A portable, wireless, and cost-effective PM2.5 sensor based on micro quartz tuning fork (MQTF) has been developed. Coated with repositionable polymer glue for effective absorption of PM2.5 and with the help of innovative nozzle inlet, the MQTF based sensor is highly sensitive to PM2.5 in the detection range of 2~2000 μg/m3 with high stability. The sensor response, change rate of the MQTF frequency, shows linear relationship with PM2.5 concentration from 6 μg/m3 to 100 μg/m3 at the flowrate of 1.7 liter per minute (L/min), which is a typical range of PM2.5 concentration in ambient air. By integrating the repositionable adhesive coated MQTF, driving and detection circuit, PM2.5 filter, sampling system, and a smartphone with Bluetooth and home-developed app, the MQTF based sensor are assembled for personal PM2.5 exposure monitoring. Furthermore, field tests show that the PM2.5 concentration readings from MQTF based sensor and commercial PM monitor correlate very well with each other, which indicates the high accuracy and reliability of the MQTF based sensor.

Original languageEnglish (US)
JournalIEEE Sensors Journal
StateAccepted/In press - Jan 1 2018


  • Air Quality
  • Biomedical monitoring
  • Coatings
  • Micro Quartz Tuning Fork
  • Monitoring
  • Optical filters
  • Optical sensors
  • Optical variables measurement
  • Particulate matter
  • Personal Exposure Monitor
  • PM2.5 Sensor

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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