TY - JOUR
T1 - Modification of electrodes with N-and S-doped carbon dots. Evaluation of the electrochemical response
AU - Bonet-San-Emeterio, Marta
AU - Algarra, Manuel
AU - Petković, Marijana
AU - del Valle, Manel
N1 - Funding Information:
The authors thank to the project CTQ2016-80170-P (MINECO, Spain). This work was also supported by FCT-Funda??o para a Ci?ncia e a Tecnologia through the CQM Base Fund - UIDB/00674/2020, and Programmatic Fund - UIDP/00674/2020, and by ARDITI-Ag?ncia Regional para o Desenvolvimento da Investiga??o Tecnologia e Inova??o, through the project M1420-01-0145-FEDER-000005 - Centro de Qu?mica da Madeira - CQM+ (Madeira 14?20 Program). MdV thanks the support from program ICREA Academia. MBSE thanks to la Secretaria d'Universitats i Recerca del Departament d'Empreses i Coneixement de la Generalitat de Catalunya and to European Social Fund, European Union for a FI fellowship.
Funding Information:
The authors thank to the project CTQ2016-80170-P (MINECO, Spain). This work was also supported by FCT- Fundação para a Ciência e a Tecnologia through the CQM Base Fund - UIDB/00674/2020 , and Programmatic Fund - UIDP/00674/2020 , and by ARDITI- Agência Regional para o Desenvolvimento da Investigação Tecnologia e Inovação , through the project M1420-01-0145-FEDER-000005 - Centro de Química da Madeira - CQM+ (Madeira 14–20 Program). MdV thanks the support from program ICREA Academia. MBSE thanks to la Secretaria d’Universitats i Recerca del Departament d’Empreses i Coneixement de la Generalitat de Catalunya and to European Social Fund, European Union for a FI fellowship.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/5/15
Y1 - 2020/5/15
N2 - Nitrogen and sulphur-doped Carbons Dots (N-CDs and S-CDs) were synthesized by a hydrothermal method and incorporated as surface electrode modifiers to evaluate their properties for electrochemical sensing. The first task was to characterize the synthesized materials, for which different spectroscopies, scanning microscopes, mass spectrometry and elementary analysis were performed. Next, a glassy carbon electrode (GCE) was surface-modified with the doped CDs and applied to check the electrochemical signal of different organic compounds corresponding to different families. Water solubility of the doped carbon dots forced us to incorporate them in a graphite-polystyrene ink to complete the modification of electrodes. This modification needed a first activation to obtain a properly conductive surface. The organic compounds examined were salicylic acid, cysteine and ascorbic acid. The modified GCEs exhibited an enhanced sensitivity, probably caused by the increase of active surface, but in addition, signals of salicylic acid were shifted ca. 200 mV to lower potentials, what is a proof of the increase of the heterogeneous electron transfer rate, and a demonstration of an enhanced catalytic response.
AB - Nitrogen and sulphur-doped Carbons Dots (N-CDs and S-CDs) were synthesized by a hydrothermal method and incorporated as surface electrode modifiers to evaluate their properties for electrochemical sensing. The first task was to characterize the synthesized materials, for which different spectroscopies, scanning microscopes, mass spectrometry and elementary analysis were performed. Next, a glassy carbon electrode (GCE) was surface-modified with the doped CDs and applied to check the electrochemical signal of different organic compounds corresponding to different families. Water solubility of the doped carbon dots forced us to incorporate them in a graphite-polystyrene ink to complete the modification of electrodes. This modification needed a first activation to obtain a properly conductive surface. The organic compounds examined were salicylic acid, cysteine and ascorbic acid. The modified GCEs exhibited an enhanced sensitivity, probably caused by the increase of active surface, but in addition, signals of salicylic acid were shifted ca. 200 mV to lower potentials, what is a proof of the increase of the heterogeneous electron transfer rate, and a demonstration of an enhanced catalytic response.
KW - Electrochemical sensor
KW - Modified electrode
KW - N-doped carbon dots
KW - Nanomaterial
KW - S-doped carbon dots
KW - Voltammetry
UR - http://www.scopus.com/inward/record.url?scp=85079089977&partnerID=8YFLogxK
M3 - Article
C2 - 32113568
AN - SCOPUS:85079089977
VL - 212
JO - Talanta
JF - Talanta
SN - 0039-9140
M1 - 120806
ER -