Electrodeposition of reduced graphene oxide on a Pt electrode and its use as amperometric sensor in microchip electrophoresis

Lucca, Bruno Gabriel; Lima, Fábio de; Coltro, Wendell K. T.; Ferreira, Valdir Souza

doi:10.1002/elps.201500092

Cited by 24 publications

(17 citation statements)

References 57 publications

(62 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structure of the working electrodes fabricated shows the shape of sheets in that the borders of these sheets might act like an arrangement of microelectrodes. This conductive structure might favor the mass transfer phenomenon and the analytical sensitivity , .…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical techniques in conjunction with screen‐printed sensors may be an interesting alternative for the determination of environmental pollutants since it has as advantages the low cost, ease of operation, satisfactory sensitivity and selectivity and provides rapid analytical response . Moreover the required instrumentation may be easily miniaturized, which allows performing in‐field analysis .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simple and Inexpensive Electrochemical Platform Based on Novel Homemade Carbon Ink and its Analytical Application for Determination of Nitrite

2017

Self Cite

View full text Add to dashboard Cite

In this work we present the development of a simple handmade approach for the easy fabrication of three‐electrode electrochemical devices based on newly in‐house developed carbon ink composed of graphite powder and polystyrene. Different proportions of graphite/polystyrene were investigated for the optimization of the ink. The counter and reference electrodes were produced using commercial carbon ink and silver glue. Scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used to investigate the morphology and the electrochemical properties of the sensor. The results showed that the electroactive area of the optimized working electrode was ca. 2.35 times larger than its geometric area. The RSD values obtained for repeatability and reproducibility were 0.20% and 2.78%, respectively, which suggest no significant variation on the electrodes fabricated. The analytical feasibility of the electrode was tested through its application for the determination of nitrite in drinking water. The quantifications were successfully performed at levels below the maximum contaminant level established for nitrite. A limit of detection of 1.42 × 10−6 mol L−1 and recoveries of ca. 103 % were achieved. The results were validated using ion‐chromatography technique with good agreement. The performance of the unmodified sensor proposed here on nitrite determination was better than some recently reported modified electrodes obtained through complex procedures.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simple and Inexpensive Electrochemical Platform Based on Novel Homemade Carbon Ink and its Analytical Application for Determination of Nitrite

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, the RGO‐CuNP dispersed over the GCRE exhibited a curly and wrinkle structure that is characteristic of graphene films. The deposited RGO‐CuNP creates an interconnected network throughout the electrode surface that is responsible for the increase on the conductivity and sensitivity . Additionally, the copper nanoparticles also can be visualized in the SEM images as round and bright points throughout the surface of the modified electrode.…”

Section: Resultsmentioning

confidence: 99%

Paper‐based Electrochemical Devices Coupled to External Graphene‐Cu Nanoparticles Modified Solid Electrode through Meniscus Configuration and their Use in Biological Analysis

et al. 2017

Self Cite

View full text Add to dashboard Cite

This paper demonstrates, for the first time, the use of paper‐based electrochemical devices coupled to external solid working electrodes. The paper‐based electrochemical cells were fabricated using inexpensive and largely available office paper, according to a simple protocol that consists on the creation of hydrophobic barriers using paraffinized paper and preheated metal stamp. The counter and reference electrodes were integrated to the paper platform through the deposition of carbon and silver inks, respectively. The electrochemical paper analytical device (ePAD) was coupled to external glassy carbon rod electrode modified with reduced graphene oxide doped with Cu nanoparticles through meniscus configuration. The analytical usefulness of this electrochemical approach was demonstrated through the simultaneous determination of paracetamol and caffeine in biological samples. The analytes were successfully quantified in real urine samples and limits of detection of 24.6 nM (paracetamol) and 36.1 nM (caffeine) were obtained. The paper platform showed good stability (RSD of 1.07 % for the peak currents and 1.43 % for the peak potentials) and satisfactory performance. The use of solid electrodes coupled to paper electrochemical devices, firstly demonstrated here, opens new possibilities for the utilization of ePADs in electrochemistry and electroanalytical chemistry and offers advantages such as the extremely reduced consumption of reagents and the minimal generation of wastes.

show abstract

“…The electrophoretic experiments were performed using a home‐made instrument described elsewhere . It is equipped with a ± 2000 VDC (EMCO models CA20N and CA20P) that provides the injection and separation high voltages.…”

Section: Methodsmentioning

confidence: 99%

“…Amperometric detection (AD) offers good sensitivity, simplicity, easiness of operation and possibility of miniaturization of the instrumentation. Furthermore, the microfabrication methods frequently used for production of ME devices can also be employed for the fabrication of sensors for AD . Several types of materials can be employed as electrochemical sensor and coupled to ME for amperometric detection.…”

Section: Introductionmentioning

confidence: 99%

Rapid and inexpensive method for the simple fabrication of PDMS‐based electrochemical sensors for detection in microfluidic devices

2019

Self Cite

View full text Add to dashboard Cite

The fabrication of PDMS microfluidic structures through soft lithography is widely reported. While this well‐established method gives high precision microstructures and has been successfully used for many researchers, it often requires sophisticated instrumentation and expensive materials such as clean room facilities and photoresists. Thus, we present here a simple protocol that allows the rapid molding of simple linear microchannels in PDMS substrates aiming microfluidics‐based applications. It might serve as an alternative to researchers that do not have access to sophisticated facilities such as clean rooms. The method developed here consists on the use of pencil graphite leads as template for the molding of PDMS channels. It yields structures that can be used for several applications, such as housing support for electrochemical sensors or channels for flow devices. Here, the microdevices produced through this protocol were employed for the accommodation of carbon black paste, which was utilized for the first time as amperometric sensor in microchip electrophoresis. This platform was successfully used for the separation and detection of model analytes. Ascorbic acid and iodide were separated within 45 s with peak resolution of 1.2 and sensitivities of 198 and 492 pA/μM, respectively. The background noise was ca. 84 pA. The analytical usefulness of the system developed was successfully tested through the quantification of iodide in commercial pharmaceutical formulations. It demonstrates good efficiency of the microfabrication protocol developed and enables its use for the easy and rapid prototyping of PDMS structures over a low fabrication cost.

show abstract

Electrodeposition of reduced graphene oxide on a Pt electrode and its use as amperometric sensor in microchip electrophoresis

Cited by 24 publications

References 57 publications

Simple and Inexpensive Electrochemical Platform Based on Novel Homemade Carbon Ink and its Analytical Application for Determination of Nitrite

Simple and Inexpensive Electrochemical Platform Based on Novel Homemade Carbon Ink and its Analytical Application for Determination of Nitrite

Paper‐based Electrochemical Devices Coupled to External Graphene‐Cu Nanoparticles Modified Solid Electrode through Meniscus Configuration and their Use in Biological Analysis

Rapid and inexpensive method for the simple fabrication of PDMS‐based electrochemical sensors for detection in microfluidic devices

Contact Info

Product

Resources

About