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In this communication, we proposed an azoreductase activatable, endonuclease-gated fluorescent nanodevice for spatiotemporal amplification imaging of microRNA-21 in hypoxic tumor cells.

Metallic zinc is regarded as an ideal anode material for high-energy aqueous zinc ion batteries owing to its high theoretical capacity, low cost, and abundant resource. However, the undesirable dendrite formation and side reactions occurring on Zn anode during the long-term cycling process seriously restrict the electrochemical performance of the device. Herein, 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP) is used as electrolyte additive to release the chemical corrosion and hydrogen evolution occurring on Zn anode based on the absorption of HEDP on the Zn foil. Moreover, the strong coordination of HEDP with Zn

Via the assembly of 4-mercaptophenylboronic ester on the gold nanorod's surface, a novel ratiometric SERS nanosensor for H2O2 imaging in living cells or cancer tissues has been developed in the present study.