Rationally design bimetallic nanocatalysts for 1D nanomaterial synthesis

0854537 Lu，Jennifer 概述：一维纳米材料，纳米管和纳米线，提供令人兴奋的性能，从径向量子限制。沿着轴的微观尺度沿着提供了一个内在的路径来“传达/表现”这些属性。尽管进展迅速，但在广受欢迎的应用和综合之间仍存在相当大的差距。为了解决这一长期存在的障碍，使纳米技术的成果，我们提出了一个研究项目，使用纳米催化剂，以实现可控合成。纳米催化剂的性质可以通过空间位阻调节比例和化学组成来探测纳米催化剂和蒸汽前体之间的相互作用来合理和连续地调节。将阐述通过使材料掺入与扩散和沉淀同步来增强选择性生长的催化剂设计准则。将进行1D纳米材料生长的严格调查，以测试我们的中心假设-纳米催化剂和蒸汽前体之间的协同相互作用可以通过使用具有两种不同催化剂物种的双组分催化剂体系来定制溶解度和化合物形成趋势来实现。通过调节催化剂和助催化剂物种的摩尔比，将合成具有连续变化的性质的双金属纳米催化剂，从而首次系统地研究一维纳米材料生长中的纳米催化剂。新型的高对比度的二嵌段共聚物将被用于合成纳米催化剂。这些嵌段共聚物将在溶液中自组装以形成胶束，其中嵌段构成核，能够螯合广泛的金属物质。受控的自组装和金属螯合处理将被建立以产生具有可调化学组成的均匀的纳米催化剂。在这些高度工程化的纳米催化剂系统的支持下，将对纳米催化剂在生长中的作用进行系统的研究，以揭开生长的奥秘。为了利用即将获得的可控合成，将直接制造一种新颖的三维结构。技术优势：一种通用的合成策略，用于制造具有可控尺寸和成分的任何类型的纳米催化剂，为理解使用催化气相沉积技术的生长机制铺平了道路。催化剂在生长过程中的功能的先进知识将导致新的催化剂设计范例，以显着提高一维纳米材料合成的可控性。所提出的嵌段共聚物方法与IC制造完全兼容，纳米催化剂阵列可以容易地在衬底上产生。由于能够产生小而高活性的纳米催化剂，因此可以在器件衬底上直接合成极小的1D纳米材料，以实现革命性器件，例如具有极高ZT的纳米线用于能量收集和纳米线灵敏度作为生物致动器。所提出的新型3D构建块包含以3D配置平行排列的未受干扰的1D纳米材料，这将激发新的器件概念。拟议工作的成功结果将大大有助于一维纳米科学和纳米技术的进步。我们在纳米催化剂和一维纳米材料合成方面的专业知识以及免费使用最先进的设备，为拟议项目提供了坚实的科学基础和必要的基础设施。PI在两个领先的工业研究实验室（IBM和Agilent）工作了10年，积累了项目管理技能，为开展这项跨学科研究提供了必要的要素。更广泛的影响：创建一个简单但强大的纳米催化剂策略的影响将有助于更广泛的催化领域，例如生物质转化，温室气体分解和燃料电池中的氧气还原。一维纳米材料生长方面的先进知识不仅将指导现有一维纳米材料的可控合成，而且还将促进新材料系统的创建和新特性的发现。在该提案获得资助后，PI将在默塞德新落成的UC校园内创建一个全新的纳米催化研究领域。将建立一个实验室模块，并将其纳入“MSE 126纳米纤维”。通过纳米催化剂合成和一维纳米材料生长和表征的体验过程，激发学生对纳米科学和纳米技术的兴趣。PI将做出明确和协调一致的努力，通过积极招募少数民族学生在她的实验室工作，为他们的高级顶点项目，以缩小教育差距。这个高度跨学科的研究计划将为本科生和研究生提供跨领域的培训，使他们成为科学和技术的前沿，并激励其他人效仿。

0854537 Lu, Jennifer Overview: 1D nanomaterials, nanotubes and nanowires, offer exciting properties resulting from radial quantum confinement. The microscopic scale along the axis provides an intrinsic path to "communicate/manifest" these properties. Despite rapid progress, there is a considerable gap between sought-after applications and synthesis. To address this long-standing roadblock in the course of bringing nanotechnology to fruition, we are proposing a research project of using bimetallic nanocatalysts to achieve controllable synthesis. Nanocatalyst properties can be tuned rationally and continuously by stematically adjusting the ratio and chemical composition to probe the interaction between nanocatalysts and vapor precursors. A catalyst design guideline to enhance selective growth by synchronizing material incorporation with diffusion and precipitation will be set forth. A rigorous investigation of 1D nanomaterial growth will be conducted to test our central hypothesis - synergetic interaction between nanocatalysts and vapor precursors can be achieved by tailoring solubility and compound formation tendency using bimetallic catalyst systems with two distinct catalyst species. Bimetallic nanocatalysts with continuously varied properties will be synthesized by adjusting the molar ratio of catalyst and cocatalyst species, allowing a systematic study of nanocatalysts in 1D nanomaterial growth for the first time. New types of high-contrast diblock copolymers will be used to synthesize bimetallic nanocatalysts. These block copolymers will selfassemble in solution to form micelles with the block composing the core, capable of sequestering a wide range of metal species. Controlled self-assembly and metal sequestration processing will be established to yield uniform bimetallic