Separation of surfactant functionalized single-walled carbon nanotubes via free solution electrophoresis method

Central European Journal of Physics (Impact Factor: 1.09). 04/2011; 9(2):325-329. DOI: 10.2478/s11534-010-0083-z


This work presents the application of the free solution electrophoresis method (FSE) in the metallic / semiconductive (M/S)
separation process of the surfactant functionalized single-walled carbon nanotubes (SWCNTs). The SWCNTs synthesized via laser
ablation were purified through high vacuum annealing and subsequent refluxing processes in aqua regia solution. The purified
and annealed material was divided into six batches. First three batches were dispersed in anionic surfactants: sodium dodecyl
sulfate (SDS), sodium cholate (SC) and sodium deoxycholate (DOC). The next three batches were dispersed in cationic surfactants:
cetrimonium bromide (CTAB), benzalkonium chloride (BKC) and cetylpyridinium chloride (CPC). All the prepared SWCNTs samples
were subjected to FSE separation process. The fractionated samples were recovered from control and electrode areas and annealed
in order to remove the adsorbed surfactants on carbon nanotubes (CNTs) surface. The changes of the van Hove singularities
(vHS) present in SWCNTs spectra were investigated via UV-Vis-NIR optical absorption spectroscopy (OAS).


Download full-text


Available from: Ryszard Jozef Kalenczuk, Nov 25, 2015
    • "CNT cleanup approaches can vary depending on the initial method of synthesis. Separation of metallic and semi-conductive CNTs can be done through selective functionalization (Maeda et al., 2008), selective destruction by electrical heating (Collins et al., 2001), or separation by density gradient ultracentrifugation (Lipscomb et al., 2011), among others (Scheibe et al., 2011). To decrease bundle formation, CNTs can be functionalized with chemical groups or suspended in a surfactant containing solution (Guldi et al., 2003). "
    [Show abstract] [Hide abstract]
    ABSTRACT: Carbon allotropes such as graphene and carbon nanotubes, have been incorporated in electrochemical biosensors for highly sensitive and selective detection of various analytes. The superior physical and electrical properties like high carrier mobility, ambipolar electric field effect, high surface area, flexibility and their compatibility with microfabrication techniques makes these carbon nanomaterials easy to integrate in field-effect transistor (FET)/chemiresistor type configuration which is suitable for portable and point-of-use/field-deployable sensors. This review covers the synthesis of carbon nanostructures (graphene and CNTs) and their integration into devices using various fabrication methods. Finally, we discuss the recent reports showing different sensing platforms that incorporate biomolecules like enzymes, antibodies and aptamers as recognition elements for fabrication of simple, low cost, compact biosensors that can be used for on-site, rapid environmental monitoring of environmental pollutants like pathogens, heavy metals, pesticides and explosives. Copyright © 2015 Elsevier Ltd. All rights reserved.
    No preview · Article · May 2015 · Chemosphere
  • [Show abstract] [Hide abstract]
    ABSTRACT: This review is a general overview on detn. and anal. of nanoparticles by capillary electrophoresis and dielectrophoresis, focusing on the different strategies carried out to facilitate the detn. of nanoparticles of different sorts. The target analyte may be the nanoparticle itself or a deriv. of the nanoparticle. Different approaches were carried out to improve electrophoretic resoln., such as functionalization of nanoparticles and use of gels or surfactants, since nanoparticles must be sol., charged, and stable in the background electrolyte under the electrophoretic conditions.
    No preview · Chapter · Dec 2012
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper describes techniques for rapidly producing a carbon nanotube thin film by electrophoretic deposition at room temperature and determines the film mass density and electrical/mechanical properties of such films. The mechanism of electrophoretic deposition of thin layers is explained with experimental data. Also, film thickness is measured as a function of time, electrical field and suspension concentration. We use Rutherford backscattering spectroscopy to determine the film mass density. Films created in this manner have a resistivity of 2.14×10- 3 Ω∙cm, a mass density that varies with thickness from 0.12 to 0.54 g/cm3, and a Young’s modulus between 4.72 and 5.67 GPa. The latter was found to be independent of thickness from 77 to 134 nm. We also report on fabricating free-standing films by removing the metal seed layer under the CNT film, and selectively etching a sacrificial layer. This method could be extended to flexible photovoltaic devices or high frequency RF MEMS devices.
    No preview · Article · May 2015 · Thin Solid Films