Anisotropic nanomaterials composed of two halves with different structure, chemistry, or polarity, known as Janus nanomaterials, have distinct properties compared to symmetrically functionalized analogues and therefore have recently gained a significant amount of interest in many applications such as electronic thin films, drug delivery, sensors, optics, oil/water separation membranes, photoactivated micromotors, photocatalysts, and interfacial modification. In this research, we report a fabrication on 2D Janus graphene nanosheets with pH-triggered switchable amphiphilicity. The amphiphilicity of the Janus nanosheets can be tuned by the pH value in suspension. When the Janus nanosheets is switched off on amphiphilicity at low pH value, their interfacial activity is comparable to that of homogeneous nanoparticles, and when switched on, their interfacial activity is enhanced, demonstrating that the amphiphilicity of Janus nanosheets plays a crucial role in enhancing the interfacial activity.

Fabrication of Janus nanosheets with pH-triggered switchable amphiphilicity for interfacial application

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