An Investigation of Electrochemical Nucleation and Growth

建议标题：电化学成核和生长研究建议编号：CTS-0122909首席研究员：艾伦·韦斯特研究所：哥伦比亚大学将开展一项合作工作，研究电沉积薄膜生长的早期阶段的成核和生长。这项工作将建立在最近开发的电化学成核数学模型的基础上，该模型允许包含以前没有考虑过的现象。该模型将用于模拟困难的情况，例如焦磷酸盐溶液中的铜沉积，而传统的模型无法实现这一点。模拟结果将与测量的电流瞬变和原子力显微镜(AFM)沉积核的成像进行比较。瞬时成核将涉及旋转圆盘实验，以表征作为过电位、铜离子浓度、焦磷酸盐浓度、pH和对流条件的函数的生长过程。这些结果有望提供机理信息和生长速率常数。用计时电流法和原子力显微镜测量氰化金镀液中的渐进成核。这项工作可能会对电沉积以外的领域产生重大影响，乳剂、气雾剂、胶束和结晶等领域也可能从该项目中受益。这项工作可能会在微制造工艺中得到更直接的应用。

AbstractProposal Title: An Investigation of Electrochemical Nucleation and GrowthProposal Number: CTS-0122909Principal Investigator: Alan WestInstitution: Columbia UniversityA collaborative effort to study nucleation and growth during the early stages of thin film growth by electrodeposition will be carried out. This work will build on a recently developed mathematical model of electrochemical nucleation that allows inclusion of phenomena not previously considered. The model will be used in the simulation of difficult cases, such as copper deposition from pyrophosphate bath, where conventional models fail. Simulated results will be compared with both measured current transients and atomic force microscopy (AFM) imaging of deposited nuclei. Instantaneous nucleation will involve rotating disk experiments to characterize growth processes as a function of overpotential, cupric ion concentration, pyrophosphate concentration, pH and convective conditions. These results are expected to provide mechanistic information and growth rate constants. Progressive nucleation will be pursued with chronoamperometry and AFM measurements on gold cyanide baths. This work could have significant impact outside of electrodeposition, and areas such as emulsions, aerosols, micelles, and crystallization could also benefit from this project. This work may find more immediate application in microfabrication processes.