Comparative Sensibility Study of WO3 ph Sensor Using EGFET and Ciclic Voltammetry

Materials Research

Renata De Castro Campos¹  Dane Tadeu Cestarolli¹  Marcelo Mulato¹  Elidia Maria Guerra¹ 

关键词: tungsten oxide;    pH sensor;    voltammetry;    EGFET;   

DOI  :  10.1590/1516-1439.252513

来源: SciELO

【 摘 要 】

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 WO3.2H2O. From Scanning Electron Microscopy of WO3.2H2O was observed a process corresponding to the delamination which consists of irregular stacking with rounded platelets. The WO3.2H2O 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.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License