title: A stretchable strain sensor based on a metal nanoparticle thin film for human motion detection.
abstract: Wearable strain sensors for human motion detection are being highlighted in various fields such as medical, entertainment and sports industry. In this paper, we propose a new type of stretchable strain sensor that can detect both tensile and compressive strains and can be fabricated by a very simple process. A silver nanoparticle (Ag NP) thin film patterned on the polydimethylsiloxane (PDMS) stamp by a single-step direct transfer process is used as the strain sensing material. The working principle is the change in the electrical resistance caused by the opening/closure of micro-cracks under mechanical deformation. The fabricated stretchable strain sensor shows highly sensitive and durable sensing performances in various tensile/compressive strains, long-term cyclic loading and relaxation tests. We demonstrate the applications of our stretchable strain sensors such as flexible pressure sensors and wearable human motion detection devices with high sensitivity, response speed and mechanical robustness.
authors.affiliation: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Korea. inkyu@kaist.ac.kr.
authors.forename: Jaehwan
authors.initials: J
authors.lastname: Lee
authors.forename: Sanghyeok
authors.initials: S
authors.lastname: Kim
authors.forename: Jinjae
authors.initials: J
authors.lastname: Lee
authors.forename: Daejong
authors.initials: D
authors.lastname: Yang
authors.forename: Byong Chon
authors.initials: BC
authors.lastname: Park
authors.forename: Seunghwa
authors.initials: S
authors.lastname: Ryu
authors.forename: Inkyu
authors.initials: I
authors.lastname: Park
mesh_terms: D019245:Compressive Strength; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D017097:Electric Impedance; D004563:Electrochemistry; D005385:Fingers / Q000502:physiology; D006801:Humans; D053768:Metal Nanoparticles / Q000737:chemistry*; D009038:Motion; D036103:Nanotechnology / Q000379:methods*; D011312:Pressure; D012834:Silver / Q000737:chemistry*; D013314:Stress, Mechanical; D013718:Tensile Strength; D014953:Wrist / Q000502:physiology
chemical_list: D004129:Dimethylpolysiloxanes; D012834:Silver; C013830:baysilon