What is the functional performance of the pH sensors?
Best insight from top research papers
The pH sensors in the papers demonstrate good functional performance. The optical fiber pH sensor has a high sensitivity of 0.985 nm/pH, a linear response in the pH range of 2-12, and a response time and recovery time of less than 10 s . The polyaniline/graphite composite pH sensor exhibits a stable and near-Nernstian sensitivity of 53 mV/pH, a response time of 15 s, and a pH range from 3 to 10 . The polyaniline nanofiber array-based pH sensor shows a sensitivity of 62.4 mV/pH, a response time of 12.8 s, and a durability of 3.0 mV/h . The dual-gated graphene FET pH sensor has a sensitivity of up to 30 V per unit change in pH, noise-limited resolution of 2 × 10−4, and operates in the 0.1-10 Hz bandwidth . The flexible chemiresistive pH sensor based on carboxyl-functionalized single-walled carbon nanotubes demonstrates a linear response to pH values from 5 to 9, with a response time ranging from 0.2 s to 22.6 s .
Answers from top 5 papers
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| Papers (5) | Insight |
|---|---|
14 Citations | The pH sensors based on carboxyl-functionalized SWNTs show high sensitivity, rapid response time, reversibility, repeatability, and flexibility. |
1 Citations | The pH sensors exhibit a sensitivity of up to 30V per unit change in pH and a noise-limited resolution of 2x10^-4 in the 0.1-10Hz bandwidth. |
| The pH sensors showed a sensitivity of 62.4 mV/pH, repeatability of 97.9% retention, response time of 12.8 s, and durability of 3.0 mV/h. | |
| The pH sensors have a high sensitivity of 0.985 nm/pH, a linear response in a pH range of 2-12, and a response time of less than 10 seconds. | |
| The pH sensors exhibited a linear, stable, and near-Nernstian sensitivity of 53 mV/pH and a response time of 15 s. |
Related Questions
Why are optical sensors a good alternative for pH sensing?5 answersOptical sensors offer significant advantages for pH sensing due to their rapid response times, high sensitivity, and stability. These sensors utilize innovative techniques such as smart hydrogel materials, optofluidic ring resonators, and fiber-optic tips coated with pH-sensitive dyes to provide accurate and real-time pH measurements. Optical sensors can detect pH changes in microfluidic environments, low-pH aqueous solutions, and biological mediums with enhanced precision and reliability. They overcome limitations of traditional sensors by offering minimal drift, reduced leaching of indicator dyes, and improved stability over extended periods of use. Additionally, optical sensors enable label-free, in situ detection, making them valuable for applications in medicine, environmental monitoring, and biological research.
Is there a need from the industry to develop new pH sensors?4 answersYes, there is a significant industry demand for the development of new pH sensors due to various applications requiring accurate pH monitoring. Different studies have highlighted the need for improved pH sensors in fields such as biological sample analysis, perishable food industry, health monitoring for disease prevention, and chemical processes. The advancements in pH sensor technology include optochemical sensors for cell analysis, polymer waveguide Bragg grating sensors for enhanced sensitivity, and ISFET-based sensors with machine learning for drift compensation. These developments address challenges like toxicity, stability, sensitivity, miniaturization, and drift compensation, making the new pH sensors more efficient and reliable for a wide range of industries.
Is there a need from the industry to develop new subsea pH sensors?5 answersThe industry indeed shows a demand for the development of new subsea pH sensors due to various reasons outlined in recent research. Existing sensors face challenges such as limited accuracy at extreme pH levels, the necessity for calibration-free designs for seawater applications, and the need for high-precision, autonomous sensors with deep-depth capabilities for ocean pH monitoring. Studies emphasize the optimization of sensor materials for seawater measurements, focusing on factors like dynamic range, response time, and cross-sensitivity to temperature and ionic strength. Furthermore, the push for high-accuracy, high-resolution pH sensors for global ocean acidification mapping using hybrid measurement techniques highlights the industry's drive for innovative solutions. These collective findings underscore the industry's call for advanced subsea pH sensors to meet evolving monitoring needs.
What are the existing theories and concepts about pH sensors?4 answersExisting theories and concepts about pH sensors include the use of graphene-based van der Waals heterostructures for pH sensing, wearable pH sensors based on sensitive materials such as polyaniline (PANI), hydrogen ionophores (HIs), and metal oxides (MOx), a sensor and method that measures pH without using an external reference electrode, the exploration of alternative sensitive devices and materials to replace the glass electrode as the gold standard for pH measurement, and the development of a pH sensor composed of a double-gate silicon nanowire field-effect transistor (DG Si-NW FET) that allows for independent addressing of the gate voltage and amplification of the pH signal through modulation of the gate oxide thickness.
How can pH sensors can also be used for pH regulation inside the human body?2 answerspH sensors can be used for pH regulation inside the human body by monitoring and controlling the pH level in various bodily fluids. One approach is the use of solid-state pH sensors, such as the Titanium Nitride (TiN) sensor modified with Nafion. This modification minimizes the redox shift and improves accuracy in highly redox samples, making it suitable for pH regulation inside the body. Another approach is the development of pH sensors based on extended-gate field-effect transistors with microfluidic channels and temperature sensors. These sensors can measure both body temperature and pH of body fluids, allowing for real-time monitoring and timely prevention of diseases. Additionally, wearable pH sensors based on sensitive materials like polyaniline (PANI), hydrogen ionophores (HIs), and metal oxides (MOx) have been developed for continuous monitoring of pH levels in biological fluids. These sensors can play a significant role in portable personalized medicine and the diagnosis and treatment of diseases. Furthermore, fiber-based ratiometric optical pH sensors have been developed for real-time and continuous in vivo pH monitoring in human tissue. These sensors exhibit high sensitivity, resolution, reproducibility, stability, and short response time, making them suitable for pH regulation inside the body. Finally, a strip-based solid-state pH sensor using palladium nanoparticles (PdNPs)/N-doped carbon (NC) composite material has been developed for accurate and real-time diagnosis of pH in body fluids. This sensor shows high sensitivity, stability, and selectivity, making it applicable for pH regulation inside the body.
What is PH sensor?5 answersA pH sensor is a device used to measure the acidity or alkalinity of a solution. It is important in various fields such as environmental monitoring, biological research, and industrial processes. Traditional methods like glass electrodes and litmus paper have limitations in terms of accuracy, fragility, and miniaturization. pH sensors typically consist of a reference electrode and a pH-sensitive electrode, which measure the potential difference between them to determine the pH level. There are different types of pH sensors, including colorimetric and fluorescence sensors, which use chemical and biochemical tools to sense protons and produce a visible signal. In the biomedical field, pH sensors have been developed to detect and study implant-associated infections. These sensors use radiography to measure the local pH near orthopedic implants. Remote control of pH using light is also being explored as an intelligent and cost-effective approach.