Shape Characteristics of Complex Single Chain and Aggregation by Exponential Law

Li, Tao; Lu, Dan

doi:10.6023/a16050252

Cited by 6 publications

(8 citation statements)

References 28 publications

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“…The optimal concentration of Bi obtained for the highest stripping peak of Pb was 500 ppb, and above this value, a decrease in the current signal was appreciated suggesting that Bi would compete with Pb at deposition process [89]. Similar behavior appeared in other studies which uses MWCNT-Nafion [87] or Graphene-Nafion [90] composites. The peak currents of CNT-CS-SDS electrodes were in all cases higher than the CNT-SDS electrodes ( Figure 6A), for this reason we selected CNT-CS-SDS electrodes for the future determinations.…”

Section: Pb Determinationsupporting

confidence: 69%

Low Cost Layer by Layer Construction of CNT/Chitosan Flexible Paper‐based Electrodes: A Versatile Electrochemical Platform for Point of Care and Point of Need Testing

2018

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Modification of cellulosic paper with carbon nanotubes (CNT) was studied for the development of electronic and analytical devices. Interesting results were published by using a CNT aqueous solution and the capillary forces of filter paper to make conductive tracks, supercapacitors, potentiometric electrodes and chemometric sensors. In this report, we show for the first time an electrochemical characterization of CNT‐CS‐SDS paper electrodes constructed with an ink containing optimized proportions of multi‐wall CNT, chitosan (CS) and sodium dodecyl sulfate (SDS), and we compared our data with CNT‐SDS paper electrodes constructed with a previously reported ink. We achieved better reversibility (ΔE=131±14 mV, CVs) and reproducibility (RSD=3.63 %) with CNT‐CS‐SDS paper electrodes, when compared to CNT‐SDS paper electrodes (ΔE=249±7 mV; RSD=6.8 %) used as controls. When electrodes were fold at 90° angle, CNT‐CS‐SDS paper electrodes showed lower RSD than CNT‐SDS paper electrodes, 8.43 % and 21.5 % respectively. These results are in concordance with SEM analysis indicating a dense CS film in CNT‐CS‐SDS paper electrodes. As a proof of concept, we determine dopamine concentration by DPV in the presence of ascorbic and uric acids, the limit of detection calculated was 6.32 μM. Moreover, a bismuth‐film was prepared by in situ plating of Bi into CNT‐CS‐SDS paper electrodes. ASV allowed us to detect Pb in the presence of Bi (10–200 ppb) with a limit of detection of 6.74 ppb.

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Section: Pb Determinationsupporting

confidence: 69%

Low Cost Layer by Layer Construction of CNT/Chitosan Flexible Paper‐based Electrodes: A Versatile Electrochemical Platform for Point of Care and Point of Need Testing

2018

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“…For the aggregations with a fractal structure, they have a denser chain packing structure if the fractal dimension (d f ) value is higher. 48,49 In the work, the excess scattering intensity I(q) and related scattering vector q were measured in P7DPF solutions with different chloroform ratios (0−50%), and the fractal dimensions were obtained from the linear relationship between log I(q) and log q. Figure 6 shows the plots of log I(q) vs log q for samples with chloroform ratio from 0% to 50%; the solid lines were linear fitted.…”

Section: Resultsmentioning

confidence: 99%

“…For the aggregation with a fractal characteristic by small particles, its scattering intensity I ( q ) was a function of scattering wave vector q according to I ( q ) ∝ q – d f . The parameter q was in the range of R agg > q –1 > R g , where R agg and R g are the radius of gyration for the aggregations and single chain, respectively. − Here, the range of q was calculated to be in 12.6 μm –1 < q < 28.7 μm –1 when the angle was in the range 50°–150°. In DLS, the normalized scattering intensity autocorrelation function g 2 ( t ) was measured, where t is the decay time.…”

Section: Methodsmentioning

confidence: 99%

Effect of Solvent on the Solution State of Conjugated Polymer P7DPF Including Single-Chain to Aggregated State Structure Formation, Dynamic Evolution, and Related Mechanisms

