Influence of the AC field intensity and frequency on composition and growth mechanism of Au-Pd alloy nanowires.
Au-Pd alloy nanowires with controllable morphology and composition are useful sensing materials for chemical and biological sensors. This report describes the preparation of such Au-Pd alloy nanowires from an aqueous solution by alternating current (AC) varied-frequency method, focusing on determining the dependence of the composition and morphology of the alloy nanowires on the electric field intensity and frequency. An electric field varied from 0.1 V x m(-1) to 0.4 x 10(6)V x m(-1) at 300 Hz frequency was used for the nucleation, followed by variation of the frequency between 1 and 20 MHz for the growth of the nanowires. The results showed that the Pd content in the alloy nanowires increased with the field intensity and frequency. The nanowire morphology with a less branching and better alignment was obtained at the increased frequency. XRD results showed that the phase structure of the alloy nanowires was face-centered cubic lattice. The nanowire compositions were shown controllable by changing the AC field intensity, frequency, as well as the metal ion ratio in the solution. The growth of the nanowires was shown to obey the Maxwell-Wanger (M-W) law.
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Gaixiu
G
Zhang
Gang
G
Yu
Fangfang
F
Chang
Lili
L
Tang
Bonian
B
Hu