After immersed in Cr2(SO4)3 solution followed by calcining at different temperatures, Cr3+ doped porous anodic alumina (PAA:Cr) were prepared with different crystal structure.

• 以氧化铝模板(PAA)为母体；通过浸泡Cr2(SO4)3溶液掺入三价Cr离子；将掺杂的PAA煅烧使其晶化；不同的煅烧温度形成不同的相.