Indium Tin Oxide Nanotubes via High-Rate Calcination
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Solution Overview
Problem
Existing indium tin oxide applications are limited by the use of solid nanostructures, which do not fully leverage its electrical conductivity and optical transparency, and there is a need for new forms and applications that incorporate the benefits of nanostructures like carbon nanotubes.
Innovation Solution
Manufacturing indium tin oxide nanotubes or hollow nanowires through an electrospinning process involving a polymer precursor, calcination at high heat rates, and optional infrared radiation, resulting in structures with enhanced electrical conductivity and optical transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If solid indium tin oxide nanowires are used, then electrical conductivity and optical transparency are achieved, but the applications are limited and do not fully leverage the benefits of nanostructures
Solution Approach 1:
The patent transforms the structural parameter of ITO nanostructures from solid to hollow by controlling the calcination process. This parameter change creates nanotubes with unique properties that combine the advantages of solid nanowires (electrical conductivity, optical transparency) with the benefits of hollow structures (encapsulation capability, enhanced surface area), thereby expanding application versatility
Solution Approach 2:
The patent creates a composite structure by combining ITO material with a hollow nanotube geometry. The resulting hollow ITO nanotubes integrate the functional properties of ITO (electrical conductivity, optical transparency) with the structural advantages of hollow nanostructures (encapsulation capability, high surface area to volume ratio), enabling new applications that neither solid ITO nor conventional hollow structures could achieve alone
2Shape
If high heat rate calcination is used (greater than 15°C per minute), then hollow nanotube structure is formed, but the manufacturing process becomes more complex
Solution Approach 1:
The patent utilizes phase transition during calcination to form the hollow nanotube structure. By heating at a controlled rate greater than 15°C per minute, the polymer precursor undergoes phase transition and decomposition, creating a hollow cavity while maintaining the ITO nanotube structure. This phase transition approach simplifies the process compared to methods requiring multiple steps or complex equipment
Solution Approach 2:
The patent uses a polymer precursor as an intermediary material during the electrospinning and calcination process. The polymer forms the initial fiber structure that guides ITO nanoparticle arrangement, then decomposes during high-rate calcination to create the hollow nanotube structure. This intermediary approach simplifies manufacturing by eliminating the need for complex hollowing processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting hollow indium tin oxide nanowires exhibit high electrical conductivity, thermal stability, and the ability to encapsulate materials, while maintaining optical transparency, expanding potential applications beyond traditional uses of solid ITO nanostructures.
Implementation Method 1
electrospinning fibers using the electrospinning solution
Implementation Method 2
wherein the fibers are exposed to infrared radiation during the electrospinning step
Implementation Method 3
heating the fibers to a calcination temperature at a heat rate of at least 20° C. per minute
Implementation Method 4
heating the dried fibers to a calcination temperature ranging from about 700° C. to about 1000° C.
Data Source
AI summary
A nanowire structure that includes indium tin oxide and has a hollow core.