Nanocarbon-based ultrabroadband longer-wavelength camera sheet with simultaneously and visually augmented display

Carbon nanotube (CNT)-based sheet devices have played a leading role in advancing longer-wavelength (LW) photo-monitoring sheet devices for non-destructive inspections, particularly for applications involving material identification and permeable object analysis ^[1]. However, despite these advancements, current systems lack the integration of visible-light (Vis) visualization functionalities, which are essential for real- time and on-site diagnosis by human operators using compact, field-deployable configurations. Such concepts potentially facilitate on-site and real-time diagnosis by human operators at testing sites in compact system configurations of monitoring devices. Although coupling of integrated arrays with light-emitting diodes or liquid crystal displays within CNT film LW-monitoring sheets fundamentally demands complex fine-processing^[2], Projection-Mapping (PM) techniques alternatively provide high-visibility to human eyesight on arbitrary surfaces, even during their mechanical deformations^[3]. Specifically, the development of sheet devices, which collectively satisfy LW-monitoring on its front surface and PM-driven Vis-mapping on its rear side, relaxes technical limitations in non-destructive inspections. Herein, this work optimizes supporting substrate materials of a LW camera with CNT film pixels under an operating mechanism of the photo-thermoelectric (PTE) effect, suppressing interrelations by rear Vis-projection-induced responses to inherent front device behaviors, while maintaining optical visibility within their own sheet structures.

This work demonstrates nondestructive structural identification of the subject by using the difference in

transmittance of photo absorbed by the CNT film-type camera. Fig. 1. a–b show the measurement system and the structure of the camera used for the measurement. The camera in Fig. 1. b is composed of CNT and Silver paste, and the response is obtained from the temperature difference at the interface between the different materials circled in red in the figure. Figs. 1.c–d show the results of simultaneous imaging and PM on the two-dimensional plane with the 64-pixel camera device composed of membrane. The measurement system is Fig. 1. a. The subject consists of a glass plane with an aluminum metallic tape with the number “4” dotted on it. Optical transmittance is blocked everywhere except where the “4” is patterned. The results in Figs. 1.c–d shows that only the photo transmitted through the subject “4” can be measured by the camera. This work has realized nondestructive inspection using the CNT film-type camera, in which measurement and visualization of the results are performed on the same device. This achievement enables inspection according to the transmission wavelength of the inspection target and shape-independent inspection due to the flexibility of the device. In addition, since the inspection can be completed by on-site engineers, technological progress is also expected in terms of time efficiency.