In this study, pre-synthesized 5,10,15-tri(4-tert-butylphenyl)-20-(4-phenol)-porphyrin (Por) was incorporated with graphene oxide (GO) via ultrasonication and, as a result, GO–Por was obtained. Morphological and structural characterizations of GO–Por were performed using scanning electron microscopy, Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy, demonstrating that the porphyrin derivative was attached to GO. The resulting GO–Por composite was utilized as the modifier for the construction of a carbon felt based electrochemical catechol sensor. The GO–Por modified sensor exhibited a nearly 10-fold increment in the oxidation peak current accompanying a 31 mV negative shift in the oxidation potential as compared with the unmodified sensor. A linear response in the range of 5–250 μM catechol with a limit of detection of 0.063 μM (n = 3) was obtained with the proposed method. The GO–Por modified carbon felt sensor was also applied for catechol detection in tap water samples and very satisfactory recovery values were obtained.

中文翻译：

---

氧化石墨烯-卟啉复合纳米结构包括用于邻苯二酚检测的电化学传感器

在这项研究中，预先合成的5,10,15-三（4-叔丁基苯基）-20-（4-苯酚）-卟啉（Por）通过氧化石墨烯（GO）掺入超声处理，从而获得了GO-Por。GO-Por的形态和结构表征使用扫描电子显微镜，傅立叶变换红外光谱和紫外可见光谱进行，表明卟啉衍生物已附着在GO上。所得的GO-Por复合材料被用作改性剂，用于构建基于碳毡的电化学邻苯二酚传感器。与未经修饰的传感器相比，GO-Por修饰的传感器在氧化峰电流上表现出近10倍的增加，同时伴随着31 mV的氧化电位负移。儿茶酚在5-250μM范围内的线性响应，检出限为0.063μM（n= 3）是通过提出的方法获得的。GO-Por改性碳毡传感器也用于自来水样品中的邻苯二酚检测，并获得了非常令人满意的回收率。