Large area flexible pressure/strain sensors and arrays using nanomaterials and printing techniques

Parameswaran, Chithra; Gupta, Dipti

doi:10.1186/s40580-019-0198-x

Cited by 53 publications

(24 citation statements)

References 183 publications

(196 reference statements)

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“…However, the process obviously has unique advantages and is worth to be developed continuously as a method that can be used together with or as an alternative for conventional ones to produce next-generation transparent conductors, sensors, and electronics. Since the LDP process can be applied on the thermally vulnerable polymer substrates, we expect that the LDP process will become a mainstream tool for the development of flexible and stretchable electronics [111][112][113][114][115][116][117][118][119][120] in the future. [110]…”

Section: Discussionmentioning

confidence: 99%

Laser digital patterning of conductive electrodes using metal oxide nanomaterials

et al. 2020

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As an alternative approach to the conventional deposition and photolithographic processes, the laser digital patterning (LDP) process, which is also known as the laser direct writing process, has attracted considerable attention because it is a non-photolithographic, non-vacuum, on-demand, and cost-effective electrode fabrication route that can be applied to various substrates, including heat-sensitive flexible substrates. The LDP process was initially developed using noble metal nanoparticles (NPs) such as Au and Ag because such materials are free from oxidation even in a nanosize configuration. Thus, the NPs must be fused together to form continuous conductive structures upon laser irradiation. However, common metals are easily oxidized at the nanoscale and exist in oxidized forms owing to the extremely large surface-to-volume ratio of NPs. Therefore, to fabricate conductive electrodes using common metal NPs via the LDP process, laser irradiation should be used to sinter the NPs and simultaneously induce additional photochemical reactions, such as reduction, and defect structure modification to increase the conductivity of the electrodes. This review summarizes recent studies on the LDP process in which metal oxide NPs, such as ITO, ZnO, CuO, and NiO, were exclusively utilized for fabricating conductive electrodes. The outlook of the LDP process for these materials is also discussed as a method that can be used together with or as a replacement for conventional ones to produce next-generation transparent conductors, sensors, and electronics.

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Section: Discussionmentioning

confidence: 99%

Laser digital patterning of conductive electrodes using metal oxide nanomaterials

et al. 2020

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“…The use of nanomaterials and nanoparticles with this technique has hardly been associated. This makes this technique to be less efficient, especially for other techniques like photolithography and other nanoelectromechanical systems-based techniques [91,92], which can generate high-quality nanostructure flexible sensors. The printing systems should be customized to deal with techniques like ink-jet printing and techniques handling as well as subsequently printing the nanomaterials to form the sensors.…”

Section: Current Challenges and Future Opportunitiesmentioning

confidence: 99%

Recent Progress in 3D Printed Mold-Based Sensors

Feng

Nag

et al. 2020

Sensors

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The paper presents a review of some of the significant research done on 3D printed mold-based sensors performed in recent times. The utilization of the master molds to fabricate the different parts of the sensing prototypes have been followed for quite some time due to certain distinct advantages. Some of them are easy template preparation, easy customization of the developed products, quick fabrication, and minimized electronic waste. The paper explains the different kinds of sensors and actuators that have been developed using this technique, based on their varied structural dimensions, processed raw materials, designing, and product testing. These differences in the attributes were based on their individualistic application. Furthermore, some of the challenges related to the existing sensors and their possible respective solutions have also been mentioned in the paper. Finally, a market survey has been provided, stating the estimated increase in the annual growth of 3D printed sensors. It also states the type of 3D printing that has been preferred over the years, along with the range of sensors, and their related applications.

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“…The upper substrate has 3 hemisphere bumps of 1 mm diameter which are creating contact points with the printed line to have an even pressure distribution at each point. The bump structure (also referred to in other works as porous structure, microdome structure, or force concentrator) has been applied in numerous studies [29][30][31][32]. The bump structure is a way to raise the sensitivity of the sensor as opposed to a flat layer.…”

Section: Sensor Fabricationmentioning

confidence: 99%

3D-Printable Carbon Nanotubes-Based Composite for Flexible Piezoresistive Sensors

2020

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The intersection between nanoscience and additive manufacturing technology has resulted in a new field of printable and flexible electronics. This interesting area of research tackles the challenges in the development of novel materials and fabrication techniques towards a wider range and improved design of flexible electronic devices. This work presents the fabrication of a cost-effective and facile flexible piezoresistive pressure sensor using a 3D-printable carbon nanotube-based nanocomposite. The carbon nanotubes used for the development of the material are multi-walled carbon nanotubes (MWCNT) dispersed in polydimethylsiloxane (PDMS) prepolymer. The sensor was fabricated using the direct ink writing (DIW) technique (also referred to as robocasting). The MWCNT-PDMS composite was directly printed onto the polydimethylsiloxane substrate. The sensor response was then examined based on the resistance change to the applied load. The sensor exhibited high sensitivity (6.3 Ω/kPa) over a wide range of applied pressure (up to 1132 kPa); the highest observed measurement range for MWCNT-PDMS composite in previous work was 40 kPa. The formulated MWCNT-PDMS composite was also printed into high-resolution 3-dimensional shapes which maintained their form even after heat treatment process. The possibility to use 3D printing in the fabrication of flexible sensors allows design freedom and flexibility, and structural complexity with wide applications in wearable or implantable electronics for sport, automotive and biomedical fields.

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Large area flexible pressure/strain sensors and arrays using nanomaterials and printing techniques

Cited by 53 publications

References 183 publications

Laser digital patterning of conductive electrodes using metal oxide nanomaterials

Laser digital patterning of conductive electrodes using metal oxide nanomaterials

Recent Progress in 3D Printed Mold-Based Sensors

3D-Printable Carbon Nanotubes-Based Composite for Flexible Piezoresistive Sensors

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