AVS 51st International Symposium
    Nanometer-scale Science and Technology Tuesday Sessions
       Session NS-TuP

Paper NS-TuP7
Phase Transformation of Copper Oxide Nanowires

Tuesday, November 16, 2004, 4:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: Y.-B. Chu, National Chung Hsing University, Taiwan
Authors: H.-Y. Chen, National Tsing Hua University, Taiwan
S. Han, National Taichung Institute of Technology, Taiwan
Y.-B. Chu, National Chung Hsing University, Taiwan
H.C. Shih, National Tsing Hua University, Taiwan
Correspondent: Click to Email
The phase transformation of Cu@sub 2@O to CuO nanowires has been investigated by x-ray diffraction, transmission electron microscopy, and field emission electron microscopy. The Cu nanowires were firstly electrodeposited into anodic aluminum oxide templates with the pore size of 100 nm. After that, the specimens were annealed in air at 250°C to 900°C. The Cu completely transformed into Cu@sub 2@O above 250°C, meanwhile the CuO phase appeared above 350°C. The CuO phase increased with temperatures, whereas Cu@sub 2@O decreased significantly with annealing temperature increasing. Additionally, the Cu@sub 2@O phase completely transformed into CuO while the specimen annealed at 900°C. The phase transformation is accounted for the changes of Gibbs free energy with temperatures, and the consideration of thermodynamics is further discussed.