A Biaxial Strain Sensor Using a Single MoS2 Grating

• Published in: Nanoscale research letters Vol. 16; no. 1; p. 31
• Main Authors: Xiang, Junxiang, Wang, Wenhui, Feng, Lantian, Feng, Chao, Huang, Meng, Liu, Ping, Ren, XiFeng, Xiang, Bin
• Format: Journal Article
• Language: English
• Published: New York Springer US 10.02.2021; Springer Nature B.V; SpringerOpen
• Subjects: Biaxial strain; Chemistry and Materials Science; Diffraction patterns; First principles; Gauges; Grating; Materials Science; Molecular Medicine; Molybdenum disulfide; MoS2; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Reflectance; Sensors; Single crystals; Strain gauges; MoS; First principles; Grating; Biaxial strain; Reflectance
• ISSN: 1556-276X; 1931-7573; 1556-276X
• DOI: 10.1186/s11671-021-03493-3

In this paper, we report a new type of MoS 2 -based grating sensor for in-plane biaxial strain gauges with a precision limit of ~ 1‰. The MoS 2 grating is numerically simulated with different biaxial strains up to 5%. Our first-principles calculations reveal that the strain sensitivity of the MoS 2 reflectance spectrum can be considered an additional strain sensor integrated with the grating structure, enabling the mapping of in-plane biaxial strains. Our experimental studies on a prototype MoS 2 -grating sensor further confirm that a strain component perpendicular to the grating period can cause intensity peak shifts in the grating’s first-order diffraction patterns. This work opens a new path towards the sensing of in-plane biaxial strain within a single-grating device. Our new approach is applicable for other materials that have predictable reflectance response under biaxial strains and the capacity to form a two-dimensional single-crystal layer.