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2025 Vol.5, Issue 2 Preview Page

Research Article

Shock Wave-Induced Functional Properties of Lanthanum Cobalt Oxide/Reduced Graphene Oxide Nanocomposites
P. Sivaprakasha#
,
Kiwon Kima#
,
S. A. Martin Britto Dhasa
,
S. Esakki Muthub
,
Jhelai Sahadevanb
,
Ikhyun Kima*
aDepartment of Mechanical Engineering, Keimyung University, Daegu 42601, Korea
bDepartment of Physics, Karpagam Academy of Higher Education, Coimbatore 641021, India
*Corresponding Author
#These authors contributed equally to this work.
30 November 2025. pp. 67-78
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Abstract

The current research and development sectors are concentrating their efforts on developing stable materials for extreme conditions, such as static and dynamic pressure, to survive in challenging conditions. Even under extreme conditions such as high pressure and temperature, materials either retain or modify their physicochemical properties. Here, we prepared the nanocomposite of lanthanum cobalt oxide/reduced graphene oxide (LaCoO3/rGO) and investigated it under dynamic shocked conditions due to its potential method of applying pressure and temperature simultaneously. XRD confirms that the control and shocked materials are hexagonal crystal structures with space group of up R-3c H (167), and a very minor shift has been observed under shocked conditions due to the lattice expansion and it is structurally stable to the shocks. FESEM implies that the spherical particle is slightly fused to 200 shocks due to sudden pressure and temperature. Further, the LA-200 Raman spectrum shows broadened peaks with an elevated baseline, indicating strong disorder, defect formation, and possible oxygen vacancies. FTIR indicates mild shocks preserve the oxide-carbon interface, while higher shocks increase strain and contact. Furthermore, PL analysis shows that shock treatment tunes the defect chemistry and electronic interactions in LaCoO3/rGO, modulating radiative and non-radiative charge transfer depending on the shock intensity. Meanwhile, the composite materials changed from S-shaped soft ferromagnetism to paramagnetic behaviors due to shock-induced spin canting for 200 shocks.

Keywords
Shock wave
Shock tube
Nanocomposites
Paramagnetic
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Information
  • Publisher :The Korean Society of Propulsion Engineers
  • Publisher(Ko) :한국추진공학회
  • Journal Title :Journal of Propulsion and Energy
  • Journal Title(Ko) :Free Open Access International Journal on Propulsion and Energy Science and Technology
  • Volume : 5
  • No :2
  • Pages :67-78
  • Received Date : 2025-10-22
  • Revised Date : 2025-11-12
  • Accepted Date : 2025-11-13
  • DOI :https://doi.org/10.6108/JPNE.2025.5.2.067
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