Abstract
A chemical sensor for ozone based on an array of microfabricated tuning forks is described. The tuning forks are highly sensitive and stable, with low power consumption and cost. The selective detection is based on the specific reaction of the polymer with ozone. With a mass detection limit of ∼2 pg/mm2 and response time of 1 second, the sensor coated with a polymer sensing material can detect ppb-level ozone in air. The sensor is integrated into a miniaturized wearable device containing a detection circuit, filtration, battery and wireless communication chip, which is ideal for personal and microenvironmental chemical exposure monitoring.
Highlights
Ozone is a reactive constituent of urban atmospheres, associated with asthma and other health effects [1]
It is unsuitable for assessing personal exposure, which is critical for epidemiologic studies that aim to determine the link between personal ozone exposure and health
We describe an ozone sensor based on microfabricated quartz tuning forks (QTF)
Summary
Ozone is a reactive constituent of urban atmospheres, associated with asthma and other health effects [1]. Due to the lack of a suitable alternative technique, ozone exposure is currently estimated through measurements performed at regional monitoring stations [9,10,11]. This approach cannot meet the needs of measuring local ozone level variations, in indoor environments where ozone concentration can be significantly lower than outdoors. It is unsuitable for assessing personal exposure, which is critical for epidemiologic studies that aim to determine the link between personal ozone exposure and health. In outdoor urban air impacted by motor vehicle emissions, local ozone levels can be partially reduced by its reaction with nitric oxide (NO)
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