Journal
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
Volume 18, Issue 1, Pages 15-19Publisher
UNIV FED SAO CARLOS, DEPT ENGENHARIA MATERIALS
DOI: 10.1590/1516-1439.252513
Keywords
tungsten oxide; pH sensor; voltammetry; EGFET
Categories
Funding
- FAPESP Brazilian agency
- CNPq Brazilian agency
- INEO Brazilian agency
- FAPEMIG Brazilian agency
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In this present study, the investigation about pH sensorial properties of WO3, via sol-gel, was evaluated by Voltammetry and Extended Gate Field Effect Transistor techniques. The X-ray diffractogram indicates the presence of a lamellar structure, d = 0.69 nm, resulting in WO3 center dot 2H(2)O. From Scanning Electron Microscopy of WO3 center dot 2H(2)O was observed a process corresponding to the delamination which consists of irregular stacking with rounded platelets. The WO3 center dot 2H(2)O was investigated as a pH sensor in the pH range 2-12, by the EGFET and Voltametry techniques presenting a sensitivity of 52 mV/pH and 60 mV/pH, respectively. These results can indicate that both Voltammetry and EGFET techniques present values close to the theoretical limit (59.2 mV/pH) as well as the material is a promising candidate for applications as a pH sensor and as disposable biosensor in the future.
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