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News — Graphene

2D Materials Can Now be Controlled with Redox Reactions

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Researchers at the Pohang University of Science & Technology (POSTECH) Department of Chemistry have discovered that redox reactions can be used to control the properties of two-dimensional (2D) materials.  Redox reactions between water and oxygen molecules in the air drive an electrochemical reaction within 2D materials that dopes them with charges from the surrounding environment.  For this experiment, graphene and tungsten disulfide were analyzed, using Raman spectroscopy and photoluminescence imaging respectively, to demonstrate this phenomenon on the nanoscale.  Key material properties such as the magnetic, optical, and electrical nature of the materials were all controllable via redox manipulation.  Now that...

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5 Reasons Nanomaterials are the Future of Energy Storage

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An international conglomerate of scientists and researchers from Drexel, Stanford, Graphene Labs, the Center for Advancing Electronics Dresden (CFAED) and others have collaborated to develop a report that details how the future of energy storage technology lies in nanomaterials.  The chief benefits of nanomaterials can be summarized into five major categories: Lifetime – nanoparticles allow devices to achieve longer lifetimes due to their minimized contact area, which prevents strain induced degradation during battery cycling. Flexibility – nanowire (1D) and nanoflake (2D) materials are both compatible with flexible devices while simultaneously achieving high electronic and ionic conductivity. Manufacturing – the unique...

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What Governs Crystal Growth? Scientists Have Revealed a Fundamental Phenomenon

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Researchers at the University of Illinois at Chicago have used computer-based simulations to discover the general mechanism that governs crystal growth in materials – fluctuations in the solvent shield.  The solvent shield is a molecular shell comprised of solvent molecules that coalesce around a crystalline material when said material is immersed within a solvent.  Fluctuations in this shield allow molecules to break free and incorporate themselves into the crystal's surface in order to grow the overall structure, molecule by molecule.  The temperature, the solvent type, and the number of solvent molecules are all controllable variables that determine these shell fluctuations. ...

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A New Biosensor that Improves Stem Cell Therapy

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Researchers at Rutgers University have developed a new biosensor with high sensitivity and accuracy in order to reliably characterize the genetic material found within stem cells.  

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How to Quantify the Quality of Graphene? Scientists Have Provided an Answer

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Scientists at the U.S. Department of Energy’s Ames Laboratory have uncovered a previously unrecognized analytical characterization criterion that accurately quantifies the quality of 2D materials.  Specifically, they analyzed graphene using low energy electron diffraction.  Normally the diffraction results are expected to be sharp and clear peaks that represent the perfection of the material; however, the graphene results also included a broad diffusion band in addition to the aforementioned peaks.  While the cause for this broad diffusion band’s presence is not yet fully understood, the scientists at Ames Laboratory theorize that it is due to the confinement of graphene electrons into a...

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