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Sensor response of FBAR device coated with polyethyleneimine-modified single walled carbon nanotubes for formaldehyde vapors at 50 ppb, 200 ppb and 400 ppb, measured at 23 °C and 40% relative humidity. Sensor shifts to different interferents such as ethanol, acetone, benzene, toluene, chloroform and dichloromethane were also recorded at concentrations twice high as of formaldehyde, adapted with permission from [109].
