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P. B. A. Fechine

Federal University of Ceara

Rua Papi Júnior 1225 - Rodolfo Teófilo

Fortaleza, 60431970

Portugal

  • Federal University of Ceara

SCHOLARLY PAPERS

7

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191

TOTAL CITATIONS

0

Scholarly Papers (7)

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1.

Multifunctional Sensing of Cobalt Ions and Methylcobalamin Using Doped Carbon Quantum Dots

Number of pages: 41 Posted: 27 May 2025
Carlos Oliveira, Francisco Eduardo Holanda Lima, Gisele Lopes, Wladiana O. Matos, Renato A. Antunes, Thiago Alves Moura, Alexandre Rocha Paschoal, Manoel Neto, Carlos Lenz, Hernandes Faustino de Carvalho, Rafael Freire, Ralph Santos-Oliveira, P. B. A. Fechine and Samuel Carneiro
Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of ABC (UFABC), Federal University of Ceara, Universidade Federal do Ceara, Federal University of Ceara, Federal University of Ceara, affiliation not provided to SSRN, Universidad Central de Chile, affiliation not provided to SSRN, Federal University of Ceara and Federal University of Ceara
Downloads 42 (1,157,785)

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Carbon Quantum Dots, fluorescence, Linear Discriminant Analysis, Methylcobala-min, Spectroscopy.

2.

Non-Chromatographic Inorganic Arsenic Speciation in Rice by Uv/Vis Spectrophotometry Using Silver Nanoparticles as Platform Sensor

Number of pages: 31 Posted: 18 Nov 2024
Wladiana O. Matos, Francisco Eduardo Holanda Lima, Francisco L.F. da Silva, Abdullah Akhdhar, P. B. A. Fechine and Ana Rita de Araujo Nogueira
Federal University of Ceara, Federal University of Ceara, State University of Ceara, University of Jeddah, Federal University of Ceara and Embrapa Southeast Livestock - Grupo de Análise Instrumental Aplicada
Downloads 39 (1,196,171)

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plasmonic nanosensor, Arsenite, Arsenate, non-chromatographic speciation, colorimetry.

3.

Multichannel Differentiation of Trace Elements Based on Carbon Quantum Dots

Number of pages: 24 Posted: 08 Jun 2022
Rafael Melo Freire, A. A. C. Cruz, N. D. G. Souza, J. P. B. de Souza, S. V. Carneiro, Claudenilson S. Clemente, Jeanlex S. Sousa, L. M. U. D. Fechine and P. B. A. Fechine
Instituto Nacional de Investigación Agropecuaria (INIA-Las Brujas), Canelones, Uruguay, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara and Federal University of Ceara
Downloads 37 (1,222,651)

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CQDs, multichannel sensor, trace elements

4.

Vibrational, Optical, Electronic and Electrocatalytic Properties of Srcusi4o10 Ceramic

Number of pages: 43 Posted: 13 Aug 2024
Hilton B. da Silva, Luiz F. Lobato, Raí F. Juca, Francisco G. S. Oliveira, José S. Sarmento, P. B. A. Fechine, A. J. Ramiro de Castro, Alexandre Magno Rodrigues Teixeira, W. Paraguassu, Francisco Ferreira de Sousa, J. M. Soares and Gilberto D. Saraiva
Universidade Estadual do Ceará, affiliation not provided to SSRN, Universidade Estadual do Ceará, Universidade Estadual do Ceará, affiliation not provided to SSRN, Federal University of Ceara, affiliation not provided to SSRN, Universidade Estadual do Ceará, affiliation not provided to SSRN, Federal University of Para, affiliation not provided to SSRN and Universidade Estadual do Ceará
Downloads 22 (1,424,331)

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SrCuSi4O10, Dielectric ceramic, electronic properties, SEM, Raman and IR spectroscopy

5.

Nitrogen and sulfur-doped Carbon Quantum Dots as fluorescent probe for inorganic arsenic sensing in water and seaweed samples

Number of pages: 38 Posted: 28 Jan 2026
Francisco Eduardo Holanda Lima, Carlos Oliveira, André Ferreira, Elayne de Carvalho, Thiago Alves Moura, Alexandre Rocha Paschoal, Renato A. Antunes, Manoel Neto, Carlos Lenz, Hernandes Faustino de Carvalho, Rafael Freire, P. B. A. Fechine, Francisco L.F. da Silva, Samuel Carneiro and Wladiana O. Matos
Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Universidade Federal do Ceara, Federal University of ABC (UFABC), Federal University of Ceara, Federal University of Ceara, affiliation not provided to SSRN, Universidad Central de Chile, Federal University of Ceara, State University of Ceara, Federal University of Ceara and Federal University of Ceara
Downloads 21 (1,470,786)

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Arsenic, Carbon Quantum Dots, Nanomaterials, Fluorescence.

6.

Fluorescent nanocomposite based on Carbon Quantum Dots for the quantification of permanganate ions in aquatic environments

Number of pages: 27 Posted: 16 Apr 2026
Ana Stephani Silva de Lima, Elayne de Carvalho, Carlos Oliveira, João Paulo de Sousa Ferreira, Renato A. Antunes, Thiago Alves Moura, Alexandre Rocha Paschoal, Juan Símon Rodríguez Hernández, Carlos W. A. Paschoal, Alejandro Pedro Ayala, Rafael Freire, P. B. A. Fechine and Samuel Carneiro
Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of ABC (UFABC), Federal University of Ceara, Universidade Federal do Ceara, Universidade Federal do Ceara, Federal University of Ceara, Federal University of Ceara, Universidad Central de Chile, Federal University of Ceara and Federal University of Ceara
Downloads 20 (1,509,872)

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Nanoparticles, Permanganate, Sensing, Fluorescence, Tilapia nurseries

7.

Carbon Quantum Dot-based fluorescent probe for selective detection of dichromate in soil matrices

Number of pages: 28 Posted: 11 May 2026
Vivian Stephanie Ferreira Rodrigues, Elayne de Carvalho, Francisco Eduardo Holanda Lima, Renato A. Antunes, Thiago Alves Moura, Alexandre Rocha Paschoal, Rafael Freire, Wladiana O. Matos, P. B. A. Fechine and Samuel Carneiro
Federal University of Ceara, Federal University of Ceara, Federal University of Ceara, Federal University of ABC (UFABC), Federal University of Ceara, Universidade Federal do Ceara, Universidad Central de Chile, Federal University of Ceara, Federal University of Ceara and Federal University of Ceara
Downloads 10 (1,548,648)

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Carbon quantum dots, sensing platform, fluorescence, hexavalent chromium, soils