Fig. 3: XPS spectra of the CP after fungal treatment for copper (60 days).
From: Printed technology as a comprehensive paradigm for circular economy of electronics

a Trametes versicolor, b Funalia floccosa, c Pycnoporus cinnabarinus, d Aspergillus niger HM81, e Aspergillus versicolor HM30, f Scopulariopsis brevicaulis HM03, g Thielavia sp. HM70 and h abiotic control.