Li Yuanyuan, Tang Li, Deng Dongmei, He Haibo, Yan Xiaoxia, Wang Jinhua, Luo Liqiang
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China; College of Sciences, Shanghai University, Shanghai 200444, PR China.
College of Sciences, Shanghai University, Shanghai 200444, PR China.
Mater Sci Eng C Mater Biol Appl. 2021 Jan;118:111443. doi: 10.1016/j.msec.2020.111443. Epub 2020 Aug 26.
The construction of metal-oxide heterojunction architecture has greatly widened applications in the fields of optoelectronics, energy conversions and electrochemical sensors. In this study, olive-like hetero-structured MnO-MnO microparticles wrapped by reduced graphene oxide (MnO-MnO@rGO) were synthesized through a facile solvothermal-calcination treatment. The morphology and structure of MnO-MnO@rGO were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction. The as-synthesized MnO-MnO@rGO exhibited prominent catalyzing effect on the electroreduction of HO, due to the combination of good electrical conductivity of rGO and the synergistic effect of MnO and MnO. The MnO-MnO@rGO modified glassy carbon electrode provided a wide linear response from 0.004 to 17 mM, a low detection limit of 0.1 μM, and high sensitivity of 274.15 μA mM cm. The proposed sensor displayed noticeable selectivity and long-term stability. In addition, the biosensor has been successfully applied for detecting HO in tomato sauce with good recovery, revealing its promising potential applications for practical electrochemical sensors.
金属氧化物异质结结构的构建极大地拓宽了其在光电子学、能量转换和电化学传感器领域的应用。在本研究中，通过简便的溶剂热-煅烧处理合成了由还原氧化石墨烯包裹的橄榄状异质结构MnO-MnO微粒（MnO-MnO@rGO）。采用扫描电子显微镜、透射电子显微镜、X射线光电子能谱、拉曼光谱和X射线衍射对MnO-MnO@rGO的形貌和结构进行了表征。由于rGO良好的导电性以及MnO和MnO的协同效应，所合成的MnO-MnO@rGO对HO的电还原表现出显著的催化作用。MnO-MnO@rGO修饰的玻碳电极提供了从0.004到17 mM的宽线性响应、0.1 μM的低检测限以及274.15 μA mM cm的高灵敏度。所提出的传感器显示出显著的选择性和长期稳定性。此外，该生物传感器已成功应用于番茄酱中HO的检测，回收率良好，显示出其在实际电化学传感器中的潜在应用前景。
