Sensing of NO with zirconium hydroxide via frequency-dependent electrical impedance spectroscopy.

Zirconium hydroxide has been investigated as a candidate nitrogen dioxide dielectric sensor using impedance spectroscopy analysis. Significant changes in electronic and physical properties down to our dosage minimum of 2 ppm h have been observed. Using disc-shaped pressed pellets of Zr(OH) in parallel plate geometry, we observe a maximum signal shift of 35% at 2 ppm h dosage, which increases six orders of magnitude as the dosage reaches 1000 ppm h.

Detection of an explosive simulant via electrical impedance spectroscopy utilizing the UiO-66-NH metal-organic framework.

Electrical impedance spectroscopy, in conjunction with the metal-organic framework (MOF) UiO-66-NH, is used to detect trace levels of the explosive simulant 2,6-dinitrotoluene. The combination of porosity and functionality of the MOF provides an effective dielectric structure, resulting in changes of impedance magnitude and phase angle. The promising data indicate that MOFs may be used in low-cost, robust explosive detection devices.