Molecules in 2D h-BN

2D h-BN 中的分子

• 批准号: 2102643
• 负责人: Michael Arnold
• 金额: $ 23万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2102643&HistoricalAwards=false
• 关键词: Molecules; 2D; BN

NON-TECHNICAL SUMMARY With this project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, Professor Michael Arnold and his research group at the University of Wisconsin will investigate the creation of ultrathin, sheet-like materials that are only one atom thick. The materials will be created from an electrical insulator, containing the elements boron and nitrogen. Embedded and bonded within the sheets will be ultrasmall islands of carbon atoms. These islands will be as small as molecules, and, like normal molecules, these islands will have an exactly defined number of atoms and precisely defined shapes. The carbon islands will also mimic the electrical and optical properties of normal molecules but be seamlessly integrated and lie flat within the boron-nitrogen sheets. Materials like these, with this precision, have never been created previously. This project will address the challenge of synthesizing these materials and develop the fundamental understanding needed to create them. Atomically well-defined structures like these have the potential to be employed as next-generation filter-like materials with record-efficiency because of the materialsˈ extreme thinness and thus promise to impact applications of societal importance pertaining to the purification of air and water. The resulting materials moreover promise to possess properties needed for next-generation electronics and quantum electronics technologies, important for national defense and prosperity. The impact of the supported research and science, and of research and science in general, will be communicated to the public by the researchers through planned outreach activities, for example via the University of Wisconsin’s Badger Talks initiative. TECHNICAL SUMMARY Molecules are the ultimate nanostructures. Their size, shape, and composition can be nearly infinitely tuned, and exact replicas can be created on a massively parallel scale. Moleculesˈ physical, electrical, and optical properties can be vastly tailored – to realize insulating, semiconducting, and metallic behaviors and manipulate photons from the ultraviolet to the infrared. In this project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, we will create and explore analogs to molecules – specifically analogs to polycyclic aromatic hydrocarbon (PAH) molecules – that are not free but covalently embedded, in-plane, in crystalline monolayer sheets of insulating hexagonal boron nitride (h-BN). While nanoscale domains of carbon have been fabricated from the top-down in h-BN previously, these domains have been relatively large and/or disordered in shape and size, and none have been defined with molecular precision. Here, atomically precise carbon domains will be realized, from the bottom-up, by using PAH molecules themselves to create them. The embedded PAHs will offer the exactness and tunablility of conventional molecules but in a planar, immobilized, and atomically thin form. Molecularly embedded h-BN sheets promise phenomena not previously possible – including exceptionally thin materials with exact pores of widely tunable size and shape (through selective carbon etching) for molecular sequencing or sieving applications, h-BN sheets (conventionally insulating) with functional semiconducting dopants, and immobilized single molecules that are individually addressable.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目的非技术摘要，在材料研究部的固态和材料化学计划的支持下，威斯康星大学的迈克尔·阿诺德教授及其研究小组将调查创建仅是一种原子厚的超薄材料，类似薄片的材料。这些材料将是由含有硼和氮元件的电绝缘体创建的。这些岛屿内嵌入并粘合在床单中，将是碳原子的超大岛。这些岛屿将与分子一样小，并且像普通分子一样，这些岛屿将具有精确定义的原子和精确定义的形状。碳岛还将模仿正常分子的电气和光学特性，但无缝整合并平坦地位于硼氮片内。这样的材料以这种精度从未创建过。该项目将应对综合这些材料的挑战，并发展创建它们所需的基本理解。由于材料极度薄度，因此原子上定义明确的结构具有以创效率的下一代滤光片材料的潜力，因此有望影响与空气和水的纯化有关的社会重要性的应用。此外，由此产生的材料承诺对下一代电子和量子电子技术所需的潜在特性，这对于国防和繁荣至关重要。研究人员将通过计划的外展活动向公众传达支持的研究和科学以及一般研究与科学的影响，例如，通过威斯康星大学的Badger Talks Initiative。技术摘要分子是最终的纳米结构。它们的大小，形状和成分几乎可以无限地调节，并且可以以大量平行的比例创建精确的副本。分子可以量身定制的物理，电气和光学特性 - 实现绝缘，半导体和金属行为，并从紫外线到红外线操纵照片。在该项目中，在材料研究划分的固态和材料化学计划的支持下，我们将创建和探索类似于分子的类似物 - 特别是对多环芳族烃（PAH）分子的类似物，这些分子不是免费的，但在晶体层中，无透明的单层毛毛毛。虽然先前在H-BN的自上而上制造了碳的纳米级结构域，但这些结构域的形状和大小相对较大和/或无序，没有分子精度来定义。在这里，通过使用PAH分子本身来创建原子上精确的碳域。嵌入的PAHS将提供常规分子的精确性和可调节性，但在平面，固定和原子上薄的形式。分子嵌入的H-BN表可以承诺以前无法实现现象 - 包括具有广泛可调的尺寸和形状的精确孔（通过选择性碳蚀刻），用于分子测序或筛分应用，H-BN表（常规上绝缘）具有功能性的半导体和不合时宜的单分解剂，并且是分子的单独构成，这些型号和不可或缺的型物质是构成的。使用基金会的知识分子优点和更广泛的影响审查标准，通过评估被认为是宝贵的支持。

项目成果

High-Vacuum Chemical Vapor Deposition of Monolayer Hexagonal Boron Nitride on Ge(001) from Borazine

环硼嗪Ge(001)上高真空化学气相沉积单层六方氮化硼

• DOI: 10.1149/11102.0097ecst
• 发表时间: 2023
• 期刊: ECS Transactions
• 作者: Su, Katherine Anna;Li, Songying;Arnold, Michael Scott
• 通讯作者: Arnold, Michael Scott