SPECTROELECTROCHEMICAL INVESTIGATION OF GOLD NANOPARTICLE PLATFORMS

Vitor Rithery Oliveira Cavalari; Theo Carracedo; Vinícius Matheus Silva Macedo; Rodrigo M. Iost

Todos os Trabalhos

Trabalho

Título do Trabalho

SPECTROELECTROCHEMICAL INVESTIGATION OF GOLD NANOPARTICLE PLATFORMS

Autores

Vitor Rithery Oliveira Cavalari
Theo Carracedo
Vinícius Matheus Silva Macedo
Rodrigo M. Iost

Modalidade

Pôster - resumo

Área temática

Sensores e biossensores

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1458430-spectroelectrochemical-investigation-of-gold-nanoparticle-platforms

ISBN

978-65-272-2467-9

Palavras-Chave

carbon interfaces, gold nanoparticles, SERS, 4-nitrothiophenol

Resumo

Vitor R.O. Cavalari (1,2), Theo Carracedo (1), Vinicius Matheus Silva Macedo (1) and Rodrigo M. Iost (1)* (1) University of São Paulo, Institute of Chemistry, Molecular Spectroscopy Laboratory, São Paulo, Brazil (2) Federal University of São Paulo, Laboratory of Hybrid Materials, Diadema, São Paulo, Brazil e-mail: vitor.rithery@unifesp.br The fundamental relationship between surface chemistry, nanostructured interfaces, and analytical performance in electrochemical surface-enhanced Raman spectroscopy (EC-SERS). The efficiency of EC-SERS using nanostructured carbon materials is largely dictated by surface-related chemical features. Fine control over the interfacial environment allows regulation of molecular binding events and electron-transfer processes at the surface, which directly impact analytical sensitivity and measurement reliability. Here, we examine approaches for tailoring the surface chemistry of carbon nanostructures decorated with gold nanoparticles to improve their behavior in electrochemical SERS system. The present study emphasizes that the efficiency of EC-SERS systems based on nanostructured carbon materials is predominantly governed by surface-related chemical properties. In particular, the interfacial environment between the carbon substrate, the gold nanoparticles with different sizes and morphologies (nanospheres or nanotriangles)[1], and the target analyte plays a decisive role in controlling adsorption behavior and interfacial electron-transfer dynamics. By integrating spectroscopic and electrochemical approaches, the investigation provides insight into how engineered carbon platforms decorated with gold nanoparticles can be optimized for enhanced Raman signal amplification of 4-nitrothiophenol. Fine tuning of surface functionalities enables modulation of molecular binding strength and orientation, which are critical parameters for achieving reproducible and highly sensitive SERS responses. Moreover, the presence of gold nanoparticles introduces localized surface plasmon resonance (LSPR) effects, intensifying the electromagnetic field at the interface and promoting charge-transfer interactions that further enhance Raman scattering signals. The study examines strategies to tailor the chemical environment of carbon nanostructures prior to and after gold nanoparticle deposition. Parameters such as nanoparticle morphology, distribution, and interparticle spacing are considered key determinants of hotspot formation and signal stability. The spectroelectrochemical configuration allows real-time monitoring of redox-active species, enabling correlation between applied potential, molecular transformations, and Raman spectral evolution. Overall, this work establishes a systematic framework for understanding how interfacial engineering influences EC-SERS performance [2]. The insights derived from the spectroelectrochemical investigation contribute to the rational design of advanced nanostructured platforms with improved sensitivity, selectivity, and reproducibility, opening perspectives for applications in chemical sensing, environmental monitoring, and bioelectronic devices. We acknowledge support from CAPES, INEO, CNPQ (402668/2025-1 and 408449/2024-1) and FAPESP (2025/27044-5 and 2025/02150-7). [1] L. Scarabelli and L. M. Liz-Marzán, ACS Nano, 15, 18600, (2021). [2] A. Yadav, R. M. Iost, T. J. Neubert, S. Baylan, T. Schmid and K. Balasubramanian, Chem. Sci., 10, 936–942, (2019).

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

CAVALARI, Vitor Rithery Oliveira et al.. SPECTROELECTROCHEMICAL INVESTIGATION OF GOLD NANOPARTICLE PLATFORMS.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1458430-SPECTROELECTROCHEMICAL-INVESTIGATION-OF-GOLD-NANOPARTICLE-PLATFORMS. Acesso em: 10/08/2026