nanocatalysts with tunable chemical composition. Empowered by these highly engineered nanocatalyst systems, a systematic investigation of the role of nanocatalysts in growth will be undertaken for unveiling the growth mystery. To harness controllable synthesis soon-to-be acquired a novel three-dimensional architecture will be directly fabricated. The scientific and technological significance of this new and unique platform will be explored.Technical Merits: A general synthetic strategy for creating nanocatalysts of any type with controlled size and composition paves a path for understanding the growth mechanisms using the catalytic vapor deposition techniques. The greatly advanced knowledge of catalyst functions in growth will culminate ina new catalyst design paradigm for significantly enhancing 1D nanomaterial synthesis controllability. The proposed block copolymer approach is fully compatible with IC fabrication, nanocatalyst arrays can be readily created on substrates. The ability to generate small and highly active nanocatalysts, extremely small 1D nanomaterials can be directly synthesized on device substrates for enabling revolutionary devices, such as nanowires with extremely high ZT for energy harvesting and ultrahigh sensitivity nanowires as bioactuators. The proposed novel 3D building block which contains undisturbed 1D nanomaterials arranged in parallel in a 3D configuration will inspire new device concepts. The successful outcome of the proposed work will greatly contribute to the advancement of 1D nanoscience and nanotechnology. Our expertise in nanocatalyst and 1D nanomaterial synthesis and free access to state-of-the-art equipment, provide a solid scientific foundation and necessary infrastructure for the proposed project. The PI's project management skills accrued over 10 years working in two leading industrial research Labs(IBM and Agilent) offer the necessary ingredients to conduct this interdisciplinary research.Broader Impact: The impact of creating a simple but powerful strategy to create nanocatalysts will contribute to the broader field of catalysis, e.g. biomass conversion, greenhouse gas decomposition and oxygen reduction in fuel cells. Greatly advanced knowledge in 1D nanomaterial growth will not only guide the controllable synthesis of a broad range of existing 1D nanomaterials but also will facilitate the creation of new material systems and the discovery of new properties as a consequence. Following the funding of the proposal, the PI will create a brand new research area in nanocatalysis at the newly commenced UC campus in Merced. A lab module will be set up and incorporated into "MSE 126 Nanofabrication". Through an experiential process with nanocatalyst synthesis and 1D nanomaterial growth and characterization, students' interest in nanoscience and nanotechnology will be stimulated. The PI will make an explicit and concerted effort to close the education gap by actively recruiting minority students to work in her lab for their senior capstone projects. This highly interdisciplinary research program will offer both undergraduate and graduate students training that cuts across fields and prepares them to be at the scientific and technological forefront and will inspire others to follow.