Correlation of growth, structure, optical and electronic properties of novel Nb3O7(OH) and Nb2O5 nanostructures

新型 Nb3O7(OH) 和 Nb2O5 纳米结构的生长、结构、光学和电子特性的相关性

• 批准号: 289657667
• 负责人: Professorin Dr. Christina Scheu
• 金额: --
• 依托单位: Max-Planck-Institut für Eisenforschung GmbH (MPIE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/289657667?language=en
• 关键词: Correlation; growth; structure; optical; electronic

One-dimensional single crystalline nanostructured metal oxide electrodes have the advantage of creating efficient pathways for charge carriers. However, defects occurring in these structures and different crystallographic modifications affect their performance in applications such as hybrid and dye-sensitized solar cells, batteries or (photo-)catalysis. This project will focus on novel Nb3O7(OH) and Nb2O5 nanostructures and compare them with the well-established TiO2. The niobium oxide systems have rarely been elaborated, even though they have a high potential for applications. Next to a detailed analysis, special focus will be put on the controlled growth and the influence of the growth conditions on the characteristics of the niobium oxide systems. For the metal oxide nanostructures it will be essential to understand and control the charge carrier mobility in order to allow tailored application in devices. In this regard, this project focusses on the analysis of the effects of grain boundaries and the crystallinity on charge transport and recombination as these processes caused by structural defects might dominate the optical and electronic properties. By varying the growth conditions, better understanding of the mechanisms leading to such defects will allow to control and limit the formation of defects as it has been shown previously by us for TiO2. The combination of high-resolution transmission microscopy studies and optical and electronic characterization methods enables us to obtain a fundamental understanding of the physical phenomena of crystal growth, structure, charge transport, etc. and the correlation between these properties.

一维单晶纳米结构金属氧化物电极具有为电荷载流子创造有效路径的优点。然而，这些结构中出现的缺陷和不同的晶体修饰会影响它们在混合和染料敏化太阳能电池、电池或（光）催化等应用中的性能。该项目将重点研究新型 Nb3O7(OH) 和 Nb2O5 纳米结构，并将它们与成熟的 TiO2 进行比较。尽管氧化铌系统具有很高的应用潜力，但它们很少被详细阐述。接下来进行详细分析，将特别关注控制生长以及生长条件对氧化铌系统特性的影响。对于金属氧化物纳米结构，了解和控制载流子迁移率至关重要，以便在设备中进行定制应用。在这方面，该项目重点分析晶界和结晶度对电荷传输和复合的影响，因为这些由结构缺陷引起的过程可能会主导光学和电子性能。通过改变生长条件，更好地了解导致此类缺陷的机制将有助于控制和限制缺陷的形成，正如我们之前针对 TiO2 所展示的那样。高分辨率透射显微镜研究与光学和电子表征方法的结合使我们能够对晶体生长、结构、电荷传输等物理现象以及这些性质之间的相关性有一个基本的了解。

项目成果

TiO2 Nanowire Array Memristive Devices Emulating Functionalities of Biological Synapses

• DOI: 10.1002/aelm.202000950
• 发表时间: 2021-01
• 期刊: Advanced Electronic Materials
• 影响因子: 6.2
• 作者: C. Ebenhoch;L. Schmidt‐Mende

Controlling the density of hydrothermally grown rutile TiO2 nanorods on anatase TiO2 films

• DOI: 10.1016/j.surfin.2019.02.010
• 发表时间: 2019-06
• 期刊: Surfaces and Interfaces
• 影响因子: 6.2
• 作者: J. Kalb;Alena Folger;Eugen Zimmermann;Melanie Gerigk;B. Trepka;C. Scheu;S. Polarz;L. Schmidt‐Mende

Complementary switching in single Nb3O7(OH) nanowires

单根 Nb3O7(OH) 纳米线的互补开关

• DOI: 10.1063/5.0052589
• 发表时间: 2021
• 期刊: APL Materials
• 影响因子: 6.1
• 作者: C. Ebenhoch;T. Gänsler;S. Schupp;C. Scheu;L. Schmidt-Mende
• 通讯作者: L. Schmidt-Mende

Atomic Resolution Observation of the Oxidation of Niobium Oxide Nanowires: Implications for Renewable Energy Applications

• DOI: 10.1021/acsanm.0c01952
• 发表时间: 2020-09
• 作者: S. Betzler;A. Koh;B. Lotsch;R. Sinclair;C. Scheu