Abstract Nickel manganate nanorod (NNM) decorated reduced graphene oxide (NNMG) was developed and its structure-property correlations in light of X-ray diffraction (XRD), Raman, field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) were evaluated. The starring role of NNM and reduced graphene oxide (RGO) in NNMG for CO sensing was explored and an insight into the mechanistic pathway of sensing was proposed. NNMG displayed an excellent response % (∼ 7000) and sensitivity (0.60 ppm−1), which can surpass most stable efficient sensors, indicative of the synergistic effect of RGO and NNM. Moreover, NNMG can competently sense CO gas at wide range of concentration (25–200 ppm) with good stability and reversibility. Ligand like approach of CO facilitated donation of electron to the lattice oxygen vacancy and subsequently decrease electron barrier at the Schottky junction, resulting the higher response. The obtained outcomes demonstrated that the rational design of nanorod decorated RGO could be a promising strategy to improve CO sensing performance.

中文翻译：

---

对由锰酸镍纳米棒修饰的还原氧化石墨烯开发的一氧化碳气体传感器高响应的机理洞察

摘要 根据 X 射线衍射 (XRD)、拉曼、场发射扫描电子显微镜 (FE-SEM)、透射电子显微镜，开发了锰酸镍纳米棒 (NNM) 装饰的还原氧化石墨烯 (NNMG) 及其结构-性质相关性。 (TEM)、原子力显微镜 (AFM)、X 射线光电子能谱 (XPS) 进行了评估。探讨了 NNM 和还原氧化石墨烯 (RGO) 在用于 CO 传感的 NNMG 中的主要作用，并提出了对传感机制途径的见解。NNMG 显示出出色的响应 % (∼ 7000) 和灵敏度 (0.60 ppm-1)，可以超越大多数稳定的高效传感器，表明 RGO 和 NNM 的协同效应。此外，NNMG 可以在很宽的浓度范围内（25-200 ppm）胜任检测 CO 气体，并且具有良好的稳定性和可逆性。CO的配体样方法促进了电子向晶格氧空位的捐赠，随后降低了肖特基结处的电子势垒，从而导致更高的响应。获得的结果表明，纳米棒装饰的 RGO 的合理设计可能是提高 CO 传感性能的有前途的策略。