Nanotechnology Spotlight – Latest Articles

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Showing Spotlights 1 - 8 of 265 in category Graphene and Other 2D Materials (newest first):

 

van der Waals heterostructures harness ionic power from photo-induced ion transport

heterostructuresIn general, there are three types of driving force for ion transport: electric field; mechanical pressure; and concentration gradient. Recently, light has been propsoed as a fourth. Now, researchers report the incorporation of a transition metal dichalcogenides based van der Waals multilayer heterostructure into nanofluidic materials, and demonstrate a new photo-induced active ion transport phenomenon. This will inspire a broad range of fundamental research and practical application for light-controlled ionic circuits, artificial photosynthesis, biomimetic energy conversion, and so on.

Mar 4th, 2021

High-performance carbon composites made from stretch-bridged graphene sheets

graphene-sheetsIn order to exploit the remarkable mechanical properties of graphene for practical applications, nanoscale graphene sheets need to be assembled into much larger, macroscopic structures. However, there are two pivotal issues that make this task challenging: One is the inherently misaligned and wrinkled structure of graphene platelets; another is the weak interfacial interaction among graphene platelets. Both these problems greatly degrade the properties of macroscopic graphene assemblies such as sheets and fibers.

Feb 10th, 2021

MBenes - boron-analogues of MXenes - enable efficient electrochemical synthesis of ammonia

MBeneThe industrial production of ammonia mostly relies on the energy-intensive Haber-Bosch process, which causes significant environmental pollution. Researchers have now proposed that a class of 2D transition metal borides termed MBenes - the boron-analogues of MXenes - could be used as catalyst for ammonia production through electrochemical nitrogen reduction reaction (NRR). This work also provides a general design principle for further exploration of an even broader composition space of MBenes and other 2D NRR electrocatalysts.

Nov 17th, 2020

Graphene-based nanomaterials for the next generation cancer theranostics

cancer-nanotechnologyThe use of graphene-based materials in pharmaceutical nanotechnology has recently received more attention due to their unique chemical structure and physicochemical properties - including an ultra-high surface area, optical, thermal and electrical conductivities, and a good biocompatibility. They can also load large amounts of drug molecules on both sides of the single atom layer sheet. The next generation of cancer nanotheranostics employing graphene-based nanomaterials could address the many challenges associated with traditional chemotherapeutic agents, such as the issues surrounding poor solubility, harmful side effects, non-specific drug distribution, and multi-drug resistance.

Oct 9th, 2020

Growing large-area single-grain graphene layers

graphene-flakesResearchers demonstrate that single-grain growth of graphene crystals can be achieved over a large, macroscale, area. Specifically, the team shows that graphene flakes, nucleated over a polycrystalline graphene film, synchronize during growth so as to ultimately yield a common crystal orientation at the macroscale. The phenomenon of self-alignment of graphene grains during their growth, which the team discovered experimentally, has never been observed before - and at this time the scientists don't have a good model for the underlying physics which leads to this effect.

Sep 30th, 2020

Electromagnetic interference shielding with graphene composites for 5G-and-beyond communication technologies

graphene-EMI-shieldingAny working electronic device is the source of electromagnetic (EM) radiation. Device miniaturization and a consequent increase in the heat and electromagnetic (EM) wave emission in the electronic systems make the simultaneous heat management and electromagnetic interference (EMI) shielding crucially important. New research shows that the extremely high thermal conductivity of graphene and good electrical conductivity, even without the energy band-gap, make graphene promising for EMI shielding and thermal management applications.

Sep 28th, 2020

Topological quantum phase in 2D MoTe2 induced by light

energy-surfaceResearchers have provided an example of on-demand control of quantum phenomena to design the quantum materials. By state-of-the-art quantum mechanical simulations, they find that a two-dimensional transition-metal ditelluride, MoTe2, can realize a structural phase transition from the semiconducting phase to the topological phase triggered by photoexcitation of carriers alone. The sub-picosecond phase transition can be controlled by varying the laser wavelength. The research is inspired by the classical phase transition theory proposed by Lev Davidovich Landau and Rudolf Ernst Peierls.

Sep 14th, 2020

Buckled graphene provides an alternative for strongly correlated phenomena in graphene

graphene-bucklesPeriodically strained graphene harbors correlated electronic phases similar to those previously observed in magic angle twisted bilayer graphene. By precisely rotating two stacked sheets of graphene one can induce superconducting and insulating phases depending on the electric density. This behavior is extremely desirable because it significantly reduces energy losses in electronic devices making them more efficient and durable. Researchers have now proposed an alternative way to obtain similar phases. Their approach relies on periodically straining a graphene sheet rather than stacking layers on top of each other.

Aug 13th, 2020