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Ion-sensing properties of 1D vanadium pentoxide nanostructures.

Vieira NC, Avansi W, Figueiredo A, Ribeiro C, Mastelaro VR, Guimarães FE - Nanoscale Res Lett (2012)

Bottom Line: The application of one-dimensional (1D) V2O5·nH2O nanostructures as pH sensing material was evaluated. 1D V2O5·nH2O nanostructures were obtained by a hydrothermal method with systematic control of morphology forming different nanostructures: nanoribbons, nanowires and nanorods.Deposited onto Au-covered substrates, 1D V2O5·nH2O nanostructures were employed as gate material in pH sensors based on separative extended gate FET as an alternative to provide FET isolation from the chemical environment. 1D V2O5·nH2O nanostructures showed pH sensitivity around the expected theoretical value.Due to high pH sensing properties, flexibility and low cost, further applications of 1D V2O5·nH2O nanostructures comprise enzyme FET-based biosensors using immobilized enzymes.

View Article: PubMed Central - HTML - PubMed

Affiliation: Departamento de Física e Ciências dos Materiais, Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, São Carlos, São Paulo, CP 369/13560-970, Brazil. nirton@ursa.ifsc.usp.br.

ABSTRACT
The application of one-dimensional (1D) V2O5·nH2O nanostructures as pH sensing material was evaluated. 1D V2O5·nH2O nanostructures were obtained by a hydrothermal method with systematic control of morphology forming different nanostructures: nanoribbons, nanowires and nanorods. Deposited onto Au-covered substrates, 1D V2O5·nH2O nanostructures were employed as gate material in pH sensors based on separative extended gate FET as an alternative to provide FET isolation from the chemical environment. 1D V2O5·nH2O nanostructures showed pH sensitivity around the expected theoretical value. Due to high pH sensing properties, flexibility and low cost, further applications of 1D V2O5·nH2O nanostructures comprise enzyme FET-based biosensors using immobilized enzymes.

No MeSH data available.


Dynamic response of all 1D V2O5·nH2O nanostructures to pH variations. (a) Typical dynamic response of 1D V2O5·nH2O nanostructured sensing membranes to variations in pH and (b) pH sensitivity calculated at 3 min. Inset: pH sensitivity of 1D V2O5·nH2O nanostructures as a function of hydrothermal synthesis temperature.
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Figure 4: Dynamic response of all 1D V2O5·nH2O nanostructures to pH variations. (a) Typical dynamic response of 1D V2O5·nH2O nanostructured sensing membranes to variations in pH and (b) pH sensitivity calculated at 3 min. Inset: pH sensitivity of 1D V2O5·nH2O nanostructures as a function of hydrothermal synthesis temperature.

Mentions: The 1D V2O5·nH2O nanostructures deposited on Au-coated substrates were immersed in buffer solutions with different pH (pH from 2 to 12), and the output voltage of the operational amplifier was recorded over time. Figure 4a shows the dynamic response of all 1D V2O5·nH2O nanostructures to pH variations. Despite the structural changes due to the conditions of hydrothermal synthesis, the V2O5·nH2O synthesized at 160°C (in nanoribbon form with monoclinic phase) and at 180°C (in nanowire form with orthorhombic phase) yielded similar results. The pH sensitivity of the 1D V2O5·nH2O nanostructures was determined based on the output voltage at 3 min. Within the limits of experimental error, the sensitivity did not change in any of the V2O5·nH2O morphologies, indicating that the pH sensitivity is independent of the phase or nanostructure, as indicated in the inset in Figure 4b.


Ion-sensing properties of 1D vanadium pentoxide nanostructures.

Vieira NC, Avansi W, Figueiredo A, Ribeiro C, Mastelaro VR, Guimarães FE - Nanoscale Res Lett (2012)

Dynamic response of all 1D V2O5·nH2O nanostructures to pH variations. (a) Typical dynamic response of 1D V2O5·nH2O nanostructured sensing membranes to variations in pH and (b) pH sensitivity calculated at 3 min. Inset: pH sensitivity of 1D V2O5·nH2O nanostructures as a function of hydrothermal synthesis temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475107&req=5

Figure 4: Dynamic response of all 1D V2O5·nH2O nanostructures to pH variations. (a) Typical dynamic response of 1D V2O5·nH2O nanostructured sensing membranes to variations in pH and (b) pH sensitivity calculated at 3 min. Inset: pH sensitivity of 1D V2O5·nH2O nanostructures as a function of hydrothermal synthesis temperature.
Mentions: The 1D V2O5·nH2O nanostructures deposited on Au-coated substrates were immersed in buffer solutions with different pH (pH from 2 to 12), and the output voltage of the operational amplifier was recorded over time. Figure 4a shows the dynamic response of all 1D V2O5·nH2O nanostructures to pH variations. Despite the structural changes due to the conditions of hydrothermal synthesis, the V2O5·nH2O synthesized at 160°C (in nanoribbon form with monoclinic phase) and at 180°C (in nanowire form with orthorhombic phase) yielded similar results. The pH sensitivity of the 1D V2O5·nH2O nanostructures was determined based on the output voltage at 3 min. Within the limits of experimental error, the sensitivity did not change in any of the V2O5·nH2O morphologies, indicating that the pH sensitivity is independent of the phase or nanostructure, as indicated in the inset in Figure 4b.

Bottom Line: The application of one-dimensional (1D) V2O5·nH2O nanostructures as pH sensing material was evaluated. 1D V2O5·nH2O nanostructures were obtained by a hydrothermal method with systematic control of morphology forming different nanostructures: nanoribbons, nanowires and nanorods.Deposited onto Au-covered substrates, 1D V2O5·nH2O nanostructures were employed as gate material in pH sensors based on separative extended gate FET as an alternative to provide FET isolation from the chemical environment. 1D V2O5·nH2O nanostructures showed pH sensitivity around the expected theoretical value.Due to high pH sensing properties, flexibility and low cost, further applications of 1D V2O5·nH2O nanostructures comprise enzyme FET-based biosensors using immobilized enzymes.

View Article: PubMed Central - HTML - PubMed

Affiliation: Departamento de Física e Ciências dos Materiais, Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, São Carlos, São Paulo, CP 369/13560-970, Brazil. nirton@ursa.ifsc.usp.br.

ABSTRACT
The application of one-dimensional (1D) V2O5·nH2O nanostructures as pH sensing material was evaluated. 1D V2O5·nH2O nanostructures were obtained by a hydrothermal method with systematic control of morphology forming different nanostructures: nanoribbons, nanowires and nanorods. Deposited onto Au-covered substrates, 1D V2O5·nH2O nanostructures were employed as gate material in pH sensors based on separative extended gate FET as an alternative to provide FET isolation from the chemical environment. 1D V2O5·nH2O nanostructures showed pH sensitivity around the expected theoretical value. Due to high pH sensing properties, flexibility and low cost, further applications of 1D V2O5·nH2O nanostructures comprise enzyme FET-based biosensors using immobilized enzymes.

No MeSH data available.