SnO₂ nanofibers prepared by wet spinning using an ordered porous alumina spinneret

Abstract

SnO2 nanofibers with uniform diameters were obtained by wet spinning using ordered anodic porous alumina as a spinneret, followed by heat treatment. Ordered alumina through-hole membrane is a suitable spinneret material for nanofiber spinning owing to its nanohole array structure with uniform-sizes holes. A polymer solution containing a Sn salt was used as a precursor solution for the wet spinning. Polymer nanofibers containing the Sn salt were continuously formed as the precursor passed through the alumina holes into a coagulating solution. Monodisperse nanofiber structures were successfully maintained, even after heat treatment at 600 °C. This process enabled the preparation of monodisperse SnO2 nanofibers with diameters below 100 nm, as well as the precise control of fiber diameter by changing the hole size of the porous alumina spinneret. The obtained SnO2 nanofibers will be useful in various functional devices.

Preparation of Ordered Anodic Porous Alumina with Single-Nanometer-Order-Size Holes by Atomic Layer Deposition

“…SEM images of ordered anodic porous alumina before (a) and after 20 (b), 30 (c), and 40 (d) ALD cycles of Al 2 O 3 . The residual Al substrate was dissolved selectively in saturated iodine methanol solution at 50 °C for 1 h …”

Polymeric Nanofibers for Drug Delivery Applications: A Recent Review

“…Polymer nanofibers are generally made of two types of polymers, natural and synthetic [ 35 – 38 ], by melt-blown method [ 39 ], template synthesis [ 40 ], self-assembly method [ 41 ], direct stretching method [ 42 ], wet spinning method [ 43 ], electrostatic spinning method, centrifugal jet spinning method, plasma-induced synthesis, pressurized spinning, solution blowing spinning [ 44 ], and other methods. Most of these techniques, however, have certain drawbacks which limit their wide applications.…”

Continuous spinning of polymer nanofibers with uniform diameters using an anodic porous alumina spinneret with holes of different diameters

“…14,15 We have reported that polymer nanofibers with uniform diameters could be obtained by extruding a polymer solution through holes of anodic porous alumina into a solidifying solution and that the diameter of the obtained polymer nanofibers can be controlled by changing the hole diameter of the anodic porous alumina spinneret. 16,17 In this process, for obtaining fine nanofibers, the aperture diameter has to be reduced. The problem to be solved, accompanied by the reduction in aperture diameters, is the pressure loss increase in the direction of depth in the spinneret.…”