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Recently,the mixed monolayer-protected Au nanoparticles(MPANs)have received much attention due to their potential applications in biosensing,catalysis,drug delivery,and molecular recognition,since more desired properties of mixed MPANs can be achieved not only by varying the size of Au core and ligand length but also by changing the composition and relative position of mixed ligands.A comprehensive understanding of the physical and chemical properties of mixed MPANs is significantly favorable to design and synthesize various MPANs with tailored properties.One of the most crucial properties is the structure and dynamics of hydrogen-bond(HB)network in the hydration layer of mixed MPANs,which play an important role in determining the interfacial properties of functionalized nanomaterials.