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Finally , absorption , transmission and reflectance spectra of all of the tested films were measured , suggesting the feasibility of using 3D disordered structures in photoelectrochemical reactions , due to the high absorption of photons by the surface catalyst material and trapping of light within the structure .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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