TMDC Quantum Dot NTC Thermistors for Flexible Inkjet Printing
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Solution Overview
Problem
Existing NTC thermistors are limited by their bulk ceramic materials, which are not solution-processable, restricting their application due to high fabrication temperatures and inability to be used on flexible substrates, and conventional deposition methods like screen printing and spin-coating have disadvantages such as high material wastage and low resolution.
Innovation Solution
Solution-processed NTC thermistors are fabricated using transition metal dichalcogenide (TMDC) quantum dots, such as MoS2, formulated into an ink and deposited via inkjet printing, allowing for integration into flexible substrates and various applications like RFID tags and electronic skins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bulk ceramic materials are used for NTC thermistors, then stability and sensitivity are improved, but solution processability and flexibility are worsened
Solution Approach 1:
The bulk ceramic material is segmented into nanoparticles (1-100 nm scale), which fundamentally changes the material's processability while retaining the essential NTC properties. This segmentation allows the material to be dispersed in solution and deposited using low-cost techniques like screen printing, spray coating, and dip coating, eliminating the need for high-temperature sintering while maintaining stability and sensitivity.
Solution Approach 2:
The patent creates a composite system by combining ceramic nanoparticles with organic binders or polymers to form an ink formulation. This composite approach enables solution processing and flexibility while the ceramic nanoparticles provide the NTC effect. The organic matrix allows for low-temperature processing and flexible substrate integration.
2Ease of manufacture
If conventional deposition methods like screen printing are used, then ease of manufacture is improved, but material wastage and resolution are worsened
Solution Approach 1:
The patent replaces conventional mechanical deposition methods (screen printing, spin coating) with aerosol-based deposition. The ink is atomized into fine droplets that are deposited directly onto the substrate, dramatically reducing material wastage. This aerosol jet printing technique allows for precise material placement with minimal waste while maintaining ease of manufacture.
3Reliability
If high-temperature sintering is used for ceramic processing, then material stability is improved, but flexibility and applicability to flexible substrates are worsened
Solution Approach 1:
The patent fundamentally changes the processing temperature parameter from high-temperature sintering (>900°C) to low-temperature drying and curing (<200°C). This parameter change is achieved through nanoparticle segmentation and ink formulation, allowing the NTC thermistor to be processed on flexible substrates that cannot withstand high temperatures, thereby enabling flexibility and wearability applications.
4Manufacturing precision
If inkjet printing is used for deposition, then resolution and material utilization are improved, but throughput and cost-effectiveness are worsened
Solution Approach 1:
The patent develops a universal ink formulation that can be deposited using multiple techniques (aerosol jet printing, spray coating, dip coating, screen printing). This multi-functionality allows selection of the optimal deposition method based on the specific application requirements for resolution versus throughput, making the system adaptable to both high-precision and high-volume production needs.
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
This approach enables high-throughput, cost-effective production of NTC thermistors with improved stability and sensitivity, suitable for flexible substrates and novel applications, offering enhanced performance and versatility compared to traditional methods.
Implementation Method 1
Negative temperature coefficient (NTC) thermistors are the most commonly used technology in industrial applications. In an NTC thermistor, the resistance decreases with increasing temperature.
Implementation Method 2
aerosol jet printing of transition metal dichalcogenide quantum dot inks
Data Source
AI summary
Solution-processed negative temperature coefficient (NTC) thermistor devices include transition metal dichalcogenide (TMDC) quantum dots. The TMDC quantum dots may be formulated into an ink, and the ink may subsequently be deposited on a substrate and processed to form an NTC thermistor. Solution-processed NTC thermistors may be incorporated into RFID tags or as circuit protectors into electronic circuits.