Seeded Growth of Noble-Metal Nanocrystals
贵金属纳米晶体的种子生长
基本信息
- 批准号:1215034
- 负责人:
- 金额:$ 54.5万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2012
- 资助国家:美国
- 起止时间:2012-01-01 至 2016-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
TECHNICAL SUMMARY:This project, supported by the Solid State and Materials Chemistry (SSMC) program at NSF, will build a scientific basis for the synthesis of noble-metal nanocrystals with controlled properties for a variety of applications. The key approach is to separate and then independently control the nucleation and growth steps using a seed-mediated method. The research will be organized into four thrusts: i) Synthesis and characterization of single-crystal, cubooctahedral seeds made of Ag, Au, Pd, or Pt, and with sizes below 10 nm. The effects of capping agent, precursor, and oxidative etching on the crystallinity, yield, and size distribution of the seeds will all be examined. ii) Growth of metals same as the seeds. This work will seek to correlate the reduction kinetics with the growth modes, including site-selected overgrowth, conformal coating, and dendritic growth. It will also develop a screening method for rapid identification of capping agents capable of promoting the formation of specific facets. iii) Growth of metals different from the seeds. This work will address issues such as galvanic replacement that will occur spontaneously when the metal for seeds is more reactive than the metal to be grown by introducing a strong reducing agent to setback the replacement reaction. It will also fully explore the core-shell nanocrystals in terms of control over composition, shape, and shell thickness. iv) Properties and applications of the novel nanocrystals. In addition to a systematic study of the optical properties for nanocrystals with different sizes, shapes, and compositions, this work will investigate how the shells with various thicknesses shield the plasmonic excitation of the cores. It will also systematically investigate the effect of a substrate in forming hot spots with nanocrystals having different shapes. Furthermore, it will examine the catalytic and electrocatalytic properties of core-shell nanocrystals with both well-defined facets on the surface and tightly controlled thicknesses for the shellsNON-TECHNICAL SUMMARY:Interest in noble-metal nanocrystals with controlled sizes and shapes has grown steadily because of strong correlations between the size/shape of nanocrystals and chemical, physical, electronic, optical, magnetic, and catalytic properties. The interest has also been enhanced by the technological applications of these nanocrystals in areas ranging from catalysis (e.g., in fuel cells and catalytic converters) to biomedical research (e.g., as contrast and therapeutic agents). However, attempts to systematically and predictably control these properties have been met with limited success. One barrier is the lack of a mechanistic understanding and experimental control of the evolution pathway from atoms to nuclei, seeds, and finally nanocrystals. This work will bring significant advances to the field by unraveling the essential knowledge and design rules for synthesizing noble-metal nanocrystals with controlled sizes, shapes, morphologies, compositions, and structures crucial to various applications. This research will have profound impacts on the society in the following aspects: i) developing novel materials for sensing, biomedical applications, and catalysis that will address issues related to national security, health, environment, and energy; ii) forging links between different scientific fields that include solid state chemistry, condensed matter physics, surface science, materials science, colloid science, catalysis, and photonics; iii) enhancing both graduate and undergraduate education through multidisciplinary research and collaboration; iv) generating and disseminating new scientific knowledge resulting from the proposed work through peer-reviewed publications, reports, seminars, conference presentations, undergraduate and graduate teaching, summer school lectures, and websites; and v) promoting diversity in higher education by engaging women, minorities, and other underrepresented groups into the research program.
