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<p>This research reports the synthesis of graphene oxide (GO), reduced graphene oxide (rGO), and composites of zirconium dioxide with rGO (ZrO<sub>2</sub>/rGO) using a microwave-assisted, plant-mediated green synthesis approach. Plant extract of <i>Ocimum tenuiflorum</i> (<i>OT</i>) and <i>Azadirachta indica</i> (<i>AI</i>). The synthesized materials were systematically characterized for their morphological, vibrational, optical, structural, and electrochemical characteristics. XRD analysis confirmed structural modifications upon reduction: the interlayer spacing (d) decreased from 0.85&#xa0;nm in GO to 0.60&#xa0;nm in <i>AI</i>-derived rGO (NR) and 0.726&#xa0;nm in <i>OT</i>-derived rGO (TR), while crystallite size (D) reduced from 7.477&#xa0;nm (GO) to 1.289&#xa0;nm (NR) and 3.690&#xa0;nm (TR). For the composites, <i>OT-</i>derived ZrO<sub>2</sub>/rGO (T-ZR) exhibited a D of 0.499&#xa0;nm, which is smaller than <i>AI-</i>derived ZrO<sub>2</sub>/rGO (N-ZR. 0.547&#xa0;nm. Comparative cyclic voltammetry (CV) analysis has demonstrated specific capacitance (<i>C</i><sub><i>S</i></sub>) for the N-ZR (756.63 Fg<sup>− 1</sup>) compared to N-ZR (251.83 Fg<sup>− 1</sup>) and pristine GO (2.95 Fg<sup>− 1</sup>) at a scan rate of 5 mVs<sup>− 1</sup>.</p>

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Microwave-assisted green synthesis of graphene derivatives and their composites with zirconium dioxide: structural, optical and electrochemical characterization

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Suveksha Tamang,
  • Gunja Prasad,
  • Joydeep Biswas,
  • Nayan Kamal Bhattacharyya

摘要

This research reports the synthesis of graphene oxide (GO), reduced graphene oxide (rGO), and composites of zirconium dioxide with rGO (ZrO2/rGO) using a microwave-assisted, plant-mediated green synthesis approach. Plant extract of Ocimum tenuiflorum (OT) and Azadirachta indica (AI). The synthesized materials were systematically characterized for their morphological, vibrational, optical, structural, and electrochemical characteristics. XRD analysis confirmed structural modifications upon reduction: the interlayer spacing (d) decreased from 0.85 nm in GO to 0.60 nm in AI-derived rGO (NR) and 0.726 nm in OT-derived rGO (TR), while crystallite size (D) reduced from 7.477 nm (GO) to 1.289 nm (NR) and 3.690 nm (TR). For the composites, OT-derived ZrO2/rGO (T-ZR) exhibited a D of 0.499 nm, which is smaller than AI-derived ZrO2/rGO (N-ZR. 0.547 nm. Comparative cyclic voltammetry (CV) analysis has demonstrated specific capacitance (CS) for the N-ZR (756.63 Fg− 1) compared to N-ZR (251.83 Fg− 1) and pristine GO (2.95 Fg− 1) at a scan rate of 5 mVs− 1.