Zhang

Liu

et al. 2020

Macromolecules

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The effect of solvent on the bulky polydiarylfluorene poly[4-(n-alkoxy)-9,9-diphenylfluoren-2,7-diyl]-co-[5-(n-alkoxy)-9,9-diphenylfluoren-2,7-diyl] (P7DPF) solution state including single-chain to aggregated structure formation, dynamic evolution, and related mechanism was investigated by static/dynamic laser light scattering (DLS/SLS), UV absorption spectroscopy, transmission electron microscopy (TEM), and so on. It was found that solvent had a great influence on the formation of P7DPF β conformation and aggregation state structure. P7DPF aggregation could be well dissolved into single chains (α conformation) in a good solvent (chloroform). But in a relatively poor solvent (toluene), only the α conformation was dissolved; the β conformation could stably exist in the aggregation with size about 100 nm even after being heated at a high temperature (343 K) and ultrasonic oscillation. Interestingly, in the mixed solution of adding different ratio chloroform into toluene solution, although the size of aggregation was unchanged before adding 40% chloroform, the size was dramatically dropped after adding 50% chloroform. In this process, the content of the β conformation, interchain packing density, and chain orderliness in aggregation were gradually reduced. Those results suggested that solvent can greatly impact chain aggregated structure formation and dynamic evolution. The related mechanism was revealed. The research is of great significance not only to understand the correlation among solvent/P7DPF chains interaction, solution behavior, and device performance but also to understand the physical essence of enhancing photoelectric performance to well control conjugated polymer condensed state structure in application for conjugated polymer-based film optoelectronic devices. The obtained conclusions can help to understand other conjugated polymer systems.

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“…www.small-journal.com focused on new electrode materials for ASV applications. With nanoparticles, [140][141][142][143][144][145][146][147] nanofi bers, [ 148 ] CNTs, [149][150][151][152][153][154][155][156][157] graphene, [158][159][160] titanate nanosheets, [ 161 ] and nanocomposites, [162][163][164][165][166][167][168][169][170][171][172][173][174][175][176][177] non-toxic electrodes have been widely studied in heavy metal ion detection. The nanomaterial-based electrodes have a high effi ciency in pre-concentration and deposition of metal ions and show high catalytic activity in stripping tests.…”

Section: Heavy Metal Detectionmentioning

confidence: 99%

Nanomaterial‐enabled Rapid Detection of Water Contaminants

Mao

Chang

Zhou

et al. 2015

Small

112

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Water contaminants, e.g., inorganic chemicals and microorganisms, are critical metrics for water quality monitoring and have significant impacts on human health and plants/organisms living in water. The scope and focus of this review is nanomaterial-based optical, electronic, and electrochemical sensors for rapid detection of water contaminants, e.g., heavy metals, anions, and bacteria. These contaminants are commonly found in different water systems. The importance of water quality monitoring and control demands significant advancement in the detection of contaminants in water because current sensing technologies for water contaminants have limitations. The advantages of nanomaterial-based sensing technologies are highlighted and recent progress on nanomaterial-based sensors for rapid water contaminant detection is discussed. An outlook for future research into this rapidly growing field is also provided.

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Shape Characteristics of Complex Single Chain and Aggregation by Exponential Law

Cited by 6 publications

References 28 publications

Low Cost Layer by Layer Construction of CNT/Chitosan Flexible Paper‐based Electrodes: A Versatile Electrochemical Platform for Point of Care and Point of Need Testing

Low Cost Layer by Layer Construction of CNT/Chitosan Flexible Paper‐based Electrodes: A Versatile Electrochemical Platform for Point of Care and Point of Need Testing

Effect of Solvent on the Solution State of Conjugated Polymer P7DPF Including Single-Chain to Aggregated State Structure Formation, Dynamic Evolution, and Related Mechanisms

Nanomaterial‐enabled Rapid Detection of Water Contaminants

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