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The supramolecular self - assembly of organic molecules on the surfaces of titanium dioxide plays an important role in nanofabrication , and it can control the formation and properties of nanostructures , leading to wide range of applications covering the fields of catalysis , coatings and fabrication of sensors and extends to the optoelectronic industry and medical usage .
 titanium dioxide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 titanium dioxide