[Analysis Case] Analysis of Surface Functional Groups of Polymer Materials 2 (Chemical Modification - XPS)

This article presents a case where specific functional groups were chemically modified, and the ratio of surface functional groups (amino groups, silanol groups) was evaluated from the introduced marker elements.

Quantifying functional groups on the surface of direct materials is challenging; however, we present a case where specific functional groups were chemically modified using reagents containing heteroatoms suitable for XPS analysis, and the ratio of surface functional groups (amino groups, silanol groups) was evaluated based on the introduced heteroatoms. [Analysis Samples] 4,4'-Diaminodiphenyl ether (DADPE), OH-terminated Si wafer [Analysis Method] XPS; monochromatic Al Kα radiation (manufactured by Ulvac-PHI, PHI5000 VersaProbe II) [Analysis Results] 1. Evaluation of amino groups: We introduce a case where amino groups in 4,4'-diaminodiphenyl ether (DADPE) were modified with trifluoroacetic anhydride (TFAA). 2. Evaluation of silanol groups: We present a case where silanol groups on the surface of an OH-terminated Si wafer were modified with 1H,1H,2H,2H-perfluorooctyldimethylchlorosilane (FOCS). It is possible to determine the ratio of surface functional groups through XPS analysis of chemically modified samples. Additionally, by analyzing surfaces of samples with different material properties and comparing the ratios of surface functional groups, it is also possible to evaluate the impact of surface functional groups on material properties.

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