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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental and computational studies of the interactions between carbon nanotubes and ionic liquids used for detection of acetaminophen

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Salvador, Michele A. [1] ; Sousa, Camila P. [2] ; Maciel, Cleiton D. [1, 3] ; Gomes, Rayane N. [2] ; Morais, Simone [4] ; de Lima-Neto, Pedro [2] ; Coutinho-Neto, Mauricio D. [1] ; Correia, Adriana N. [2] ; Homem-de-Mello, Paula [1]
Total Authors: 9
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, Bloco B, Sala 1017, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Fed Ceara, Ctr Ciencias, Dept Quim Analit & Fis Quim, Bloco 940, Campus Pici, BR-60440900 Fortaleza, Ceara - Brazil
[3] Inst Fed Educ Ciencia & Tecnol Sao Paulo, Campus Itaquaquecetuba, Ave Primeiro Maio 500, BR-08571050 Itaquaquecetuba, SP - Brazil
[4] Inst Politecn Porto, Inst Super Engn Porto, Rua Dr Bernardino de Almeida 431, P-4200072 Porto - Portugal
Total Affiliations: 4
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 277, p. 640-646, DEC 20 2018.
Web of Science Citations: 1

The interactions between multi-walled carbon nanotubes and different amounts of an ionic liquid (IL), as well as the interactions between this system (used as electrochemical sensor) and acetaminophen (ACOP), were investigated through both experimental and theoretical methodologies. Experiments indicated that there is an optimal concentration of ionic liquid for ACOP detection. A host of techniques and model systems were employed to investigate the adsorption and oxidation processes. To investigate the source of the increased electrochemical current in the presence of an IL, we computed the adsorption energy values of ACOP in the nanotube - IL system via Monte Carlo simulations and Density Functional Theory (DFT). DFT allowed us to explore the changes in adsorption energy due to oxidation. Our theoretical results support the experimental findings that moderate amounts of IL modulates ACOP/ACOP(+) adsorption, pointing to a cooperative effect that tends to wane with increasing amounts of IL pairs. We observed that the IL favors desorption of the oxidized species and facilitates charge transfer from the ACOP to the nanotube. Therefore, our studies point towards multifactorial effects with clear physical basis that modulates binding leading to an optimal ratio to promote ACOP detection. (AU)

FAPESP's process: 17/23416-9 - Photosensitizers: from fundamental properties to biological applications
Grantee:Paula Homem-de-Mello
Support Opportunities: Regular Research Grants