Reduced graphene oxide nanosheets and gold nanoparticles covalently linked to ferrocene-terminated dendrimer to construct electrochemical sensor with dual signal amplification strategy for ultra-sensitive detection of pesticide in vegetable

Lü, Yan; Yan, Xinrui; Liu, Hongli; Zhang, Xuefei; Wang, Meng; Fu, Shifeng; Zhang, Guangtian; Cheng, Qian; Yang, Hongyu; Han, Jinyan; Xiao, Fang

doi:10.1016/j.microc.2020.105016

Cited by 35 publications

(12 citation statements)

References 58 publications

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“…The synthesis and detection of the analyte are schematically presented in Figure 7. [113] The electrochemical sensor presented a low LOD of 0.21 μmol L À 1 for dichlorvos and a fast response time of 1.8 s (Figure 7 (B)). The FcDr dendrimers contributed to the formation of carboxyl groups, which facilitated the formation of covalent bonds between AuNPs and rGO, and therefore, contributed to the excellent performance of the device.…”

Section: Redox Mediators and (Bio)moleculesmentioning

confidence: 96%

“…Fc conferred structures such as rGOÀ Fc and rGOÀ Fc(COOH) rigid surfaces by creating nano-sized channels; moreover, rGOÀ Fc(COOH) 2 presented higher conductivity than other materials. More recently, Yan et al [113] fabricated an electrochemical sensor consisting of AuNPs, rGO, and a Fc dendrimer with poly (amine)-ester (FcDr) for the ultra-sensitive detection of dichlorvos (2,2-dichlorovinyl-dimethyl phosphate), an organophosphate pesticide. The authors combined the characteristics of FcDr (good molecular receptor/sensor, self-organizing structure, high electrode adhesion, and still having a natural redox probe, Fc 2 + /Fc), with the abilities of AuNPs and rGO to amplify the signal that enhanced the charge transfer process between the electrode and the analyte.…”

Section: Redox Mediators and (Bio)moleculesmentioning

confidence: 99%

“…Here FcDr, and rGO, GCE denote ferrocene dendrimer with poly(amine)-ester, reduced graphene oxide, and glassy carbon electrode. Reprinted with permission from Ref [113]…”

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confidence: 99%

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Structure, Properties, and Electrochemical Sensing Applications of Graphene‐Based Materials

et al. 2020

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Owing to their versatility and unique characteristics, graphene‐based materials have been used extensively for the development of electrochemical sensors and biosensors. The key to the maximum potential of these materials is the understanding of the role their structure plays in their modification processes. Herein, we summarize some structural characteristics of graphene oxide (GO) and reduced graphene oxide (rGO) and explore different surface modification methods for electrochemical sensing applications. surveyed the most recent applications of these materials as (bio)sensors, particularly for environmental monitoring and health‐related applications, such as quantification of biomarkers and metabolites and detection of cancer cells. The low detection limits, selectivity toward target molecules, and robustness of GO‐ and rGO‐based electrodes render them critical materials for the preparation of sensors for routine analysis and monitoring.

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Section: Redox Mediators and (Bio)moleculesmentioning

confidence: 96%

Section: Redox Mediators and (Bio)moleculesmentioning

confidence: 99%

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Structure, Properties, and Electrochemical Sensing Applications of Graphene‐Based Materials

et al. 2020

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“…With a response time of 1.8 s and a low DL of 0.21 µM, increased electrical as well as catalytic performance was attained. A DR of 0.43–218.40 µM was accomplished while maintaining a low DL [ 112 ]. Facure et al studied the reduction of by the addition of conductive organic polymers (PEDOT:PSS and polypyrrole) and Au NPS.…”

Section: 2dms-based Composite For Electrochemical Detection Of Pestic...mentioning

confidence: 99%

Emerging Two-Dimensional Materials-Based Electrochemical Sensors for Human Health and Environment Applications

et al. 2023

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Two-dimensional materials (2DMs) have been vastly studied for various electrochemical sensors. Among these, the sensors that are directly related to human life and health are extremely important. Owing to their exclusive properties, 2DMs are vastly studied for electrochemical sensing. Here we have provided a selective overview of 2DMs-based electrochemical sensors that directly affect human life and health. We have explored graphene and its derivatives, transition metal dichalcogenide and MXenes-based electrochemical sensors for applications such as glucose detection in human blood, detection of nitrates and nitrites, and sensing of pesticides. We believe that the areas discussed here are extremely important and we have summarized the prominent reports on these significant areas together. We believe that our work will be able to provide guidelines for the evolution of electrochemical sensors in the future.

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“…Electrodes modified with reduced graphene oxide (rGO) and gold nanoparticles (AuNPs) are well-known devices for the fabrication of electrochemical sensors [17][18][19]. The oxygenated functional groups existing in rGO allow interaction with the target analyte.…”

Section: Introductionmentioning

confidence: 99%

A Simple, sensitive, and selective electrochemical aptasensor for cortisol based on rGO‐AuNPs

2023

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Cortisol is a steroid hormone naturally produced by the adrenal glands. It participates in and controls several processes in the body and is considered an important physiological biomarker. Due to its very low concentrations in body fluids, its detection requires high sensitivity and specificity. Here, we present a simple electrochemical biosensor based on reduced graphene oxide (rGO) modified with gold nanoparticles (AuNPs) for the immobilization of the cortisol‐specific aptamer (Ap) (MCH‐Ap‐AurGO/GCE). Important analytical parameters for identifying the target analyte were optimized, such as conditions and amount of immobilized Ap, the influence of the concentration and nature of the supporting electrolyte, pH of the medium, and incubation time. The optimized conditions for the aptasensor were: concentration of Ap 1.0 × 10−6 mol L−1, support electrolyte Tris/HCl 50 mmol L−1, MgCl2 10 mmol L−1, and NaCl 10 mmol L−1, at pH 5.0 and incubation time of 15 min. A linear response range was obtained from 1 × 10−18 up to 1 × 10−11 mol L−1 of cortisol with a detection limit (LOD) of 1.0 × 10−18 mol L−1. A curve adjusted for operational purposes in the saliva sample was fitted for the concentration range between 0.5 × 10−14 and 1 × 10−11 mol L−1, with a linear regression equation ΔRtc/Rtc1 = 2.70 + 0.17 × log([Cortisol]). The aptasensor demonstrated a great potential for detecting cortisol in a simple, fast, and highly sensitive way, opening its path for application in real samples, which present levels below the concentration in which cortisol is commonly found in body fluids.

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Reduced graphene oxide nanosheets and gold nanoparticles covalently linked to ferrocene-terminated dendrimer to construct electrochemical sensor with dual signal amplification strategy for ultra-sensitive detection of pesticide in vegetable

Cited by 35 publications

References 58 publications

Structure, Properties, and Electrochemical Sensing Applications of Graphene‐Based Materials

Structure, Properties, and Electrochemical Sensing Applications of Graphene‐Based Materials

Emerging Two-Dimensional Materials-Based Electrochemical Sensors for Human Health and Environment Applications

A Simple, sensitive, and selective electrochemical aptasensor for cortisol based on rGO‐AuNPs

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