Synthesis and electrochromic property of single-crystalline V 2 O 5 nanorod arrays by template-based deposition

Abstract

Growth and electrochemical and optical properties of single crystalline vanadium pentoxide (V 2 O 5 ) nanorod arrays were investigated. Vanadium pentoxide nanorod arrays were grown by electrochemical deposition, surface condensation induced by a pH change and sol electrophoretic deposition. Uniformly sized vanadium oxide nanorods with a length of about 10µm and diameters of 100 or 200nm were grown over a large area with near unidirectional alignment. TEM micrographs and electron diffraction patterns of V 2 O 5 nanorods clearly show the single-crystalline nature of nanorods from all three growth routes with a growth direction of [010]. The growth mechanisms of single crystal vanadium pentoxide nanorods have been discussed. The transmittance of nanorod arrays decrease more quickly under applied electric field than sol-gel derived film, which suggests nanorod array electrodes possess significantly improved charge/discharge rate. Electrochemical analysis is proves that nanorod arrays have higher efficiency than sol-gel derived film. The relationships between electrochemical and optical properties, nano and microstructures, and growth mechanisms have been discussed.

Annealing synthesis of coralline V2O5 nanorod architecture for multicolor energy-efficient electrochromic device

“…Similar with the results of literatures [12][13][14][15][16], the coralline nanorod architecture exhibited transmittance modulation in the entire investigated spectrum range, with obvious modulation from 560 to 1100 nm. The maximum transmittance modulation was ca.…”

“…When the switching time is defined as the time required for reaching 90% of a material's [23]. Takahashi et al reported that 30% transmittance modulation at 700 nm took 50 s for a V 2 O 5 nanorod array when 3.0 V was applied, whereas 300 s was required for a sol-gel V 2 O 5 film [14]. Fig.…”

“…As a widely studied oxide which can show both cathodic coloration and anodic coloration, V 2 O 5 materials not only exhibit good transmittance modulation but also show multicolor changes during the reversible Li-ion insertion/removal processes [14][15][16]. However, the diffusion coefficient of Li ions in V 2 O 5 (10 À 13 -10 À 12 cm 2 /s) and electric conductivity (10 À 3 -10 À 2 S/cm) are both low [17][18][19], and thus the intercalation process is relatively slow.…”

Growth of Colloidal Nano-particles: New Biomaterials

“…This is followed by a constant growth rate 0.034 nm/s when time reaches high values (20 seconds). Takahashi et al [13], has shown that the chemical potential affects the interface curvature and as a consequence the speed of growth is affected. However, the misaligned particles behavior can be explained in the light of production of induced grain boundary migration, through which the energy stored in dislocations and point defects at the grain boundary of a highly strained nano particles enhances re-crystallization [14].…”