Presidential Young Investigators Award: Combustion Synthesisof Diamond

低压、扁平火焰燃烧器将用于在高度控制和良好表征的条件下生长金刚石。低压力，多孔塞稳定火焰具有简单的一维结构，使其能够精确建模和诊断探测，为其他类型的金刚石生长反应器的基础研究提供了显着优势。稳定的物种浓度将在放置在流动中的温度控制基底的边界层中测量。自由基种类和温度将使用激光诱导荧光、共振增强多光子电离和拉曼散射技术进行测量。红外/可见和生成将用于检测在金刚石生长过程中吸附在衬底上的分子。将建立一个反应流数值模型，并将预测的种类、温度和生长速率与实验测量值进行比较。金刚石薄膜在摩擦学、光学和电子领域的应用前景广阔，但目前生长的金刚石薄膜的质量不足以满足大多数用途。计划中的实验将是第一个在完全表征的环境中研究钻石生长的实验，并将获得有关最大生长速率和控制质量的过程的重要信息。

A low pressure, flat flame burner will be used to grow diamond under highly controlled and well characterized conditions. Low pressure, porous plug-stabilized flames have a simple one- dimensional structure which lend themselves to accurate modeling and diagnostic probing, providing a significant advantage for fundamental studies over other types of diamond growth reactors. Stable species concentrations will be measured in the boundary layer of a temperature-controlled substrate placed in the flow. Radical species and temperatures will be measured using laser-induced fluorescence, resonantly-enhanced multiphoton ionization, and Raman scattering techniques. IR/visible sum generation will be used to detect molecules adsorbed on the substrate during diamond growth. A reacting flow numerical model will be developed and predicted species, temperature, and growth rates will be compared to experimentally measured values. Diamond films appear very promising for tribological, optical, and electronic applications, but the quality of currently- grown films is insufficient for most uses. The experiments planned will be the first to study diamond growth in a thoroughly characterized environment, and should yield significant information on the processes responsible for maximizing growth rate and controlling quality.