10001
Here we report the synthesis of colloidal Au 2 Cd ( core ) / CdSe ( shell ) nanocrystal heterostructures , which were characterized extensively with several structural and optical techniques , including time - resolved fluorescence and broad - band transient absorption spectroscopy ( both below and above the CdSe band gap ) .
 Chemical: Au 2 Cd; Chemical: CdSe; Chemical: CdSe
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 2 Cd; Chemical: CdSe; Chemical: CdSe