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Surface Nano/micro Functionalization Of Pmma Thin Films By 157 Nm irradiation For Sensing Applications

机译：157 Nm辐照对Pmma薄膜进行表面纳米/微功能化，用于传感应用

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摘要

Laser irradiation at 157 nm of polymethylmethacrylate (PMMA) thin films induces major variations of polymer film thicknesses from sorption (absorption/desorption) of methanol and ethanol analytes in the gas phase as much as 400%, in comparison to the film thickness variation of the non-irradiated areas. The structural changes of irradiated areas involve scission of polymeric chains, cross-linking and formation of new bonds. In addition, 157 nm induces surface and volume morphological changes in the nano/micro domain, with different shapes, depending on the irradiation conditions. The reversibility of the sorption processes suggests that the polymer swelling has its origin at the tendency of the system to increase its volume during sorption. The internal forces from sorption are higher than the weak dipole interactions between the polymer and the analytes and they are amplified following 157 nm irradiation. A simple qualitative model explains adequately the experimental results. 157 nm laser treatment forms the basis to engineer a novel class of polymer sensor arrays with enhanced detection efficiency of liquid/gas analytes.
机译：与气相色谱法的膜厚变化相比，在气相中甲醇和乙醇分析物的吸附（吸收/解吸）在157 nm处的聚甲基丙烯酸甲酯（PMMA）薄膜激光辐照引起聚合物膜厚的主要变化。非辐照区域。辐照区域的结构变化涉及聚合物链的断裂，交联和新键的形成。此外，157 nm会在纳米/微域中引起表面和体积形态变化，其形状取决于辐照条件。吸附过程的可逆性表明，聚合物溶胀起源于系统在吸附过程中增加其体积的趋势。来自吸附的内力高于聚合物与分析物之间的弱偶极相互作用，并且在157 nm辐射后会被放大。一个简单的定性模型可以充分说明实验结果。 157 nm激光处理是设计新型聚合物传感器阵列的基础，该传感器阵列可提高对液体/气体分析物的检测效率。

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