XRD of the samples as-formed by PLA and further dwelled in water for days. The specific phases formed are Cu with varied extent of Zn in solid solution (denoted as α), amorphous phase (amor), cuprite (cup), and tenorite (ten) co-doped with Zn2+ and H+ (cf. text).
Lin et al. Nanoscale Research Letters 2012 7:272 doi:10.1186/1556-276X-7-272