on nanoporous Ni (left) and Nanoporous graphene after dissolving the nanoporous Ni substrate.

Abstract:
Three-dimentional (3D) nanoporous graphene with preserved 2D Dirac electronic characters was successfully synthesized by Dr. Yoshikazu Ito and Prof. Mingwei CHEN at Advanced Institute for Materials Research, Tohoku University. The nanoporous graphene is constructed by a single layer graphene sheet that is continuously inter-connected to form a complex 3D network structure. This free-standing nanoporous graphene with an excellent crystallinity possesses high mobility, holding great promise for the applications in electronic devices.

High Quality Three-Dimensional Nanoporous Graphene

Katahira, Japan | Posted on May 2nd, 2014

The nanoporous graphene were grown by a nanoporous metal based chemical vapor deposition (CVD) method as shown in Figure 1(a). The overall morphology of the nanoporous graphene in Figure 1(b) shows a ~20 Ám thick free-standing bulk sheet. Although the 3D nanoporous graphene has a complex structure, it is demonstrated to be 500 cm2/Vs in electron mobility and a mass-less Dirac cone system. As the conventional transistor requires electron mobility of 200 cm2/Vs, it is greatly expected that this nanoporous graphene will bring a new device which can be replaced with Si devices.

This work is collaborated with the research teams of Prof. Katsumi Tanigaki and Prof. Takashi Takahashi at AIMR, Tohoku University. This research results will be published in issue 19 of 'Angewandte Chemie International Edition' as a Hot Paper on 2 May.

Introduction

Graphene is a mono-layer carbon material with low cost, high chemical/thermal stability, and ultrahigh strength and is expected to be a replacement of silicon and noble metals for electron devices, battery materials, photo-/ion detectors and catalysts. Although some of graphene products such as display and electrodes are commercially available, the applications are limited due to the 2D sheet structure. In other words, the performance per gram is excellent but the performance per volume cannot be achieved easily. Therefore, many efforts have been made to construct the 2D material as a 3D structure with retained physical/chemical properties and high volumetric performance. However, the reported 3D nanoporous carbon materials suffer from poor mobility because of the lower crystallinity, which cannot be used for the electron devices. To achieve semiconductor-grade 3D carbon materials, the monolayer graphene sheet with a high crystalline structure is required in a 3D structure. Thus, we have developed a 3D nanoporous graphene with preserved high mobility and unique 2D electronic properties of graphene.
Research content

The nanoporous graphene in Figure 1 were synthesized by the nanoporous metal based CVD method. The nanoporous graphene fully inherits the geometric structure of the nanoporous nickel substrate after dissolving nickel. The atomic structure of the nanoporous graphene was observed by TEM as shown in Figure 2. The ligament in Figure 2(a) were constructed by flat surface parts (Figure 2(b)) and curvature parts (Figure 2(c)) of the graphene sheet. It is obvious that the six-membered rings were observed in the flat part while the five- and seven-membered rings were observed in the curved parts due to the geometrical requirement to create the curvature structures.

The physical properties of the nanoporous graphene were investigated. As the 2D graphene is a Dirac cone system (Figure 3(a)) and shows a linear dispersion electronic density of state (Figure 3(b)). The 3D nanoporous graphene in Figure 2 also demonstrates a linear relationship near the Fermi level, which is similar with the 2D graphene. The electron mobility of the nanoporous graphene with different pore sizes was measured. As the temperature increase, the electron mobility slightly decreases to 200-400 cm2/Vs. As compared with 2D CVD graphene, the electron mobility is still high enough for device applications.

In conclusion, the nanoporous graphene preserves 2D graphene futures. These findings are firstly reported for revealing the physical properties of 3D nanoporous graphene.
Future visions

The 3D nanoporous graphene is expected to bring breakthrough of solving a problem of volumetric performance of 2D graphene by providing abundant porous structures for an easy mass transport and large effective surface area. Moreover, the nanoporous graphene preserves 2D graphene electronic characters and expected to be employed for applications in electronic devices such as a transistors and condensers.
Acknowledgement

We appreciate the supports from JST-CREST "Phase Interface Science for Highly Efficient Energy Utilization"; the fusion research funds of "World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials", MEXT (Japan).

