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By using super - resolution fluorescence microscopy to map out the locations of catalytic events within individual triangular and hexagonal Au nanoplates in correlation with scanning electron microscopy , we find that the catalytic activity within the flat { 111 } surface facet of a Au nanoplate exhibits a 2D radial gradient from the center toward the edges .
 Chemical: Au; Chemical: Au
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: Au; Chemical: Au