PMMA、PMMA- pva和PMMA-(PVAAg)纳米复合材料自支撑膜在大湿度范围内的高线性响应研究

Poonam D. Mahapure, R. Aiyer, S. Gosavi, P.V. Adhyapaka, D. P. Amalnerkara
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引用次数: 2

摘要

以聚甲基丙烯酸甲酯(PMMA)为自支撑膜,包覆聚乙烯醇(PVA)和(在PVA中非原位掺杂Ag粒子)为材料,制备了具有优化PMMA厚度的Ag/PVA纳米复合材料作为相对湿度(RH)传感器。PMMA薄膜,当使用直接光学传输测试相对湿度传感时,在80-92% RH范围内给出响应。为了增加响应范围,将亲水性较高的PVA一层一层地自旋涂覆在PMMA上。结果表明,PMMA上的第4层PVA覆盖了较宽的感应范围(2-92%RH),有三个不同的感应区域。为了在整个相对湿度传感范围内实现线性,将Ag颗粒添加到PVA中,并涂覆在PMMA上。这导致线性响应(1.85 mv/%RH),在较宽的RH范围内(2-95%)。Ag与PVA体积比为5∶2时线性良好(R2 > 0.99),响应时间为15秒,恢复时间为18秒,滞后率为4%,重复性好。(测试超过7个周期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Studies on self supported film of PMMA, PMMA-PVA and PMMA-(PVAAg) nano composite for highly linear response over wide range of humidity
A novel combination of Poly methyl methacrylate (PMMA) as a self supported film, coated with poly vinyl alcohol (PVA) and (Ex-situ doped Ag particles in PVA) Ag/PVA nanocomposite with optimized thickness of PMMA is fabricated as a Relative Humidity (RH) sensor. A film of PMMA, when tested for relative humidity sensing using direct optical transmission gives response in the range 80–92% RH. To increase the range of response, PVA, higher hydrophilic, was spin coated on PMMA, layer by layer. It was found that with the 4th layer of PVA over PMMA, wide sensing range (2–92%RH) is covered, with three distinct regions of sensitivity. To achieve linearity over the complete relative humidity sensing range, Ag particles were added in PVA, and coated on PMMA. This resulted in linear response (1.85 mv/%RH), over a wide range of RH (2–95%). The concentration of Ag, having 5∶2 by volume of PVA and Ag gives good linearity (R2 > 0.99) with response and recovery time of 15 and 18 sec respectively with 4% hysteresis and good repeatability.(tested over 7cycles.
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