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Ferroelectric materials undergo a phase transition from a paraelectric high temperature phase to a lower temperature ferroelectric phase with a remnant polarization whose direction can be switched by an external electric field. These materials are currently used in radio-frequency and nonvolatile memories, and
have also potential for nanoscale applications . The manipulation of domains by applying voltages at the surface of thin films has recently motivated several studies that explore surface reactivity. Alterations in chemical reactions have been observed on ferroelectric domains, and in previous studies we have pointed out the influence of the ferroelectric state of bulk in gas adsorption processes. Ferroelectric Pb(Nb,Zr,Ti)O3 (PNZT) thin films have become one of most promising materials for electronic applications, but only few works report on the influence of gases on their ferroelectric performance. On the other hand, due to energetic and environmental priorities, innovation is nowadays required in order to develop new competitive technologies for sensing and capturing CO2 gas.
To our knowledge, this is the first report regarding the influence of CO2 adsorption in the ferroelectric behavior of PNZT thin films. The gas adsorption was detected by performing Auger spectroscopy in the surface of the sample and the ferroelectric measurements were performed in situ before and after the gas dosing.
