Enhanced NO2 Sensing at Room Temperature with Graphene via Monodisperse Polystyrene Bead Decoration
Enhanced NO2 Sensing at Room Temperature with Graphene via Monodisperse Polystyrene Bead Decoration
复制标题
通过单分散聚苯乙烯珠装饰，用石墨烯增强室温下的 NO2 传感
DOI：
10.1021/acsomega.8b03540
复制
发表时间：
2019-02-01
期刊：
影响因子：
4.1
通讯作者：
Wu, Han-Chun
中科院分区：
文献类型：
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作者：
Fei, Haifeng;Wu, Gang;Wu, Han-Chun
石墨烯是单层碳原子，具有大的表面积与体积比，提供了大容量的气体分子吸附和强的表面灵敏度。化学气相沉积生长的石墨烯基NO2气体传感器通常具有从十亿分之100（ppb）到百万分之几（ppm）的检测限，响应时间超过1000秒。已经提出了许多方法来增强石墨烯的NO2传感能力。其中，用金属颗粒和金属氧化物颗粒进行表面修饰已被证明具有提高气敏性能的潜力。在这里，我们表明，NO2传感的石墨烯也可以通过装饰单分散聚合物珠增强。在黑暗条件下，检测限提高到45 ppb的聚苯乙烯（PS）珠的应用后。用激光照射，检测限为0.5 ppb。增强的气体传感是由于表面等离子体激元激发的干扰和PS珠之间的电荷转移。该方法为石墨烯在气体传感中的应用开辟了一条有趣的路线。
Graphene is a single layer of carbon atoms with a large surface-to-volume ratio, providing a large capacity gas molecule adsorption and a strong surface sensitivity. Chemical vapor deposition-grown graphene-based NO2 gas sensors typically have detection limits from 100 parts per billion (ppb) to a few parts per million (ppm), with response times over 1000 s. Numerous methods have been proposed to enhance the NO2 sensing ability of graphenes. Among them, surface decoration with metal particles and metal-oxide particles has demonstrated the potential to enhance the gas-sensing properties. Here, we show that the NO2 sensing of graphene can be also enhanced via decoration with monodisperse polymer beads. In dark conditions, the detection limit is improved from 1000 to 45 ppb after the application of polystyrene (PS) beads. With laser illumination, a detection limit of 0.5 ppb is determined. The enhanced gas sensing is due to surface plasmon polaritons excited by interference and charge transfer between the PS beads. This method opens an interesting route for the application of graphene in gas sensing.