State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
Nanotechnology. 2010 Feb 5;21(5):055502. doi: 10.1088/0957-4484/21/5/055502. Epub 2009 Dec 21.
A novel humidity sensor was fabricated by electrospinning deposition of nanofibrous polyelectrolyte membranes as sensitive coatings on a quartz crystal microbalance (QCM). The results of sensing experiments indicated that the response of the sensors increased by more than two orders of magnitude with increasing relative humidity (RH) from 6 to 95% at room temperature, exhibiting high sensitivity, and that, in the range of 20-95% RH, the Log(Deltaf) showed good linearity. The sensitivity of fibrous composite polyacrylic acid (PAA)/poly(vinyl alcohol) (PVA) membranes was two times higher than that of the corresponding flat films at 95% RH. Compared with fibrous PAA/PVA membranes, the nanofibrous PAA membranes exhibited remarkably enhanced humidity sensitivity due to their high PAA content and large specific surface area caused by the formation of ultrathin nanowebs among electrospun fibers. Additionally, the resultant sensors exhibited a good reversible behavior and good long term stability.
一种新型湿度传感器是通过静电纺丝沉积纳米纤维聚电解质膜作为敏感涂层在石英晶体微天平(QCM)上制备的。传感实验结果表明，传感器的响应在室温下随着相对湿度（RH）从 6%增加到 95%增加了两个数量级以上，表现出高灵敏度，并且在 20-95%RH 的范围内，Log(Deltaf)显示出良好的线性。在 95%RH 时，纤维复合聚丙烯酸（PAA）/聚乙烯醇（PVA）膜的灵敏度比相应的平面膜高两倍。与纤维 PAA/PVA 膜相比，由于纳米纤维之间形成超薄纳米网，纳米纤维 PAA 膜具有高 PAA 含量和大比表面积，因此表现出显著增强的湿度灵敏度。此外，所得传感器表现出良好的可逆行为和良好的长期稳定性。
