A novel gas sensor composed of electrospun nanofibrous membranes (FM) and quartz crystal microbalance (QCM) was successfully fabricated. The electrospun nanofibers can be deposited on the electrode of QCM by electrospinning the homogenous blend solutions of cross-linkable poly (acrylic acid) (PAA) and poly (vinyl alcohol) (PVA). Moreover, the PAA fibrous membranes with different morphology can be deposited on the electrode of QCM by electrospinning the PAA solutions with various solvent composition of H2O and ethanol. Sensing experiments were examined by measuring the resonance frequency shifts of QCM which due to the additional mass loading. The results showed that the sensing properties were mainly affected by the content of PAA component in nanofibrous membranes, morphology of the fibrous membranes, concentration of NH3, and relative humidity. Additionally, the sensitivity of FM coated QCM (FM-QCM) sensor was much higher than that of continuous films coated QCM (CF-QCM) sensor. Furthermore, the PAA FM-QCM sensors exhibited high sensitivity towards low concentration of ammonia, as low as 130 ppb at the relative humidity of 40%. The pre-sorbed water in fibrous membranes was proved to be the key factor to affect the sensitivity of FM-QCM sensors for ammonia.
|出版ステータス||Published - 2004 12月 1|
|イベント||IEEE Sensors 2004 - Vienna, Austria|
継続期間: 2004 10月 24 → 2004 10月 27
|Other||IEEE Sensors 2004|
|Period||04/10/24 → 04/10/27|
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