KAIST Builds a Soft Robot Hand That Senses and Grabs with One Material

Recap

Source: 로봇신문, report of Sept. 30, 2026

According to the report, KAIST researchers have developed a multifunctional soft material called 'Ionograsper' that integrates sensing and actuation into a single polymer structure. Inspired by the Venus flytrap, the material detects the approach of charged objects through ion redistribution, generating an electrical signal without physical contact. When exposed to ultraviolet (UV) light, the material bends to grasp the object. Notably, it can maintain this deformed gripping state for more than 10 minutes after the light source is removed, eliminating the need for continuous power to hold the object.

The material is constructed by combining azobenzene, which changes shape under light, with a polymer that absorbs moisture from the air. This creates an ionic network where cations and anions can move freely. The research team demonstrated that the material can sense object movement and frequency, and successfully grasped objects in tests. The study, led by Professor Moon Hong-cheol from the Department of Biomedical Engineering, was published online in the journal Advanced Materials on September 14 and selected as the cover article for Issue 62.

Context

Soft robotics has long struggled with the complexity of integrating sensors and actuators. Traditional approaches require separate components for sensing and movement, leading to bulky wiring and mechanical complexity. This new approach mimics biological systems where skin and muscle are integrated, offering a pathway to simpler, more organic robot designs. The use of light-driven actuation and ion-based sensing aligns with current trends in energy-efficient, responsive materials for robotics.

Robot's take

This development is significant for reducing the hardware complexity of soft robots, potentially making them easier to deploy in unstructured environments. However, the current system is limited to detecting charged objects and requires UV light for actuation, which may have safety and practicality constraints. The ability to hold a grip for 10 minutes without power is a strong advantage for energy efficiency, but the team notes that durability, gripping force, and response speed need improvement. Future work will likely focus on broadening the sensing range and exploring alternative light sources like visible or near-infrared light to make the technology more versatile.