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<p>All methods to synthesize graphene oxide on a large scale utilize a strongly acidic medium. Graphene oxide (GO) to reduced graphene oxide (rGO) conversion, i.e., obtaining widespread sp<sup>2</sup>–sp<sup>2</sup> hybridized carbon allotropes is a laborious and tedious process. Herein, we report an innovative one-step method, through which we fabricate ‘partially oxidized graphene’ on a gram scale directly from graphite powder, without using any acids. The emergence of the (002) XRD peak, band gap (E<sub>g</sub> ~ 1.42 ± 0.01&#xa0;eV), and carbon-to-oxygen (C/O) ratio of 3.67 validate the direct POG phase formation without any reduction step. Raman (I<sub>D</sub>/I<sub>G</sub> ~ 0.80 ± 0.06) and AFM studies reveal the less defective and bi- to few-layer character of POG sheets of thickness ca. 1.59 ± 0.14&#xa0;nm. The measured conductivity of the POG material (9.22 ± 0.04&#xa0;S/cm) is found to be higher than the conductivity of the rGO using the standard method (0.30 ± 0.03&#xa0;S/cm). The zeta potential study suggests a good stability of the POG aqueous dispersion. Furthermore, the proposed method is efficient (2–3&#xa0;h), safe, and renders a higher yield (77%) than many conventional methods (40–70%) for GO preparation. This offers a promising source for conductive electrodes, carbon paste, and more.</p>

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Acid-less direct gram scale exfoliation of graphite to partially oxidized graphene

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月26日

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  • Julfikar Ali Sarkar,
  • Mohd Salman Siddiqui,
  • Mohammed Aslam

摘要

All methods to synthesize graphene oxide on a large scale utilize a strongly acidic medium. Graphene oxide (GO) to reduced graphene oxide (rGO) conversion, i.e., obtaining widespread sp2–sp2 hybridized carbon allotropes is a laborious and tedious process. Herein, we report an innovative one-step method, through which we fabricate ‘partially oxidized graphene’ on a gram scale directly from graphite powder, without using any acids. The emergence of the (002) XRD peak, band gap (Eg ~ 1.42 ± 0.01 eV), and carbon-to-oxygen (C/O) ratio of 3.67 validate the direct POG phase formation without any reduction step. Raman (ID/IG ~ 0.80 ± 0.06) and AFM studies reveal the less defective and bi- to few-layer character of POG sheets of thickness ca. 1.59 ± 0.14 nm. The measured conductivity of the POG material (9.22 ± 0.04 S/cm) is found to be higher than the conductivity of the rGO using the standard method (0.30 ± 0.03 S/cm). The zeta potential study suggests a good stability of the POG aqueous dispersion. Furthermore, the proposed method is efficient (2–3 h), safe, and renders a higher yield (77%) than many conventional methods (40–70%) for GO preparation. This offers a promising source for conductive electrodes, carbon paste, and more.