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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/18807

Title: Detection of Surface Modification of Polyimide Containing Steroidal Structure as a Function of Storage Time Using Second-Order Nonlinear Optical Spectroscopy
Authors: Nguyen, Trinh Thi
Du, Wentao
Khuat, Hien Thi Thu
Mizutani, Goro
Keywords: Polyimide
Steroidal structure
Surface quality degradation
Vibrational sum frequency generation spectroscopy
Second harmonic generation
Issue Date: 2023-10-05
Publisher: The Japan Society of Vacuum and Surface Science
Magazine name: e-Journal of Surface Science and Nanotechnology
Volume: 22
Number: 1
Start page: 32
End page: 37
DOI: 10.1380/ejssnt.2023-065
Abstract: The modification of a polyimide surface containing a 30% fraction of steroidal structure was studied as a function of storage time by vibrational sum frequency generation (SFG) spectroscopy and optical second-harmonic generation (SHG). The variation of the symmetric and anti-symmetric stretching modes of the CH3 isopropyl group at the end of the side chain of the rubbed polyimide was detected in the SFG spectra after a 3-month storage time in a practical environment. It suggests that the isopropyl group might be reoriented. On the other hand, the SHG response of the same sample showed an insignificant storage-time dependence. As a result, the phenyl rings of the polyimide are judged to be unmodified after long-term storage time. The change is suggested to occur for two main reasons. One is the interaction between the polyimide polymers and the ambient water molecules. The other is the adsorption of unknown organic molecules on the polyimide surface.
Rights: Copyright (c) 2024 The Authors. Trinh Thi Nguyen, Wentao Du, Hien Thi Thu Khuat, and Goro Mizutani. e-Journal of Surface Science and Nanotechnology 22, 32–37 (2024). This is an Open Access article distributed under the terms of Creative Commons Licence CC-BY [https://creativecommons.org/licenses/by/4.0/]. Original publication is available on J-STAGE via https://doi.org/10.1380/ejssnt.2023-065.
URI: http://hdl.handle.net/10119/18807
Material Type: publisher
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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