Sysoev Vitalii I, Bulavskiy Mikhail O, Pinakov Dmitry V, Chekhova Galina N, Asanov Igor P, Gevko Pavel N, Bulusheva Lyubov G, Okotrub Alexander V
Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia.
Faculty of Natural Sciences, Novosibirsk State University, 2 Pirogova Str., 630090 Novosibirsk, Russia.
Materials (Basel). 2020 Aug 11;13(16):3538. doi: 10.3390/ma13163538.
The electrical conductivity of graphene materials is strongly sensitive to the surface adsorbates, which makes them an excellent platform for the development of gas sensor devices. Functionalization of the surface of graphene opens up the possibility of adjusting the sensor to a target molecule. Here, we investigated the sensor properties of fluorinated graphene films towards exposure to low concentrations of nitrogen dioxide NO. The films were produced by liquid-phase exfoliation of fluorinated graphite samples with a composition of CF, CF, and CF Fluorination of graphite using a BrF/Br mixture at room temperature resulted in the covalent attachment of fluorine to basal carbon atoms, which was confirmed by X-ray photoelectron and Raman spectroscopies. Depending on the fluorination degree, the graphite powders had a different dispersion ability in toluene, which affected an average lateral size and thickness of the flakes. The films obtained from fluorinated graphite CF showed the highest relative response ca. 43% towards 100 ppm NO and the best recovery ca. 37% at room temperature.
石墨烯材料的电导率对表面吸附物非常敏感，这使其成为开发气体传感器设备的理想平台。石墨烯表面功能化开启了将传感器调整至目标分子的可能性。在此，我们研究了氟化石墨烯薄膜在暴露于低浓度二氧化氮（NO₂）时的传感器特性。这些薄膜是通过液相剥离含CF、CF₂和CF₃成分的氟化石墨样品制备而成。在室温下使用BrF₃/Br混合物对石墨进行氟化，导致氟共价连接到基面碳原子上，这通过X射线光电子能谱和拉曼光谱得以证实。根据氟化程度，石墨粉末在甲苯中的分散能力不同，这影响了薄片的平均横向尺寸和厚度。由氟化石墨CF₃制备的薄膜对100 ppm NO₂显示出约43%的最高相对响应，并且在室温下具有约37%的最佳恢复率。
