Zeolite based microconcentrators for volatile organic compounds sensing at trace-level: fabrication and performance
| Autor: | Alberto Morales, Ismael Pellejero, M. Pilar Pina, M.A. Urbiztondo, Jesus Santamaria, Fernando Almazan, Javier Sesé |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Resistive touchscreen
Fabrication Materials science business.industry Mechanical Engineering 010401 analytical chemistry Microfluidics Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Adsorption Mechanics of Materials Anodic bonding Desorption Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business Zeolite Microfabrication |
| Zdroj: | Zaguán. Repositorio Digital de la Universidad de Zaragoza instname |
| Popis: | A novel 6-step microfabrication process is proposed in this work to prepare microfluidic devices with integrated zeolite layers. In particular, microfabricated preconcentrators designed for volatile organic compounds (VOC) sensing applications are fully described. The main novelty of this work is the integration of the pure siliceous MFI type zeolite (silicalite-1) polycrystalline layer, i.e. 4.0¿¿±¿¿0.5 µm thick, as active phase, within the microfabrication process just before the anodic bonding step. Following this new procedure, Si microdevices with an excellent distribution of the adsorbent material, integrated resistive heaters and Pyrex caps have been obtained. Firstly, the microconcentrator performance has been assessed by means of the normal hexane breakthrough curves as a function of sampling and desorption flowrates, temperature and micropreconcentrator design. In a step further, the best preconcentrator device has been tested in combination with downstream Si based microcantilevers deployed as VOC detectors. Thus, a preliminar evaluation of the improvement on detection sensitivity by silicalite-1 based microconcentrators is presented. |
| Databáze: | OpenAIRE |
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