Figure 3.
Cross-sectional SEM images of (a) Cu2O/ZnO NRs; (b) Cu2O/PEDOT:PSS/ZnO NRs; (c) Cu2O with hexamethylenetetramine (HMTA)/PEDOT:PSS/ZnO NRs; (d) Cu2O 25 min + Cu2O with HMTA 5 min/PEDOT:PSS/ZnO NRs heterostructure.
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