Abstract
In this study, an integrated flexible gas sensor was developed based on a polymer/multi-walled carbon nanotube composite film by using Bluetooth wireless communication/interface technology. Polymer/multi-walled carbon nanotube composite films were deposited over a polyimide flexible substrate for building a gas sensor array by using a drop-casting method. Sensor response was acquired through interdigitated electrodes and multi-channel sensor boards, which were linked to a Bluetooth wireless transceiver. Additionally, a double-spiral-shaped heater was built into the backside of the gas sensor array as a thermostat to protect it from the influence of ambient temperature. Multi-channel sensing responses were read on a display screen via a smartphone application (app). The advantages of this system include light weight, low cost, highly integrated sensors, wireless telecommunication, and real-time functioning. Thus, it is a promising candidate for deployment in a wearable gas-sensing system used to study air pollution.
Highlights
Air pollution is a global issue that seriously impacts humans and the environment
A major source of carbon monoxide (CO) is the combustion of fossil fuels in vehicles [2]
This study focused on the development of a stand-alone wearable and wireless gas-sensing system based on a Bluetooth module
Summary
Air pollution is a global issue that seriously impacts humans and the environment. According to the World Health Organization (WHO) 2016 air quality model reports, more than 90% of the world’s population breathes air that is polluted beyond the limits specified by WHO [1]. The most common pollutants in air are carbon monoxide (CO), sulfur dioxide (SO2 ), ozone (O3 ), particulate matter (PM), and volatile organic compounds (VOCs). CO is generated when carbon-containing materials are burnt. A major source of CO is the combustion of fossil fuels in vehicles [2]. SO2 is produced mainly by the oxidation of sulfur-containing materials. Combustion of fossil fuels in power plants and refinery facilities is a major source of SO2. Bad O3 is associated with chemical reactions between oxides of nitrogen (NOx ) and VOCs. Bad O3 is associated with chemical reactions between oxides of nitrogen (NOx ) and VOCs It is produced when pollutants are emitted by cars, power plants, industrial boilers, and refinery plants in the presence of sunlight [1]. Emissions of PM2.5 and PM0.1 particles can be ascribed mainly to vehicular exhaust, road dust, and forest fires [3,4]
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