该项目由NSF的固态和材料化学(SSMC)计划支持,将为合成具有各种应用的可控特性的贵金属纳米晶体奠定科学基础。关键的方法是分离,然后独立控制的成核和生长步骤,使用种子介导的方法。研究将分为四个重点:i)合成和表征由Ag,Au,Pd或Pt制成的单晶,立方八面体种子,尺寸小于10 nm。将检查封端剂、前体和氧化蚀刻对晶种的结晶度、产率和尺寸分布的影响。ii)金属的生长与种子相同。这项工作将寻求相关的还原动力学与生长模式,包括选址过度生长,保形涂层,和树枝状生长。它还将开发一种快速识别能够促进特定刻面形成的封端剂的筛选方法。iii)不同于晶种的金属的生长。这项工作将解决的问题,如电流置换,将自发发生时,金属种子是更活泼的金属比通过引入强还原剂,以挫折的替代反应生长。它还将充分探索核壳纳米晶体的组成,形状和壳厚度的控制。iv)新型纳米晶体的性质和应用。除了对具有不同尺寸、形状和组成的纳米晶体的光学性质进行系统研究之外,这项工作还将研究具有不同厚度的壳如何屏蔽核的等离子体激发。它还将系统地研究衬底在形成具有不同形状的纳米晶体的热点中的作用。此外,它将研究的催化和电催化性能的核壳纳米晶体的表面上的明确的方面和严格控制的厚度shellsNON-TECHNICAL概要:在贵金属纳米晶体的兴趣与控制的大小和形状已经稳步增长,因为纳米晶体的大小/形状和化学,物理,电子,光学,磁性和催化性能之间的强相关性。这些纳米晶体在从催化(例如,在燃料电池和催化转化器中)到生物医学研究(例如,作为造影剂和治疗剂)。然而,试图系统地和可预测地控制这些属性已经遇到了有限的成功。一个障碍是缺乏对从原子到原子核、种子和最终纳米晶体的演化途径的机械理解和实验控制。这项工作将带来显着的进步,该领域的基本知识和设计规则,用于合成贵金属纳米晶体与控制的大小,形状,形态,成分和结构的各种应用至关重要。该研究将在以下方面对社会产生深远影响:i)开发用于传感,生物医学应用和催化的新型材料,以解决与国家安全,健康,环境和能源相关的问题; ii)在不同科学领域之间建立联系,包括固态化学,凝聚态物理,表面科学,材料科学,胶体科学,催化和光子学; iii)通过多学科研究和合作加强研究生和本科生教育; iv)通过同行评审的出版物、报告、研讨会、会议演示、本科生和研究生教学、暑期学校讲座和网站,产生和传播拟议工作产生的新科学知识;以及v)通过让妇女、少数族裔和其他代表性不足的群体参与研究计划来促进高等教育的多样性。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Younan Xia其他文献
Nanofibers: Generation of Electrospun Nanofibers with Controllable Degrees of Crimping Through a Simple, Plasticizer-Based Treatment (Adv. Mater. 16/2015)
纳米纤维:通过简单的增塑剂处理生成具有可控卷曲程度的静电纺丝纳米纤维(Adv. Mater. 16/2015)
- DOI:
- 发表时间:
2015 - 期刊:
- 影响因子:0
- 作者:
Wenying Liu;Justin H. Lipner;Christine H. Moran;Liangzhu Feng;Xiyu Li;S. Thomopoulos;Younan Xia - 通讯作者:
Younan Xia
Synthesis and characterization of metal nanostructures with hollow interiors
内部空心金属纳米结构的合成与表征
- DOI:
10.1117/12.504815 - 发表时间:
2003 - 期刊:
- 影响因子:0
- 作者:
Yugang Sun;Younan Xia - 通讯作者:
Younan Xia
Facile Synthesis of Pt Icosahedral Nanocrystals with Controllable Sizes for the Evaluation of Size‐Dependent Activity toward Oxygen Reduction
轻松合成尺寸可控的 Pt 二十面体纳米晶体,用于评估尺寸依赖性的氧还原活性
- DOI:
- 发表时间:
2019 - 期刊:
- 影响因子:4.5
- 作者:
Ming Zhao;J. Holder;Zitao Chen;Minghao Xie;Zhenming Cao;M. Chi;Younan Xia - 通讯作者:
Younan Xia
Marine-cloud brightening: an airborne concept
海洋云增亮:机载概念
- DOI:
10.1088/2515-7620/ad2f71 - 发表时间:
2024 - 期刊:
- 影响因子:2.9
- 作者:
C. Claudel;A. Lockley;F. Hoffmann;Younan Xia - 通讯作者:
Younan Xia
Fabrication of cell patches using scaffolds with a hexagonal array of interconnected pores (SHAIPs)
使用具有六角形互连孔阵列 (SHAIP) 的支架制造细胞贴片
- DOI:
- 发表时间:
2014 - 期刊:
- 影响因子:0
- 作者:
Yu Zhang;Younan Xia - 通讯作者:
Younan Xia
Younan Xia的其他文献
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{{ truncateString('Younan Xia', 18)}}的其他基金
High-Entropy Alloy Nanocrystals with Controlled Compositions and Surface Structures
成分和表面结构可控的高熵合金纳米晶
- 批准号:
2333595 - 财政年份:2024
- 资助金额:
$ 54.5万 - 项目类别:
Continuing Grant
Noble-Metal Nanocrystals in Metastable Phases
亚稳态贵金属纳米晶体
- 批准号:
2105602 - 财政年份:2022
- 资助金额:
$ 54.5万 - 项目类别:
Continuing Grant
Rational Synthesis of Alloy Nanocrystals with Controlled Compositions and Facets for Electrocatalysis
电催化用可控成分和晶面的合金纳米晶的合理合成
- 批准号:
2219546 - 财政年份:2022
- 资助金额:
$ 54.5万 - 项目类别:
Standard Grant
Fabrication and Scalable Production of Nanobottles
纳米瓶的制造和规模化生产
- 批准号:
2137669 - 财政年份:2021
- 资助金额:
$ 54.5万 - 项目类别:
Standard Grant
Metal-Sensitive Functionalization and Self-Assembly of Bimetallic Nanocrystals
双金属纳米晶的金属敏感功能化和自组装
- 批准号:
2002653 - 财政年份:2021
- 资助金额:
$ 54.5万 - 项目类别:
Standard Grant
Bimetallic Janus Nanocrystals and Their Derivatives
双金属Janus纳米晶及其衍生物
- 批准号:
1804970 - 财政年份:2018
- 资助金额:
$ 54.5万 - 项目类别:
Standard Grant
Continuous and Scalable Manufacturing of Platinum-Nickel Nanocatalysts for Polymer Electrolyte Membrane Fuel Cells
用于聚合物电解质膜燃料电池的铂镍纳米催化剂的连续和规模化制造
- 批准号:
1634687 - 财政年份:2016
- 资助金额:
$ 54.5万 - 项目类别:
Standard Grant
Atomic Layer-by-Layer Deposition of Pt on Pd Nanocrystals with Well-Controlled Facets
晶面可控的 Pd 纳米晶体上 Pt 原子层沉积
- 批准号:
1505441 - 财政年份:2015
- 资助金额:
$ 54.5万 - 项目类别:
Standard Grant
Towards a Quantitative Knob for Controlling the Shape of Noble-Metal Nanocrystals
用于控制贵金属纳米晶体形状的定量旋钮
- 批准号:
1505400 - 财政年份:2015
- 资助金额:
$ 54.5万 - 项目类别:
Continuing Grant
Seeded Growth of Noble-Metal Nanocrystals
贵金属纳米晶体的种子生长
- 批准号:
1104614 - 财政年份:2011
- 资助金额:
$ 54.5万 - 项目类别:
Continuing Grant
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