A Novel pH Sensor Using Extended-Gate Field-Effect Transistors with Ga2O3 Nanowires Fabricated on SiO2/Si Template

Wu, Ya‐Ling; Chang, Sheng-Po; Chang, Shoou-Jinn; Weng, W. Y.; Lin, Yo-Hong

doi:10.1166/sam.2015.1992

Cited by 9 publications

(5 citation statements)

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“…Nernst equation describes electrochemical cell potential as a function of ions concentrations taking part in the reaction. The ideal response was assumed to be 59.2 mV/pH at 25 0 C [13].…”

Section: Resultsmentioning

confidence: 99%

“…Which means that, the extra voltage ([H + ]) or reduced voltage ([OH -]) in V GS due to the pH influence, affectes the channel size. The I DS dependency on the pH value is due to the accumulation of [H + ] ions in the acidic solution on the sensing surface, which is similar to applying an additional positive voltage at the MOSFET gate [13]. This would result to conductive channel increase with concomitant current increase.…”

Section: Resultsmentioning

confidence: 99%

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The Study on the Effect of Wet and Dry Oxidation of Nickel Thin Film on Sensitivity of EGFET Based pH Sensor

Abubakar

Ahmed

Mahmud

2019

SSP

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The study is based on the use of NiO as an extended gate of field effect transistor (EGFET) using ITO/glass as a substrate for the sensitivity of pH sensor membrane. The NiO thin film was synthesis by wet and dry thermal oxidation method of Nickel metal thin film deposited by RF sputtering. The sensitivity of the NiO membrane was measured and comparatively analysed against the two different oxidation methods. Structural and morphological properties were investigated for both thin films. The sensitivities measurements of the two membranes were made as pH sensors. The results confirmed that NiO membrane grown by dry oxidation had much better sensitivity (87 μA/pH and 54 mV/pH) compared to wet oxidation membrane sample (52 μA/pH and 48 mV/pH).

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“…Nernst equation describes electrochemical cell potential as a function of ions concentrations taking part in the reaction. The ideal response was assumed to be 59.2 mV/pH at 25 0 C [13].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Study on the Effect of Wet and Dry Oxidation of Nickel Thin Film on Sensitivity of EGFET Based pH Sensor

Abubakar

Ahmed

Mahmud

2019

SSP

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“…One of the established health biomarkers is a stable pH, which is associated with all tissues of the body. Hence, biosensors for pH sensing have attracted significant interest in the scientific community [ 283 ]. Therefore, several metal-oxide materials have been used as sensing materials, widely applied to pH or biochemical sensors.…”

Section: Applicationsmentioning

confidence: 99%

“…Therefore, several metal-oxide materials have been used as sensing materials, widely applied to pH or biochemical sensors. SnO 2 , ZnO, RuO 2 , WO 3 , ITO, TiO 2 , ZrO 2 , Ta 2 O 5 , HfO 2 , and Ga 2 O 3 have been widely used as sensing materials for pH sensors [ 252 , 283 , 284 ]. Among oxide materials, Ga 2 O 3 is a wide band gap material that has attracted considerable attention in very recent years because it possesses many advantages (including nontoxicity, thermal stability, and excellent chemical and ideal biocompatible properties) [ 252 , 283 , 284 ].…”

Section: Applicationsmentioning

confidence: 99%

“…SnO 2 , ZnO, RuO 2 , WO 3 , ITO, TiO 2 , ZrO 2 , Ta 2 O 5 , HfO 2 , and Ga 2 O 3 have been widely used as sensing materials for pH sensors [ 252 , 283 , 284 ]. Among oxide materials, Ga 2 O 3 is a wide band gap material that has attracted considerable attention in very recent years because it possesses many advantages (including nontoxicity, thermal stability, and excellent chemical and ideal biocompatible properties) [ 252 , 283 , 284 ]. In addition to being widely used in photodetectors, gas sensors, photocatalysis, and photodegradation, gallium oxide is also used in pH sensors.…”

Section: Applicationsmentioning

confidence: 99%

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A Review on Gallium Oxide Materials from Solution Processes

et al. 2022

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Gallium oxide (Ga2O3) materials can be fabricated via various methods or processes. It is often mentioned that it possesses different polymorphs (α-, β-, γ-, δ- and ε-Ga2O3) and excellent physical and chemical properties. The basic properties, crystalline structure, band gap, density of states, and other properties of Ga2O3 will be discussed in this article. This article extensively discusses synthesis of pure Ga2O3, co-doped Ga2O3 and Ga2O3-metal oxide composite and Ga2O3/metal oxide heterostructure nanomaterials via solution-based methods mainly sol-gel, hydrothermal, chemical bath methods, solvothermal, forced hydrolysis, reflux condensation, and electrochemical deposition methods. The influence of the type of precursor solution and the synthesis conditions on the morphology, size, and properties of final products is thoroughly described. Furthermore, the applications of Ga2O3 will be introduced and discussed from these solution processes, such as deep ultraviolet photodetector, gas sensors, pH sensors, photocatalytic and photodegradation, and other applications. In addition, research progress and future outlook are identified.

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Sodium‐Ion Storage Properties of FeS–Reduced Graphene Oxide Composite Powder with a Crumpled Structure

Lee

Kang

2016

Chemistry A European J

105

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The sodium-ion storage properties of FeS-reduced graphene oxide (rGO) and Fe3O4 -rGO composite powders with crumpled structures have been studied. The Fe3 O4 -rGO composite powder, prepared by one-pot spray pyrolysis, could be transformed to an FeS-rGO composite powder through a simple sulfidation treatment. The mean size of the Fe3O4 nanocrystals in the Fe3O4 -rGO composite powder was 4.4 nm. After sulfidation, FeS nanocrystals of size several hundred nanometers were confined within the crumpled structure of the rGO matrix. The initial discharge capacities of the FeS-rGO and Fe3O4 -rGO composite powders were 740 and 442 mA h g(-1), and their initial charge capacities were 530 and 165 mA h g(-1), respectively. The discharge capacities of the FeS-rGO and Fe3O4 -rGO composite powders at the 50th cycle were 547 and 150 mA h g(-1), respectively. The FeS-rGO composite powder showed superior sodium-ion storage performance compared to the Fe3O4 -rGO composite powder.

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A Novel pH Sensor Using Extended-Gate Field-Effect Transistors with Ga₂O₃ Nanowires Fabricated on SiO₂/Si Template

Cited by 9 publications

References 0 publications

The Study on the Effect of Wet and Dry Oxidation of Nickel Thin Film on Sensitivity of EGFET Based pH Sensor

The Study on the Effect of Wet and Dry Oxidation of Nickel Thin Film on Sensitivity of EGFET Based pH Sensor

A Review on Gallium Oxide Materials from Solution Processes

Sodium‐Ion Storage Properties of FeS–Reduced Graphene Oxide Composite Powder with a Crumpled Structure

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