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We investigate phase imaging of supported graphene using amplitude modulation atomic force microscopy (AFM), so called, tapping mode. The phase contrast between graphene and neighbouring substrate grows at hard tapping conditions and the contrast is enhanced compared to the topographic one. Therefore, the phase measurements could enable a high contrast imaging of graphene and related two dimensional materials and heterostructures, not achievable with conventional AFM based topographic measurements. Obtained phase maps are then transformed into energy dissipation maps which are important for graphene applications in various mechanical systems. From fundamental point of view, the energy dissipation gives further insights into mechanical properties. Reliable measurements, obtained in the repulsive regime, show that the energy dissipation on graphene covered substrate is lower than on bare one, so graphene provides a certain shielding in tip-substrate interaction. According to obtained phase curves and their derivatives, as well as according to correlation measurements based on AFM nanoindentation and force modulation microscopy, we conclude that the main dissipation channels in graphene-substrate systems are short range hysteresis and long range interfacial forces.
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Graphene on noble-metal nanostructures constitutes an attractive nanocomposite with possible applications in sensors or energy conversion. In this work we study the properties of hybrid graphene/gold ...
Graphene is considered as a promising candidate material to replace silicon for the next generation nanoelectronics due to its superb carrier mobility. To evaluate its thermal dissipation capability a...
X-ray phase-contrast imaging can substantially enhance image contrast for weakly absorbing samples. The fabrication of dedicated optics remains a major barrier, especially in high-energy regions (i.e....
We present a technique to precisely measure the surface energies between two dimensional materials and substrates that is simple to implement and allows exploration of spatial and chemical control of ...
Topographic studies using scanning probes have found that graphene surfaces are often covered by micron-scale domains of periodic stripes with a 4 nm pitch. These stripes have been variously interpret...
The purpose of this study is to test the effectiveness of USES, a strengths-based enhancement to supported employment (SE), as compared to supported employment alone.
The whole body calorimeter is sensitive enough to reliably measure cold-induced thermogenesis as a surrogate marker of brown adipose tissue (BAT) activation. The infrared (IR) energy flux...
The purpose of this study is to better understand how participation in cost-subsidized community supported agriculture programs paired with tailored education can affect diet quality and e...
This study will examine the role of temperature in changing energy metabolism in human muscle. In order to do this, researchers will use magnetic resonance imaging (MRI) to provide inform...
Clinical study to evaluate diagnostic accuracy of low dose contrast enhanced dual energy mammography imaging (CEDEM+PRIME) in comparison with CE-MRI The primary objective of this clinical ...
Rate of energy dissipation along the path of charged particles. In radiobiology and health physics, exposure is measured in kiloelectron volts per micrometer of tissue (keV/micrometer T).
Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.
The use of molecularly targeted imaging probes to localize and/or monitor biochemical and cellular processes via various imaging modalities that include RADIONUCLIDE IMAGING; ULTRASONOGRAPHY; MAGNETIC RESONANCE IMAGING; fluorescence imaging; and MICROSCOPY.
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
The interval between two successive CELL DIVISIONS during which the CHROMOSOMES are not individually distinguishable. It is composed of the G phases (G1 PHASE; G0 PHASE; G2 PHASE) and S PHASE (when DNA replication occurs).