H2020Индивидуална стипендия2015–2017

SCEL-TA · Surfactant controlled Cation Exchange Lithography - Towards Application

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

Период: 2015-09-01 → 2017-08-31
Финансиране от ЕС: 168 277 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Нов метод за създаване на електронни устройства чрез замяна на химични елементи в наночастици, например замяна на кадмий с мед за промяна на проводимостта им. Техниката помага за прецизното контролиране на физическите свойства на материалите в микроскопичен мащаб.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

Surfactant controlled Cation Exchange Lithography - Towards Application

The goal of the project was to develop a new method for the production of electronic devices based on nanoparticles. The technique relied on the process of cation exchange, in which the cations of nanocrystals can be exchanged to a different chemical element. In general, this leads to a drastic change of the physical properties of the nanocrystals. For instance, CdSe nanoparticles show a strong fluorescence and exhibit a low conductivity. Cu2Se nanoparticles that have been obtained by exchanging the Cd with Cu, show no fluorescence and an increased conductivity. The cation exchange, in general, is performed by providing a solution of cations to colloidal nanocrystals. When the conditions, e.g. temperature and the choice of cations and nanocrystals, are chosen correctly, the new cations diffuse towards and into the colloidal nanocrystals, where they replace the original cations, which then diffuse out of the nanocrystals. In the framework of this project we investigated on the limits of this process in terms of applicability to different systems of nanoparticles and on potential applications. To this aim, we relied on an extension of the cation exchange. When performed on dry films of nanocrystals, we could selectively suppress the cation exchange by irradiating sections of the film with an electron beam. The electrons, or their deposited energy, induced a cross-linking of the surfactant molecules, i.e. the organic molecules surrounding the nanocrystals. Subsequently the substrates were immersed into a solution of cations. The cross-linked molecules then hindered the diffusion of the cations towards the nanocrystals and therefore suppressed the cation exchange, whereas the neighbouring regions that have not been exposed to the electron beam did undergo the cation exchange. Ultimately, this lead to substrates cover with at film composed of two different materials. We performed this selective suppression of the cation exchange both on single nanocrystals and on continuous films of nanocrystals. Especially in the case of the continuous films we could demonstrate that this technique could be used for the production of a electronic devices.

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

Цел на проекта

A novel lithography technique, the Surfactant-controlled Cation Exchange Lithography (SCEL) will be explored. The underlying mechanism, the Cation Exchange (CE), stems from the colloidal synthesis of nanocrystals (NCs). It allows for the transformation of the chemical composition of readily prepared NCs by exchanging their cation sublattice without changing their morphology.The SCEL relies on the selective inhibition of the CE in NCs that have been exposed to a high-energy radiation, e.g. in an e-beam lithography step or by UV-light. It has been shown that the radiation induces a cross-linking of the surfactants, which then, when exposed to a solution of suitable cations, form an impermeable shell for the cations and thus inhibit the reaction. In the proposed SCEL the cation exchange will be carried out on thin films of NCs (mostly CdS or CdSe), which are then partially transformed into CuXS or CuXSe, respectively. We will investigate on the limits of the SCEL as a competitive lithography method in terms for the production of devices with colloidal nanocrystals as functional elements. Ideally, we will be able to controllably address a small number of NCs by transforming their neighbours into conductive material. The research comprises a study on the mechanism of inhibition of the cation exchange after irradiation and a study on the dynamics of the CE in individual nanocrystals.

Оригинален текст от CORDIS (на английски).

Участници

FONDAZIONE ISTITUTO ITALIANO DI TECNOLOGIA · GenovaКоординаторИталия