Scientists have successfully developed a highly sensitive carbon monoxide sensor
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As a toxic and polluting gas, the detection of carbon monoxide in the air has always been a big problem. It is mainly derived from the incomplete combustion process of carbonaceous materials, such as cooking gas and gasoline. Because carbon monoxide is colorless and odorless, it is hard to be noticed. For a long time, scientists have never stopped researching sensors that can measure carbon monoxide concentrations. A few months ago, a joint team from the University of Oita in Japan (OIST) and the University of Toulouse in France found a new measurement method.
In order to be able to measure carbon monoxide, the researchers used extremely fine copper oxide nanowires to generate an electrical signal by chemically reacting copper oxide with carbon monoxide to obtain the concentration of carbon monoxide.
It is reported that these nanofibers involved in the reaction are very thin, only about 1/1000 of human hair. Once copper oxide filaments were used, two problems had to be solved before the panelists. One is how the nanofilaments are integrated into problems that can be adequate for manipulating equipment (sensor devices) and for simple mass production; the other is how to control the number and location of nanowires in a sensor device. At present, their relevant research and results are published in ACS Sensors.
"To obtain copper oxide nanowires, two adjacent copper micro-structures need to be heated, and then the nano-filaments will grow from the pair of micro-structures and gradually extend between the gaps." Dr. Steinhauer explained, “We have integrated the copper body into a miniature 'electric furnace' for heating. The miniature heating furnace developed by the University of Toulouse is actually a thin film that can raise the temperature to a very low power consumption. A few hundred degrees Celsius."
Thanks to this miniature "electric furnace", researchers were able to control the number and position of nano-filaments to a large extent and obtain data on electric signals on the filaments.
The final test results show that the device has unexpected sensitivity and can detect carbon monoxide at extremely low concentrations. “Miniaturization of carbon monoxide sensors using copper oxide nanofilaments and micro-heated membranes is the first step in the development of next-generation gas sensors.†Another member of the team, Professor Sowwan, commented that “compared to other measurement technologies, This approach we have developed is not only cost-effective but also suitable for mass production."
(Original title: Scientists have developed new methods for carbon monoxide measurement for next-generation sensors)