One-Dimensional Oxide Nanostructures Produced by Gas Phase Reaction

Abstract

One-dimensional (1D) nanostructures are of great interest due to the promise of enhanced properties and improved device performance such as increased efficiency in solar cells by improved charge separation. There are many means of producing 1D nanostructures including chemical synthesis, lithography, template assisted growth and gas phase reaction. While all of these have their advantages and disadvantages, growth by gas phase reaction has the benefit of low cost and scalability to be used in mass production. This work outlines several of the more common growth mechanisms which utilize gas phase reactions to produce 1D nanostructures. The similarities and differences between the different mechanisms are discussed with an emphasis on the confinement of growth to 1D.

1D Titania Nanoarchitecture as Bioactive and Photoactive Coatings for Modern Implants: A Review

“…Moreover, titania nanostructures, including nanowires, obtained in anodization process or by the electrospinning method, are amorphous, and they need to be annealed in order to endow them in high crystalline form. A method, which can be applied to the formation of titania nanowires, is the thermal oxidation of Ti/Ti alloy surface under a limited supply of oxygen, in argon atmosphere [193][194][195]. The exposure or pure titanium to argon, which contains ppm of oxygen, at a flow rate of 200 cm /min caused the disappearance of nanowires.…”

“…The higher temperature impact on the formation of well-faceted equiaxed crystals indicates that one-dimensional growth at the low temperature is the result of oxidation reaction anisotrophy with the growth preferential on certain crystal faces. At higher temperatures, this anisotrophy decreases and the growth on other surface is promoted, allowing the formation of facetted crystals [194,195].…”

SnO2Nanostructure as Pollutant Gas Sensors: Synthesis, Sensing Performances, and Mechanism

“…Dinan and Akbar review some method of growth of one-dimensional nanostructure. Among them, vapor-liquid-solid method was used to grow SnO 2 nanowire [41]. Dinan and Akbar used this method to grow SnO 2 nanowire.…”

“…In their work, disk SnO 2 was used as source material and substrate for growing SnO 2 nanowire. At first, Au catalysts were deposited on SnO 2 disk and anneal at 700-800 ∘ C [41]. At this temperature, dewetting of Au film into nanoparticles occurred.…”

(Sensor Division Outstanding Achievement Award Presentation) Ceramic Gas Sensors to Oxide Nanostructures: Opportunities and Challenges

“…We have also developed a process to create nanofibers of TiO2 on Ti metal and Ti alloys via oxidation under a limited supply of oxygen [33,34]. Lately, we have succeeded in converting the 1-D TiO2 nano-fiber grown by thermal oxidation to nano-dendritic titanates by hydrothermal treatment (Figure 7) [35].…”