H2020Индивидуална стипендия2021–2023

vdWForcesIn2D · Experimental and theoretical determination of van der Waals forces between and within two-dimensional materials

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2021-08-01 → 2023-07-31
Финансиране от ЕС: 178 320 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Ван дер Ваалсовите сили между двуизмерни материали, като графена, се изследват чрез нови методи за измерване на силите при наноразмери. Това помага да се разберат квантовите ефекти и как те влияят върху създаването на електронни, магнитни и оптични устройства.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Experimental and theoretical determination of van der Waals forces between and within two-dimensional materials

Van der Waals (vdW) forces play a crucial role in matter, for example, they drive the formation of two-dimensional multilayered functional devices with novel electronic, magnetic, and optical properties. Noncovalent vdW forces are well understood when interactions involve small molecules or macroscopic bodies. The situation is much less obvious when at least one of the interacting objects has nanoscale size. In this project, we developed a novel force microscopy setup which allowed a direct experimental confirmation of strongly nonadditive van der Waals forces from graphenic nanostacks (and other 2D materials). Surprisingly, we observed nonadditivity of van der Waals interactions with a macroscopic tip at macroscopic (> 1 micrometer) separations from a nanostructured surface. This sets a new record in terms of force measurements and clearly demonstrates the importance of quantum-size effects in macroscopic systems. The overall objectives of the project were: • (O1) Deliver measurements of vdW forces in 2D samples. Present a clarification of interaction ranges, thickness-dependent scaling laws, comparison between samples, and between nano- and macro- measurements. • (O2) Deliver experimental data on the binding energies between 2D materials. • (O3) Plan theoretical models explaining scaling laws of vdW interaction at the nano- and macro-scale, and show their application for samples with different numbers, types, and quality of 2D materials.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Two-dimensional (2D) materials have a rich structural diversity and therefore are of high interest for applications in material science, chemistry, and biology. Many applications rely on interfacial stacking of 2D materials, hence understanding interactions between and within 2D materials are of paramount importance. During this fellowship, we will develop a strategy enabling rapid and high-throughput measurements of van der Waals (vdW) forces between 2D materials and their binding energies with each other by using atomic force microscopy. In contrast to existing experimental techniques, we will conduct experiments in the multilayered thin films having various numbers of 2D sheets with metallic, semiconducting, and insulating electronic properties. For this, we will use a tipless cantilever for the long-range macroscopic vdW force measurements between large areas of surface in a fast and reliable way. Next, vdW force measurements within 2D materials will be realized with the help of a new hollow probe. This new construct will allow using freestanding 2D materials for making direct contact with a surface and measurement of binding energy in the format of adhesion energy. Since the binding energy experiments are more complex as highly affected by surface roughness, we believe that this new implementation will help to uncover those properties much accurately. In summary, our experiments will provide much needed experimental benchmarks for the development of theoretical vdW methodologies, analysis of which is proposed in the final work package, while allowing the researcher to reintegrate the European research community after a fruitful post-doc abroad.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSITE DU LUXEMBOURG · ESCH-SUR-ALZETTEКоординаторЛюксембург