The present invention relates to a biopolymer-modified nanocarrier in which chitosan is bound to a water-soluble biocompatible polymer that has been crosslinked via a photo-crosslinkable functional group; wherein the chitosan-modified nanocarrier has a diameter which changes in accordance with changes in temperature, has enhanced skin permeability or cellular uptake and selective delivery to cancer tissue as compared with a bare nanocarrier to which chitosan has not been bound, and exhibits characteristics that are advantageous in photothermal therapy. The chitosan-modified nanocarrier of the present invention exhibits highly superior efficacy as a transdermal carrier, since the skin permeability is enhanced to a significant level as compared with a bare nanocarrier that has no chitosan. The chitosan-modified nanocarrier of the present invention can be advantageous in the imaging and photothermal therapy of tumour cells and cancer cells, since the cellular uptake by tumour cells and cancer cells is substantially improved.
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