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Study of NO2 sensing properties of UV activated graft comb copolymer and ZnO blends in ppm and sub-ppm range at room temperatures
* 1 , 1 , 2
1  Department of Optoelectronics, Silesian University of Technology, Krzywoustego 2 Str, Gliwice, Poland
2  Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 9 Strzody St., 44-100 Gliwice, Poland


In this work, novel organic-inorganic blend, made from PEGSil (Poly(dimetylsiloksan)-co-[poli(metylohydrosiloksane)-graft-2-winyl-poly(3-heksylthiophene)]-co-[poly(dimetylsiloksane)-graft- metakrylane ethere metylene poly(etylene glicole)]]) mixed with zinc oxide nanomaterial was studied as the sensitive layer for the nitrogen dioxide (NO2) resistance gas sensor application. Moreover, the PEGSil graft copolymer material was tested in two variants, defined by side-chain length of P3HT: shorter hexane fraction (H) and longer chloroform fraction (CH). Elaborated organic-inorganic blend was deposited on interdigital transducers (Au on Si/SiO2) by drop coating method from chlorobenzene based mixture. Sensor response characteristics to different concentrations of NO2 (1-10 ppm) in N2 carrier gas and synthetic air were measured and compared. Measurements were done at room temperature with UV light charge carriers activation. What is more, measurements for low gas concentrations (50-500 ppb) were done and analyzed. Obtained results shows that the sensitivity of fabricated sensors is about 6.8% per 1 ppb for hexane fractions of PEGSil and 9.3% for chloroform fractions in the concentration range from 50 to 200 ppb of NO2 in N2 carrier gas. This results show that blend of these materials have a huge potential as a sensing layer for NOx low concentration sensing.

Keywords: gas sensor, heterojunction, polymer, nanomaterial, low concentration, blend, zinc oxide, UV, nox, p3ht, nitrous oxides