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<p>We report a unique approach for producing few-layer graphene from graphite utilizing natural surfactants (Jatropha Curcas and Acacia Concinna) and liquid-phase exfoliation in water. Raman spectroscopy revealed an <i>I</i><sub>D</sub>/<i>I</i><sub>G</sub> ratio of ~2.54 for graphene extracted from Jatropha Carcus (JG) and ~0.79 for graphene extracted from Acacia Concinna (AG), along with a higher number of deconvoluted peaks in the 2D band for AG. These findings suggest a higher number of graphene layers and a lower defect density in the AG sample compared to the JG sample. It is also observed that AG forms a bubbly-graphene morphology. These flakes are further transformed into graphene foam. The AG graphene foam material (AGFM) presents decorated porosity on the melamine base with larger pore diameters (1 to 2 µm), whereas the JG foam material (JGFM) has flake-like morphology&#xa0;on it. These morphological variations impact the produced foams' ability to attenuate sound. A cost-effective smartphone-based setup developed in our laboratory was employed to assess the sound attenuation properties of the synthesized foam materials. Results demonstrate that AGFM effectively attenuates sound (~99%) across a broad frequency spectrum, ranging from 300 to 6000 Hz. Melamine foam material has negligible sound absorption, while JGFM demonstrates noticeable sound absorption at frequencies higher than 2000 Hz (up to 6000 Hz). Our results indicate that AGFM is a good contender for advanced acoustic applications owing to its greater graphene layer thickness and improved porosity, which makes it effective for applications needing better sound attenuation.</p>

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Smartphone-based acoustic attenuation study of eco-synthesized few-layered graphene

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Chinmay C Nayak,
  • Mangababu Akkanaboina,
  • Sweta Gurung,
  • R Sai Prasad Goud,
  • S V S Nageswara Rao,
  • Anand P Pathak,
  • Ajay Tripathi,
  • Archana Tiwari

摘要

We report a unique approach for producing few-layer graphene from graphite utilizing natural surfactants (Jatropha Curcas and Acacia Concinna) and liquid-phase exfoliation in water. Raman spectroscopy revealed an ID/IG ratio of ~2.54 for graphene extracted from Jatropha Carcus (JG) and ~0.79 for graphene extracted from Acacia Concinna (AG), along with a higher number of deconvoluted peaks in the 2D band for AG. These findings suggest a higher number of graphene layers and a lower defect density in the AG sample compared to the JG sample. It is also observed that AG forms a bubbly-graphene morphology. These flakes are further transformed into graphene foam. The AG graphene foam material (AGFM) presents decorated porosity on the melamine base with larger pore diameters (1 to 2 µm), whereas the JG foam material (JGFM) has flake-like morphology on it. These morphological variations impact the produced foams' ability to attenuate sound. A cost-effective smartphone-based setup developed in our laboratory was employed to assess the sound attenuation properties of the synthesized foam materials. Results demonstrate that AGFM effectively attenuates sound (~99%) across a broad frequency spectrum, ranging from 300 to 6000 Hz. Melamine foam material has negligible sound absorption, while JGFM demonstrates noticeable sound absorption at frequencies higher than 2000 Hz (up to 6000 Hz). Our results indicate that AGFM is a good contender for advanced acoustic applications owing to its greater graphene layer thickness and improved porosity, which makes it effective for applications needing better sound attenuation.