Experimental study of the Raman strain rosette based on the carbon nanotube strain sensor

Abstract

This work presents a new technique named Raman strain rosette for the micro-strain measurement of both Raman active and Raman inactive materials. The technique is based on the theoretical model of the carbon nanotube (CNT) strain sensor that applies the resonance and polarization Raman properties of CNTs and calculates the synthetic contributions of uniformly dispersed CNTs to the entire Raman spectrum. In our work, the proposed technique is applied in different experiments on the Raman inactive materials, such as step-by-step uniaxial tensile and Raman mapping around a circular hole. The experimental results reached by the Raman strain rosette are consistent with the actual values as a whole. This study verifies that the Raman strain rosette is applicable to quantitative measurement of all the in-plane components of the strain tensor (including both normal and shear strains) by three polarized Raman detections for each sampling spot on a microscale. The technique is further applicable to achieving the strain fields through Raman mapping.

Study on Utilization of Carboxyl Group Decorated Carbon Nanotubes and Carbonation Reaction for Improving Strengths and Microstructures of Cement Paste

“…To remove or alleviate the effect of these drawbacks, the concept of incorporating fine materials from the micro-scale to the nano-scale in cement paste has been realized in recent years [1,2]. As a desired reinforcing material, a carbon nanotube (CNT) is a tube-shaped material constructed with one-atom-thick rolled sheets of carbon and it belongs to an allotrope of carbon [2,3,4,5]. CNTs are usually classified as single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) based on the concentric tube number [6].…”

Multi-fiber strains measured by micro-Raman spectroscopy: Principles and experiments

“…In the Reference [13,23,25], carbon nanotubes were regarded as "Raman stress or strain sensors" buried to the polymer matrix. In their model, the laser polarization direction is consistent with the deformation direction of the specimen, and the carbon nanotubes in the laser spot are uniformly distributed.…”

“…Except for the probe-type microforce sensing [9], optical interferometry [10] and synchrotron radiation X-ray computed tomography [11,12], Micro-Raman spectroscopy (MRS) is a powerful technique for investigating the micromechanics of carbon nanotube [13], porous silicon [14,15], fibers and fiberreinforced composites [16,17]. It is based on the fact that the Raman bands observed for fibers (such as carbon and aramid fibers) shift linearly with an applied stress or strain, thereby allowing a measurement of the fiber axial stress.…”

Self-Assembly of a Jammed Black Phosphorus Nanoribbon on a Fixed Carbon Nanotube

“…Up to now, few-layered black phosphorene has been fabricated and shaped into some nanodevices experimentally [7][8][9] . Inspired by the construction of carbon nanotube (CNT) [10][11][12][13][14] and graphene [15][16][17][18] , researchers may naturally think that a nanotube from a single-layered black phosphorene could exist [19][20] . So far, such a BP nanotube has not been discovered even in laboratory.…”