A novel material synthesized by intercalating CrO₃ in the multilayer graphene was used for the fabrication of reversible ammonia (NH₃) gas sensor based on resistive transduction mechanism. Electron diffraction and X-ray diffraction revealed the formation of partial stage-2 CrO₃ intercalated graphene. High resolution transmission micrographs showed the increase in the interlayer distances in graphene after intercalating CrO₃ layers between graphene layers. Energy dispersive X-ray spectroscopy confirmed the presence of chromium and oxygen in the graphene layers. Current voltage studies using conducting atomic force microscopy showed the formation of junction between graphene and CrO₃. Rapid and reversible sensing was observed when the CrO₃-intercalated material was kept at 180°. Sensor film demonstrated sensing response of 22.5% and 44% for 20 ppm and 50 ppm of NH₃ at 180 °C. It took ∼10 sec for sensing NH₃ gas and ∼20 sec for recovery on removal of gas. Reversible charge transfer between NH₃ and electron deficient graphene connected to chromium trioxide at high temperature is proposed to be responsible for high selectivity and sensitivity of the intercalated material towards ammonia gas. The intercalated material showed >8 months stability and sensing ability.

通过在多层石墨烯中嵌入CrO ₃合成了一种新型材料，用于基于电阻转导机制的可逆性氨（NH ₃）气体传感器的制造。电子衍射和X射线衍射揭示了部分阶段的2CrO ₃插层石墨烯的形成。高分辨率透射显微照片显示，在石墨烯层之间插入CrO ₃层后，石墨烯的层间距离增加。能量色散X射线光谱证实了石墨烯层中铬和氧的存在。使用导电原子力显微镜的当前电压研究表明，石墨烯与CrO ₃之间形成结。当插入CrO _3的材料保持在180°时，观察到快速且可逆的感测。传感器膜在180°C下对20 ppm和50 ppm的NH ₃表现出22.5％和44％的感测响应。感测NH ₃气体大约需要10秒，而去除气体后大约需要20秒。提出了在高温下连接到三氧化铬的NH ₃和缺电子的石墨烯之间可逆电荷转移的原因，是插层材料对氨气的高选择性和敏感性。插入的材料显示> 8个月的稳定性和感测能力。