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Characterization of Functionalized Multiwalled Carbon Nanotubes for Use in an Enzymatic Sensor

  • Leonor Guadarrama-Fernández (a1), Jorge Chanona-Pérez (a1), Arturo Manzo-Robledo (a2), Georgina Calderón-Domínguez (a1), Adrián Martínez-Rivas (a3), Jaime Ortiz-López (a4) and Jorge Roberto Vargas-García (a5)...

Abstract

Carbon nanotubes (CNT) have proven to be materials with great potential for the construction of biosensors. Development of fast, simple, and low cost biosensors to follow reactions in bioprocesses, or to detect food contaminants such as toxins, chemical compounds, and microorganisms, is presently an important research topic. This report includes microscopy and spectroscopy to characterize raw and chemically modified multiwall carbon nanotubes (MWCNTs) synthesized by chemical vapor deposition with the intention of using them as the active transducer in bioprocessing sensors. MWCNT were simultaneously purified and functionalized by an acid mixture involving HNO3–H2SO4 and amyloglucosidase attached onto the chemically modified MWCNT surface. A 49.0% decrease in its enzymatic activity was observed. Raw, purified, and enzyme-modified MWCNTs were analyzed by scanning and transmission electron microscopy and Raman and X-ray photoelectron spectroscopy. These studies confirmed purification and functionalization of the CNTs. Finally, cyclic voltammetry electrochemistry was used for electrical characterization of CNTs, which showed promising results that can be useful for construction of electrochemical biosensors applied to biological areas.

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*Corresponding author. jorge_chanona@hotmail.com

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