Polymer/TaS2 layered nanocomposites have been synthesized by using the exfoliation-adsorption technique. Single crystals of layered transition-metal dichalcogenides of 1T-TaS2, 2H-TaS2, and 4Hb-TaS2 were used as host materials. Poly(ethylene oxide) (PEO) and poly(ethylenimine) (PEI) were adopted as guest intercalants. As the exfoliation-adsorption method may require complicated procedures, optimum conditions to synthesize nanocomposites were estimated for each set of TaS2 polytypes and polymers. They have been characterized by powder X-ray diffraction (XRD) and electrical dc resistivity measurements. XRD patterns showed that all samples of the polymer/TaS2 layered nanocomposites contain organic polymer between all individual TaS2 sheets. Although 1T-, 2H-, and 4Hb-TaS2 polytypes are well known to show quite different temperature dependences of resistivity, the resistivities of all nanocomposites show similar temperature dependences.
Polymer/MX2 layered nanocomposites containing organic polymers between the inorganic sheets of the host lattice have been synthesized by using the exfoliation-adsorption method. The temperature dependences of the electrical resistivities of polymer/MX2 nanocomposites down to 10 K were characterized. Electron transfer in PEI/MoS2 nanocomposite showed the three-dimensional variable rang hopping, while polymer/1T-TaS2 nanocomposites showed semiconductor-like behavior, but which was found to be different from the standard variable range hopping model.
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