Open Access Nano Express

Ion-sensing properties of 1D vanadium pentoxide nanostructures

Nirton CS Vieira1*, Waldir Avansi2, Alessandra Figueiredo1, Caue Ribeiro3, Valmor R Mastelaro1 and Francisco EG Guimarães1

Author Affiliations

1 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

2 Departamento de Físico-Química, Instituto de Química de Araraquara, Universidade Estadual Paulista Júlio de Mesquita Filho, Rua Prof. Francisco Degni 55, Araraquara, São Paulo, CP 355/14801-907, Brazil

3 Embrapa, Empresa Brasileira de Pesquisas Agropecuárias, Rua XV de Novembro 1452, São Carlos, São Paulo, 13560-970, Brazil

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Nanoscale Research Letters 2012, 7:310  doi:10.1186/1556-276X-7-310

Published: 18 June 2012

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.

Keywords:
Vanadium pentoxide; Nanostructures; pH sensors; SEGFET; Hydrothermal synthesis