Bimetallic AuCu nanoparticles coupled with multi-walled carbon nanotubes as ion-to-electron transducers in solid-contact potentiometric sensors

Yueling Liu, Yang Liu, Rui Yan, Yingying Gao, Ping Wang

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Abstract

This work reports the first implementation of potentiometric solid-contact ion-selective electrodes (SC-ISEs) using the nanocomposite of ordered bimetallic AuCu nanoparticles coupled with multi-walled carbon nanotubes (oAuCuNPs-MWCNTs) as transducers. The unexplored nanocomposite oAuCuNPs-MWCNTs is deposited by solvent casting on gold sputtered copper electrodes as an intermediate layer and then covered with ion-selective membranes to form potentiometric sensors. The performance of the sensors is evaluated by determining Ca2+ and SO4 2− as an example of cation and anion, respectively. The obtained electrodes show response slopes of 29.0 mV/decade for Ca2+-selective SC-ISEs from 10−6 to 10−1 M, and −27.0 mV/decade for SO4 2--selective SC-ISEs from 10−5 to 10−1 M. Moreover, they exhibit high double layer capacitance (54 μF for Ca2+-selective SC-ISEs and 105 μF for SO4 2--selective SC-ISEs), fast charge transfer (resistance of 2.22 MΩ for Ca2+-selective SC-ISEs and 0.46 MΩ for SO4 2--selective SC-ISEs) and low potential drift (15 ± 3 μV/h for Ca2+-selective SC-ISEs and 118 ± 16 μV/h for SO4 2--selective SC-ISEs over 12 h). Additionally, none of the redox reactions, light interference and water films is observed. These results indicate that the combination of bimetallic nanoparticles and carbon nanomaterials offers great promise for the development of more robust and useful electrochemical sensors.

Original languageEnglish (US)
Article number135370
JournalElectrochimica Acta
Volume331
DOIs
StatePublished - Jan 20 2020
Externally publishedYes

Bibliographical note

Funding Information:
This work was financially supported by National Natural Science Foundation of China (Grants 21804043 , 21636003 ), Shanghai Sailing Program (Grant 18YF1405800 ) and the Fundamental Research Funds for the Central Universities of East China University of Science and Technology (Grant 222201814034 ). Yueling Liu is currently a lecturer in the School of Biotechnology at East China University of Science and Technology (China). She earned his PhD in Chemistry at Nanjing University of China in 2015. Her research interests include the carrier based electrochemical and optical sensors. Yang Liu is currently an undergraduate student in the School of Biotechnology at East China University of Science and Technology (China). She received the BS degree from Shandong Agricultural University (China) in 2016. Her research experiences include the carrier based electrochemical sensors. Rui Yan is currently an undergraduate student in the School of Biotechnology at East China University of Science and Technology (China). She received the BS degree from Northeast Agricultural University in 2018. Her research experiences include the ionophore based nano-optodes. Yingying Gao is currently an undergraduate student in the School of Biotechnology at East China University of Science and Technology (China). She received the BS degree from Shandong University of Science and Technology in 2017. Her research experiences include the development of new electrochemical and biological sensors. Ping Wang is currently a distinguished professor in the School of Biotechnology at East China University of Science and Technology (China). His research interests include the electrochemical sensors and biocatalytic sensors.

Funding Information:
This work was financially supported by National Natural Science Foundation of China (Grants 21804043, 21636003), Shanghai Sailing Program (Grant 18YF1405800) and the Fundamental Research Funds for the Central Universities of East China University of Science and Technology (Grant 222201814034).

Keywords

  • Bimetallic AuCu nanoparticles
  • Multi-walled carbon nanotubes
  • Nanocomposite
  • Solid-contact ion-selective electrode
  • Transducer

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