####

For more information, please click here

Contacts:
Yasufumi Nakamichi

81-222-176-146



About research (experiment and theory)

Mingwei Chen (PI, Professor)
Advanced Institute for Materials Research (AIMR), Tohoku University, Chen group


About Media Relations
Yasufumi Nakamichi (Manager, Assistant Professor)
Advanced Institute for Materials Research (AIMR), Tohoku University, PR & Outreach office

Copyright © Advanced Institute for Materials Research (AIMR), Tohoku Uni

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

Publication Information

Related News Press

News and information

Materials for the next generation of electronics and photovoltaics: MacArthur Fellow develops new uses for carbon nanotubes October 21st, 2014

Special UO microscope captures defects in nanotubes: University of Oregon chemists provide a detailed view of traps that disrupt energy flow, possibly pointing toward improved charge-carrying devices October 21st, 2014

Super stable garnet ceramics may be ideal for high-energy lithium batteries October 21st, 2014

Could I squeeze by you? Ames Laboratory scientists model molecular movement within narrow channels of mesoporous nanoparticles October 21st, 2014

Graphene

Nitrogen Doped Graphene Characterized by Iranian, Russian, German Scientists October 21st, 2014

Graphenea opens US branch October 16th, 2014

Charged graphene gives DNA a stage to perform molecular gymnastics October 9th, 2014

Unconventional photoconduction in an atomically thin semiconductor: New mechanism of photoconduction could lead to next-generation excitonic devices October 9th, 2014

Chip Technology

Materials for the next generation of electronics and photovoltaics: MacArthur Fellow develops new uses for carbon nanotubes October 21st, 2014

Nitrogen Doped Graphene Characterized by Iranian, Russian, German Scientists October 21st, 2014

Crystallizing the DNA nanotechnology dream: Scientists have designed the first large DNA crystals with precisely prescribed depths and complex 3D features, which could create revolutionary nanodevices October 20th, 2014

Imaging electric charge propagating along microbial nanowires October 20th, 2014

Discoveries

Special UO microscope captures defects in nanotubes: University of Oregon chemists provide a detailed view of traps that disrupt energy flow, possibly pointing toward improved charge-carrying devices October 21st, 2014

Super stable garnet ceramics may be ideal for high-energy lithium batteries October 21st, 2014

Could I squeeze by you? Ames Laboratory scientists model molecular movement within narrow channels of mesoporous nanoparticles October 21st, 2014

Detecting Cancer Earlier is Goal of Rutgers-Developed Medical Imaging Technology: Rare earth nanocrystals and infrared light can reveal small cancerous tumors and cardiovascular lesions October 21st, 2014

Materials/Metamaterials

Materials for the next generation of electronics and photovoltaics: MacArthur Fellow develops new uses for carbon nanotubes October 21st, 2014

Super stable garnet ceramics may be ideal for high-energy lithium batteries October 21st, 2014

Could I squeeze by you? Ames Laboratory scientists model molecular movement within narrow channels of mesoporous nanoparticles October 21st, 2014

Removal of Limitations of Composites at Superheat Temperatures October 20th, 2014

Announcements

Special UO microscope captures defects in nanotubes: University of Oregon chemists provide a detailed view of traps that disrupt energy flow, possibly pointing toward improved charge-carrying devices October 21st, 2014

Super stable garnet ceramics may be ideal for high-energy lithium batteries October 21st, 2014

Could I squeeze by you? Ames Laboratory scientists model molecular movement within narrow channels of mesoporous nanoparticles October 21st, 2014

Detecting Cancer Earlier is Goal of Rutgers-Developed Medical Imaging Technology: Rare earth nanocrystals and infrared light can reveal small cancerous tumors and cardiovascular lesions October 21st, 2014

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals

Special UO microscope captures defects in nanotubes: University of Oregon chemists provide a detailed view of traps that disrupt energy flow, possibly pointing toward improved charge-carrying devices October 21st, 2014

Could I squeeze by you? Ames Laboratory scientists model molecular movement within narrow channels of mesoporous nanoparticles October 21st, 2014

Detecting Cancer Earlier is Goal of Rutgers-Developed Medical Imaging Technology: Rare earth nanocrystals and infrared light can reveal small cancerous tumors and cardiovascular lesions October 21st, 2014

Nitrogen Doped Graphene Characterized by Iranian, Russian, German Scientists October 21st, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE