An Investigation of Electrochemical Nucleation and Growth

摘要提案题目：电化学成核和生长的研究提案号：cts -0122909首席研究员：Alan WestInstitution：哥伦比亚大学将开展一个合作项目，研究电沉积薄膜生长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的数学模型上，该模型允许包含以前未考虑的现象。该模型将用于模拟困难的情况，如焦磷酸盐浴中的铜沉积，传统模型在这些情况下失败。模拟结果将与测量的电流瞬态和沉积核的原子力显微镜（AFM）成像进行比较。瞬时成核将涉及旋转盘实验，以表征生长过程作为过电位，铜离子浓度，焦磷酸盐浓度，pH值和对流条件的函数。这些结果有望提供机理信息和生长速率常数。渐进式成核将采用时温法和原子力显微镜对金氰化浴进行测量。这项工作可能会对电沉积以外的领域产生重大影响，乳液、气溶胶、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加工过程中找到更直接的应用。

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.