Using Deionized Water with Ethanol as a Solvent of CuS EGFET as pH Sensor

Sabah, Fayroz A.; Ahmed, Naser M.; Hassan, Z.; Almessiere, M.A.

doi:10.4028/www.scientific.net/msf.886.37

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…investigated the dependence of performance of the sensor on the thickness of the CuS film. [ 306 ] The group has also reported other works in which Ni/ITO thin film, [ 307 ] ITO thin film by RF‐sputtering method, [ 308 ] CuS membranes deposited on glass substrates, [ 309 ] multilayer ZnO/Pd/ZnO structure, [ 310 ] CuS membranes deposited using spray pyrolysis, laser‐assisted spray pyrolysis, and laser‐assisted spray photolysis deposition techniques [ 292,311 ] as EGFET‐based pH sensors with varied temperature treatments to enhance the sensor response. Das et al.…”

Section: Fet‐based Microsensorsmentioning

confidence: 99%

A comprehensive review of FET‐based pH sensors: materials, fabrication technologies, and modeling

Sinha

Pal

2021

Electrochemical Science Adv

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The demand for miniaturized point‐of‐care chemical/biochemical sensors has driven the development of field‐effect transistors (FETs) based pH sensors over the last 50 years. This paper aims to review the fabrication technologies, device structures, sensing film materials, and modeling techniques utilized for FET‐based pH sensors. We present the governing principles of potentiometric sensors, with major focus on the working principles of ion‐sensitive FETs (ISFETs). We extensively review different sensing film materials deposited by various techniques, which is critical to the sensing performance of ISFETs. The popular fabrication technologies have been presented, with special emphasis on state‐of‐the‐art silicon‐on‐insulator based technology, which can achieve high sensitivity by utilizing the dual‐gate effect. Furthermore, recent advancements in nano‐ISFETs has been elucidated. We also discuss the adoption of unmodified complementary metal‐oxide semiconductor (CMOS) ISFETs using standard CMOS processes, which has enabled the fabrication of integrated ISFET arrays, which are especially suited for ion‐imaging applications. Moreover, recent developments in extended‐gate FETs has been discussed, which have gained lot of attention due to their design flexibility and ease of fabrication, which is desirable for wearable sensing applications. In addition, recently there have been efforts to utilize nonsilicon channel materials for pH‐sensing application to obtain superior performance and various channel materials have been reviewed. Finally, we have extensively reviewed the ISFET device modeling and simulation techniques using various computer‐aided design tools, which aid in sensor design and characterization.

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Section: Fet‐based Microsensorsmentioning

confidence: 99%

A comprehensive review of FET‐based pH sensors: materials, fabrication technologies, and modeling

Sinha

Pal

2021

Electrochemical Science Adv

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show abstract

“…EGFET and ion-sensitive field-effect transistors have the same concept, but the main difference is that the membrane of EGFET is extended from MOSFET. 23 EGFETs have many apparent advantages over ion-sensitive field-effect transistors, such as low cost, simple passivation and packaging, temperature and light insensitivity, the flexible shape of the extended gate structure, and good long-term stability. 24 Because of these advantages, EGFETs are regarded as substitutes for traditional ion-sensitive field-effect transistors.…”

mentioning

confidence: 99%

A Microfluidic pH Sensor with Temperature Compensation Based on Extended-Gate Field-Effect Transistor

Zou¹,

Wang²,

Su³

et al. 2023

J. Electrochem. Soc.

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PH sensors are widely used in food processing, health monitoring, water quality monitoring, and many other fields. A pH sensor applied for health monitoring can realize real-time measurement of human health information, allowing for timely prevention of diseases so as to improve people's health. However, these sensors have some challenges in body fluid collection and temperature compensation. Here, we developed a pH sensor based on an extended-gate field-effect transistor with a microfluidic channel and a temperature sensor to overcome these challenges. The sensor is prepared using a low-cost, solution-based process in which a temperature sensor is used for body temperature measurement and temperature compensation, and a microfluidic channel is used for body fluid collection. This pH sensor can measure both body temperature and pH of body fluid, where the temperature coefficient of resistance of the temperature sensor is up to 5.17%, and the measurement result of body temperature is only 0.17℃ different from that of gold standard. The pH sensitivity is 58.41 mV/pH, and the pH value deviates only 0.066 from the standard pH value. The sensor is expected to be used on a large scale in the applications of wearable health monitors.

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Development of EGFET-based ITO pH sensors using epoxy free membrane

Ahmed

Sabah²,

Al-Hardan

et al. 2021

Semicond. Sci. Technol.

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The design of high-performance cavity for the accurate and efficient operation of various pH sensors remains challenging. In this paper, we report the simplistic design of an epoxy-free cavity with good quality contact effective for the extended gate field effect transistor (EGFET)-based pH sensors. This inexpensive, simple and leakage current free brass-based Teflon cavity was designed to separate the sensitive film devoid of the epoxy. The performance of the proposed cavity was assessed against four indium tin oxide (ITO) thin films (sensing membranes acted as pH sensors) of different sheet resistance by integrating into EGFET. The structure, morphology and sensing characteristics of these ITO membranes were determined as a function of varying resistance. The results revealed the formation of excellent electrical contacts and responses of these sensors to the changing pH values. The proposed pH sensors with the resistance of 2.5, 9.0, 15 and 35 kΩ showed the corresponding sensitivity of 34.86, 30, 16.66 and 17.5 mV pH−1, respectively. It is asserted that the designed cavity may contribute towards the evolution of efficient sensing electrodes desired for diverse applications in the field of pH, biomedical, electrochemical and ions selective sensors.

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Using Deionized Water with Ethanol as a Solvent of CuS EGFET as pH Sensor

Cited by 3 publications

References 12 publications

A comprehensive review of FET‐based pH sensors: materials, fabrication technologies, and modeling

A comprehensive review of FET‐based pH sensors: materials, fabrication technologies, and modeling

A Microfluidic pH Sensor with Temperature Compensation Based on Extended-Gate Field-Effect Transistor

Development of EGFET-based ITO pH sensors using epoxy free membrane

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