Ion-sensing properties of 1D vanadium pentoxide nanostructures

Nirton Cs Vieira,Francisco Eg Guimarães,Waldir Avansi,Valmor R Mastelaro,Caue Ribeiro,Alessandra Figueiredo

doi:10.1186/1556-276x-7-310

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.

Highlights

Proton donor-acceptor property is characteristic of several metal oxides or nitrides. These properties have enabled the development of numerous devices to measure ion activities in chemical environments, including ion-sensitive field-effect transistors (ISFET) [1], capacitive electrolyte-insulator-semiconductors [2], light-addressable potentiometric sensors [3], and separative extended gate field-effect transistors (SEGFET) [4]
Combining SEGFET devices and V2O5ÁnH2O nanostructures, field-effect sensors can be constructed in a simple and low-cost way. In this context of technological applications, we report on the use of 1D V2O5ÁnH2O nanostructures obtained by a hydrothermal method as pH sensitive membranes in a SEGFET device, which was constructed based on van der Spiegel’s concept [5]
The bright field scanning transmission electron microscopy (STEM) images shown in Figure 3 confirm the morphology of the resulting nanostructures

Summary

Background

Proton donor-acceptor property (amphoterism) is characteristic of several metal oxides or nitrides These properties have enabled the development of numerous devices to measure ion activities in chemical environments, including ion-sensitive field-effect transistors (ISFET) [1], capacitive electrolyte-insulator-semiconductors [2], light-addressable potentiometric sensors [3], and separative extended gate field-effect transistors (SEGFET) [4]. Combining SEGFET devices and V2O5ÁnH2O nanostructures, field-effect sensors can be constructed in a simple and low-cost way In this context of technological applications, we report on the use of 1D V2O5ÁnH2O nanostructures obtained by a hydrothermal method as pH sensitive membranes in a SEGFET device, which was constructed based on van der Spiegel’s concept [5]

Methods

Results and discussion

Conclusions

Bergveld P