Electronic properties of chemically modified surfaces and nanostructured materials

化学改性表面和纳米结构材料的电子特性

• 批准号: 312417-2012
• 负责人: Lopinski, Gregory
• 金额: $ 1.24万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=657958
• 关键词: Electronic; properties; chemically; modified; surfaces

The goal of this research program is the development of methods for tuning the electronic properties of surfaces and nanomaterials via chemical modification. Adsorption or covalent attachment of polar molecules at a surface can lead to large changes in the work function of the material. In addition, on semiconductor surfaces, these modifications can have long-range (10-1000nm) effects on the electronic properties due to the penetration of electric fields arising from surface charges which shift energy levels and influence the density of free carriers (a phenomena often called band-bending). These effects can be exploited for electrical detection of chemical and biochemical species as well as in the design of electronic devices such as transistors, photovoltaics, and light emitting diodes. In the proposed work we will continue to learn how chemical modification can be used to induce band bending and control electrical transport on silicon. Functionalization of the surface with organic functional groups of electron donating and withdrawing character will be used to systematically alter the conductivity and form surfaces that selectively respond to different molecular species. Learning how to control and exploit these effects should prove useful in chemical and biochemical detection as well as in the development of a new approach to the formation of nanoscale conducting channels. Studies on planar silicon will be extended to silicon nanowire networks and individual silicon nanowires. Sensitivity of nanowires to adsorption and reaction events will be compared with the planar substrates.**We will also investigate the chemical modification of graphene. Graphene has attracted considerable recent interest as a unique two-dimensional electronic material with potential applications in nanoelectronics, sensors and energy storage. Chemical modification of both continuous graphene films produced by graphitization of SiC and graphene nanoplatelets made by chemical exfoliation will be probed by scanning tunneling microscopy and other surface science techniques. Effects of physical adsorption and covalent chemical modification on electrical transport in graphene films will be investigated. ************

该研究计划的目标是开发通过化学改性调整表面和纳米材料电子特性的方法。极性分子在表面处的吸附或共价连接可导致材料的功函数的大的变化。此外，在半导体表面上，这些改性可以对电子性质产生长距离（10- 1000 nm）影响，这是由于表面电荷产生的电场的渗透，这些电场会改变能级并影响自由载流子的密度（一种通常称为能带弯曲的现象）。这些效应可用于化学和生物化学物质的电检测以及电子器件（如晶体管、光致发光器件和发光二极管）的设计。在拟议的工作中，我们将继续学习如何化学修饰可以用来诱导能带弯曲和控制硅上的电输运。 将使用具有给电子和吸电子特性的有机官能团对表面进行官能化，以系统地改变电导率并形成选择性地响应不同分子种类的表面。 学习如何控制和利用这些影响应该证明是有用的化学和生化检测，以及在一个新的方法来形成纳米导电通道的发展。对平面硅的研究将扩展到硅纳米线网络和单个硅纳米线。纳米线对吸附和反应事件的敏感性将与平面衬底进行比较。我们还将研究石墨烯的化学修饰。石墨烯作为一种独特的二维电子材料，在纳米电子学、传感器和能量存储方面具有潜在的应用前景，近年来引起了人们的极大兴趣。 将通过扫描隧道显微镜和其他表面科学技术来探测通过SiC的石墨化和通过化学剥离制成的石墨烯纳米片产生的连续石墨烯膜的化学改性。物理吸附和共价化学修饰对石墨烯薄膜电输运的影响将被研究。************