Co-porphyrin functionalized CVD graphene ammonia sensor with high selectivity to disturbing gases: hydrogen and humidity
Co-porphyrin functionalized CVD graphene ammonia sensor with high selectivity to disturbing gases: hydrogen and humidity
复制标题
钴卟啉功能化CVD石墨烯氨传感器对干扰气体具有高选择性：氢气和湿度
DOI：
10.35848/1347-4065/ab6b80
复制
发表时间：
2020-02
影响因子：
1.5
通讯作者：
K. Sawada;Takahisa Tanaka;T. Yokoyama;R. Yamachi;Yuki Oka;Yoshinori Chiba;H. Masai;J. Terao;K. Uchida
中科院分区：
文献类型：
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作者：
K. Sawada;Takahisa Tanaka;T. Yokoyama;R. Yamachi;Yuki Oka;Yoshinori Chiba;H. Masai;J. Terao;K. Uchida
近年来，低功耗，小型气体传感器已强烈要求实现“超智能社会”。特别是，氨：NH3传感器有望成为呼吸诊断的关键设备。然而，NH3传感器难以获得对氢气：H2的高选择性，因为常规的金属氧化物气体传感器响应于任何还原气体。本研究制备了钴卟啉功能化石墨烯传感器，利用钴与NH3的选择性金属-配体键实现了对NH3的选择性传感。该传感器成功地检测到亚ppm的NH3，而对高浓度的H2没有反应。此外，我们还研究了湿度对钴卟啉功能化石墨烯NH3传感器的影响。我们证明了即使在快速的湿度变化下也能检测到低浓度的NH3。我们认为，我们的传感器的关键传感机理是电荷转移到石墨烯的钴卟啉-石墨烯复合物的电子结构的变化，由于NH3吸附在钴卟啉。
Recently low-power, small gas sensors have been strongly demanded to realize “super smart society.” In particular, ammonia: NH3 sensors are expected to be key devices for breath diagnosis. However, it is difficult for NH3 sensors to obtain high selectivity against hydrogen: H2, since conventional metal-oxide gas sensors respond to any reducing gases. In this study, Co-porphyrin functionalized graphene sensors were fabricated, and selective NH3 sensing was realized by the selective metal-ligand bond of Co with NH3. The sensor successfully detected sub-ppm NH3, while it showed no response to high concentration H2. Furthermore, we investigated the effect of humidity on the Co-porphyrin functionalized graphene NH3 sensor. We demonstrated the detection of low concentration NH3 even under rapid humidity changes. We considered that the key sensing mechanism of our sensor is charge transfer to graphene by the electronic structure change of Co-porphyrin-graphene complexes due to NH3 adsorption on Co-porphyrin.