Functionalization of Reduced Graphite Oxide Sheets with a Zwitterionic Surfactant |
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| Authors: | Beatriz Martín‐García Prof M Mercedes Velázquez Dr Francesco Rossella Prof Vittorio Bellani Prof Enrique Diez Prof Jose Luis García Fierro Jose Antonio Pérez‐Hernández Juan Hernández‐Toro Sergi Claramunt Prof Albert Cirera |
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| Institution: | 1. Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Salamanca, Plaza de los Caídos s/n, 37008 Salamanca (Spain), Fax: (+34) 923‐294574;2. Dipartimento di Fisica “A. Volta”, Università di Pavia, 27100 Pavia (Italy);3. Laboratorio de Bajas Temperaturas, Facultad de Ciencias Físicas, Universidad de Salamanca, 37008 Salamanca (Spain);4. Instituto de Catálisis y Petroleoquímica, CSIC, 28049 Cantoblanco, Madrid (Spain);5. Centro de Láseres Pulsados Ultraintensos (CLPU), 37008 Salamanca (Spain);6. Servicio Láser, Universidad de Salamanca, 37008 Salamanca (Spain);7. MIND‐IN2UB, Departament d'Electrònica, Universitat de Barcelona, 08028 Barcelona (Spain) |
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| Abstract: | Films of a few layers in thickness of reduced graphite oxide (RGO) sheets functionalized by the zwitterionic surfactant N‐dodecyl‐N,N‐dimethyl‐3‐ammonio‐1‐propanesulfonate (DDPS) are obtained by using the Langmuir–Blodgett method. The quality of the RGO sheets is checked by analyzing the degrees of reduction and defect repair by means of X‐ray photoelectron spectroscopy, atomic force microscopy (AFM), field‐emission scanning electron microscopy (SEM), micro‐Raman spectroscopy, and electrical conductivity measurements. A modified Hummers method is used to obtain highly oxidized graphite oxide (GO) together with a centrifugation‐based method to improve the quality of GO. The GO samples are reduced by hydrazine or vitamin C. Functionalization of RGO with the zwitterionic surfactant improves the degrees of reduction and defect repair of the two reducing agents and significantly increases the electrical conductivity of paperlike films compared with those prepared from unfunctionalized RGO. |
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| Keywords: | conducting materials graphene graphite oxide Langmuir– Blodgett films surfactants |
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