Differential type solid-state urea biosensors based on ion-selective electrodes

Chou, Nien Hsuan; Chou, Jung-Chuan; Sun, Tai; Hsiung, Shen Kan

doi:10.1016/j.snb.2007.09.014

Cited by 29 publications

(7 citation statements)

References 45 publications

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“…Recently, there were many studies introducing extended-gate field-effect transistor (EGFET) as an alternative for the fabrication of ISFET [2,3]. EGFET exhibited many advantages over the conventional ISFET, such as low cost, simpler packaging, temperature and light insensitivity, flexibility of shape of the extended-gate structure, and better long-term stability [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Coaxial-structured ZnO/silicon nanowires extended-gate field-effect transistor as pH sensor

Yang

Kei

et al. 2013

Thin Solid Films

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Section: Introductionmentioning

confidence: 99%

Coaxial-structured ZnO/silicon nanowires extended-gate field-effect transistor as pH sensor

Yang

Kei

et al. 2013

Thin Solid Films

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“…flexibility of the extended-gate structure, less insensitivity induced by temperature and light fluctuations, and better long-term stability. 4 Recently, Chi, Yin and Chou et al [5][6][7] have improved upon the EGFET structure that was separated into two parts. The first part was the sensing head and the second was a commercial standard metal-oxidesemiconductor field-effect transistor (MOSFET).…”

Section: Introductionmentioning

confidence: 99%

The pH Sensitivity and Characteristics of AZO Nanorods Based on the Extended-Gate Field-Effect Transistor

Chiang¹,

Tsai²,

Kao³

2015

j comput theor nanosci

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In this study, the AZO nanorods were used as pH sensor materials based on extended-gate fieldeffect transistor (EGFET) and the pH sensitivity and AZO nanostructure characteristics were investigated and discussed in the different pH buffer solutions. The aluminum-doped zinc oxide nanorods were grown by hydrothermal method. The pre-treatment procedures were included the 0.0075 M zinc acetate solution was spin-coated on Si substrates for different number of times. Secondary, the substrate was submerged horizontally in zinc nitrate hexahydrate (Zn(NO 3 2 · 6H 2 O), diethylenetriamine (DETA), and doped the solution of aluminium nitrate, nonahydrate (Al(NO 3 3 · 9H 2 O) at about 120 C for 4 h. The AZO nanorods sensing structure based on the EGFET was finished. Accordingly, the size and surface morphology of the AZO nanorods were examined by a field emission scanning electron microscope (FE-SEM), and the current-voltage characteristics curves and pH sensitivities were measured by the semiconductor parameter analyzer. The experimental results found that the morphology of AZO is that of a rod clusters and the hexagonal phase of wurtzite structures can be obtained. The smaller diameter of AZO nanorods can be obtained at 12 times pre-treatment. In addition, the superior pH sensing response in pH 7∼12 buffer solutions at 6 times pre-treatment, the pH sensitivity is very high, and the pH response is linearity.

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“…6) The EGFET configuration offers many advantages such as low cost, simple passivation and encapsulation, high shape flexibility of the extended-gate electrode, good temperature and light fluctuation immunity, and long-term stability. 7) Furthermore, a modified structure of the EGFET with a commercial MOSFET was also presented in 2000. 8) The modified separated electrode (SE) of EGFETs (SE-EGFETs) have been extensively used for pH and biomeasurement.…”

Section: Introductionmentioning

confidence: 99%

Preparation of TiO₂ nanowire arrays through hydrothermal growth method and their pH sensing characteristics

Huang

Tsai

Wang

2014

Jpn. J. Appl. Phys.

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The use of a TiO2 nanowire (NW) hydrothermally grown on an fluorine-doped tin oxide (FTO) substrate as a separated sensing electrode of an extended-gate field-effect-transistor (SE-EGFET) pH sensor is demonstrated. Sensing responses to the prepared samples in a wide pH range (2–12) are presented and compared with responses of a film-type TiO2 electrode. The pH sensors with the NW-type and film-type electrodes show a sensitivity of 62 and 50 mV/pH, respectively, and a comparably good linearity in the pH range of 2–12. The superiority of the NW-type TiO2 electrode (24% improvement in sensitivity compared with that of the film-type electrode) is attributed mainly to the higher surface-to-volume (SV) ratio and higher conductivity of the hydrogen thermal growth (HTG) nanowires.

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Differential type solid-state urea biosensors based on ion-selective electrodes

Cited by 29 publications

References 45 publications

Coaxial-structured ZnO/silicon nanowires extended-gate field-effect transistor as pH sensor

Coaxial-structured ZnO/silicon nanowires extended-gate field-effect transistor as pH sensor

The pH Sensitivity and Characteristics of AZO Nanorods Based on the Extended-Gate Field-Effect Transistor

Preparation of TiO₂ nanowire arrays through hydrothermal growth method and their pH sensing characteristics

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Differential type solid-state urea biosensors based on ion-selective electrodes

Cited by 29 publications

References 45 publications

Coaxial-structured ZnO/silicon nanowires extended-gate field-effect transistor as pH sensor

Coaxial-structured ZnO/silicon nanowires extended-gate field-effect transistor as pH sensor

The pH Sensitivity and Characteristics of AZO Nanorods Based on the Extended-Gate Field-Effect Transistor

Preparation of TiO2 nanowire arrays through hydrothermal growth method and their pH sensing characteristics

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Product

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Preparation of TiO₂ nanowire arrays through hydrothermal growth method and their pH sensing characteristics