Cracked Nanoparticle Temperature Sensor for High TCR on Stretchable Substrates
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Solution Overview
Problem
Current resistive temperature sensors face challenges in achieving high sensitivity due to limited understanding of nanoparticle transport mechanisms in stretchable PDMS substrates, particularly regarding chemical interfaces and development of patterned nanoparticle thin films, which hinders their sensitivity and reliability.
Innovation Solution
A method for manufacturing a high-sensitivity temperature sensor involving a stretchable substrate with conductive nanoparticles surrounded by organic or inorganic ligands, where thermal expansion increases the gap between cracks, enhancing resistance changes and sensitivity, utilizing a multi-layer structure with specific ligands and photoresist application for patterning through photolithography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polymer substrate is used to improve flexibility and compatibility with wearable devices, then the sensor can be applied to wearable and attachable devices, but the sensitivity and measurement precision are limited due to insufficient understanding of nanoparticle transport mechanisms
Solution Approach 1:
The patent changes the physical and chemical parameters of the polymer substrate by incorporating specific nanoparticles (silver, gold, copper, or aluminum nanoparticles with 5-50 nm diameter) and controlling their concentration (0.1-10 wt%). This modifies the substrate's electrical conductivity and thermal response characteristics, enabling high-sensitivity temperature sensing while maintaining flexibility for wearable applications.
Solution Approach 2:
The patent creates a composite material system by combining conductive nanoparticles with polymer substrates (PDMS, polyurethane, or epoxy resin). The composite structure integrates the flexibility and wearability of polymers with the high conductivity and temperature sensitivity of metal nanoparticles, achieving both adaptability to wearable devices and high measurement precision.
2Measurement precision
If the substrate area is increased through thermal expansion to enhance sensitivity, then the TCR is improved, but the manufacturing complexity increases due to the need for precise control of thermal expansion properties
Solution Approach 1:
The patent utilizes the thermal expansion of the polymer substrate to enhance the temperature coefficient of resistance. As temperature increases, the substrate expands, increasing the distance between conductive nanoparticles and reducing charge transport efficiency. This thermal expansion mechanism amplifies the resistance change signal, improving TCR and temperature sensing precision without requiring complex device structures.
3Measurement precision
If cracks are introduced in the nanoparticle layer to enhance charge transport behavior changes, then the sensitivity is improved, but the reliability and durability are reduced due to potential structural weakness
Solution Approach 1:
The patent intentionally creates a porous or cracked structure in the nanoparticle layer embedded within the polymer substrate. These cracks and pores enhance the sensitivity by amplifying charge transport behavior changes in response to temperature variations. The surrounding polymer matrix provides mechanical support that maintains structural integrity and reliability, preventing catastrophic failure while allowing the crack structure to function for enhanced sensing.
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 approach results in a temperature sensor with a higher temperature coefficient of resistance (TCR), enabling sensitive detection of external temperature changes, as demonstrated by increased resistance and improved durability in repeated temperature cycles.
Implementation Method 1
the area of the stretchable substrate increases due to thermal expansion with increasing external temperature
Implementation Method 2
The photoresist can be applied to a nanoparticle layer due to chemical bonding formed between a ligand-substituted organic ligand and a photoresist
Data Source
AI summary
Disclosed are a high-sensitivity temperature sensor and a method of manufacturing the same. A high-sensitivity temperature sensor according to an embodiment of the present disclosure includes a stretchable substrate; a first temperature-sensing layer formed on the stretchable substrate and configured to include a first temperature-sensing part in which cracks are formed by conductive nanoparticles surrounded with a second organic ligand; first and second electrodes formed to be spaced apart from each other on the first temperature-sensing layer and configured to include conductive nanoparticles surrounded with an inorganic ligand; a second temperature-sensing part formed between the first and second electrodes and cracked due to the conductive nanoparticles surrounded with the second organic ligand; a second temperature-sensing layer formed on the first and second electrodes and cracked due to the conductive nanoparticles surrounded with the second organic ligand; and a protective layer formed on the second temperature-sensing part.