▎ 摘　　要

The aim of current study was to develop a pH-responsive controlled release system of a cancer drug (5-fluorouracil) by the use of a planar nanohybrid to reduce the dosing frequency and consequently improve the patient compliance. This nanohybrid was developed by taking advantage of graphene oxide sheets as a support and poly (ethyleneimine) and tannic acid as materials to encapsulate the drug molecules. The release rates of this cancer drug molecule from the nanohybrid were significantly sensitive to the existence of H+ ions in the environmental solution (74% in pH = 5.8 and 59% in pH = 7.4). In phosphate buffered saline solution, the release of 5-fluorouracil from the nanohybrid was fast in the earliest time but stayed steady after few hours. The degradation experiments revealed that the collapse of this nanohybrid is drastic in pH = 5.8 during 10 days.