Percolation network of growing V_(2)O_(5) nanowires

摘要

Percolation network of the growing V_(2)O_(5) nanowires was demonstrated by devising a simple but practical method to investigate the percolation phenomena. As the reaction proceeded in the ammonium(meta) vanadate solution at room temperature, the lengths of V_(2)O_(5) nanowires increased at a speed of 0.13 μm/day at an early stage of the growth and 0.03 μm/day on the average up to 3 months. Percolation network was made by abruptly freezing the homogeneously dispersed aqueous solutions of V_(2)O_(5) nanowires in liquid nitrogen. After 7 h of aging time, an abrupt increase of the conductance was observed, revealing the satisfaction of the percolation threshold (p_(c)～0.17) at the average wire length of 40 nm.