Enhancing the sensitivity of cobalt based solid-state phosphate sensor using electrical pretreatment

Patel, Vinay; Selvaganapathy, P. Ravi

doi:10.1016/j.snb.2021.130789

Cited by 7 publications

(6 citation statements)

References 51 publications

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“…37,40,42,43,51,44 A recent study eliminated the need of chemical pretreatment with in situ electrical pretreatment process. 56 In this study, an anodic electrical pretreatment was done before the measurement in the same solution thereby eliminating the need of pretreatment solution before the measurement. The study also performed the measurements in 20 mM sodium chloride as background electrolyte along with real samples testing like spiked lake water, tap water and creek water.…”

Section: Comentioning

confidence: 99%

Review—Solid State Sensors for Phosphate Detection in Environmental and Medical Diagnostics

Patel

Kruse

Selvaganapathy

2022

J. Electrochem. Soc.

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Phosphorus is required for plants and humans to survive because it is needed for cell signaling, skeletal integrity, energy storage, and metabolism. Phosphorus measurements are performed using colorimetric and electrochemical methods. Colorimetry is the most accepted method for commercial devices while electrochemical systems are still in the research phase. Here we provide the first comprehensive review of solid-state sensors for phosphate monitoring. The review focuses on solid state reagent storage for colorimetric sensors and different materials used in solid state electrochemical sensors. The electrochemical sensors are further classified into three groups: potentiometric, amperometric, and voltammetric. All sensors are evaluated based on parameters such as measurement range, limit of detection (LOD), working pH, and response time. Finally, we discuss limitations of the current sensors and future directions for the development of these sensors.

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Section: Comentioning

confidence: 99%

Review—Solid State Sensors for Phosphate Detection in Environmental and Medical Diagnostics

Patel

Kruse

Selvaganapathy

2022

J. Electrochem. Soc.

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“…However, acidi cation is needed to perform measurements at pH 4, which will require the addition of reagents for environmental water analysis. ) at pH 4 [19], which a limit of detection estimated to be ∼10 -7 M. Among the various electrochemical techniques, the most common include cyclic voltammetry (CV), square wave voltammetry (SWV), and DC-potential amperometry (DCPA) [20].…”

Section: Introductionmentioning

confidence: 99%

A dip-and-read impedimetric electrochemical sensor for orthophosphate monitoring

Moreira,

Shaw,

Amin

et al. 2024

Preprint

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Phosphorus (P) is an essential element for all life forms and a finite resource. P cycle plays a vital role in regulating primary productivity, making it a limiting nutrient for agricultural production and increasing the development of fertilizers through extractive mining. However, excessive P may cause detrimental environmental effects on aquatic and agricultural ecosystems. As a result, there is a pressing need for conservation and management of P loads through analytical techniques to measure P and precisely determine P speciation. Here, we explore a new 2D sorbent structure (GO-PDDA) for sensing orthophosphate in aqueous samples. The sorbent mimics a group of phosphate-binding proteins in nature and is expected to bind orthophosphate in solution. Laser-induced graphene (LIG) was coated with GO-PDDA using a drop-cast method. Electrochemical impedance spectroscopy was used as a transduction technique for electrochemical sensing of orthophosphate (HPO42−) and selectivity assay for chloride, sulfate and nitrate in buffer at pH 8. The analytical sensitivity was estimated to be 347 ± 90.2 Ω/ppm with a limit of detection of 0.32 ± 0.04 ppm. Selectivity assays demonstrate that LIG-GO-PDDA is 95% more selective for ortho-P over sulfate and 80% more selective over chloride and nitrate. The developed sensor can be reused after surface regeneration with an acidic buffer (pH 5), with slight changes in sensor performance. Our results show that the sorbent structure is a promising candidate for developing electrochemical sensors for environmental monitoring of orthophosphate and may provide reliable data to support sustainable P management.

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“…Chemiresistive sensors have been commercialized for gas detection, 23 but they are not commonly deployed in aqueous solutions due to their sensitivity to pH and ionic strength, the need to avoid electrochemical side reactions and electrolytic water splitting in addition to non-specific bindings and low interaction energy between analyte and the resistive film in water. 4,24 Some chemiresistive sensors have been developed in our research group for the measurement of different analytes such as free chlorine, [25][26][27] silver, 13 phosphate 28 and pH. 29 In free chlorine measurement, other oxidants might interfere with free chlorine detection.…”

Section: Introductionmentioning

confidence: 99%

An ion-selective chemiresistive platform as demonstrated for the detection of nitrogen species in water

Darestani-Farahani,

Ma,

Patel

et al. 2023

Analyst

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Enhancing the sensitivity of cobalt based solid-state phosphate sensor using electrical pretreatment

Cited by 7 publications

References 51 publications

Review—Solid State Sensors for Phosphate Detection in Environmental and Medical Diagnostics

Review—Solid State Sensors for Phosphate Detection in Environmental and Medical Diagnostics

A dip-and-read impedimetric electrochemical sensor for orthophosphate monitoring

An ion-selective chemiresistive platform as demonstrated for the detection of nitrogen species in water

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