Revolutionizing Sensing Technology: The Game-Changing Sensor That Defies Conventional Limits

Introduction

In the fast-evolving world of sensor technology, innovation is not just about making incremental improvements—it’s about redefining the very parameters of what sensors can do. Our groundbreaking sensor technology, which utilizes a negative Poisson ratio, represents a paradigm shift in sensing capabilities, offering unparalleled sensitivity, flexibility, and durability.

The Innovation

Traditional piezoresistive sensors have served their purpose, but they come with limitations, particularly in environments where flexibility and precise responsiveness are critical. Our advanced sensor technology breaks free from these constraints by leveraging the unique properties of materials with a negative Poisson ratio. This allows the sensor to expand rather than contract under strain, providing a more accurate and consistent response across a variety of applications.

Why This Technology Matters

Enhanced Sensitivity and Precision: The unique material properties enable this sensor to detect minute changes in pressure and strain with greater accuracy than traditional sensors. Whether it’s in wearable technology that tracks health metrics or in automotive systems that monitor vehicle performance, this sensor delivers data you can trust.
Flexibility and Durability: Designed to flex and bend without losing integrity, this sensor is perfect for applications where movement and deformation are part of the environment. This makes it ideal for integration into wearable tech, flexible electronics, and even aerospace components where reliability under stress is paramount.
Versatile Applications: The potential uses for this sensor are vast, ranging from healthcare to automotive, robotics, and beyond. Its ability to maintain performance under varying conditions opens up new possibilities for innovation across multiple industries.

Why License This Technology?

By licensing this patent, you’re not just acquiring a new sensor—you’re gaining access to a technology that redefines what’s possible in sensing. This innovation offers your products a competitive edge, ensuring they perform at the highest level, even in the most demanding environments. It’s not just about meeting industry standards; it’s about setting them.

The Opportunity

Don’t settle for ordinary when you can offer extraordinary. License this cutting-edge sensor technology and lead the charge in the next generation of precision sensing. With this advanced sensor, you’re not just adapting to the future—you’re shaping it.

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Abstract
Claims

The present invention includes scalable and cost-effective auxetic foam sensors (AFS) created through conformably coating a thin conductive nanomaterial-sensing layer on a porous substrate having a negative Poisson’s ratio. In general, the auxetic foam sensors possess multimodal sensing capability, such as large deformation sensing, small pressure sensing, shear/torsion sensing and vibration sensing and excellent robustness in humidity environment.

What is claimed is:

1. An auxetic foam sensor comprising:

a porous substrate having a tunable negative Poisson ratio, wherein the porous substrate comprises auxetic foam; and

a piezoresistive layer covering at least a portion of the porous substrate, wherein the piezoresistive sensitivity of the auxetic foam sensor increases as the Poisson ratio of the porous substrate decreases, wherein the gauge factor (GF) of the auxetic foam sensor under tensile strain relative to under compressive strain is variable by tuning the Poisson ratio to provide superimposed and amplified tunneling resistance, wherein the superimposed and amplified tunneling resistance comprises an increase of tunneling resistance in both the transverse direction and in the stress direction when under tension, and a decrease of tunneling resistance in both the transverse direction and in the stress direction when under compression, wherein the GF of the auxetic foam sensor equals a first value when in a first tension region, and equals a second value when in a second tension region different than the first tension region, and equals a third value when under compression, wherein the first value, the second value, and the third value are different values.

2. The sensor of claim 1, wherein the Poisson ratio of the substrate is about −0.5.

3. The sensor of claim 1, wherein the piezoresistive layer comprises a conductive nanomaterial.

4. The sensor of claim 1, wherein the piezoresistive layer comprises carbon nanotubes.

5. The sensor of claim 1, wherein the piezoresistive layer is dip-coated onto the porous substrate.

6. The sensor of claim 1, wherein the piezoresistive layer is about wt 1% of the sensor.

7. The sensor of claim 1, wherein the GF of the sensor is higher under tensile strain than under compressive strain.

8. The sensor of claim 1, wherein the GF of the sensor is higher under compressive strain than under tensile strain.

9. A wearable device comprising:

an auxetic foam sensor, the auxetic foam sensor comprising:

a porous substrate having a tunable negative Poisson ratio, wherein the porous substrate comprises auxetic foam; and

10. The wearable device of claim 9, wherein the piezoresistive layer of the sensor comprises carbon nanotubes.

11. The wearable device of claim 9, wherein the wearable device is selected from a head protection device, a bio-sensing device, a gesture sensing device, a tactile sensing device and a pressure sensing device.

12. The wearable device of claim 9, wherein the GF of the sensor is higher under tensile strain than under compressive strain.

13. The wearable device of claim 9, wherein the GF of the sensor is higher under compressive strain than under tensile strain.

Title

Negative poisson ratio piezoresistive sensor and method of manufacture

Inventor(s)

Changchun Zeng, Zhiyong Liang, Yan LiSida Luo, Tao Liu

Assignee(s)

Florida State University Research Foundation Inc

Patent #

10955300

Patent Date

March 23, 2021