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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Effect of heat treatment on the structural and optical characteristics of plasma deposited 2-(diethylamino)ethyl methacrylate thin films by a capacitively coupled glow discharge plasma system
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Effect of heat treatment on the structural and optical characteristics of plasma deposited 2-(diethylamino)ethyl methacrylate thin films by a capacitively coupled glow discharge plasma system

机译：电容耦合辉光放电等离子体系统对等离子体沉积的甲基丙烯酸2-（二乙氨基）乙酯甲基丙烯酸酯薄膜结构和光学特性的影响

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摘要

This paper reports the effect of post-deposition heat treatment on the optical and structural properties of plasma polymerized 2-(diethylamino)ethyl methacrylate (PPDEAEMA) thin films. SEM confirm that both as-deposited and heat treated PPDEAEMA thin films are uniform and pinhole free. Differential thermal analysis and thermogravimetric analysis demonstrate the decomposition and mass loss of PPDEAEMA, respectively, and PPDEAEMA is stable up to 550 K. The Fourier transform infrared spectroscopic investigation indicates the presence of the -CH_2- group in as-deposited PPDEAEMA and heat treated PPDEAMEA. The absorption coefficient, allowed direct transition, E_(qd), and allowed indirect transition, E_(qi), energy gaps were determined from the ultraviolet-visible absorbance spectra and thus the Urbach energy, steepness parameter and extinction coefficient were calculated. E_(qd) and E _(qi) decrease with an increase in thickness and are found to be about 3.25-3.45 and 1.65-1.90 eV, respectively, for as deposited PPDEAEMA thin films of different thicknesses. The effect of heat treatment on the optical properties in relation to structural changes of PPDEAEMA is also discussed. As temperature increases, both E_(qd) and E_(qi) decrease. The Urbach energy E_u of the PPDEAMEA thin films increases with the increase in film thickness and heat treatment temperature. The steepness parameter β decreases with thickness and heat treatment temperature.
机译：本文报道了沉积后热处理对等离子体聚合的甲基丙烯酸2-（二乙氨基）乙酯（PPDEAEMA）薄膜的光学和结构性能的影响。 SEM证实沉积和热处理的PPDEAEMA薄膜均一且无针孔。差示热分析和热重分析分别表明PPDEAEMA的分解和质量损失，并且PPDEAEMA在550 K以下都稳定。傅立叶变换红外光谱研究表明，沉积的PPDEAEMA和热处理的PPDEAMEA中存在-CH_2-基团。 。根据紫外可见吸收光谱确定吸收系数，允许的直接跃迁E_（qd）和允许的间接跃迁E_（qi），能隙，从而计算出Urbach能，陡度参数和消光系数。 E_（qd）和E_（qi）随着厚度的增加而降低，对于不同厚度的沉积PPDEAEMA薄膜，E_（qd）和E_（qi）分别约为3.25-3.45和1.65-1.90 eV。还讨论了热处理对与PPDEAEMA结构变化有关的光学性能的影响。随着温度升高，E_（qd）和E_（qi）均降低。 PPDEAMEA薄膜的Urbach能量E_u随着膜厚度和热处理温度的增加而增加。陡度参数β随着厚度和热处理温度而降低。

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