Science Advances (2022). DOI: 10.1126 / sciadv.abm4349 “width =” 800 “height =” 506 “/>

Conceptual scheme of this work. (A) Photographs of sheets with extensible broadband photosensors. The sheet consists of a flexible CNT film PTE channel, elastic reading electrodes and a substrate of PU film (Fig. S1 to S4). Scale tape, 3 mm. (B) Simply compare the mechanical traceability between a flexible flexible tape and an extensible PTE sensor sheet against the motion of a 3D object. The rubber fluid tubes are wrapped with flexible tape and a stretchable scanner sheet. Both envelope configurations allow the observation of multiple views. On the other hand, the shell of the extensible sheet device advantageously follows the bending of the tube, while the flexible strip is easily detached from the tube. This means that the scanner sheet packaging configuration allows on-site monitoring of even soft moving targets. Scale tape, 5 mm. (C) Scheme of non-destructive and non-sampled, without source and label, passive and on-site dynamic photomonitoring of chemicals in liquid by simply wrapping the outer surface. The proposed device is firmly attached to curvilinear objects for transporting liquids to understand the concentration of the internal solution by scanning the BBR signal. credit: Scientific achievements (2022). DOI: 10.1126 / sciadv.abm4349

Researchers from the Institute for Scientific and Industrial Research (SANKEN) at Osaka University, in collaboration with Chuo University, Eindhoven University of Technology and the National Institute of Advanced Industrial Science and Technology, have developed a non-destructive sheet sensor for fluid quality monitoring. Using voltages generated in a layer of carbon nanotubes, the method does not require sampling, chemical labels or an external light source. The application of this study can enable on-site quality control of chemical plants or environmentally sensitive water bodies.

Monitoring the chemical content of water flowing through pipes is crucial for industrial applications, such as food or beverage production, as well as for identifying environmental pollution in wastewater that reaches the environment. However, current methods require periodic collection of test samples as well as the use of chemical reagents or labels. A new approach is needed for continuous monitoring without interruption.

Now a team of researchers has invented a flexible sheet that uses a built-in film of carbon nanotubes as a photodetector layer. When exposed to light, carbon nanotubes can produce electrical voltages that can be detected by attached electrodes. “Our extensible device is equipped with a high-sensitivity, broadband optical sensor that allows it to be attached to a wide variety of tube shapes,” say authors Lee Kou and Tepei Araki.

Changes in water temperature can also be observed passively based on black body radiation. An external terahertz or infrared light source may be used to detect impurities or inspect beverages. This allows spectroscopic methods to be applied continuously to flowing liquids. “The optical sensor sheet can easily visualize the concentration, temperature, viscosity and location of cracks and liquids in pipes, contributing to the realization of future environmental measurement systems,” say senior authors Yukio Cavanaugh and Tsuyoshi Sekitani. The researchers tested the system and found a linear response between glucose concentration and passively generated voltage.

The team hopes that this study could lead to the modernization of industrial quality control methods, in which pollutant concentrations can be monitored continuously rather than during planned collection. The study was published in Scientific achievements.

A new flexible terahertz camera can inspect objects of various shapes

More information:
Kou Li et al, Extensible broadband photosensor sheets for chemical monitoring without sampling, without source and labels by simple deformable packaging, Scientific achievements (2022). DOI: 10.1126 / sciadv.abm4349

Provided by the University of Osaka

Quote: Flexible tape fits inside a pipe to detect changes in water temperature in real time, contaminants (2022, May 23) extracted on May 23, 2022 from

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