A new method to reduce the desorption time of a QCM sensor, using a halogen spot for heating

An inkjet-printed chemical fuse

“…[DOI: 10.1063/1.1846950] Legislation concerning the permitted levels of chemicals in the atmosphere together with the public awareness of environmental and health issues have made the detection of pollutants a high research priority for scientists and engineers. [1][2][3][4] There are many physical principles upon which sensing systems might be based; changes in electrical resistance (chemiresistors), 5,6 refractive index (fibre optic sensors), 7 and mass (quartz microbalance) 8 have all been exploited. The main challenges in the development of sensors are in the production of cheap, reproducible, and reliable devices with adequate sensitivities and selectivities.…”

An inkjet-printed chemical fuse

“…Legislation concerning the permitted levels of chemicals in the atmosphere together with the public awareness of environmental and health issues have made the detection of pollutants a high research priority for scientists and engineers. [1][2][3][4] There are many physical principles upon which sensing systems might be based; changes in electrical resistance (chemiresistors), 5,6 refractive index (fibre optic sensors), 7 and mass (quartz microbalance) 8 have all been exploited. The main challenges in the development of sensors are in the production of cheap, reproducible, and reliable devices with adequate sensitivities and selectivities.…”

A Novel Formaldehyde Gas Sensor Based on Ag-LaFeO₃ Using Molecular Imprinting Technique

“…When formaldehyde is in, the sensor begins to response which takes 55 s and when formaldehyde is out, the sensor begins to recover which takes 40 s. After the sensor has recovered about 90%, it became slower. The reason is when the concentration of formaldehyde on the surface of the materials is very low, the interaction between this part of formaldehyde and sensor is chemisorption[33]; it is very difficult for the formaldehyde to desorb from the surface[34,35]. The response and recovery time are about 55 s and 40 s, respectively.Compare the results with ref [26],.…”