| 초록 |
In this study, sensitive quartz tuning fork (QTF) based ethanol sensor was developed using electrospun porous polymethylmethacrylate (PMMA) wire. Porous PMMA wires were formed during electrospinning in high humidity due to phase separation induced by condensed water molecules in the air. Porous PMMA wire was attached between two prongs of QTF. Apparent modulus of porous wire was about half of plain wire which attributed to surface pores and internal cavities. In case of ethanol, porous wire coated QTF exhibited higher sensitivity and faster response time than plain wire coated QTF due to high surface area resulting in greater frequency change. In case of water, porous PMMA wire coated QTF showed almost same frequency change with plain wire coated QTF and the signal was much smaller than that of ethanol which means that this QTF sensor has selectivity to ethanol vapor. This is because the amount of water vapor that PMMA can absorb is less than 8 times that of the ethanol which resulting in faster adsorption and less frequency change than ethanol. |
