Hybrid nanomaterials of WS or MoS nanosheets with liposomes: biointerfaces and multiplexed drug delivery.

Lipid containing hybrid materials are of significant interest for biointerface research and drug delivery applications, and a large number of previous studies have focused on graphene oxide (GO). In this work, novel hybrid materials made of transition metal dichalcogenides (TMDCs) and phosphocholine (DOPC) liposomes were prepared and compared with GO. All these inorganic materials are 2D nanosheets. DOPC liposomes are adsorbed by tungsten disulfide (WS) as intact liposomes as indicated by cryo-TEM and liposome leakage assays. WS likely uses van der Waals forces for liposome adsorption as determined from urea, salt, and surfactant washing experiments. In addition, WS adsorbed doxorubicin (DOX) and DOPC liposomes synergistically. The adsorption capacity of DOPC on bare WS was 22.5% of the weight of WS. After adsorbing DOX on WS, the liposome adsorption capacity increased to ∼110%. Hydrogen bonding also contributed to liposome adsorption on DOX-loaded WS. Confocal fluorescence microscopy confirmed the uptake of the DOPC/WS hybrid material by HeLa cells, and the co-delivery of DOX and calcein was achieved by loading calcein inside the liposomes. This study provides fundamental insights into the interaction between PC liposomes and WS. Furthermore, preliminary biomedical applications of this hybrid material were explored.