Thursday, December 27, 2012

Cutting graphene using atomic force microscope

In a recent study, atomic force microscope is used to cut the graphene. Cutting forces are also measured with higher single cutting force along armchair direction than zig-zag.

Growth of monolayer Yttria on Graphene !

Researchers have successfully deposited a monolayer of Yttria- a high k dielectric- on graphene under high vacuum conditions. This provides a significant leap for integrating graphene in device architectures.

Sunday, December 23, 2012

Electron energy loss spectroscopy helps in probing single Si atom dopant in graphene

A combination of scanning electron micsroscope (SEM), electron energy loss spectroscopy (EELS) and ab-initio calculations reveal the bonding and electronic structure of single Si atom dopant in graphene.

Tuesday, December 18, 2012

Graphene floats on SiC !

Epitaxial graphene grown on SiC has excellent quality in terms of mobility and is a candidate for microelectronics industry. However, graphene's interaction with SiC disturbs most of the properties. In a recent ACS Nano report, researchers have used oxygen as an intercalant to lift graphene from SiC and opens up ways for  further applications.

Thursday, December 13, 2012

Trilayer graphene as a versatile platform for electron optics and pseudospintronics

Not only single layer graphene rather multilayer graphene has also great promises for nanotechnology. In recent experiments, trilayer graphene is demonstrated as a potential candidate for pseudospintronics and electron optics.

micro-wave induced electrical response leads to spin resonance in epitaxial graphene

Graphene is strongly known for its exotic electronic properties. However, spin properties of graphene are also vitally important for new spintronics based devices. A recent report published in Nature reveals hole spin resonance and zero-field psuedo splitting in epitaxial graphene photoexcited by microwaves.

Thursday, December 6, 2012

Hybridized gold with graphene induces giant Rashba splitting

One of the major focus areas in graphene research is the spintronic applications of graphene. However, this depends on an efficient induction of spin-orbit coupling in graphene

Now, it is demonstrated using angle resolved photo-emission spectroscopy that hybridization between gold (a special configuration) and graphene can lead to enhanced spin-orbit splitting of the order of 100 meV

Photocurrent measurements of supercollision cooling in graphene

Optoelectronic and plasmonic applications of graphene relies on cooling of hot electrons generated after interaction with light. A group of reserachers have studied the nature of this cooling using graphene as a thermometer and explains the findings by invoking supercollision mechanism found recently in graphene.

Undoped graphene helps in detection of supercollision cooling !

The flexibility of changing the Fermi energy level of graphene by a voltage has proven to be a blessing in many applications. Especially  optoelectronics and photonic application of graphene have emerged. 
A new finding reveals the detection of supercollision, i.e. collision of charge carriers with both phonons and impurities, in graphene. The study proves to be useful for bolometric and photo-detection applications of graphene.

Monday, December 3, 2012

Graphene-CNT hybrid for energy storage

A recent work at Rice University has demonstrated the synthesis of graphene-CNT hybrid material. A surface area of as high as >2,000 m2 g−1  has been achieved with an ohmic contact between graphene and CNTs.

Saturday, December 1, 2012

Graphene- recoverable structure under high stresses

Recent high pressure experiments on few layer graphene have demonstrated that graphene possesses most healable structure under high stresses.