Catalytic Flame Synthesis of Carbon Nanotubes

碳纳米管的催化火焰合成

• 批准号: 0522556
• 负责人: Stephen Tse
• 金额: --
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0522556&HistoricalAwards=false
• 关键词: Catalytic; Flame; Synthesis; Carbon; Nanotubes

Public AbstractAward CTS-0522556PI: Stephen D. TseCatalytic Flame Synthesis of Carbon NanotubesCarbon nanotubes (CNTs) define a new class of engineering materials with remarkable physical and electromagnetic properties, with a myriad of potential applications, including high-strength polymers, copolymers, composites, ceramics, moldable forms, molecular electronics and nano-scale machines, superconductors, delivery systems of bio-molecules to cells, fuel storage and batteries, flat-panel displays, and computer memory devices. Although various techniques have been developed for the production of CNTs, including pulsed arc discharge, pulsed laser ablation, and thermal chemical-vapor deposition, they are not readily or economically scalable for large-scale applications. Combustion synthesis of materials has demonstrated a history of scalability and offers the potential for continuous, efficient, high-volume production, without the need for expensive starting materials. As such, the objective of the proposed research program is to increase fundamental understanding of the mechanisms of catalytic CNT formation and growth in electrically-assisted flames, and utilization of that understanding to define process conditions that enable high-rate and high-purity synthesis of CNTs with prescribed characteristics (e.g. single- or multi-walled, diameter, helicity). The experiments are conducted using strategic aerodynamic flow fields, i.e. flat-flame stagnation-point (premixed) and flat-flame counterflow (non-premixed), to characterize the effects of fuel composition, flame temperature, inert addition, hydrogen addition, oxygen concentration, strain rate, and other controllable process parameters on CNT properties. The influence of the nature as well as the content of the transition metal (Ni, Fe, and Co) in the substrates on the yield and the quality of the CNTs formed will be investigated, along with the influence of electric fields in controlling CNT purity, alignment, helicity, and growth rate. Advanced laser-based diagnostics including spontaneous Raman spectroscopy, laser-induced fluorescence, and tunable diode laser absorption spectroscopy are employed to determine the local gas-phase chemical species concentrations and temperatures at the specific regions of CNT formation. The CNT material properties are characterized using electron microscopy, atomic force microscopy, and surface Raman spectroscopy. The research and experimental facility are incorporated into the curriculum on nanomaterials science and engineering. The involvement of underrepresented minorities and women in engineering is increased by supporting undergraduate research as part of the Douglass Project for Rutgers Women in Math, Science, and Engineering. The training of students (at high school, undergraduate, and graduate level) for the high-technology workforce is promoted by partnering with industry, state, and Center for Nanomaterials Research.

Public AbstractAward CTS-0522556PI: Stephen D. TseCatalytic Flame Synthesis of Carbon NanotubesCarbon nanotubes (CNTs) define a new class of engineering materials with remarkable physical and electromagnetic properties, with a myriad of potential applications, including high-strength polymers, copolymers, composites, ceramics, moldable forms, molecular electronics以及纳米规模的机器，超导体，生物分子到电池的输送系统，燃料存储和电池，平板显示器以及计算机存储器。 尽管已经开发了用于生产CNT的各种技术，包括脉冲电弧排放，脉冲激光消融和热化学蒸气沉积，但对于大规模应用，它们不容易或经济上可扩展。 材料的燃烧综合证明了可扩展性的历史，并为不需要昂贵的起始材料而无需持续，高效，大批量生产。 因此，拟议的研究计划的目的是提高对电气辅助火焰中催化CNT形成和增长机制的基本理解，并利用该理解来定义可以具有处方特征的CNT合成高速和高纯度合成的过程条件（例如，单或多壁或多壁，直径，直播，螺旋）。 实验是使用策略空气动力学流场进行的，即平坦的停滞点（预混合）和平板逆流（未固定），以表征燃料温度，惰性添加，氢添加，氧气添加，氧气浓度，应变速率以及其他可控过程参数对CNT属性的影响。 将研究底物对底物的过渡金属（Ni，Fe和Co）在产量和形成的CNT质量上的影响，以及电场控制CNT纯度，对齐，螺旋和生长速率的影响。 采用晚期激光诊断，包括自发拉曼光谱，激光诱导的荧光和可调二极管激光吸收光谱谱法确定在CNT形成的特定区域的局部气相化学物质浓度和温度。 使用电子显微镜，原子力显微镜和表面拉曼光谱法对CNT材料的特性进行表征。 研究和实验设施纳入了纳米材料科学和工程的课程中。 作为Douglass Rutgers女性在数学，科学和工程学领域的Douglass项目的一部分，通过支持本科研究来增加代表性不足的少数群体和工程妇女的参与。 通过与工业，州和纳米材料研究中心合作来促进学生（高中，本科和研究生级）的学生培训（在高中，本科和研究生层面）。