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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Well-established materials in microelectronic devices systems for differential-mode extended-gate field effect transistor chemical sensors

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Pedroza Dias Mello, Hugo Jose Nogueira [1] ; Mulato, Marcelo [1]
Total Authors: 2
[1] Univ Sao Paulo, Dept Phys, Fac Philosophy Sci & Letters Ribeirao Preto, Ave Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: MICROELECTRONIC ENGINEERING; v. 160, p. 73-80, JUL 1 2016.
Web of Science Citations: 5

Well-established materials commonly used in microfabrication industry were studied as chemical sensing elements of extended gate field effect transistor (EGFET) chemical sensors. Microelectronic components were used in the differential mode of operation. Three differential pairs of films made of polyaniline (protonated and non-protonated), fluorine doped tin oxide and titanium dioxide were used: PANI-EB x PANI-ES, PANI-EB x FTO and FTO x TiO2. Good linearity was observed for all cases in the pH range 3 to 8. The differential measurements were also performed as a function of: i) temperature in the range 30 degrees C to 50 degrees C, ii) buffer concentration from 1 mM to 400 mM, and iii) time, for three hours. Hysteresis measurements for the 5-2-5-8-5 pH loop cycle were also conducted. The pair composed of polyaniline in the protonated and non-protonated form presented the best results with a sensitivity, of 37 +/- 4 mV/pH, good linearity, and stable response against variation of temperature and buffer concentration. A similarity in ion-sensing mechanisms and electrical properties of the single films is necessary for the fabrication of good and stable differential sensors as will be discussed. These materials can be satisfactorily used in miniaturized electronic sensor systems, thus promising great advances in the field. (C) 2016 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/24559-0 - Multimodal array of enzymatic biosensors: potentiometric differential mode, optical and conductometric
Grantee:Hugo José Nogueira Pedroza Dias Mello
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/09562-4 - Microelectronic biossensors associated with electrochemical techniques
Grantee:Marcelo Mulato
Support type: Regular Research Grants