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.

非技术摘要 在材料研究部固态和材料化学项目的支持下，威斯康星大学迈克尔·阿诺德教授和他的研究小组将通过这个项目研究超薄片状材料的制造，这些材料仅这些材料将由电绝缘体制成，其中嵌入并结合有碳原子的超小岛，并且，与普通分子一样，这些岛将具有精确定义的原子数量和精确定义的形状，碳岛也将模仿普通分子的电学和光学特性，但可以无缝集成并平放在此类硼氮片中。以前从未创建过这种精度的材料，该项目将解决合成这些材料的挑战，并发展创建这些材料所需的基本理解，这些结构有可能被用作下一代过滤器。喜欢具有创纪录效率的材料，因为材料的厚度极薄，因此有望影响与空气和水净化相关的具有社会重要性的应用，此外，所得材料有望拥有下一代电子和量子电子技术所需的特性，这对国防和繁荣具有重要影响。研究人员将通过计划的外展活动（例如威斯康星大学的 Badger Talks 倡议）向公众传达所支持的研究和科学以及一般研究和科学的信息。它们的尺寸、形状和成分几乎可以无限调整，并且可以在大规模并行尺度上创建精确的复制品，可以极大地定制分子的物理、电学和光学特性，以实现绝缘、半导体和金属行为。在材料研究部固态和材料化学项目的支持下，我们将操纵从紫外线到红外线的光子，特别是分子的类似物。多环芳烃 (PAH) 分子不是游离的，而是共价嵌入在绝缘六方氮化硼 (h-BN) 的晶体单层片中，而纳米级碳域是在 h 中自上而下制造的。 -BN 以前，这些域在形状和尺寸上相对较大和/或无序，并且没有以分子精度定义。在这里，将通过使用自下而上实现原子精确的碳域。嵌入的 PAH 分子本身将提供传统分子的精确性和可调性，但以平面、固定和原子薄的形式，分子嵌入的 h-BN 片材有望实现以前不可能的现象，包括具有精确孔隙的超薄材料。用于分子测序或筛分应用的尺寸和形状可广泛调节（通过选择性碳蚀刻）、带有功能性半导体掺杂剂的 h-BN 片材（传统绝缘），以及可单独寻址的固定化单分子。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

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: 2023-05
• 期刊: ECS Transactions
• 作者: Su, Katherine Anna;Li, Songying;Arnold, Michael Scott
• 通讯作者: Arnold, Michael Scott