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In this mat , which was realized by an electrospinning technique , each component serves a unique function : the carbon coating acts as both an adsorption material for capturing pollutants and as a charge - transfer material , the Ag nanoparticles act as a visible - light sensitizing agent and also as a charge - transfer material , finally the TiO2 nanocable mat acts as a UV sensitive photocatalytic matrix and as the flexible substrate for the other functional components .
 Chemical: carbon; Chemical: Ag; Chemical: TiO2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: carbon; Chemical: Ag; Chemical: TiO2