Reliable CO2 sensors with silicon-based polymers on quartz microbalance transducers

Stepwise improvement of (hetero-) polysiloxane sensing layers for CO2 detection operated at room temperature by modification of the polymeric network

“…CuO-BaTiO 3 [8]) and hydroxylapatites [9] as well as CO 2 sensitive materials containing amino groups, such as monomeric amines [10], polymeric imines [11], hydrazines [12], triazines [13], and organically modified silicates, also named siloxanes [14,15]. A budding progress was the detection of CO 2 with work function change measurements at room temperature by investigating siloxanes which contained amino groups [16,17].…”

Application of biosensors in smart packaging

“…NDIR sensors are spectrosco pic sensors to detect CO2 level by gas absorption at a particular wavelength 48 . Chemical CO2 sensors are in corporated with polymer or solid electrolytes and can be made portable to fit into microelectronicbased sys tems 49,50 . For the detection of O2, colorimetric meth ods based on pHbased dyes such as methylene blue, thionine and polyviologen electrochromic compounds were developed 51 .…”

The concept of thin film bulk acoustic resonators as selective CO<sub>2</sub> gas sensors

“…They are also limited in the amount their size can be reduced and are thus impractical for mobile phone sensors. Other promising sensor concepts for CO 2 based on conductive (Haeusler and Meyer, 1996), electrochemical (Kaneyasu et al, 2000), and mass sensitive (Zhou et al, 1994) detection also exist. All of these sensor types, however, have one or more of the following disadvantages: high operation temperatures above 400 • C, lifetime of less than 2 years (Yamazoe and Miura, 1994), and high costs or cross-sensitivities.…”