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Showing Spotlights 73 - 80 of 174 in category Graphene and Other 2D Materials (newest first):


Graphene nanomotor mimics internal combustion engine

graphene_nanomotorMost nanomotors designs are powered by quantum or, in most cases, catalytic chemical processes, the nanoscale equivalent of conventional internal heat engines that are so prevalent in our daily life has been missing. Researchers have now suggested a new type of ultrathin graphene engine which mimics an internal combustion engine system. This graphene engine consists of only a few parts - functionalized graphene, laser light, and substrate, which would make it simple to work with.

Posted: May 16th, 2014

Graphene-based optical sensor detects single cancer cells

flow_sensing_systemThe nanotechnology-enabled detection of a change in individual cells, for instance cell surface charge, presents a new alternative and complementary method for disease detection and diagnosis. Since diseased cells, such as cancer cells, frequently carry information that distinguishes them from normal cells, accurate probing of these cells is critical for early detection of a disease. For this purpose, researchers have now designed a graphene-based optical refractive index sensor.

Posted: May 15th, 2014

Transistor made from all two-dimensional materials

2D_materialsMuch hope (and hype) rides on graphene as a 'post-silicon' material for fabricating next-generation nanoelectronic devices. However, graphene's Achilles heel is its lack of an energy band gap. Therefore, graphene must be modified to produce a band gap, if it is to be used in electronic devices. Using a new approach, researchers now have demonstrated the operation of an all two-dimensional transistor, using a transition metal dichalcogenides channel material, hexagonal boron nitride gate dielectric, and graphene source/drain and gate contacts.

Posted: May 13th, 2014

New method to evaluate the exfoliation and fragmentation results of 2D materials

graphene_flakeThe way graphene sheets are produced in solution, by exfoliation, is an original process, still not completely understood. The exfoliation of a 2D object from a 3D bulk material is a process spanning from the nano- to meso-scale due to bubble cavitation, intercalation and disruptive fragmentation. When characterizing these 2D sheet solutions, their average size and size standard deviation are commonly reported, often assuming that their size follows a 'normal' distribution. Experimental data shows that this is not the case.

Posted: May 8th, 2014

Wearable graphene strain sensors monitor human vital signs

graphene_sensorGraphene's piezoresistive effect, combined with its other properties such as ultra-translucency, superior mechanical flexibility and stability, high restorability, and carrier mobility, enables the use of graphene in high-sensitivity strain sensors. Potential application areas for these sensors could be found in flexible display technology, robotics, smart clothing, electronic skin, in vitro diagnostics, implantable devices, and human physiological motion detection - which has been considered as an effective approach to evaluate human health. To demonstrate this application, researchers have now reported on a method to monitor human motions.

Posted: Apr 30th, 2014

New synthesis method for graphene using agricultural waste

grapheneResearchers have proposed an alternative way of making graphene from rice husk. This research, using an ordinary synthetic apparatus and abundant agricultural waste, suggest that low cost graphene materials could now be easily and cheaply synthesized on an industrial scale. Due to its abundance, risk husk has already received much attention as a starting material in generating high-value-added materials such as silica and porous carbon.

Posted: Apr 7th, 2014

Nanotechnology water remediation with bulky graphene materials

water_dropIndividual graphene sheets and their functionalized derivatives have been used to remove metal ions and organic pollutants from water. These graphene-based nanomaterials show quite high adsorption performance as adsorbents. However they also cause additional cost because the removal of these adsorbent materials after usage is difficult and there is the risk of secondary environmental pollution unless the nanomaterials are collected completely after usage. One solution to this problem would be the assembly of individual sheets into three-dimensional (3D) macroscopic structures which would preserve the unique properties of individual graphene sheets, and offer easy collecting and recycling after water remediation.

Posted: Mar 26th, 2014

Spit on it - Micro fuel cell powered by saliva

micro_fuel_cellBy miniaturizing microbial fuel cells, it becomes possible to build miniature energy harvesters that could power lab-on-chip or point-of-care diagnostics devices independent of any external power source. Because micro-sized microbial fuel cells utilize less electrode area and less liquid fuel volume than their macro-sized counterparts, optimizing the electrodes and the fuel sources are the most important factors in designing a micro-sized MFC for maximum power production.

Posted: Mar 24th, 2014