A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors

Abstract

We present a comparative study of two types of sensor with different transduction techniques but coated with the same sensing material to determine the effect of the transduction mechanism on the sensing performance of sensing a target analyte. For this purpose, interdigitated electrode (IDE)-based capacitors and quartz crystal microbalance (QCM)-based resonators were coated with a zeolitic–imidazolate framework (ZIF-8) metal–organic framework thin films as the sensing material and applied to the sensing of the volatile organic compound acetone. Cyclic immersion in methanolic precursor solutions technique was used for depositing the ZIF-8 thin films. The sensors were exposed to various acetone concentrations ranging from 5.3 to 26.5 vol % in N2 and characterized/compared for their sensitivity, hysteresis, long-term and short-term stability, selectivity, detection limit, and effect of temperature. Furthermore, the IDE substrates were used for resistive transduction and compared using capacitive transduction.

A silver nanoparticle-anchored UiO-66(Zr) metal–organic framework (MOF)-based capacitive H2S gas sensor

“…We fabricated IDE substrates as reported in our earlier findings. 27,39 5 mg of MOFs and their composites were added to the 1 mL of DMF solvent and stirred for 3 hours at 1000 rpm.…”

“…Our group has previously investigated the gas sensing properties of various MOFs for many toxic gases and VOCs including H2S. 4,[25][26][27] Nonetheless, all these MOFs based gas sensors are one-component systems (non-composites) and the study on improving their sensitivity is still in a bottleneck. Hence, one of the possible ways to develop a highly sensitive gas sensor that could operate at RT is to integrate two different components with different catalytic functionalities such as MOFs and noble metal nanoparticles (NPs) into a single component.…”

OFET chemical sensors: Chemical sensors based on ultrathin organic field‐effect transistors

“…However, the performances of OFET‐based chemical sensors suffer from the limited diffusion process for the external analyte molecules to arrive at the conducting channels, which are normally concentrated at the bottom of the OSC layer near the semiconductor–dielectric interface 18,32,35 . The two to five molecular layers at the OSC–dielectric interface determine the characteristics of the conduction channels and are crucial to the charge transport processes 36 .…”

Investigation on Mass Sensitivity of N-M Type Electrode Quartz Crystal Microbalance

“…Quartz crystal microbalances (QCMs) have gained increasing popularity in various fields, such as chemistry [1,2,3,4,5], biomedicine [6,7,8,9,10], and environmental fields [11,12,13,14], due to high sensitivity, simple operation principles, a digital output, and low-cost components.…”