Spin-coated thin films of copper phthalocyanine (CuPc) were fabricated using different rotation speeds from 250 rpm to 1250 rpm. The structural characterization of these films was analyzed using UV-vis spectroscopy and atomic force microscopy (AFM). Gas sensing properties of these spun thin films were investigated against different volatile organic compounds such as chloroform, dichloromethane and toluene using surface plasmon resonance (SPR) technique. CuPc thin films were found to be highly sensitive to chloroform and dichloromethane vapor with fast response and recovery times. These measurements clearly indicated that the CuPc molecule is a promising material for the development of the room temperature vapor sensing applications with sensitivities between [Formula: see text] and [Formula: see text] percent response ppm[Formula: see text]. Three different functional groups of CuPc structures coded as CuPc I, II and III were investigated which differ from each other in their chemical structures in terms of their microcycle ring groups and peripheral groups, all attached to the same free base porphyrin skeleton. The number of microcycle ring groups and peripheral groups were found to be efficient on the gas sensing properties. The calculated refractive index and extinction coefficients using SPR curves were [Formula: see text] for CuPc I thin film, [Formula: see text] for CuPc II thin film and [Formula: see text] for CuPc III thin film, respectively. For different substrate rotation speeds, the thin film thicknesses vary between 2[Formula: see text]nm and 6[Formula: see text]nm for CuPc I and CuPc III thin films whereas it ranges between 4[Formula: see text]nm and 9[Formula: see text]nm for CuPc II thin film.

中文翻译：

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酞菁铜薄膜的大环和外周基团尺寸依赖性蒸气传感性能

使用从 250 rpm 到 1250 rpm 的不同旋转速度制造了铜酞菁 (CuPc) 的旋涂薄膜。使用紫外-可见光谱和原子力显微镜 (AFM) 分析这些薄膜的结构特征。使用表面等离子共振 (SPR) 技术研究了这些纺成薄膜对不同挥发性有机化合物（如氯仿、二氯甲烷和甲苯）的气体传感特性。发现 CuPc 薄膜对氯仿和二氯甲烷蒸气高度敏感，具有快速响应和恢复时间。这些测量结果清楚地表明，CuPc 分子是一种很有前途的材料，可用于开发室温蒸汽传感应用，其灵敏度介于 [公式：见正文] 和 [公式：见正文] 百分比响应 ppm [公式：见正文]之间。研究了编码为 CuPc I、II 和 III 的三种不同的 CuPc 结构官能团，它们的化学结构在它们的微环环基团和外围基团方面彼此不同，它们都连接到相同的游离碱卟啉骨架上。发现微循环环基团和外围基团的数量对气敏特性有效。使用 SPR 曲线计算的折射率和消光系数对于 CuPc I 薄膜为 [公式：见正文]，对于 CuPc II 薄膜为 [公式：见正文]，对于 CuPc III 薄膜为 [公式：见正文]。对于不同的基板旋转速度，CuPc I 和 CuPc III 薄膜的薄膜厚度在 2[公式：见文本]nm 和 6[公式：见文本]nm 之间变化，而其范围在 4[公式：见文本]nm 和9[公式：