Colloidal Coating Spontaneous Crackle for Substrate Patterning
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Solution Overview
Problem
Current methods for patterning substrates with micro and submicrometer dimensional wires are limited by the difficulty in achieving large-area crackle formation without external stimuli, uncontrollable crack dimensions, and the need for expensive and corrosive chemicals, which restricts their application in electronics and optoelectronics, particularly as alternatives to Indium-tin-oxide (ITO).
Innovation Solution
A composition comprising colloidal matter in solvent, with particle sizes ranging from 10 nm to 150 nm and concentrations between 0.05 g/mL and 2 g/mL, that crackles spontaneously when applied as a film on various substrates, forming interconnected networks suitable for patterning with materials or energy inputs, enabling the fabrication of patterned substrates for electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional cracking methods are used for patterning substrates, then crack formation can be achieved, but external stimuli and complex equipment are required, increasing process complexity
Solution Approach 1:
The coating composition spontaneously crackles upon drying without requiring external stimuli such as ion beam etching, micro notches, or complex patterning equipment. The cracking is self-initiated through internal stress development during the drying process, making the system self-service and eliminating the need for sophisticated external intervention
Solution Approach 2:
The patent replaces complex mechanical and physical systems (ion beam etching equipment, micro notch creation devices, sequential patterning machinery) with a simple chemical coating process that relies on natural stress development during drying. This substitution dramatically simplifies the manufacturing system while achieving the desired crackle pattern
2Manufacturing precision
If conventional cracking methods are used, then patterning can be achieved, but crack dimensions are uncontrollable, reducing manufacturing precision
Solution Approach 1:
The patent controls crackle dimensions by adjusting formulation parameters of the coating composition, including colloidal particle size distribution, solvent composition and evaporation rate, film thickness, and drying conditions. These parameter changes enable precise control over crack width, spacing, and pattern uniformity without requiring post-processing adjustment
Solution Approach 2:
The desired crackle pattern is predetermined through careful formulation of the coating composition before application. The colloidal particle size, solvent mixture ratios, and film thickness are pre-optimized to generate specific crack dimensions upon drying, eliminating the need for post-crackling adjustment or measurement
3Ease of manufacture
If conventional patterning methods are used, then substrate patterning can be achieved, but expensive and corrosive chemicals are required, increasing cost and environmental impact
Solution Approach 1:
The patent employs a disposable coating composition that is applied as a thin film, allowed to crackle and dry, and then easily removed by simple solvent washing. This disposable approach eliminates the need for expensive, corrosive etchants and complex chemical processing systems, reducing both cost and environmental impact while achieving effective patterning
Solution Approach 2:
The coating composition acts as an intermediary sacrificial layer that temporarily provides the crackle pattern during fabrication. Once the underlying substrate is patterned through the crackle template, the coating is easily removed by benign solvents, leaving no harmful residues. This intermediary approach replaces direct use of corrosive chemicals with a removable protective layer
4Area of stationary object
If large-area crackle formation is attempted with conventional methods, then coverage can be increased, but process complexity and equipment requirements increase significantly
Solution Approach 1:
The coating composition and simple drying process are universally applicable to substrates of any size, from small laboratory samples to large industrial panels. The same basic formulation and application method scales seamlessly, eliminating the need for different equipment or processes when increasing production area
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 solution allows for the efficient patterning of large areas with controlled crackle dimensions, facilitating the use of patterned substrates in electronic devices, offering alternatives to ITO with improved flexibility, mechanical, and chemical stability, while reducing costs and environmental impact.
Implementation Method 1
The said compositions crackle spontaneously without any external stimuli when exposed to the substrate surface as a film
Data Source
AI summary
The present disclosure provides compositions comprising colloidal matter in solvent, employed for crackle formation when exposed to surface of a substrate. The said compositions crackle spontaneously without any external stimuli when exposed to the substrate surface as a film. The present disclosure also relates to substrates having a film by exposure to said composition and a method of preparing said substrate. The present disclosure also relates to patterned substrates fabricated with material or energy inputs deposited in template formed by crackling of the film and a method of preparing said patterned substrate and a kit for obtaining such substrates. The present disclosure also relates to using the said substrates for various applications specifically in the field of electronics or optoelectronics.