An efficient electrochemical sensor driven by hierarchical hetero-nanostructures consisting of ruo2 nanorods on WO3 nanofibers for detecting biologically relevant molecules

Hyerim Lee, Yeomin Kim, Areum Yu, Dasol Jin, Ara Jo, Youngmi Lee, Myung Hwa Kim, Chongmok Lee

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

By means of electrospinning with the thermal annealing process, we investigate a highly efficient sensing platform driven by a hierarchical hetero-nanostructure for the sensitive detection of biologically relevant molecules, consisting of single crystalline ruthenium dioxide nanorods (RuO2 NRs) directly grown on the surface of electrospun tungsten trioxide nanofibers (WO3 NFs). Electrochemical measurements reveal the enhanced electron transfer kinetics at the prepared RuO2 NRs-WO3 NFs hetero-nanostructures due to the incorporation of conductive RuO2 NRs nanostructures with a high surface area, resulting in improved relevant electrochemical sensing performances for detecting H2O2 and L-ascorbic acid with high sensitivity.

Original languageEnglish
Article number3295
JournalSensors (Switzerland)
Volume19
Issue number15
DOIs
StatePublished - 1 Aug 2019

Bibliographical note

Funding Information:
Nafion-RuO2-AuNP 0.001- flim630000 WereportthesuccessfulfabricationofsinglecrystallineRuO2nanorodsonWO3nanofibersby electrospinning1 and2 calcination.3 Micr4 oscopic5 and spectr6 oscopic measurements such as SEM with EDS, XRD, and XPS were used to characterize the structure and composition of RuO2 NRs-WO3 NFs. The RuO2 NRs-WO3 NFs showed improved electrocatalytic activities over WO3 NFs through a series of4. Conelectrcochemicallusions measurements. In 1 M H2SO4 solution, RuO2 NRs-WO3 NFs represent a higher Csp, 98.15 F g−1, by 103-fold with good stability and a sharper slope than pure WO3 NFs. Additionally, We report the successful fabrication of single crystalline RuO2 nanorods on WO3 nanofibers by the RuO2 NRs-WO3 NFs have dramatically enhanced sensing abilities, in accordance with 224 times electrospinning −1 and−2calcination. Microscopic and spectroscopic measurements−1such−2as SEM with (171.7 µA mM cm ) sensitivity for AA oxidation, and 112 times (619.7 µA mM cm ) sensitivity EDS, XRD, and XPS were used to characterize the structure and composition of RuO2 NRs-WO3 NFs. for H2O2 reduction, respectively, compared to those of pure WO3 NFs. These results thus suggest that The RuO2 NRs-WO3 NFs showed improved electrocatalytic activities over WO3 NFs through a series RuO2 NRs-WO3 NFs could be a promising candidate electrocatalyst for the fabrication of an efficient of electrochemical measurements. In 1 M H2SO4 solution, RuO2 NRs-WO3 NFs represent a higher Csp, electrochemical-1 sensor due to its highly effective electrochemical performance. 98.15 F g , by 103-fold with good stability and a sharper slope than pure WO3 NFs. Additionally, the RuO2 NRs-WO3 NFs have dramatically enhanced sensing abilities, in accordance with 224 times (171.7 μA mM cm ) sensitivity for AA oxidation, and 112 times (619.7 μA mM cm ) sensitivity for H2O2 reduction, respectively, compared to those of pure WO3 NFs. These results thus suggest that RuO2 NRs-WO3 NFs could be a promising candidate electrocatalyst for the fabrication of an efficient D.J.; validation, H.L., A.Y. and D.J.; formal analysis, H.L. and Y.K.; investigation, A.J. and A.Y.; data curation, H.L.electrochemicand A.Y.; writing—originalal sensor due to its highlydraft preparation,effectC.L.,ive elY.ectL. androchemicaM.H.K.;l pewriting—rrformanceviewe. and editing, C.L., Y.L. and M.H.K.; supervision, C.L.; funding acquisition, C.L.,Y.L. and M.H.K. Supplementary Materials: The followings are available online at www.mdpi.com/xxx/s1, Figure S1: EDS Funding: This work was financially supported by Basic Science Research Program through the National elemental mappings, Figure S2: Cyclic voltammograms, Figure S3: Nyquist plots, Figure S4: Amperometric YrLesapnodn2se0.16R1D1A1B03934962 for KMH) and by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2019R1F1A1059969 for CL). Author Contributions: Authors contribute as conceptualization, C.L., Y.L. and M.H.K.; methodology, H.L., Y.K., D.J.; validation, H.L., A.Y. and D.J.; formal analysis, H.L. and Y.K.; investigation, A.J. and A.Y.; data curation,

Funding Information:
This work was financially supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2018R1A6A1A03025340 for YL and 2016R1D1A1B03934962 for KMH) and by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2019R1F1A1059969 for CL).

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Electrochemical sensors
  • Nanofibers
  • Nanorods
  • Ruthenium dioxide
  • Tungsten trioxide

Fingerprint

Dive into the research topics of 'An efficient electrochemical sensor driven by hierarchical hetero-nanostructures consisting of ruo2 nanorods on WO3 nanofibers for detecting biologically relevant molecules'. Together they form a unique fingerprint.

Cite this