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. Author manuscript; available in PMC: 2015 May 1.

Published in final edited form as: Sens Actuators B Chem. 2014 Jan 18;195:171–176. doi: 10.1016/j.snb.2013.12.110

(a) Response of the CO₂ sensor exposed to the alternating atmospheres of dry air and artificial expired air containing 5 % CO₂. The light intensity increases rapidly when the sensor was exposed to CO₂-containing atmosphere and returns to the initial value rapidly when the exposed to CO₂-free atmosphere. (b) The relationship between the maximum intensity change (indicated by ΔV, the output of the photodiode) and CO₂ concentration. The light intensity increased with the CO₂ concentration. Response vs. concentration to Langmuir-like equation is shown in the figure insert.

(a) Response of the CO₂ sensor exposed to the alternating atmospheres of dry air and artificial expired air containing 5 % CO₂. The light intensity increases rapidly when the sensor was exposed to CO₂-containing atmosphere and returns to the initial value rapidly when the exposed to CO₂-free atmosphere. (b) The relationship between the maximum intensity change (indicated by ΔV, the output of the photodiode) and CO₂ concentration. The light intensity increased with the CO₂ concentration. Response vs. concentration to Langmuir-like equation is shown in the figure insert.