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We report on the synthesis of tuned energy band gap Mg ( x ) Zn ( 1 - x ) O nanofibers ( NFs ) with different Mg ( 2 + ) content via the sol - gel electrospinning ( ES ) technique wherein the addition of the doping material affects not only the morphologies of as - spun ZnAc / PVA and MgAc / ZnAc / PVA nanofibers but also the crystal microstructure and optical properties of calcined ZnO and Mg ( x ) Zn ( 1 - x ) O nanofibers .
 Chemical: Mg ( x ) Zn ( 1 - x ) O; Chemical: Mg ( 2 + ); Chemical: ZnAc; Chemical: PVA; Chemical: MgAc; Chemical: ZnAc; Chemical: PVA; Chemical: ZnO; Chemical: Mg ( x ) Zn ( 1 - x ) O
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: Mg ( x ) Zn ( 1 - x ) O; Chemical: Mg ( 2 + ); Chemical: ZnAc; Chemical: PVA; Chemical: MgAc; Chemical: ZnAc; Chemical: PVA; Chemical: ZnO; Chemical: Mg ( x ) Zn ( 1 - x ) O