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It is well known that 3,3′,5,5′-tetramethylbenzidine (TMB) can be oxidized into blue or yellow oxidzed TMB (oxTMB) with the catalysis of peroxidase or mimetic enzyme of platinum nanoparticles (Pt NPs). In this work, we found that TMB could be oxidized into very stable black oxTMB with the catalysis of Pt NPs under certain chromogenic reaction conditions. For the first time, the black oxTMB was revealed...
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