Flexible paper-based Ag dendritic SERS chips for rapid in situ detection of thiram residues on pear skin

RSC Advances, Год журнала: 2024, Номер 14(50), С. 36960 - 36969

Опубликована: Янв. 1, 2024

In this study, we developed a flexible, paper-based Ag dendritic SERS chip with high sensitivity, reliability and practicality. The was applied to analyze thiram residue on pear skin using the novel “paste peel-off” technique.

Язык: Английский

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Flexible, Ultrasensitive and High-practical Paper/f-TiO2/Ag SERS Chips for On-site, Rapid and Accurate Detection of Tricyclazole Pesticide in Agricultural Products

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Май 22, 2024

Surface-enhanced Raman scattering (SERS) sensing is a powerful and important analytical technique in agriculture food. Designing flexible SERS substrates that ensure both high sensor efficiency feasibility field analysis highly desirable as it can bring the closer to practical applications. Here, we demonstrate designed Paper/f-TiO₂/Ag structure, flexible, ultrasensitive, chip, created by enhancing self-assembly of Ag nanoparticles on cellulose fiber matrix through bridging smart functionalized TiO₂ nanomaterial (f-TiO₂), which demonstrates superior detection capability for hazardous plant protection agent tricyclazole (TCZ) crops using an advanced, simple, efficient technique. Despite its straightforward fabrication process via solvent immersion method, intrinsic surface properties material – hydrophilic hydrophobic enable uniform dense (NPs) paper substrate. This innovative design provides TCZ molecules with limit reaching 2.1 × 10^-9 M, remarkable improvement compared Paper/Ag lacking f-TiO₂ nanomaterials, register at 10^-5 M. substrate also exhibits very reliability indicated excellent reproducibility repeatability relative standard deviations (RSD) only 5.93% 4.73%, respectively. Characterized flexibility water-attractive yet non-soluble surface, chips offer convenience direct into sample, facilitating seamless target molecule collection while circumventing interference signals. Termed "dip dry" technique, advantages are indisputable, boasting in-situ deployment, simplicity, efficiency, minimizing signals negligible levels. Through application this advanced have successfully detected two high-value crops, ST25 rice, dragon fruit, achieving recovery values ranging from 90 128%. underscores immense potential ensuring food quality safety. As proof concept, chips, simple process, one step applications beyond laboratory.

Язык: Английский

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DC vs AC Electrokinetics-Driven Nanoplasmonic Raman Monitoring of Charged Analyte Molecules in Ionic Solutions

The Journal of Physical Chemistry C, Год журнала: 2024, Номер 128(36), С. 15103 - 15116

Опубликована: Авг. 31, 2024

Electrokinetic surface-enhanced Raman spectroscopy (EK-SERS) is an emerging high-order analytical technique that combines the plasmonic sensitivity of SERS with electrode interfacial molecular control electrokinetics. However, previous EK-SERS works primarily focused on non-Faradaic direct current (DC) operation, limiting understanding underlying mechanisms. Additionally, developing reliable devices electrically connected hotspots remains challenging for achieving high and reproducibility in measurements. In this study, we investigated use two-tier nanolaminate nano-optoelectrode arrays (NL-NOEAs) DC alternating (AC) measurements charged analyte molecules ionic solutions. The NL-NOEAs consist Au/Ag/Au multilayered nanostructures conductive nanocomposite nanopillar (NC-NPAs). We demonstrate exhibit enhancement factors (EFs) ∼10

Язык: Английский

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Time-Resolved Spatial Distributions of Individual Components of Electroactive Films during Potentiodynamic Electrodeposition

ACS Physical Chemistry Au, Год журнала: 2024, Номер 4(6), С. 615 - 619

Опубликована: Сен. 3, 2024

Of the attributes that determine performance of electroactive film-based devices, least well quantified and understood is spatial distribution component species. This critical since it dictates transport rates all mobile species (electrons, counterions, solvent, analyte, reactant) film mechanical properties (as exploited in actuator devices). One few techniques able to provide individual population profiles situ specular neutron reflectivity (NR). Historically, this information obtained at cost poor time resolution (hours). Here we show how NR measurements with event mode data acquisition enable both temporal resolution; latter can be selected postexperiment varied during transient. We profile "buried" interfaces under dynamic electrochemical conditions polypyrrole electrodeposition Cu deposition/dissolution. In case polypyrrole, homogeneous throughout growth; there no evidence dendrite formation followed by solvent (water) displacement. Correlation NR-derived thickness coulometric assay allows calculation volume fraction, ϕS = 0.48. a deep eutectic complexing nature medium results time-dependent metal speciation: mechanistically, dissolution does not simply follow deposition pathway reverse.

Язык: Английский

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A simulation-based analysis of optical read-out for electrochemical reactions using composite vortex beams

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Сен. 27, 2024

Язык: Английский

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The Analysis of Vibrational Spectra: Past, Present and Future

ChemPlusChem, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 11, 2024

Vibrational spectroscopy can be said to have started with the seminal work of Coblentz in 1900s, who recorded first recognisable infrared spectra. Today, vibrational is ubiquitous and there are many ways measure a spectrum. But this usually only step, almost always need assign resulting spectra: "what property system results feature at energy"? How question has been answered changed over last century, as our understanding fundamental physics matter evolved. In Perspective, I will present my view how analysis spectra evolved time. The article divided into three sections: past, future. "past" section consists very brief history spectroscopy. "present" centered around ab initio studies, particularly density functional theory (DFT) describe become routine. For "future", extrapolate current trends also speculate what might come next.

Язык: Английский

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Sum-Frequency Generation Spectroscopy at Aqueous Electrochemical Interfaces

Symmetry, Год журнала: 2024, Номер 16(12), С. 1699 - 1699

Опубликована: Дек. 21, 2024

The electrochemical interface (EI) is the determining factor in yield and mechanism of sustainable energy storage conversion systems due to its intrinsic functionality as a dynamic junction with symmetry breaking molecular arrangement for complex reaction fields mass transport heterogeneous electron transfer. At EI, externally applied potential stimulus drives formation electrical double layer (EDL) governs adsorption interfacial adsorbate species aqueous electrolyte solutions. Water are integral quintessential elements technological innovation various such environmental sciences, electrocatalysis, photocatalysis, biochemistry. Although deciphering structure orientation water molecules at electrode–electrolyte quantitative analysis utmost importance, assessing chemical phenomena buried EI was rather challenging intricacy selecting interface-specific methodologies. Based on non-centrosymmetry interfaces’ electronic properties, sum-frequency generation (SFG) spectroscopy has been manifested be specifically well suited probing detailed comprehensive characteristics adsorbates’ structures events. In this review, we holistically engage methodical scrupulous assessment fundamental EDL models navigate towards connection renowned Stark effect dependence SFG spectra interfaces. We dissect development, advantages, available geometrical configurations situ harnessing EI. A broad spectrum applications unraveling orientations rationalizing convoluted fuel-generated electrocatalytic reactions particular encumbrances resolutions underscored by leveraging spectroscopy.

Язык: Английский

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Nanocavity-based single-molecule plasmon-enhanced Raman spectroscopy: Features and advancements

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Год журнала: 2024, Номер 330, С. 125664 - 125664

Опубликована: Дек. 25, 2024

Язык: Английский

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