Design and Operation of a MEMS-Based Material Testing System for Nanomechanical Characterization

• Published in: Journal of microelectromechanical systems 2007-10, Vol.16 (5), p.1219-1231
• Main Authors: Espinosa, H.D., Yong Zhu, Moldovan, N.
• Format: Article
• Language: English
• Subjects: Actuators; Applied sciences; Capacitive sensing; Capacitive sensors; Carbon nanotubes; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Displacement; Exact sciences and technology; in situ microscopy; Inorganic materials; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; load sensor; Materials science; Materials testing; Mechanical and acoustical properties of condensed matter; Mechanical engineering. Machine design; Mechanical instruments, equipment and techniques; Mechanical properties of nanoscale materials; Mechanical sensors; Micromechanical devices and systems; Nanocomposites; Nanomaterials; nanomechanics; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Nanostructures; Nanotechnology; Nanotubes; Nanowires; Physics; Precision engineering, watch making; Scanning electron microscopy; Sensors; Transmission electron microscopy
• ISSN: 1057-7157; 1941-0158
• DOI: 10.1109/JMEMS.2007.905739

In situ mechanical characterization of nanostructures, such as carbon nanotubes and metallic nanowires, in scanning and transmission electron microscopes is essential for the understanding of material behavior at the nanoscale. This paper describes the design, fabrication, and operation of a novel microelectromechanical-systems (MEMS)-based material testing system used for in situ tensile testing of nanostructures. The device consists of an actuator and a load sensor with a specimen in between. Two types of actuators, in-plane thermal and comb drive actuators, are used to pull the specimens in displacement control and force control modes, respectively. The load sensor works based on differential capacitive sensing, from which the sensor displacement is recorded. By determining sensor stiffness from mechanical resonance measurements, the load on the specimen is obtained. Load sensors with different stiffness were fabricated. The best resolutions were achieved with load sensors that are designed for testing nanotubes, reaching 0.05 fF in capacitance, 1 nm in displacement, and 12 nN in load. For the first time, this MEMS-based material testing scheme offers the possibility of continuous observation of the specimen deformation and fracture with subnanometer resolution, while simultaneously measuring the applied load electronically with nano-Newton resolution. The overall device performance is demonstrated by testing freestanding cofabricated polysilicon films and multiwalled carbon nanotubes.