Evolution of nano-junctions in piezoresistive nanostrand composites

Bilodeau, R. Adam; Fullwood, David T.; Colton, John; Yeager, John D.; Bowden, Anton E.; Park, Tyler

doi:10.1016/j.compositesb.2014.11.028

Cited by 9 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following the methodology of Koecher et al, [ 289 ] Bilodeau et al [ 290 ] utilized conductive nanoindentation to determine the quantum tunneling barrier height of Sylgard 184, which was deposited on Ni substrates. Nano‐ECR experiments were done and current‐depth curves were obtained (Figure 23b).…”

Section: Applications Of Nano‐ecrmentioning

confidence: 99%

Understanding Nanoscale Plasticity by Quantitative In Situ Conductive Nanoindentation

2021

View full text Add to dashboard Cite

Electronic materials such as semiconductors, piezo‐ and ferroelectrics, and metal oxides are primary constituents in sensing, actuation, nanoelectronics, memory, and energy systems. Although significant progress is evident in understanding the mechanical and electrical properties independently using conventional techniques, simultaneous and quantitative electromechanical characterization at the nanoscale using in situ techniques is scarce. It is essential because coupling/linking electrical signal to the nanoscale plasticity provides vital information regarding the real‐time electromechanical behavior of materials, which is crucial for developing miniaturized smarter technologies. With the advent of conductive nanoindentation, researchers have been able to get valuable insights into the nanoscale plasticity (otherwise not possible by conventional means) in a wide variety of bulk and small‐volume materials, quantify the electromechanical properties, understand the dielectric breakdown phenomenon and the nature of electrical contacts in thin films, etc., by continuously monitoring the real‐time electrical signal changes during any point on the indentation load–hold–unload cycle. This comprehensive Review covers probing the electromechanical behavior of materials using in situ conductive nanoindentation, data analysis methods, the validity of the models and limitations, and electronic conduction mechanisms at the nanocontacts, quantification of resistive components, applications, progress, and existing issues, and provides a futuristic outlook.

show abstract

Section: Applications Of Nano‐ecrmentioning

confidence: 99%

Understanding Nanoscale Plasticity by Quantitative In Situ Conductive Nanoindentation

2021

View full text Add to dashboard Cite

show abstract

“…Novel piezo-responsive foam sensors placed in athletic shoes have been recently developed to accurately estimate walking 3D GRF outside of the laboratory [28]. The electromechanical behaviors of these sensors have been validated for use in various large-strain applications [2,14]. The straininduced voltage is measured by attaching a conductive material embedded in the foam to a voltage-sensing system, which correlates to the force of impact [21].…”

Section: Motivationmentioning

confidence: 99%

Functional Data Analyses of Gait Data Measured Using In-Shoe Sensors

Lee

Christensen

et al. 2018

Stat Biosci

Self Cite

View full text Add to dashboard Cite

In studies of gait, continuous measurement of force exerted by the ground on a body, or ground reaction force (GRF), provides valuable insights into biomechanics, locomotion, and the possible presence of pathology. However, gold-standard measurement of GRF requires a costly in-lab observation obtained with sophisticated equipment and computer systems. Recently, in-shoe sensors have been pursued as a relatively inexpensive alternative to in-lab measurement. In this study, we explore the properties of continuous in-shoe sensor recordings using a functional data analysis approach. Our case study is based on measurements of three healthy subjects, with more than 300 stances (defined as the period between the foot striking and lifting from the ground) per subject. The sensor data show both phase and amplitude variabilities; we separate these sources via curve registration. We examine the correlation of phase shifts across sensors within a stance to evaluate the pattern of phase variability shared across sensors. Using the registered curves, we explore possible associations between in-shoe sensor recordings and GRF measurements to evaluate the in-shoe sensor recordings as a possible surrogate for in-lab GRF measurements.

show abstract

“…A variety of matrix materials and nanoparticle fillers have been combined to produce piezoresistive materials, including polypropylene and polyurethane, nanofibers, graphene, and MWCNT [ 21 ]. As strain is applied to this class of materials, the distance between nanojunctions decreases, enabling increased quantum tunneling, a proposed cause of the extreme piezoresistive effect [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Dual-Sensing Piezoresponsive Foam for Dynamic and Static Loading

Hanson

Newton

Merrell

et al. 2023

Sensors

Self Cite

View full text Add to dashboard Cite

Polymeric foams, embedded with nano-scale conductive particles, have previously been shown to display quasi-piezoelectric (QPE) properties; i.e., they produce a voltage in response to rapid deformation. This behavior has been utilized to sense impact and vibration in foam components, such as in sports padding and vibration-isolating pads. However, a detailed characterization of the sensing behavior has not been undertaken. Furthermore, the potential for sensing quasi-static deformation in the same material has not been explored. This paper provides new insights into these self-sensing foams by characterizing voltage response vs frequency of deformation. The correlation between temperature and voltage response is also quantified. Furthermore, a new sensing functionality is observed, in the form of a piezoresistive response to quasi-static deformation. The piezoresistive characteristics are quantified for both in-plane and through-thickness resistance configurations. The new functionality greatly enhances the potential applications for the foam, for example, as insoles that can characterize ground reaction force and pressure during dynamic and/or quasi-static circumstances, or as seat cushioning that can sense pressure and impact.

show abstract

Evolution of nano-junctions in piezoresistive nanostrand composites

Cited by 9 publications

References 28 publications

Understanding Nanoscale Plasticity by Quantitative In Situ Conductive Nanoindentation

Understanding Nanoscale Plasticity by Quantitative In Situ Conductive Nanoindentation

Functional Data Analyses of Gait Data Measured Using In-Shoe Sensors

Dual-Sensing Piezoresponsive Foam for Dynamic and Static Loading

Contact Info

Product

Resources

About