Journal
SYNTHETIC METALS
Volume 163, Issue -, Pages 19-23Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2012.12.010
Keywords
Polypyrrole; Nanowire network; Drug release system; Conducting polymers
Funding
- National Nature Science Foundation of China [31070845, 31271009, 81271689]
- Fundamental Research Funds for the Central Universities [2011121001]
- Natural Science Foundation of Fujian Province [2011J01331]
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For a conducting polymer (CP) based drug release system, drug loading is often accomplished by a doping process, in which drug is incorporated into polymer as dopant. Therefore, the drug loading capacity is relatively low and the range of drugs can be loaded is limited. In the present work, a polypyrrole (PPy) nanowire network is prepared by an electrochemical method and it is found that the micro- and nano-gaps among the individual nanowires of the PPy nanowire network can be used as reservoir to store drugs. Therefore, the drug loading capacity is dependent on the volume of these micro- and nano-vacancies, instead of the doping level. The range of loaded drugs also can be theoretically extended to any drugs, instead of only charged dopants. In fact, it is confirmed here that both hydrophilic and lipophilic drugs can be loaded into the micro- and nano-gaps due to the amphilicity of the PPy nanowire network. As a result, both drug loading capacity and the range of drugs can be loaded are significantly improved. After being covered with a protective PPy film, controlled drug release from the prepared system is achieved by electrical stimulation (cyclic voltammetry, CV) and the amount of drug released can be controlled by changing the scan rate of CV and the thickness of the protective PPy film. (C) 2012 Elsevier B.V. All rights reserved.
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