Characterization of ultramicroelectrode arrays combining electrochemical techniques and optical microscopy imaging

Orozco, Jahir; Suárez, Guillaume; Fernández‐Sánchez, César; McNeil, Calum J.; Jiménez-Jorquera, Cecilia

doi:10.1016/j.electacta.2007.07.049

Cited by 34 publications

(39 citation statements)

References 28 publications

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“…Voltammetric responses of a bare UMEA showed the characteristic steady-state current of the redox probe with a current density of 3.64 mA cm À2 (see Figure 1, curve a and Table 2), which is 14 times higher than that of the microelectrode (0.26 mA cm À2 ) (Table 2). Remarkably, the electrodeposition of AuNPs on the UMEA surface highly increased Table 2), which is likely to be related to a slight increase in the individual disc radius due to the electrodeposition of AuNPs [38]. Based on the higher surface area of AuNP-modified UMEAs (Table 1) and the apparent catalytic effect of AuNPs, an enhanced electrochemical response in terms of electron transfer facility when SAMs were formed on their surface is expected, as will be shown below.…”

Section: Electrochemical Characterization Of Bare Substratesmentioning

confidence: 88%

“…A miniaturized Ag/AgCl pseudo-reference electrode RC6 (50-mm length, 1.5-mm external diameter from World Precision Instruments) was used for electrodeposition experiments. Au microelectrodes and UMEAs were simultaneously fabricated at wafer level at the IMB-CNM Clean Room facilities by standard photolithographic techniques, as described elsewhere [38]. .…”

Section: Apparatus and Electrodesmentioning

confidence: 99%

“…The active electrochemical surface area was evaluated by CV at 0.1 V s À1 in a 0.1 M KNO 3 solution containing 1 mM K 4 Fe(CN) 6 ·3H 2 O or K 3 Fe(CN) 6 for UMEAs and microelectrodes, respectively. CV at 0.1 V s À1 between À0.2 and + 1.4 V in 0.1 M H 2 SO 4 /0.1 M KNO 3 were recorded to estimate the microscopic surface area of the Au substrates [38].…”

mentioning

confidence: 99%

“…AuNPs exhibit a net negative charge induced in their preparation process, which was used to deposit them over the UMEA surface [38]. Electrodeposition of AuNPs on the UMEA surface was carried out as follows.…”

mentioning

confidence: 99%

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Electrochemical Performance of Self‐Assembled Monolayer Gold Nanoparticle‐Modified Ultramicroelectrode Array Architectures

2012

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Surface architectures based on gold nanoparticles (AuNPs) electrodeposited on gold ultramicroelectrode arrays (UMEAs) and further modified with self-assembled monolayers (SAMs) of two different thiol molecules were evaluated. The voltammetric behavior of the resulting electrochemical transducer approaches appeared to be fairly different compared to that of SAM-modified UMEAs and microelectrode counterparts. Such behavior indicates that the electrodeposited AuNPs played a key role in the arrangement of the thiolated probes and the electron transfer processes at the transducer solution interface. A detailed description of this phenomenon was carried out with the aim of showing the potential of the presented SAM-AuNP-UMEA based transducer to develop robust biosensor approaches.

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Section: Electrochemical Characterization Of Bare Substratesmentioning

confidence: 88%

Section: Apparatus and Electrodesmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Electrochemical Performance of Self‐Assembled Monolayer Gold Nanoparticle‐Modified Ultramicroelectrode Array Architectures

2012

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“…The electrodes set was fabricated on a silicon substrate at the IMB-CNM clean room facilities, according to a previously described photolithographic process (Orozco et al, 2007).…”

Section: Electrochemical Transducermentioning

confidence: 99%

Cost-effective smartphone-based reconfigurable electrochemical instrument for alcohol determination in whole blood samples

Aymerich

Márquez

Terés

et al. 2018

Biosensors and Bioelectronics

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Simultaneous Detection of Copper, Lead and Zinc on Tin Film/Gold Nanoparticles/Gold Microelectrode by Square Wave Stripping Voltammetry

et al. 2012

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In this work, three heavy metals (Cu(II), Pb(II) and Zn(II)) in wide potential window were simultaneously detected on tin film/gold nanoparticles/gold microelectrode (Sn/GNPs/gold microelectrode) by the method of square wave stripping voltammetry. The Sn/GNPs/gold microelectrode was fabricated by in situ plating of a Sn film on a gold nanoparticles (GNPs) modified gold microelectrode. The influence of hydrogen overflow on stripping of Zn(II) on the gold microelectrode was reduced by modification of GNPs, which made the stripping potential of target metals shift positively. The interference of sulfhydryl groups was reduced and the selectivity of the microelectrode was improved due to the addition of Sn in the detection solution. After accumulation at −1.4 V for 300 s in acetate buffer solution (0.1 mol L−1, pH 4.5), the Sn/GNPs/gold microelectrode revealed a good linear behavior in the examined concentration ranges from 5 to 500 µg L−1 for Cu(II) and Pb(II), and from 10 to 500 µg L−1 for Zn(II), with a limit of detection of 2 µg L−1 for Cu(II), 3 µg L−1 for Pb(II) and 5 µg L−1 for Zn(II) (S/N=3). When compared with a Sb/GNPs/gold microelectrode and a Bi/GNPs/gold microelectrode, the Sn/GNPs/gold microelectrode showed the best stripping performance to Cu(II), Pb(II) and Zn(II). As a new type of environment‐friendly electrode, the Sn/GNPs/gold microelectrode has potential applications for detection of heavy metals.

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Characterization of ultramicroelectrode arrays combining electrochemical techniques and optical microscopy imaging

Cited by 34 publications

References 28 publications

Electrochemical Performance of Self‐Assembled Monolayer Gold Nanoparticle‐Modified Ultramicroelectrode Array Architectures

Electrochemical Performance of Self‐Assembled Monolayer Gold Nanoparticle‐Modified Ultramicroelectrode Array Architectures

Cost-effective smartphone-based reconfigurable electrochemical instrument for alcohol determination in whole blood samples

Simultaneous Detection of Copper, Lead and Zinc on Tin Film/Gold Nanoparticles/Gold Microelectrode by Square Wave Stripping Voltammetry

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