비만아 부모의 돌봄 경험: q 방법론

Probing surface and interface morphology with Grazing Incidence Small Angle X-Ray Scattering

http://nano-bio.ehu.es/files/articles/Ayala_C_2010_477.pdf

The doping of carbon nanotubes with nitrogen and their potential applications

Emerging trends in spin crossover (SCO) based functional materials and devices

Sodium-ion batteries (SIBs) have attracted increasing attention in the past decades, because of high overall abundance of precursors, their even geographical distribution, and low cost. Apart from inherent thermodynamic disadvantages, SIBs have to overcome multiple kinetic problems, such as fast capacity decay, low rate capacities and low Coulombic efficiencies. A special case is sodium super ion conductor (NASICON)-based electrode materials as they exhibit - besides pronounced structural stability - exceptionally high ion conductivity, rendering them most promising for sodium storage. Owing to the limiting, comparatively low electronic conductivity, nano-structuring is a prerequisite for achieving satisfactory rate-capability. In this review, we analyze advantages and disadvantages of NASICON-type electrode materials and highlight electrode structure design principles for obtaining the desired electrochemical performance. Moreover, we give an overview of recent approaches to enhance electrical conductivity and structural stability of cathode and anode materials based on NASICON structure. We believe that this review provides a pertinent insight into relevant design principles and inspires further research in this respect.

Challenges and Perspectives for NASICON-Type Electrode Materials for Advanced Sodium-Ion Batteries

Comportement électrochimique des faces vicinales de Au(111) ; surfaces à marches {111}

Graphene-based sensors are among the most promising of graphene’s applications. The ability to signal the presence of molecular species adsorbed on this atomically thin substrate has been explored from electric measurements to light scattering. Here we show that the adsorbed molecules can be used to sense graphene properties. The interaction of porphyrin molecules with nitrogen-doped graphene has been investigated using scanning tunneling microscopy and ab initio calculations. Molecular manipulation was used to reveal the surface below the adsorbed molecules allowing to achieve an atomic-scale measure of the interaction of molecules with doped graphene. The adsorbate’s frontier electronic states are downshifted in energy as the molecule approaches the doping site, with largest effect when the molecule sits over the nitrogen dopant. Theoretical calculations showed that, due to graphene’s high polarizability, the adsorption of porphyrin induces a charge rearrangement on the substrate similar to the image charges on a metal. This charge polarization is enhanced around nitrogen site, leading to an increased interaction of molecules with their image charges on graphene. Consequently, the molecular states are stabilized and shift to lower energies. These findings reveal the local variation of polarizability induced by nitrogen dopant opening new routes towards the electronic tuning of graphene.

/pdf/molecular-adsorbates-as-probes-of-the-local-properties-of-2rbqj2319s.pdf

Molecular adsorbates as probes of the local properties of doped

/pdf/black-phosphorus-for-directed-molecular-assembly-with-weak-3qb99yqum6.pdf

Black Phosphorus for Directed Molecular Assembly with Weak Electronic Coupling

Electron-electron interactions and excitons in carbon nanotubes are locally measured by combining Scanning tunneling spectroscopy and optical absorption in bundles of nanotubes. The largest gap deduced from measurements at the top of the bundle is found to be related to the intrinsic quasi-particle gap. From the difference with optical transitions, we deduced exciton binding energies of 0.4 eV for the gap and 0.7 eV for the second Van Hove singularity. This provides the first experimental evidence of substrate-induced gap renormalization on SWNTs.

https://hal.archives-ouvertes.fr/hal-00401007/document

Vincent Repain

Papers

Comportement électrochimique des faces vicinales de Au(111) ; surfaces à marches {111}

Molecular adsorbates as probes of the local properties of doped

Black Phosphorus for Directed Molecular Assembly with Weak Electronic Coupling

Measuring many-body effects in carbon nanotubes with a scanning tunneling microscope

Magnetic Anisotropy and Magnetization Reversal in Self-Organized Two-Dimensional Nanomagnets