Plasmon-Enhanced Copper Nanodendrites as Dual-Function SERS Substrates and Photoelectrochemical H2O2 Sensors
- 1Department of Chemical Engineering and Biotechnology, , No. 1, Sec. 3, Zhongxiao E. Road, Taipei 10608, Taiwan
- 2Department of Opto-Electronic Engineering, , No. 1, Sec. 2, Da Hsueh Road, Shoufeng, Hualien 97401, Taiwan
Abstract
A facile, one-step galvanic replacement route was used to grow hierarchical copper nanodendrites (Cu NDs) directly on aluminum (Al) foil, providing a dual-function plasmonic platform for surface-enhanced Raman scattering (SERS) and enzyme-free photoelectrochemical (PEC) detection of hydrogen peroxide (H2O2). The Cu NDs were formed by immersing Al foil in an acidified CuSO4 solution at room temperature, and their fern-leaf morphology, phase purity, and metallic Cu(0) oxidation state were confirmed by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Using 4-mercaptobenzoic acid (4-MBA) as a probe molecule, the Cu NDs/Al foil substrate achieved SERS detection down to 10−7 M with an approximate enhancement factor of ~106, consistent with strong localized surface plasmon resonance (LSPR)-driven electromagnetic enhancement. Under simulated solar illumination, LSPR-excited hot carriers additionally accelerated the electrocatalytic reduction of H2O2, raising the detection sensitivity from 110.6 to 145.3 μA cm−2 mM−1 relative to dark conditions. Wavelength- and intensity-dependent photocurrent measurements confirmed that this enhancement tracks the LSPR absorption band of the Cu NDs rather than photothermal heating. These results establish low-cost, earth-abundant Cu nanodendrites as an effective plasmonic platform for combined optical and electrochemical (bio)sensing.
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BibTeX
@article{chen2026plasmonenhanced,
title = {{Plasmon-Enhanced Copper Nanodendrites as Dual-Function SERS Substrates and Photoelectrochemical H2O2 Sensors}},
author = {Ying-Chu Chen and Cing-Jhen Shih and Yu-Kuei Hsu},
journal = {Nanomaterials (Basel, Switzerland)},
year = {2026},
month = oct,
doi = {10.3390/nano16191269},
url = {https://europepmc.org/article/PMC/PMC13666979},
note = {CC BY},
}
RIS
TY - JOUR
TI - Plasmon-Enhanced Copper Nanodendrites as Dual-Function SERS Substrates and Photoelectrochemical H2O2 Sensors
AU - Ying-Chu Chen
AU - Cing-Jhen Shih
AU - Yu-Kuei Hsu
PY - 2026
DA - 2026/10/01
JO - Nanomaterials (Basel, Switzerland)
DO - 10.3390/nano16191269
UR - https://europepmc.org/article/PMC/PMC13666979
AB - A facile, one-step galvanic replacement route was used to grow hierarchical copper nanodendrites (Cu NDs) directly on aluminum (Al) foil, providing a dual-function plasmonic platform for surface-enhanced Raman scattering (SERS) and enzyme-free photoelectrochemical (PEC) detection of hydrogen peroxide (H2O2). The Cu NDs were formed by immersing Al foil in an acidified CuSO4 solution at room temperature, and their fern-leaf morphology, phase purity, and metallic Cu(0) oxidation state were confirmed by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Using 4-mercaptobenzoic acid (4-MBA) as a probe molecule, the Cu NDs/Al foil substrate achieved SERS detection down to 10−7 M with an approximate enhancement factor of ~106, consistent with strong localized surface plasmon resonance (LSPR)-driven electromagnetic enhancement. Under simulated solar illumination, LSPR-excited hot carriers additionally accelerated the electrocatalytic reduction of H2O2, raising the detection sensitivity from 110.6 to 145.3 μA cm−2 mM−1 relative to dark conditions. Wavelength- and intensity-dependent photocurrent measurements confirmed that this enhancement tracks the LSPR absorption band of the Cu NDs rather than photothermal heating. These results establish low-cost, earth-abundant Cu nanodendrites as an effective plasmonic platform for combined optical and electrochemical (bio)sensing.
SN - 2079-4991
ER -