Preparation and self-assembly of chitosan/carbon microsphere composite

Abstract

Carbon-based films were synthesized by self-assembly of chitosan-encapsulated carbon microsphere (CMS@CS) composite. First, carbon microspheres (CMSs) prepared by chemical vapor deposition were modified by HNO₃ and H₂O₂. Second, oxidized CMSs were modified by chitosan (CS). Finally, CMS@CS was self-assembled by vertical deposition, in which suspension concentration and deposition temperature on the quality of self-assembling film were investigated. Field emission scanning electron microscopy, atomic force microscopy, X-ray diffraction, thermogravimetry, and Fourier transformation infrared spectrometry were employed to characterize the morphology and structure of the samples. The results show that CMSs modified by CS had uniform particle size and good dispersion, CMS@CS was self-assembled into a dense film, the film thickened with increasing suspension concentration at fixed temperature, and more ordered film was obtained at 1 wt% of suspension concentration and 50 °C. The ultraviolet-visible absorption spectra show that the absorbance of CMS@CS film grew steadily with increasing suspension concentration and that the CMSs with oxygen-containing groups have a good assembling performance to form composite films with CS.

Keywords

carbon film / carbon microspheres / chitosan / vertical deposition / self-assembly

References

[1] Liao J. X., Liu W. M., Xu T., . Characteristics of Carbon Films Prepared by Plasma-based Ion Implantation [J]. Carbon, 2004, 42(2): 387-393.

[2] Chen J. S., Sun Z., Lau S. P., . Structural and Tribological Properties of Hard Carbon Film Synthesized by Heat-treatment of a Polymer on Graphite Substrate [J]. Thin Solid Films, 2001, 389(1–2): 161-166.

[3] Bao T., Morrison P. W. Jr, Woyczynski W. A. Parametric Optimization of Microhardness of Diamond-like Carbon Films Prepared by Plasma Enhanced Chemical Vapor Deposition [J]. Thin Solid Films, 2005, 485(1–2): 27-41.

[4] Zhang J. L., Yang F., Zheng W. J., . Self-assembly Monolayers and Their Characterization [J]. Prog. Chem., 2005, 17(2): 203-208.

[5] Mi Y. Z., Liu Y. L., Yuan D.S., . Preparation of Carbon Micro-beads via an Ethanol-thermal Route [J]. Chem. Lett., 2005, 34(6): 846-847.

[6] Liu X. G., Yang Y. Z., Lin X., . Deoiled Asphalt as Carbon Source for Preparation of Various Carbon Materials by Chemical Vapor Deposition [J]. Fuel. Process. Technol., 2006, 87(10): 919-925.

[7] Yang Y. Z., Liu X. G., Zhang C. Y., . Controllable Synthesis and Modification of Carbon Micro-spheres from Deoiled Asphalt [J]. J. Phys. Chem. Solids, 2010, 71(3): 235-241.

[8] Wang J. Carbon Nanotube Based Electrochemical Biosensors: A Review[J]. Electroanal., 2005, 17(1): 7-14.

[9] Mathias B., Christopher J. K. Some Recent Advances in Nanostructure Preparation from Gold and Silver Particles: A Short Topical Review [J]. Colloid. Surface A, 2002, 202(2–3): 175-186.

[10] Zeng D. F., Wu J. J., Kennedy J. F. Application of a Chitosan Flocculant to Water Treatment [J]. Carbohyd. Polym., 2008, 71(1): 135-139.

[11] Portney N. G., Ozkan M. Nano-oncology: Drug Delivery, Imaging, and Sensing [J]. Anal. Bioanal. Chem., 2006, 384(3): 620-630.

[12] Fu D. W., Yan Y. H. Degradation Performance of Biological Barrier Membrane [J]. Journal of Wuhan University of Technology, 2005, 27(10): 26-29.

[13] Li X. B., Jiang X. Y. Electrostatic Layer-by-layer Assembled Multilayer Films of Chitosan and Carbon Nanotubes [J]. New Carbon Materials, 2010, 25(3): 237-240.