Ion tracks as electrically conducting nanowires

作为导电纳米线的离子轨迹

• 批准号: 206649505
• 负责人: Professor Dr. Hans Christian Hofsäss
• 金额: --
• 依托单位: II. Physikalisches Institut - Atom- und Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/206649505?language=en
• 关键词: Ion; tracks; electrically; conducting; nanowires

Ion tracks in matter are generated during irradiation with swift heavy ions by high and very local electronic energy loss. The structural changes induced in this way often yield to amorphous tracks or defect enriched latent tracks. In very few cases one finds a local phase transformation form an electrically insulating to a conductive phase. This is the case for tetrahedral amorphous carbon (ta-C) which locally converts to a sp2 bonded conductive phase upon irradiation with e.g. GeV 238U ions. The diameter of the conducting tracks is only 8 nm. Thus, conducting ion tracks possess the potential to realize novel nanoscale electronic devices. It seems that beside ta-C other materials like VO2 , rare earth nickelates and Fe3O4, which undergo an insulator-metal transition as function of temperature, are also suited to generate conducting ion tracks. Such systems may be of interest for all-oxide electronic devices and because of their thermoelectric behaviour. The aim of the proposal is to tailor the track conductivity in ta-C towards high and uniform conductivity with Ohmic conduction. This shall be achieved by doping of the ta-C matrix with suited metal atoms and also by ion irradiation with high charge state ions (high energy loss). Furthermore, the formation, the microstructure and the properties of conducting ion tracks in VO2 thin films shall be investigated. The potential of ion track electronics shall be studied for interrupted tracks, prepared by irradiating layered film structures of ta-C and insulating BN spacer layers. In this way conducting ion tracks provide the contacts to a small volume of few nm3 in size which may exhibit Coulomb blockade effects even at room temperature.

物质中的离子径迹是在快速重离子辐照过程中通过高和非常局部的电子能量损失而产生的。以这种方式引起的结构变化通常会导致无定形磁道或缺陷丰富的潜在磁道。在极少数情况下，人们发现从电绝缘相到导电相的局部相变。这就是四面体无定形碳(ta-C)的情况，当受到例如GeV 238U离子的照射时，它局部转化为sp2键合的导电相。导电轨道的直径只有8 nm。因此，导电离子径迹具有实现新型纳米电子器件的潜力。看来，除了Ta-C以外，其他材料如VO2、稀土镍酸盐和Fe3O4也适合产生导电离子径迹，这些材料随着温度的变化发生绝缘体-金属的转变。这类系统可能会对全氧化物电子设备感兴趣，因为它们具有热电行为。该建议的目的是将ta-C轨道的导电性调整为具有欧姆导电性的高而均匀的导电性。这将通过用合适的金属原子掺杂Ta-C基质以及用高电荷态离子(高能量损失)进行离子辐照来实现。此外，还将对VO2薄膜中导电离子径迹的形成、微观结构和性质进行研究。离子径迹电子学的电势应研究间断径迹，这种径迹是通过照射Ta-C的层状薄膜结构和绝缘BN隔离层而制备的。通过这种方式，导电离子径迹将接触提供给几个立方米大小的小体积，即使在室温下也可能显示库仑阻塞效应。

项目成果

Nano-hillock formation in diamond-like carbon induced by swift heavy projectiles in the electronic stopping regime: Experiments and atomistic simulations

• DOI: 10.1063/1.4752455
• 发表时间: 2012-09
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: D. Schwen;E. Bringa;J. Krauser;A. Weidinger;C. Trautmann;H. Hofsäss

Conducting ion tracks generated by charge-selected swift heavy ions

由电荷选择的快重离子产生的导电离子轨迹

• DOI: 10.1016/j.nimb.2016.05.010
• 发表时间: 2016
• 期刊: Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
• 影响因子: 1.3
• 作者: Gehrke;Krauser;Trautmann;Severin;Bender;Rothard;Hofsäss
• 通讯作者: Hofsäss

Conductive tracks of 30-MeV C60 clusters in doped and undoped tetrahedral amorphous carbon

掺杂和未掺杂四面体非晶碳中 30-MeV C60 团簇的导电轨迹

• DOI: 10.1016/j.nimb.2012.12.081
• 发表时间: 2013
• 期刊: Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
• 影响因子: 1.3
• 作者: Krauser;Gehrke;Hofsäss;Trautmann;Weidinger
• 通讯作者: Weidinger

Analysis of Immittance Spectra: Finding Unambiguous Electrical Equivalent Circuits to Represent the Underlying Physics

导抗谱分析：寻找明确的电气等效电路来表示基础物理

• DOI: 10.1103/physrevapplied.4.044007
• 发表时间: 2015
• 期刊: Physical review applied
• 影响因子: 4.6
• 作者: J. A. Amani;T. Koppe;H. Hofsäss;U. Vetter
• 通讯作者: U. Vetter

Conductivity enhancement of ion tracks in tetrahedral amorphous carbon by doping with N, B, Cu and Fe

N、B、Cu 和 Fe 掺杂增强四面体非晶碳中离子径迹的电导率

• DOI: 10.1016/j.nimb.2011.01.083
• 发表时间: 2012
• 期刊: Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
• 影响因子: 1.3
• 作者: Krauser;Gehrke;Hofsäss;Trautmann;Weidinger
• 通讯作者: Weidinger