1653
The chemicals used for the synthesis of various shaped ZnO are Zn salt , sodium hydroxide and ammonia solution without other structure directing agent or surfactant needed .
 Chemical: ZnO; Chemical: Zn; Chemical: sodium hydroxide; Chemical: ammonia solution
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: ZnO; Chemical: Zn; Chemical: sodium hydroxide; Chemical: ammonia solution