| Summary: | 碩士 === 國立中興大學 === 材料工程學研究所 === 91 === 「A two step anodization process」 was applied to fabricate AAO template, and copper nanowires were electrodeposited into AAO template. NaOH solution was used to remove the AAO template for the acquisition of high density ordered copper nanowire arrays.
Copper nanowires were thermally treated at 250℃,350℃,450℃and 650℃for 12 h in air and compared with the copper film prepared at the same conditions. Copper nanowire heated at 250℃ for 12 h in air totally transformed to cuprous oxide nanowire ,but Cu film heated at 300℃ for 12 h in air changed to cupric oxide film . The reason marked this difference may be attributed to the grain size effect of the copper nanowire which is smaller than a critical grain size (~25nm), hence Cu nanowires predominatly transform Cu2O nanowire of a higher symmetry (FCC).
The copper nanowires fabricated from electroplating method is of polycrystalline, even after heating at 250℃, the copper nanowires transfer to polycrystalline Cu2O nanowire . But with increasing annealing temerature to 650℃ , Cu nannowires would alternate to higher oxidation state of CuO nanowire with preferred orientation of (111).
The result of PL shows a blue-shift from 590 nm to 450nm of the Cu2O nanowires because of quantum confinement effect , such an effect is not observed in CuO , because of the of the size effect.
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