Multi-Walled Carbon Nanotubes-Based Sensors for Strain Sensing Applications

Nag, Anindya; Alahi, Eshrat E.; Mukhopadhyay, Subhas Chandra; Li, Zhi

doi:10.3390/s21041261

Cited by 72 publications

(23 citation statements)

References 124 publications

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“…Nowadays, conductive polymers, such as poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) [ 33 , 34 , 35 ] and polyaniline [ 36 , 37 , 38 ], are used to develop nanocomposite-based flexible sensors [ 39 , 40 , 41 ]. Similar to polymers, certain types of nanomaterials, such as carbon-based allotropes [ 42 , 43 , 44 ] and metallic nanomaterials [ 45 , 46 , 47 ], have been used as processed materials to form sensors. The carbon allotropes include Carbon Nanotubes (CNTs) [ 48 , 49 , 50 ], graphene [ 51 , 52 , 53 ], and graphite [ 54 , 55 , 56 ], while some of the types of metallic nanomaterials are nanoparticles [ 57 , 58 ], nanoribbons [ 59 , 60 ], and nano-beads [ 61 , 62 ].…”

Section: Introductionmentioning

confidence: 99%

Wearable Sensors for Healthcare: Fabrication to Application

Mukhopadhyay

Suryadevara

Nag

2022

Sensors

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This paper presents a substantial review of the deployment of wearable sensors for healthcare applications. Wearable sensors hold a pivotal position in the microelectronics industry due to their role in monitoring physiological movements and signals. Sensors designed and developed using a wide range of fabrication techniques have been integrated with communication modules for transceiving signals. This paper highlights the entire chronology of wearable sensors in the biomedical sector, starting from their fabrication in a controlled environment to their integration with signal-conditioning circuits for application purposes. It also highlights sensing products that are currently available on the market for a comparative study of their performances. The conjugation of the sensing prototypes with the Internet of Things (IoT) for forming fully functioning sensorized systems is also shown here. Finally, some of the challenges existing within the current wearable systems are shown, along with possible remedies.

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Section: Introductionmentioning

confidence: 99%

Wearable Sensors for Healthcare: Fabrication to Application

Mukhopadhyay

Suryadevara

Nag

2022

Sensors

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“…In earlier times, when the large integrated circuits were used for sensing applications, their impact in terms of sensitivity and longevity was largely dependent on their immediate environment. As a replacement, the researchers have started fabricating small-scaled sensors [ 3 , 4 ], which not only have enhanced characteristics but can also be deployed for additional applications. The initial growth of these sensors took place as semiconducting prototypes [ 5 , 6 , 7 ], where the substrates and electrodes were formed using silicon and metallic nanoparticles such as gold, chromium, and platinum [ 8 , 9 ], respectively.…”

Section: Introductionmentioning

confidence: 99%

Integration of Different Graphene Nanostructures with PDMS to Form Wearable Sensors

Zhang

Gao

et al. 2022

Nanomaterials

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This paper presents a substantial review of the fabrication and implementation of graphene-PDMS-based composites for wearable sensing applications. Graphene is a pivotal nanomaterial which is increasingly being used to develop multifunctional sensors due to their enhanced electrical, mechanical, and thermal characteristics. It has been able to generate devices with excellent performances in terms of sensitivity and longevity. Among the polymers, polydimethylsiloxane (PDMS) has been one of the most common ones that has been used in biomedical applications. Certain attributes, such as biocompatibility and the hydrophobic nature of PDMS, have led the researchers to conjugate it in graphene sensors as substrates or a polymer matrix. The use of these graphene/PDMS-based sensors for wearable sensing applications has been highlighted here. Different kinds of electrochemical and strain-sensing applications have been carried out to detect the physiological signals and parameters of the human body. These prototypes have been classified based on the physical nature of graphene used to formulate the sensors. Finally, the current challenges and future perspectives of these graphene/PDMS-based wearable sensors are explained in the final part of the paper.

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“…This variation is inclusive of both the structure and the type of the nanomaterial. While some of the common physiochemical structures include nanotubes [26], nanobeads [27], nanoparticles [28], nanoribbons [29] and quantum dots [30], the materials can be broadly classified into carbon allotropes [31,32] and metallic nanomaterials [33,34]. The former includes Carbon Nanotubes (CNTs) [35,36], graphene [37,38] and graphite [39,40], and the latter involves some common metallic nanoparticles and nanowires.…”

Section: Introductionmentioning

confidence: 99%

Novel Surfactant-Induced MWCNTs/PDMS-Based Nanocomposites for Tactile Sensing Applications

et al. 2022

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The paper presents the use of surfactant-induced MWCNTs/PDMS-based nanocomposites for tactile sensing applications. The significance of nanocomposites-based sensors has constantly been growing due to their enhanced electromechanical characteristics. As a result of the simplified customization for their target applications, research is ongoing to determine the quality and quantity of the precursor materials that are involved in the fabrication of nanocomposites. Although a significant amount of work has been done to develop a wide range of nanocomposite-based prototypes, they still require optimization when mixed with polydimethylsiloxane (PDMS) matrices. Multi-Walled Carbon Nanotubes (MWCNTs) are one of the pioneering materials used in multifunctional sensing applications due to their high yield, excellent electrical conductivity and mechanical properties, and high structural integrity. Among the other carbon allotropes used to form nanocomposites, MWCNTs have been widely studied due to their enhanced bonding with the polymer matrix, highly densified sampling, and even surfacing throughout the composites. This paper highlights the development, characterization and implementation of surfactant-added MWCNTs/PDMS-based nanocomposites. The prototypes consisted of an optimized amount of sodium dodecyl sulfonate (SDS) and MWCNTs mixed as nanofillers in the PDMS matrix. The results have been promising in terms of their mechanical behaviour as they responded well to a maximum strain of 40%. Stable and repeatable output was obtained with a response time of 1 millisecond. The Young’s Modulus of the sensors was 2.06 MPa. The utilization of the prototypes for low-pressure tactile sensing applications is also shown here.

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Multi-Walled Carbon Nanotubes-Based Sensors for Strain Sensing Applications

Cited by 72 publications

References 124 publications

Wearable Sensors for Healthcare: Fabrication to Application

Wearable Sensors for Healthcare: Fabrication to Application

Integration of Different Graphene Nanostructures with PDMS to Form Wearable Sensors

Novel Surfactant-Induced MWCNTs/PDMS-Based Nanocomposites for Tactile Sensing Applications

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