Facile preparation of high-concentration aqueous MnO₂ nanosheets for efficient enzyme immobilization

A facile SDS-mediated redox strategy enables rapid synthesis of MnO₂ nanosheets within 5 min. The resulting nanosheets can be readily redispersed in water to form stable high-concentration aqueous dispersions up to 3.4 mg mL^-1, serving as efficient carriers for halohydrin dehalogenase immobilization toward asymmetric synthesis of (S)-epichlorohydrin.