Template-based electrophoretic growth of PbZrO3 nanotubes

Photoluminescence emission of nanoporous anodic aluminum oxide films prepared in phosphoric acid

“…These results may be helpful in explaining our previous results on optimization of the room-temperature semiconductor behavior of the nanoporous layers anodized under about 115 V [10]. …”

“…To evaluate the effect of anodizing voltage, both the first and the second anodizing steps are carried out by applying similar DC voltages ranging from 100 to 130 V for fix anodizing time of 20 h. This range of voltages is selected based on our previous observation on the optimized semiconductor activity of the PAAO membranes formed via aluminum anodizing at approximately 115 V for up to about 20 h [10]. …”

“…Thus, very low efficiency of free carrier photogeneration could be attributed to PAAO at room temperature. However, an interesting semiconductor behavior is observed in the barrier layer of PAAO layers which are formed in the phosphoric acid electrolyte [7-10]. …”

One‐Dimensional Nanostructures of Ferroelectric Perovskites

“…Zhang et al88a reported, for instance, synthesis of PZT nanowires in an AAO template with 45 nm pore diameter using a long sol deposition time of 5 h. Hsu et al68e deposited an aqueous sol in AAO templates and observed that nanotubes were obtained at shorter deposition times and nanowires at longer deposition times. Nanowires can be obtained by using electrophoresis as demonstrated by Limmer et al,13, 51 but Nourmohammadi et al81, 89 only produced nanotubes when using electrophoresis, so it is definitely necessary with a careful characterization of the product to determine whether nanotubes or nanowires are produced. The different nanostructures may however rather be related to the type of template used, as Limmer et al13, 51 used porous polycarbonate templates while Nourmohammadi et al81, 89 used AAO templates.…”

“…Nanowires can be obtained by using electrophoresis as demonstrated by Limmer et al,13, 51 but Nourmohammadi et al81, 89 only produced nanotubes when using electrophoresis, so it is definitely necessary with a careful characterization of the product to determine whether nanotubes or nanowires are produced. The different nanostructures may however rather be related to the type of template used, as Limmer et al13, 51 used porous polycarbonate templates while Nourmohammadi et al81, 89 used AAO templates. Hernandez‐Sanchez et al68a deposited a Pb‐Ti sol into the two different templates and obtained nanotubes in AAO templates with 200 nm pore diameter and nanowires with large crystallites in track‐etched polycarbonate templates with 50 nm, 100 nm, and 200 nm pore diameter.…”