Uniform honeycomb CNT-microparticles prepared via droplet-microfluidics and sacrificial nanoparticles for electrochemical determination of methyl parathion

Yao, Jiyuan; Liu, Zhenping; Jin, Mingliang; Zou, Yiying; Chen, Jiamei; Xie, Peng; Wang, Xin; Akinoglu, Eser Metin; Zhou, Guofu; Shui, Lingling

doi:10.1016/j.snb.2020.128517

Cited by 33 publications

(9 citation statements)

References 39 publications

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“…As Fig. S4† shows, with the pH value increasing, the anodic peak shifted to the negative potential, which agreed with the previous publications, 11,41 indicating that the deprotonation may have facilitated electron transfer with lower peak potential. What is more, a linear relationship between the peak potential and the pH value was observed with a regression equation of E pc (mV) = −58.96 pH − 115.88 ( R 2 = 0.998).…”

Section: Resultssupporting

confidence: 91%

“…Furthermore, the electroactive surface areas (ECSA) of the modified electrodes were calculated using the Randles–Sevcik equation: 41 I p = 2.69 × 10 5 × A × n 3/2 × c × D 1/2 × v 1/2 where I p (A) is the anodic current peak, A (cm 2 ) is the active surface area, n is the number of electrons transferred in the electrochemical reaction, c (mol cm −3 ) is the concentration of the electroactive species, v (V s −1 ) is the scan rate and D is the diffusion coefficient ( D = 7.6 × 10 −6 cm 2 s −1 for [Fe(CN) 6 ] 3−/4− ). Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Overall, the PtNPs/UiO-66-NH 2 /MWCNTs/GCE showed a much larger ECSA, which is comparable to that of the previously reported MWCNT-based electrodes. 41 In conclusion, the PtNPs/UiO-66-NH 2 /MWCNTs increased the active area, accelerated signicantly electron transfer rate, and eventually enhanced the electrochemical reaction on the modied electrode, thus quite promising for electrochemical sensing applications.…”

Section: Electrochemical Characterization Of Different Modied Gcesmentioning

confidence: 86%

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Rational design of a novel MOF-based ternary nanocomposite for effectively monitoring harmful organophosphates in foods and the environment

Wang

Guo³

et al. 2023

Anal. Methods

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Characterization Of Different Modied Gcesmentioning

confidence: 86%

See 1 more Smart Citation

Rational design of a novel MOF-based ternary nanocomposite for effectively monitoring harmful organophosphates in foods and the environment

Wang

Guo³

et al. 2023

Anal. Methods

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“…Hitherto, many analytical methods including enzyme-linked immunosorbent assays, , gas chromatography–mass spectrometry, high-performance liquid chromatography, and electrochemical methods , have been established to detect OPs. However, it is regrettable that these methods are somewhat insufficient.…”

Section: Introductionmentioning

confidence: 99%

Capsulation of AuNCs with AIE Effect into Metal–Organic Framework for the Marriage of a Fluorescence and Colorimetric Biosensor to Detect Organophosphorus Pesticides

et al. 2021

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Organophosphorus pesticides (OPs) can inhibit the activity of acetylcholinesterase (AChE) to induce neurological diseases. It is significant to exploit a rapid and sensitive strategy to monitor OPs. Here, a metal–organic framework (MOF) acted as a carrier to encapsulate AuNCs, which can limit the molecular motion of AuNCs, trigger the aggregation-induced emission (AIE) effect, and exhibit a strong fluorescence with a fluorescence lifetime and quantum yield of 6.83 μs and 4.63%, respectively. Then, the marriage of fluorescence and colorimetric signals was realized on the basis of the dual function of the enzymolysis product from AChE and choline oxidase (CHO) on AuNCs@ZIF-8. First, it can decompose ZIF-8 to weaken the restraint on AuNCs, and thus the fluorescence receded. Second, it can be used as a substrate for the peroxidase mimics of the released AuNCs to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) and a visible blue appeared. Thus, on the basis of the inhibition of AChE activity by OPs, a fluorescence–colorimetric dual-signal biosensor was established. In addition, colorimetric paper strips were exploited to realize a visual semiquantitative detection, and a smartphone APP was developed to make the visualization results more precise and realize real-time supervision of pesticide contamination.

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“…Since stable dispersions of CNTs have a limited concentration range in most solvents, even if surface functionalization or surfactants are used to improve solubility (for instance, oxidised multiwalled CNTs (oxMWNTs) in water start to gel around 0.5 vol% [33] ), the solidification of a compact secondary microparticle from a dilute droplet tem plate is challenging. The most common method of forming solid microparticles with a high CNT content and homoge neous internal structure is through the gradual evaporation of the droplet phase solvent from waterinoil (W/O) emulsion templates, [16,18,21] although the extraction of water into the con tinuous phase solvent [9] has also been explored. While evapora tion clearly takes place at an airemulsion interface, the exact mechanism by which water is transported out of droplet tem plates and to this interface is often not well understood.…”

Section: Introductionmentioning

confidence: 99%

Controlled Fabrication of Carbon Nanotube Microspheres from Emulsion Templates: Exploring the Dynamics of Solvent Loss and Nanoparticle Assembly

Sanders

Volder

2022

Adv Materials Inter

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The use of emulsions as templates for nanomaterial assembly is a versatile method to create controlled microstructures. However, production rates are often low, particularly where the droplet phase solvent must be removed to achieve consolidation. Here, the emulsion templated fabrication of microparticles from multi‐walled carbon nanotubes (CNTs) is studied. As an exemplar primary nanoparticle for microparticle assembly, CNTs present particular challenges due to their strong inter‐particle interactions and limited dispersion in solvents. Nevertheless, small batches of CNT microparticles have demonstrated promising performances in energy storage, environmental remediation, and sensing due to their controlled structures. Improving CNT microparticle production through emulsion processing is therefore interesting to promote these real‐world applications. In this work, it is shown that the slow rate of CNT microparticle formation from water‐in‐oil emulsions is due to spontaneous emulsification. Then methanol‐in‐oil emulsions are tested, which rapidly form fragile CNT capsules. Using mixtures of methanol and water, a faster rate of solvent loss can be balanced alongside nanoparticle assembly; CNT microparticle formation is up to twice as fast using 40% methanol compared to aqueous dispersions. In addition to facilitating faster CNT microparticle production, these findings offer more broadly applicable insights into the mechanisms of solvent transport in emulsions.

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Uniform honeycomb CNT-microparticles prepared via droplet-microfluidics and sacrificial nanoparticles for electrochemical determination of methyl parathion

Cited by 33 publications

References 39 publications

Rational design of a novel MOF-based ternary nanocomposite for effectively monitoring harmful organophosphates in foods and the environment

Rational design of a novel MOF-based ternary nanocomposite for effectively monitoring harmful organophosphates in foods and the environment

Capsulation of AuNCs with AIE Effect into Metal–Organic Framework for the Marriage of a Fluorescence and Colorimetric Biosensor to Detect Organophosphorus Pesticides

Controlled Fabrication of Carbon Nanotube Microspheres from Emulsion Templates: Exploring the Dynamics of Solvent Loss and Nanoparticle Assembly

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