The sample was mixed with potassium bromide at a ratio of 1:100, ground, and pressed until a translucent sample flake was formed, with potassium bromide as the background flake. The background channel and sample channel spectrum were measured using a Bruker FTIR spectrophotometer (VERTEX 70, Bruker, Bremen, Germany) with the following parameters: scanning range 4000–400 cm−1, resolution 4 cm−1.
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