Flexible terahertz imaging systems with single-walled carbon nanotube films

Suzuki, Daichi; Kawano, Yukio

doi:10.1016/j.carbon.2020.01.113

Cited by 38 publications

(35 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, we previously performed nondestructive, omnidirectional imaging inspections utilizing wearable, wide‐frequency‐band photodetectors with single‐walled CNT (SWCNT) film photo/heat/electron channels. [ 16 ]…”

Section: Introductionmentioning

confidence: 99%

Series Photothermoelectric Coupling Between Two Composite Materials for a Freely Attachable Broadband Imaging Sheet

Suzuki

Kawano

2021

Advanced Photonics Research

Self Cite

View full text Add to dashboard Cite

As flexible wearable sensors and imagers are receiving attention from diverse social sectors, the freely attachable photothermoelectric (PTE) conversion technique should be evaluated to develop a highly usable safety sensor network. Although carbon nanotube (CNT)‐related materials should be effective, the key parameters/structures that maximize PTE conversion have not been clarified, thus hindering optimum device design and practical use. Herein, the flexible, sensitive broadband photodetection operation based on a coupling configuration between the CNT film photo/heat/electron channel and metal electrode is evaluated. Experimental PTE measurements and steady‐state thermal distribution simulations reveal that a series coupling of a p‐type CNT film channel and a highly negative Seebeck coefficient counter metal electrode facilitate superior photodetection performances than those of a parallel coupling configuration. Furthermore, subsequent device designs provide sensitive broadband photodetection from the millimeter‐wave to visible light wavelength regions with a minimum noise equivalent power of 5 pWHz−1/2 in an uncooled nonvacuum condition. Simultaneously, the mechanical flexibility of the proposed photodetector allows for its use in freely attachable sheet imager applications on curvilinear objects, and the nondestructive 3D photomonitoring of a defective intricately bent sample is demonstrated.

show abstract

Section: Introductionmentioning

confidence: 99%

Series Photothermoelectric Coupling Between Two Composite Materials for a Freely Attachable Broadband Imaging Sheet

Suzuki

Kawano

2021

Advanced Photonics Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…[ 34,35 ] Figure a shows a photograph of wearable and bendable CNT THz detector. As shown in Figure 1b, the induced voltage V (THz detected signal) was generated based on the photo‐thermo‐electric effect, and can be calculated as follows,

V = {140%true \int}_{- \infty}^{\infty} S (x) \frac{d T}{d x} d x

where S is the Seebeck coefficient and T is the temperature [ 24 ] (see the Supporting Information for details of the photo‐thermo‐electric effect). We assessed the durability of the bendable THz detector and the repeatability of the detection performance.…”

Section: Resultsmentioning

confidence: 99%

“…where S is the Seebeck coefficient and T is the temperature [24] (see the Supporting Information for details of the photothermo-electric effect). We assessed the durability of the bendable THz detector and the repeatability of the detection performance.…”

Section: Thermal Device Design Of Bendable Cnt Thz Detectorsmentioning

confidence: 99%

“…[22,23] In flexible THz sensing devices, materials require a high-absorption ratio in the THz frequency region and a high-conversion efficiency of illuminated THz power to electrical signals. [24] For these reasons, we used carbon nanotube (CNT) films as materials for flexible THz cameras. Nanocarbon films, which include single-layer graphene, nanoporous graphene, and CNT films, have been applied in a variety of flexible devices, such as With the widespread use of Internet-of-Things (IoT) devices, such as manufacturing machines in factories, wearable sensors, and social robots, the development of inspection techniques has been in high demand to ensure the reliability and safety of these devices.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A Terahertz Video Camera Patch Sheet with an Adjustable Design based on Self‐Aligned, 2D, Suspended Sensor Array Patterning

Suzuki

Ishibashi

et al. 2021

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Terahertz (THz) imaging is expected to become powerful tools for nondestructive inspections. To ensure the practical use of THz non-destructive monitoring, versatile THz imagers with adjustable designs that can eliminate the complexities and the bulkiness of the device are urgently required. Herein, a self-aligned filtration process for a 2D, free-standing carbon nanotube film array and its application to a THz video camera patch are reported. The presented techniques enable a) to freely design the camera size, sensor array pattern, and suspended shape according to its applications, b) to cut the camera patch into desired shapes, and c) to attach them to the objects that are intended to be measured. Real-time, non-destructive monitoring of various infrastructures is demonstrated. These results indicate that it can function regardless of restrictions, such as the shapes and locations of the measurement samples, thus providing a strong possibility for use in future non-destructive sensor networks.

show abstract

“…To this end, several studies have investigated diverse systems, photo-sources and photo-imagers including functional unmanned remote sensing robotics 17 , 18 , high-usability miniature photo-sources 19 , 20 , flexible multi-view stereoscopic photo-imagers 21 , 22 and highly efficient uncooled broadband photo-absorbent materials 23 , 24 . In a related study, Yang et al developed the thermo-phototronic effect 25 , which is based on the combination of thermoelectric effect with the photoelectric effect in some semiconductor materials 26 – 29 .…”

Section: Introductionmentioning

confidence: 99%

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Yuasa

Utaki

et al. 2021

Nat Commun

Self Cite

View full text Add to dashboard Cite

Multi-functional photo-imaging garners attention towards the development of universal safety-net sensor networks. Although there are urgent needs to comprehensively address the optical information from arbitrarily structured and located targets, investigations on multi-view sensitive broadband monitoring, being independent of the operating environment, are yet to be completed. This study presents a robot-assisted, photo-source and imager implanted, multi-view stereoscopic sensitive broadband photo-monitoring platform with reflective and transmissive switchable modes. A multifaceted photo-thermoelectric device design based on flexible carbon nanotube films facilitates the prototype demonstrations of non-destructive, target-structure-independent, free-form multi-view examinations on actual three-dimensional industrial components. Further functionalisation, namely, a portable system utilising three-dimensional printing and ultraviolet processing, achieves the unification of freely attachable photo-imagers and miniature photo-sources, enabling location-independent operation. Consequently, the non-destructive unmanned, remote, high-speed, omni-directional testing of a defective aerial miniature model winding road-bridge with a robot-assisted photo-source imager built into a multi-axis movable photo-thermoelectric monitor arm is demonstrated.

show abstract

Flexible terahertz imaging systems with single-walled carbon nanotube films

Cited by 38 publications

References 79 publications

Series Photothermoelectric Coupling Between Two Composite Materials for a Freely Attachable Broadband Imaging Sheet

Series Photothermoelectric Coupling Between Two Composite Materials for a Freely Attachable Broadband Imaging Sheet

A Terahertz Video Camera Patch Sheet with an Adjustable Design based on Self‐Aligned, 2D, Suspended Sensor Array Patterning

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Contact Info

Product

Resources

About