Carbon dots derived from an aminonaphthalene sulfonic acid as sensitive activated fluorescent probes for chemosensing and imaging applications

Autor(es)

Muniz Jr., W. ; Alves, R. T. ; Braga, L. M. ; Terceiro, P. S. ; Barros, V. P. O. ; Landell, M. F. ; Mastelaro, V. R. ; de Oliveira, I. N.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 469, p. 10-pg., 2025-12-01.

Resumo

The presence of toxic residues in water and food is a constant concern that requires the development of fast and low-cost analytical methods for controlling and monitoring environmental conditions and physicochemical processes. In this context, the current study examines the physical and chemical properties of carbon dots (CD-ANS) produced through hydrothermal synthesis using 5-amino-2-naphthalenesulfonic acid (ANS) as a precursor. Different experimental techniques are used to characterize CD-ANS's shape and photoluminescent properties. Our results show that such carbon dots are co-doped with nitrogen and sulfur, displaying a broad emission spectrum sensitive to small environmental changes. In particular, CD-ANS exhibits an activated fluorescence in the presence of certain organic pollutants, thus being suitable for various chemosensing applications, including ratiometric sensing of pH, methanol, and a carbamate pesticide (methomyl). Thermal effects on the nanoparticle's photoluminescence are also analyzed, where the occurrence of a thermally-activated mechanism is identified. The possibility of using CD-ANS in staining yeast cells has also been investigated. These findings suggest that the carbon dots derived from ANS can be a versatile fluorescent platform for various physical, chemical, and biological applications. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 14/50983-3 - INCT 2014: fluidos complexos
• Beneficiário: Antonio Martins Figueiredo Neto
• Modalidade de apoio: Auxílio à Pesquisa - Temático