A mini-review: How reliable is the drop casting technique?

Kumar, Archana Kaliyaraj Selva; Zhang, Yifei; Li, Danlei; Compton, Richard G.

doi:10.1016/j.elecom.2020.106867

Cited by 227 publications

(149 citation statements)

References 66 publications

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“…It is a simple technique where the screen-printed electrode surface is modified by using a solution that can be composed of particles such as nanotubes or nanoparticles [ 55 ].…”

Section: Spes Modification By Physical Approachesmentioning

confidence: 99%

Recent Trends in the Improvement of the Electrochemical Response of Screen-Printed Electrodes by Their Modification with Shaped Metal Nanoparticles

Torres-Rivero

Florido

Bastos-Arrieta

2021

Sensors

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Novel sensing technologies proposed must fulfill the demands of wastewater treatment plants, the food industry, and environmental control agencies: simple, fast, inexpensive, and reliable methodologies for onsite screening, monitoring, and analysis. These represent alternatives to conventional analytical methods (ICP-MS and LC-MS) that require expensive and non-portable instrumentation. This needs to be controlled by qualified technicians, resulting moreover in a long delay between sampling and high-cost analysis. Electrochemical analysis based on screen-printed electrodes (SPEs) represents an excellent miniaturized and portable alternative due to their disposable character, good reproducibility, and low-cost commercial availability. SPEs application is widely extended, which makes it important to design functionalization strategies to improve their analytical response. In this sense, different types of nanoparticles (NPs) have been used to enhance the electrochemical features of SPEs. NPs size (1–100 nm) provides them with unique optical, mechanical, electrical, and chemical properties that give the modified SPEs increased electrode surface area, increased mass-transport rate, and faster electron transfer. Recent progress in nanoscale material science has led to the creation of reproducible, customizable, and simple synthetic procedures to obtain a wide variety of shaped NPs. This mini-review attempts to present an overview of the enhancement of the electrochemical response of SPEs when NPs with different morphologies are used for their surface modification

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“…It is a simple technique where the screen-printed electrode surface is modified by using a solution that can be composed of particles such as nanotubes or nanoparticles [ 55 ].…”

Section: Spes Modification By Physical Approachesmentioning

confidence: 99%

Recent Trends in the Improvement of the Electrochemical Response of Screen-Printed Electrodes by Their Modification with Shaped Metal Nanoparticles

Torres-Rivero

Florido

Bastos-Arrieta

2021

Sensors

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“…Final particles distribution on electrode surface can vary depending on their behavior in drying droplet [ 7 ]. Figure 3 shows microscope images of deposits obtained after solvent evaporation from all described above suspensions.…”

Section: Resultsmentioning

confidence: 99%

“…Among considered materials are noble metals, metal oxides and (less often) sulfides, as well as carbon-based materials [ 6 ]. They can play a role of standalone electrodes or be immobilized on the substrate surface, e.g., carbon (CE) or glassy carbon electrode (GCE) [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…In general, such suspensions comprised a solvent, active material and binder for particles immobilization on the electrode surface [ 14 ]. Despite overall simplicity, special attention should be devoted in this technique to suspension properties as well as drying process [ 7 ]. In the literature, several factors have been recognized which affect deposited film morphology.…”

Section: Introductionmentioning

confidence: 99%

“…Deposits homogeneity has been reported to pose a significant effect on the diffusion of analyte to the geometric area of the electrode [ 7 ]. By choosing the appropriate polymer, mitigation of the coffee-ring effect can be achieved [ 16 ], which can be beneficial not only for ensuring diffusion linearity but also for electrodes reproducibility [ 7 ]. In this work, we provide a systematic study on binder-particles interactions within suspensions and their consequences on obtained deposits patterns.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nonenzymatic Glucose Sensors Based on Copper Sulfides: Effect of Binder-Particles Interactions in Drop-Casted Suspensions on Electrodes Electrochemical Performance

Mazurków

Kusior

Radecka

2021

Sensors

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The constant progress in novel nanomaterials synthesis has contributed to the rapid development of nonenzymatic glucose sensors. For working electrodes preparation, drop casting proved to be the most convenient and thus most widely applied method. However, appropriate interpretation of obtained electrochemical signal requires in-depth knowledge of limitations related to this technique. In this study, we prepared solutions based on commonly reported polymers for nanostructures immobilization and investigated their influence on copper sulfides distribution on the electrode. Characterization of suspensions properties and behavior of particles during droplet drying revealed that nonionic polyvinylpyrrolidone (PVP) was favorable for electrodes modification with copper sulfides in comparison with Nafion and chitosan. It ensured homogeneity of the suspension as well as the uniform coverage of the electrode surface with particles, what resulted in increased active surface area and, therefore, higher signal from glucose addition. On the other hand, when cationic chitosan was used as a binder, suspensions were agglomerated and, within dry deposits, a coffee-ring effect was observed. Appropriate adjustment of material and polymer interactions led to enhanced electrode electrochemical performance.

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