Tungsten Oxide Nanostructure Films for Temperature-Sensitive Substrates
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Solution Overview
Problem
Existing methods for producing crystalline tungsten oxide films are not compatible with substrates that cannot withstand high temperatures, requiring expensive equipment and complex processing conditions, and often result in films with poor mechanical properties and durability.
Innovation Solution
Hydrothermal synthesis of crystalline tungsten oxide particles followed by size reduction and coating on substrates, eliminating high-temperature processing and enabling the use of substrates like glass or plastics, with improved mechanical properties and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high-temperature deposition methods (thermal evaporation, sol-gel annealing) are used to produce crystalline tungsten oxide films, then crystalline structure is achieved, but substrate compatibility is limited and processing complexity increases
Solution Approach 1:
The process is segmented into two independent stages: (1) hydrothermal synthesis of crystalline tungsten oxide particles in a separate reactor, and (2) coating of pre-formed crystalline particles onto substrates. This segmentation allows crystallization to occur in the synthesis stage without exposing the substrate to high temperatures, enabling use of temperature-sensitive substrates like plastics while maintaining crystalline structure.
Solution Approach 2:
The crystalline tungsten oxide particles are prepared in advance through hydrothermal synthesis before being coated on substrates. This preliminary crystallization action eliminates the need for post-deposition annealing, allowing direct coating on substrates that cannot withstand high temperatures.
2Stability of the object's composition
If conventional deposition methods are used, then crystalline films can be formed, but manufacturing cost increases due to expensive equipment and complex processing
Solution Approach 1:
The patent replaces complex high-temperature vacuum deposition equipment and annealing furnaces with a simpler hydrothermal synthesis system followed by low-temperature coating. The hydrothermal method uses aqueous chemistry at moderate temperatures (below 200°C) to form crystalline particles, eliminating the need for expensive vacuum systems and high-temperature furnaces.
3Stability of the object's composition
If high-temperature processing is used to form crystalline films, then crystalline phase is obtained, but film durability and mechanical properties deteriorate
Solution Approach 1:
The patent changes the temperature parameter from high-temperature processing (>400°C) to low-temperature hydrothermal synthesis (below 200°C) followed by low-temperature drying. This parameter change preserves the crystalline phase while avoiding thermal damage that would compromise film adhesion and substrate integrity, resulting in improved durability.
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 method allows for the production of durable crystalline tungsten oxide films on various substrates, enhancing electrochromic device performance and reducing manufacturing costs by avoiding high-temperature treatments.
Implementation Method 1
hydrothermal synthesis of crystalline tungsten oxide particles
Implementation Method 2
coating on substrates
Data Source
AI summary
A method of manufacturing a thin film is provided. The method includes providing a plurality of crystalline hexagonal tungsten trioxide particles, size-reducing the crystalline hexagonal tungsten trioxide particles by grinding to produce crystalline hexagonal tungsten trioxide nanostructures, and coating the crystalline hexagonal tungsten trioxide nanostructures onto a substrate to produce a thin film. An electrochromic multi-layer stack is also provided.