# Flexible Piezoresistive Sensor Based on Porous PDMS/Candle Soot Foam

## TL;DR

A new flexible pressure sensor made from candle soot and PDMS foam is developed for wearable electronics.

## Contribution

A simple, low-cost method for creating a highly sensitive flexible pressure sensor using candle soot and PDMS foam.

## Key findings

- The sensor has excellent sensitivity due to its porous structure and candle soot properties.
- It can accurately detect body movements and measure finger pressing forces.
- The fully enclosed packaging design improves robustness and practicality.

## Abstract

Flexible wearable pressure sensors still face the challenges of complex structure and high manufacturing costs. In this article, we present a simple method for preparing a highly sensitive, flexible wearable pressure sensor based on candle soot and porous PDMS foam. Meanwhile, to enhance the sensor’s robustness and practicality, a fully enclosed packaging design based on PDMS film was developed. The resulting sensor demonstrates excellent sensitivity, attributed to its porous structure, rough surface, and the unique properties of candle soot. Furthermore, the developed sensor can accurately detect movements in various parts of the human body and measure the force applied during finger pressing. This innovative porous PDMS/candle soot pressure sensor shows great potential for applications in wearable electronics.