Zinc Phthalocyanine Sensing Mechanism Quantification for Potential Application in Chemical Warfare Agent Detectors

Rapid and accurate detection of lethal volatile compounds is an emerging requirement to ensure the security of the current and future society. Since the threats are becoming more complex, the assurance of future sensing devices' performance can be obtained solely based on a thorough fundamental approach, by utilizing physics and chemistry together. In this work, we have applied thermal desorption spectroscopy (TDS) to study dimethyl methylophosphate (DMMP, sarin analogue) adsorption on zinc phthalocyanine (ZnPc), aiming to achieve the quantification of the sensing mechanism. Furthermore, we utilize a novel approach to TDS that involves quantum chemistry calculations for the determination of desorption activation energies. As a result, we have provided a comprehensive description of DMMP desorption processes from ZnPc, which is the basis for successful future applications of sarin ZnPc-based sensors. Finally, we have verified the sensing capability of the studied material at room temperature using impedance spectroscopy and took the final steps towards demonstrating ZnPc as a promising sarin sensor candidate.

Automated summary

Rapid and accurate detection of lethal volatile compounds is crucial for current and future societal security. This study utilizes thermal desorption spectroscopy (TDS) to investigate the adsorption of DMMP, a sarin analogue, on ZnPc, and employs quantum chemistry calculations to determine desorption activation energies. The comprehensive understanding of the DMMP desorption processes from ZnPc obtained in this work serves as the foundation for successful future applications of sarin ZnPc-based sensors. Impedance spectroscopy confirms the sensing capability of the studied material at room temperature, demonstrating ZnPc's potential as a promising sarin sensor candidate.