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Publication Citation: Nanoimprint Lithography and the Role of Viscoelasticity in the Generation of Residual Stress in Model Polystyrene Patterns

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Author(s): Yifu Ding; Hyun W. Ro; Jing N. Zhou; Brian C. Okerberg; Jack F. Douglas; Alamgir Karim; Christopher Soles;
Title: Nanoimprint Lithography and the Role of Viscoelasticity in the Generation of Residual Stress in Model Polystyrene Patterns
Published: June 10, 2008
Abstract: Understanding polymer deformation during the nanoimprinting process is key to achieve robust polymer nanostructures. Information regarding the process can be extracted from monitoring the decay of the imprinted polymer patterns during thermal annealing. In this study, both the molecular mass and the imprinting temperature effect on the pattern decay behavior during thermal annealing are systematically investigated. We previously found that the decay rate is the fastest for highly entangled polystyrene (PS) due to the elastic recovery of the polymer caused by the residual stress created during the imprinting process. The present paper demonstrates that the level of this residual stress can be modified through the control of the imprinting temperatures.
Citation: Advanced Functional Materials
Volume: 18
Pages: pp. 1854 - 1862
Keywords: Elastic Recovery; Nanoimprint Lithography; Pattern Stability; Residual Stress
Research Areas: Nanomaterials
PDF version: PDF Document Click here to retrieve PDF version of paper (211KB)