3 years ago

Co4N Nanowires: Noble-Metal-Free Peroxidase Mimetic with Excellent Salt- and Temperature-Resistant Abilities

Co4N Nanowires: Noble-Metal-Free Peroxidase Mimetic with Excellent Salt- and Temperature-Resistant Abilities
Yan-Yan Song, Tong-Tong Li, Yu-Zhen Li, Wei Chen
Compared to natural enzymes, nanomaterial-based artificial enzymes have attracted immense attention because of their high stability and cost-effectiveness. In this study, cobalt nitride (Co4N) as a noble-metal-free artificial enzyme exhibiting highly intrinsic peroxidase-like activity and good stability was reported. Kinetic studies revealed that the resultant Co4N nanowires (NWs) exhibited a stronger affinity for 3,3′,5,5′-tetramethylbenzidine (TMB) and H2O2 than HRP. Compared to Co3O4 NWs, Co4N NWs exhibited highly improved catalytic activities, with H2O2 exhibiting an apparent Km approximately 2 orders of magnitude less than that of Co3O4. In particular, the peroxidase-like activity of Co4N was maintained well over a wide range of temperatures and ionic strength. A Co4N-based method was further developed for the detection of glucose with good sensitivity and reliability. Because of advantages such as easy storage, cost-effectiveness, high sensitivity, and outstanding stability, Co4N NWs demonstrate the potential for replacing noble-metal-based peroxidase mimetics in a wide range of promising applications.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b09861

DOI: 10.1021/acsami.7b09861

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