# Mechano-Filtering Encapsulation: A Stitching-Based Packaging Strategy Implementing Active Noise Suppression in Piezoresistive Pressure Sensors

## TL;DR

This paper introduces a new pressure sensor design that reduces noise and improves performance for wearable electronics and human-machine interfaces.

## Contribution

A dual-stage noise reduction architecture using a compressed-stitching encapsulation technique for piezoresistive pressure sensors.

## Key findings

- The sensor achieves linear response in the 3–20 kPa range with a sensitivity of 0.053 kPa−1.
- It demonstrates a 72 ms response time and 24 ms recovery speed with over 3500-cycle stability.
- The design is successfully applied to smart sport monitoring and tactile interfaces.

## Abstract

Flexible pressure sensors face the dual challenges of weak signal extraction and environmental noise suppression in wearable electronics and human-machine interfaces. This research proposes an intelligent pressure sensor utilizing chitosan/carbon nanotube/melamine sponge (CS/CNT/MS) composites, achieving high-performance sensing through a dual-stage noise reduction architecture that combines mechanical pre-filtration and electrical synergistic regulation. An innovative compressed-stitching encapsulation technique creates pressure sensors with equivalent mechanical low-pass filtering characteristics, actively eliminating interference signals below 3 kPa while maintaining linear response within the 3–20 kPa effective loading range (sensitivity: 0.053 kPa−1). The synergistic effects of CS molecular cross-linking and CNTs’ three-dimensional conductive network endow the device with a 72 ms response time, 24 ms recovery speed, and over 3500-cycle compression stability. Successful applications in smart sport monitoring and tactile interactive interfaces demonstrate a material-structure-circuit co-design paradigm for mechanical perception in complex environments.