Dynamic NMR Study of Model CMP Slurry Containing Silica Particles as Abrasives

2nd International Conference on Advanced Materials

Odeh, F.^1 ; Al-Bawab, A.^1 ; Li, Y.^2

Department of Chemistry, University of Jordan, Amman

11942, Jordan^1

Department of Chemistry, Clarkson University, Potsdam

NY

13699, United States^2

关键词: Adsorption process;    Constant temperature;    Longitudinal relaxation;    Microenvironments;    Multi-component systems;    Nuclear Magnetic Resonance (NMR);    Silica-based slurries;    Surface planarity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/305/1/012023/pdf
DOI  :  10.1088/1757-899X/305/1/012023

来源: IOP

【 摘 要 】

Chemical mechanical planarization (CMP) should provide a good surface planarity with minimal surface defectivity. Since CMP slurries are multi-component systems, it is very important to understand the various processes and interactions taking place in such slurries. Several techniques have been employed for such task, however, most of them lack the molecular recognition to investigate molecular interactions without adding probes which in turn increase complexity and might alter the microenvironment of the slurry. Nuclear magnetic resonance (NMR) is a powerful technique that can be employed in such study. The longitudinal relaxation times (T1) of the different components of CMP slurries were measured using Spin Echo-NMR (SE-NMR) at a constant temperature. The fact that NMR is non-invasive and gives information on the molecular level gives more advantage to the technique. The model CMP slurry was prepared in D2O to enable monitoring of T1for the various components' protons. SE-NMR provide a very powerful tool to study the various interactions and adsorption processes that take place in a model CMP silica based slurry which contains BTA and/or glycine and/or Cu+2ions. It was found that BTA is very competitive towards complexation with Cu+2ions and BTA-Cu complex adsorbs on silica surface.