Scientists from the University of Southampton in the United Kingdom and the Japan Institute of Advanced Science and Technology have developed a sensor that uses graphene as a raw material to detect indoor air pollution with high accuracy. This study was recently published in the journal Science Progress.
The newly developed sensor can sense carbon dioxide molecules and volatile organic compound (VOC) gas molecules from buildings and furniture supplies.
In recent years, the health problems caused by air pollution in the personal living environment are increasing day by day. The concentration of these harmful chemical gases is generally in the order of billions (ppb) and is difficult to detect with existing environmental sensing technologies because these sensors can only detect concentrations in parts per million (ppb). Gases.
The graphene sensor developed by the research team, after being energized, allows individual carbon dioxide molecules to be adsorbed onto the graphene material one by one and their concentration is detected at the molecular level. The specific method is that by monitoring the resistance value of the graphene material, the adsorption and release of the carbon dioxide molecule by the graphene material is detected in the form of a resistance “quantum†fluctuation. In the experiment, the researchers detected carbon dioxide gas at a concentration of about 30 ppb in just a few minutes.
April 25, 2016 Source: Science and Technology Daily
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