Mojtaba Rahimabady, Chin Yaw Tan, Sze Yu Tan, Shuting Chen, Lei Zhang, Yi Fan Chen, Kui Yao, Keyan Zang, Aurélie Humbert, Dimitri Soccol, Michael Bolt, “Dielectric nanocomposite of diphenylethylenediamine and P-type multi-walled carbon nanotube for capacitive carbon dioxide sensors,” Sensors & Actuators: B. Chemical, Vol. B 243, pp. 596–601, 2017. (http://dx.doi.org/10.1016/j.snb.2016.12.023)
Dielectric nanocomposite comprising P-type multi-walled carbon nanotube and low molecular weight organic (1R,2R)-(+)-1,2-diphenylethylenediamine, which is stabilised with an acrylate resin, is prepared and used as a sensing layer for capacitive carbon dioxide sensor operated at room temperature. It is found that adding a small amount (0.5 wt%) of P-type multi-walled carbon nanotube in diphenylethylenediamine can dramatically improve the CO2 sensitivity by ~100 times. The P-type multi-walled carbon nanotube significantly increases the transformation rate of amine to carbamate in CO2 atmosphere as a catalyst for the chemical interactive sensing mechanism. In addition, P-type multi-walled carbon nanotube substantially improves temperature and humidity cross-sensitivities. The results show that the dielectric nanocomposite of diphenylethylenediamine and P-type multi-walled carbon nanotube is promising for capacitive carbon dioxide sensing application with ppm sensitivity at room temperature.
The authors would like to acknowledge the research grant support from Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), Singapore, and NXP Semiconductors, through project IMRE/13-3P1103, and facility support from SNFC from IMRE, A*STAR.