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Graphene and porphyrins join to create an exciting new material

Jan 08, 2017

Researchers at the Technical University of Munich have found that graphene can be combined with porphyrins, the molecules that convey oxygen in haemoglobin and absorb light during photosynthesis, to get a material with exciting new properties. The resulting hybrid structures could be used in the field of molecular electronics, solar cells and in developing new sensors.

Porphyrins and graphene join to make a new material image

The technique involves growing a graphene layer on a surface of silver to use its catalytic properties. Then, under ultra-high vacuum conditions, porphyrin molecules are added. These lose the hydrogen atoms from their periphery when heated on the metal surface, and they end up connecting to the graphene edges.

Graphene-CNT junctions could be turned into excellent heat conductors

Jan 05, 2017

Researchers at Rice University have found that it may be possible to make graphene-carbon nanotube junctions excel at transferring heat, turning these into an attractive way to channel damaging heat away from next-generation nano-electronics. This could, in theory, be done by putting a cone-like “chimney” between the graphene and nanotube to eliminate the barrier that blocks heat from escaping.

Graphene-CNT junctions could be made to transfer heat image

Graphene and carbon nanotubes both excel at the rapid transfer of electricity and phonons, but when a nanotube grows from graphene, atoms facilitate the turn by forming heptagonal (seven-member) rings instead of the usual six-atom rings. Scientists have determined that forests of nanotubes grown from graphene are excellent for storing hydrogen for energy applications, but in electronics, the heptagons scatter phonons and hinder the escape of heat through the pillars.

Graphene solves RRAM's failure problems

Dec 01, 2016

Resistive RAM (RRAM) is a promising new next-generation memory technology that is being commercialized by several companies. Researchers at the Chinese Academy of Sciences have been study a device failure caused by two processes in cation-based RRAM, and have discovered that graphene may hold the key.

Graphene-enhanced cation-based RRAM (CaS)

If a single-layer graphene is added to the device, and used as an ion barrier between two metallic layers in the device, the RRAM cell is more reliable while still maintaining high performance.

Researchers suggest new route for graphene processing that could prove useful for graphene-based electronics

Oct 30, 2016

A group of scientists from the National Research University of Electronic Technology – MIET (Russia), Technological Center AIMEN (Spain) and Forschungszentrum Jülich (Germany) has developed an approach for graphene physical and chemical modification avoiding the step of resist deposition, that can be useful for graphene-based electronics technologies.

Graphene process for electronics image

This work demonstrates the mask-less and resist-free patterning of graphene by two different routes: thermal ablation or oxidative etching. That means that by varying the parameters of laser pulses, chemical tuning (energy gap control) and isolation line patterning is possible in a single process without any chemicals. The same group published the results of graphene oxide reduction by using thermal and chemical effects from laser irradiation. Moreover the laser pulses provide 3D embossing of graphene that open the way for single processing of NEMS and microfluidic-based sensors in graphene.

Russian team makes graphene with high stability under ozonation, with great potential for nanoelectronics

Oct 20, 2016

Scientists from Russia's National Research Nuclear University MEPhI have succeeded in producing graphene with a very high stability to ozonation using high-temperature sublimation of silicon carbide (SiC). The resulting graphene maintains contact with ozone for more than 10 minutes (while ordinary graphene loses its properties after only three or four minutes under such conditions). These results may hold great potential for the development of nanoelectronics.

To further examine the effects, scientists from Greece, France and Sweden were brought onto the team. Using computer modeling, the experts were able to figure out why SiC-graphene was more stable under the impact of aggressive oxygen free radicals. The new graphene's abnormal stability appeared to be associated with the low roughness of epitaxial graphene on SiC-substrate (epitaxy is a natural buildup of one crystalline material upon the surface of another).