Oxide nanosheets trump current state-of-the art capacitor materials

Mar 19, 2014
Oxide nanosheets trump current state-of-the art capacitor materials
Schematic illustration (left) and cross-sectional high-resolution TEM image (right) of the all-nanosheet ultrathin capacitor.

Electronics are getting smaller all the time, but there's a limit to how tiny they can get with today's materials. Takayoshi Sasaki and co-workers at the International Center for Materials Nanoarchitectonics, National Institute for Materials Science and Shinshu University in Japan have now developed a way to shrink capacitors, key components that store energy, even further, which could accelerate the development of more compact, high-performance next-generation devices.

Many recent improvements have already downsized capacitors significantly. But current technology has almost reached its limit in terms of and processing, which in turn limits the performance that manufacturers can achieve. In response, the researchers have gone to the nanoscale, but "nanocapacitors" are not easy to make.

Sasaki's team developed a LEGO-like approach, and they applied it to make high-performance ultrathin capacitors. They used conductive Ru0.95O20.2- and dielectric Ca2Nb3O10- nanosheets as core device components. By using solution-based assembly, they created a sandwich consisting of layers of two different types of oxide nanosheets to produce an ultrathin . The new capacitor has a stable capacitance density (~27.5μF cm-2), which is 2,000 times higher than that of currently available commercial products.

They see a number of possible extensions to the current work and conclude, "The virtually infinite varieties of oxide nanosheets, which can be used to assemble various nanosheet architectures, suggest that 2D heterointerfaces will offer an unprecedented versatility for the realization of new 2D states and molecularly thin film devices even beyond graphene."

Explore further: Advance in energy storage could speed up development of next-gen electronics

More information: "All-nanosheet ultrathin capacitors assembled layer-by-layer via solution-based processes." Chengxiang Wang, et al. ACS Nano, 2014; 140219070102009 DOI: 10.1021/nn406367p

add to favorites email to friend print save as pdf

Related Stories

New capacitors to improve electric vehicles

Aug 02, 2013

Scientists from the National Physical Laboratory (NPL) have developed a new lead-free, high temperature ceramic capacitor that could improve the efficiency and reliability of electric and hybrid vehicles.

Recommended for you

Demystifying nanocrystal solar cells

3 hours ago

ETH researchers have developed a comprehensive model to explain how electrons flow inside new types of solar cells made of tiny crystals. The model allows for a better understanding of such cells and may ...

Researchers use oxides to flip graphene conductivity

Jan 26, 2015

Graphene, a one-atom thick lattice of carbon atoms, is often touted as a revolutionary material that will take the place of silicon at the heart of electronics. The unmatched speed at which it can move electrons, ...

Researchers make magnetic graphene

Jan 26, 2015

Graphene, a one-atom thick sheet of carbon atoms arranged in a hexagonal lattice, has many desirable properties. Magnetism alas is not one of them. Magnetism can be induced in graphene by doping it with magnetic ...

The latest fashion: Graphene edges can be tailor-made

Jan 23, 2015

Theoretical physicists at Rice University are living on the edge as they study the astounding properties of graphene. In a new study, they figure out how researchers can fracture graphene nanoribbons to get ...

Nanotechnology changes behavior of materials

Jan 23, 2015

One of the reasons solar cells are not used more widely is cost—the materials used to make them most efficient are expensive. Engineers are exploring ways to print solar cells from inks, but the devices ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.