Iota Silicone Oil (Anhui) Co., Ltd
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A research team has published a groundbreaking study in the prestigious journal Applied Surface Science (Volume 727), detailing a novel method to synergistically enhance the dielectric and mechanical properties of fluorosilicone rubber (FSR) using liquid metal (LM) and carbon nanotube (CNT) hybrids. This advance paves the way for high-performance flexible capacitive sensors crucial for the "electronic skin" of next-generation humanoid robots.
Flexible capacitive pressure sensors are essential for enabling tactile perception in robots. Traditional rigid sensors cannot conform to the curved surfaces of robotic fingers and joints. Flexible alternatives require a dielectric material that is soft, durable, yet highly sensitive to minute pressure changes.
Fluorosilicone rubber is an ideal candidate due to its chemical resistance, thermal stability, and mechanical compliance. However, pure FSR has a low dielectric constant, limiting sensor sensitivity. The challenge has been to increase the dielectric constant without compromising flexibility and low dielectric loss.
The research team's innovation involves preparing LM/CNT hybrid particles via an ultrasonic-assisted process. The liquid metal provides high conductivity, while the CNT coating ensures excellent compatibility with the FSR matrix. The synergistic effect yielded exceptional results:
High Dielectric Constant: 28.83 at 1 kHz, several times higher than pure FSR
Low Dielectric Loss Tangent: 0.38 at 1 kHz, ensuring signal purity
Low Elastic Modulus: 1.82 MPa, maintaining softness and conformability
The resulting flexible capacitive sensor demonstrated a high sensitivity coefficient of 0.354 kPa⁻¹, a response time of 260 ms, and stable performance over 1,000 cycles. This level of performance means a robot hand equipped with this "electronic skin" can not only detect the presence of an object but precisely gauge grip force—enabling it to pick up an egg without cracking it.
With humanoid robots entering production validation phases, demand for high-performance flexible sensors is exploding. This research opens new avenues for applying fluorosilicone rubber in tactile sensing and showcases the potential of advanced materials innovation.
