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Controllable Synthesis of Formaldehyde Modified Manganese Oxide Based on Gas–Liquid Interfacial Reaction and Its Application of Electrochemical Sensing

Bai, Wushuang, Sheng, Qinglin, Nie, Fei, Zheng, Jianbin
ACS Applied Materials & Interfaces 2015 v.7 no.51 pp. 28377-28386
electrochemistry, formaldehyde, hydrogen peroxide, manganese oxides, methodology, sensors (equipment)
Controllable synthesis of manganese oxides was performed via a simple one-step synthetic method. Then obtained manganese oxides which exhibit flower-like, cloud-like, hexagon-like, and rod-like morphologies were modified by formaldehyde based on a simple self-made gas–liquid reaction device respectively and the modified manganese oxides with coral-like, scallop-like and rod-like morphology were synthesized accordingly. The obtained materials were characterized and the formation mechanism was also researched. Then the modified manganese oxides were used to fabricate electrochemical sensors to detect H₂O₂. Comparison of electrochemical properties between three kinds of modified manganese oxides was investigated and the best one has been successfully employed as H₂O₂ sensor which shows a low detection limit of 0.01 μM, high sensitivity of 162.69 μA mM–¹ cm–², and wide linear range of 0.05 μM–12.78 mM. The study provides a new method for controllable synthesis of metal oxides, and electrochemical application of formaldehyde modified manganese oxides will provides a new strategy for electrochemical sensing with high performance, low cost, and simple fabrication.