Zn–Cu-codoped SnO2 nanoparticles: Structural, optical, and ferromagnetic behaviors
Zulfiqar Syed1, 2, Iqbal Zainab3, Lü Jianguo1, †
       

(color online) Raman spectra of Zn–Cu-codoped SnO2 nanoparticles calcined at 400 °C and 600 °C.