Chemically and mechanically robust SWCNT based strain sensor with monotonous piezoresistive response for infrastructure monitoring

Ahuja, Preety; Ujjain, Sanjeev Kumar; Urita, Koki; Furuse, Ayumi; Moriguchi, Isamu; Kaneko, Katsumi

doi:10.1016/j.cej.2020.124174

Cited by 29 publications

(15 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even if several authors investigated sensing ability of PP/CNT alone [36][37][38][39][40][41][42], to the best of our knowledge, no studies investigated the possibility to use PP/CNT strain sensors directly embedded in cementitious materials. Several authors proposed the use of sensing skins or sensing elements to be applied on external surfaces of buildings/infrastructures [53][54][55][56][57]. Nevertheless, the application of sensing skins requires specialized technicians and constant maintenance due to durability issues, increasing the cost and delaying the entry into service of the building or the infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

et al. 2020

View full text Add to dashboard Cite

Polypropylene/carbon nanotubes (PP/CNTs) nanocomposites with different CNTs concentrations (i.e., 1, 2, 3, 5 and 7 wt%) were prepared and tested as strain gauges for structures monitoring. Such sensors were embedded in cementitious mortar prisms and tested in 3-point bending mode recording impedance variation at increasing load. First, thermal (differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA)), mechanical (tensile tests) and morphological (FE-SEM) properties of nanocomposites blends were assessed. Then, strain-sensing tests were carried out on PP/CNTs strips embedded in cementitious mortars. PP/CNTs nanocomposites blends with CNTs content of 1, 2 and 3 wt% did not show significant results because these concentrations are below the electrical percolation threshold (EPT). On the contrary, PP/CNTs nanocomposites with 5 and 7 wt% of CNTs showed interesting sensing properties. In particular, the best result was highlighted for the PP/CNT nanocomposite with 5 wt% CNTs for which an average gauge factor (GF) of approx. 1400 was measured. Moreover, load-unload cycles reported a good recovery of the initial impedance. Finally, a comparison with some literature results, in terms of GF, was done demonstrating the benefits deriving from the use of PP/CNTs strips as strain-gauges instead of using conductive fillers in the bulk matrix.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Figure d shows that the integrity of radial breathing patterns (RBMs) of the f+c-SWCNTs is not affected by an oxidative cutting. The ratio of the D/G peak reflects the structural integrity of SWCNTs. − Since the D/G ratio remains unchanged, the basic structure of SWCNTs remains intact during the oxidative cutting process of H 2 O 2 . As shown in Figure e, the f-SWCNTs solution before and after H 2 O 2 oxidation for 2 h is compared.…”

Section: Chemical Cutting Methodsmentioning

confidence: 99%

Cutting Methods and Perspectives of Carbon Nanotubes

Dai

Wang

2021

J. Phys. Chem. C

View full text Add to dashboard Cite

Short carbon nanotubes have a large potential application value in medicine, electronic devices, and composites. Nevertheless, the length of carbon nanotubes prepared is inconsistent and long, which limits the application range of carbon nanotubes. To cope with this problem, different cutting methods are used to fabricate short carbon nanotubes, which greatly improves the application of carbon nanotubes. Recently, much literature had described the cutting methods of these short carbon nanotubes. Here we attempt to sort out and summarize the relevant literature and highlight the most important advances in cutting methods and machining quality of carbon nanotubes. Special attention is paid to the most common and important physical cutting, chemical cutting, and physical/chemical cutting methods. Significantly, the physical chemistry processes of cutting single-walled carbon nanotubes and multiwalled carbon nanotubes are reviewed and discussed. Additionally, a summary chart is given for readers to understand the cutting methods, application fields, and cutting quality assessments of carbon nanotubes. These can enable researchers in this field to have a deeper understanding of the physical-chemical knowledge and application fields involved in the cutting process of carbon nanotubes. Finally, the conclusions of this paper are summarized, and the current technical challenges and future research opportunities of cutting methods based on carbon nanotubes have been prospected.

show abstract

“…The prerequisite for the flexible substrate is to avoid structural degradation, that is, if the sensor cannot restore its original form after large scale deformation, it will cause instable conductivity, insensitive response or even disabled sensing ability. In this case, polydimethylsiloxane (PDMS), [15][16][17] polyimide, [18,19] polyethylene terephthalate, [20,21] polyurethane, [22,23] and rubber [24,25] are often used as the flexible substrate owning to their excellent stretchability, considerable thermal and chemical stability, yet customers always suffer poor wearing experience because of the low breathability and air permeability of synthetic polymers. The structural design of conductive network involves even distribution of conductive materials and well-tailored microstructure of conductive pathway.…”

Section: Introductionmentioning

confidence: 99%

Flame‐Retardant PEDOT:PSS/LDHs/Leather Flexible Strain Sensor for Human Motion Detection

Zong

Tan

2022

Macromol. Rapid Commun.

View full text Add to dashboard Cite

Flexible piezoresistive sensors have demonstrated great potential in human–motion–detection applications. However, it still remains a challenge to fabricate strain sensors with high sensitivity, broad sensing range, and good linear response to strain. In this report, a simple and scalable fabrication strategy is developed to construct high performance strain sensors by using leather as the substrates to filtrate poly(3,4‐ethylenedioxythiophene): poly(4‐styrenesulfonate) (PEDOT:PSS) modified layered double hydroxides (LDHs) suspensions. The naturally aligned collagen fibers in leather enable size selection for the 2D conductive materials and as such dual‐conductive pathways are effectively formed on the surface and in the matrix of leather. Due to the unique design of conductive networks, the prepared sensor possesses high gauge factor (maximum value of 2326.84), tunable strain range (0–70%), fast tensile response time (160 ms), and good stability in 1000 stretching‐relaxing/compression‐relaxing cycles, making it suitable for various human motion detections including coughing and large‐scale motions of joint bending. In addition, the incorporated LDHs is a non‐toxic flame retardant, which is helpful to reduce electronic fire risk and can bring added value to the sensor.

show abstract

Chemically and mechanically robust SWCNT based strain sensor with monotonous piezoresistive response for infrastructure monitoring

Cited by 29 publications

References 47 publications

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

Cutting Methods and Perspectives of Carbon Nanotubes

Flame‐Retardant PEDOT:PSS/LDHs/Leather Flexible Strain Sensor for Human Motion Detection

Contact Info

Product

Resources

About