Non-destructive integration of spark-discharge produced gold nanoparticles onto laser-scribed graphene electrodes for advanced electrochemical sensing applications

Shetty, Saptami Suresh and Rizalputri, Lavita Nuraviana and Trachioti, Maria G. and Yuvaraja, Saravanan and Mani, Veerappan and Prodromidis, Mamas I. and Salama, Khaled Nabil (2024) Non-destructive integration of spark-discharge produced gold nanoparticles onto laser-scribed graphene electrodes for advanced electrochemical sensing applications. Surfaces and Interfaces, 55. 105362. ISSN 2468-0230 (https://doi.org/10.1016/j.surfin.2024.105362)

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Abstract

Gold nanoparticles (AuNPs) decorated graphene materials are preferable materials in a wide range of electrochemical applications, however, the current methods for preparing them have several limitations. Herein, we have developed a green, solution-free, and non-destructive method for the in-situ generation of AuNPs on laser-scribed graphene electrodes (LSGEs), addressing the limitations of traditional preparation methods. This novel technique, contrasting with the conventional solution-based electrochemical deposition, utilizes spark discharge to modify LSGEs, demonstrating superior performance in sensors and biosensors applications. Through comprehensive characterizations (scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Raman spectra, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Kelvin probe force microscopy (KPFM)), we observed significant distinctions in particle size, metal loading, stability, surface-to-volume ratio, and graphene quality between spark-discharge produced AuNPs (SP-AuNPs) and electrodeposition produced AuNPs (EC-AuNPs). The average particle sizes of the SP-AuNPs and EC-AuNPs are 10 nm and 38 nm, respectively. The SP-AuNPs modified LSGEs demonstrate exceptional electroanalytical performance in dopamine detection, with a broad detection range (0.6–90 µM) and low LOD (0.40 µM), further validated in human neuroblastoma cells SH-SY5Y. Our findings suggest that the spark discharge method represents a significant advancement in the synthesis of metal nanoparticle enhanced LSG electrodes, with broad implications for electrochemical sensing, biosensing, and biomedical applications.

ORCID iDs

Shetty, Saptami Suresh, Rizalputri, Lavita Nuraviana, Trachioti, Maria G., Yuvaraja, Saravanan, Mani, Veerappan ORCID logoORCID: https://orcid.org/0000-0002-0756-7398, Prodromidis, Mamas I. and Salama, Khaled Nabil;
CORE (COnnecting REpositories)