Study of Charge Transfer Contribution to Surface-Enhanced Raman Scattering Activity of Cu\(_2\)O Nano-octahedral Substrate

Thu Trang Tran; Xuan Hoa Vu; Thi Thu Ha Pham; Trong Nghia Nguyen; Dac Dien Nguyen

doi:10.15625/0868-3166/16787

Author affiliations

Authors

Thu Trang Tran Institute of Science and Technology, TNU-University of Sciences, Tan Thinh ward, Thai Nguyen city, Vietnam
Xuan Hoa Vu Institute of Science and Technology, TNU-University of Sciences, Tan Thinh ward, Thai Nguyen city, Vietnam
Thi Thu Ha Pham TNU- University of Sciences
Trong Nghia Nguyen Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
Dac Dien Nguyen Faculty of Occupational Safety and Health, Vietnam Trade Union University, 169 Tay Son, Dong Da, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/0868-3166/16787

Keywords:

SERS, charge transfer contribution, octahedral Cu2O nanocrystals

Abstract

In this study, a surface-enhanced Raman scattering (SERS) substrate based on an octahedral cuprous oxide (Cu₂O) nanostructure to probe methylene blue (MB) molecules as an analyte chemical has been implemented. Octahedral Cu₂O nanocrystals were synthesized by a novel hydrothermal process using only ethylene glycol as both a reductant and organic solvent. The characteristics of Cu₂O nanocrystals were well recognized by scanning electron microscope (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), FTIR, and Raman spectroscopy. The mechanism of the SERS surface has been thoroughly investigated and has been shown to involve the contributions of both surface plasmon resonance and charge transfer effects. Using a simple collection rule for SERS bands, the portion of charge transfer processes was estimated to be about 46%.

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