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    • One-step synthesis of mesoporous silica–graphene composites by simultaneous hydrothermal coupling and reduction of graphene oxide

      Juliet Q Dalagan Erwin P Enriquez

      Volume 37 Issue 3 May 2014 pp 589-595

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/037/03/0589-0595

    • Keywords

       

      Graphene; graphene oxide; mineral silica; silica; mesoporous silica; hydrothermal reduction.

    • Abstract

       

      Silica–graphene oxide composites were synthesized by hydrothermal method with simultaneous functionalization and reduction of graphene oxide (GO) in the presence of mesoporous silica. Two types of silica were used in the study, mesoporous synthetic silica (MSU-F) synthesized by sol-gel method and mesoporous mineral silica (meso-celite) from pseudomorphic synthesis. The infrared spectra of the composites showed the disappearance of the carboxyl peak at 1735 cm-1 which could be due to the reduction of the –COOH group. The enhancement of the band at 1385 cm-1 is attributed to the vibration of the Si–O–C=O moiety formed by reaction of the –COOH group of GO and the silanol (Si–OH) of silica. The Raman spectra of the composites show a diminished intensity ratio of D to G band indicating that GO was reduced to graphene sheets. The TEM images demonstrate the coupling of silica to GO surface revealing dense loading of silica on GO in planar structure.

    • Author Affiliations

       

      Juliet Q Dalagan1 2 Erwin P Enriquez2

      1. Chemistry Department, Xavier University-Ateneo de Cagayan, Cagayan de Oro City, 9000
      2. Department of Chemistry, Ateneo de Manila University, Loyola Heights, Quezon City, 1108

    • Dates

       
      Published
      May 2014
      Manuscript received
      10 December 2012
      Manuscript revised
      14 February 2013

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