Gold Triangular Nanoprisms and Nanodecahedra: Synthesis and Interaction Studies with Luminol toward Biosensor Applications

Selvaraj, N.; Mangalaraja, Ramalinga Viswanathan; Wu, Jerry J.; Asiri, Abdullah M.; Anandan, Sambandam

doi:10.1021/acs.langmuir.6b02976

Cited by 11 publications

(14 citation statements)

References 52 publications

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“…The changes in the UV−vis spectra of the colloidal solution of Au NP−Pir in comparison with the Pir solution can propose the donation of the lone electron pairs of the O amide and N pyridyl atoms to the Au NPs surface (i.e., a charge transfer from Pir to the Au surface). 55,56 In the visible region, the absorption spectra show the characteristic plasmon band of Au NPs around 520 nm, which is consistent with previous reports (Figure 2). 35 This band does not show any significant change in its original wavelength, which indicates that the agglomeration of Au NPs can be avoided in the Au NP−Pir conjugated colloid.…”

Section: Resultssupporting

confidence: 92%

“…where f a is the fraction of accessible fluorescence and K a is the effective quenching constant, which is analogous to the associative binding constant for the quencher−acceptor system. 56 A plot of F 0 /(F 0 − F) versus [Q] −1 , shown in Figure S6 of the Supporting Information, gives a straight line, where the value of K a can be calculated from the ratio of the intercept and slope. The value of K a was found to be 3.1 × 10 8 M −1 .…”

Section: = +mentioning

confidence: 99%

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Combined Experimental and Computational Study of the In Situ Adsorption of Piroxicam Anions on the Laser-Generated Gold Nanoparticles

et al. 2017

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Gold nanoparticle–piroxicam anion conjugates (Au NP–Pir) were synthesized in a green method using laser ablation of a gold foil in an aqueous solution of anionic piroxicam (NaPir). The produced Au NP–Pir conjugates were characterized by different spectroscopic techniques and transmission electron microscopy. The fluorescence and absorption spectra of Au NP–Pir colloidal solution were recorded at different concentrations of the Au NPs to investigate the effect of conjugation on the spectral properties of both the free Pir anion and Au NPs. Comparing the FT-IR spectrum of the colloidal solution of Au NP–Pir with that of the solution of the free Pir anion indicates that this anion binds to the surface of Au NPs through its different binding sites, viz., the pyridyl nitrogen atom, the SO2 group, and the amide oxygen atom. To support the experimental observations, theoretical calculations were also performed to evaluate the interaction of different binding sites of Pir with one Au atom and the effect of this interaction on the IR spectrum of Pir. In a more realistic theoretical study, the optimized geometry of Pir on the Au(111) surface was calculated, and its orientation toward the surface of Au was obtained. The calculations show that the pyridyl ring of Pir prefers to orient perpendicular to the surface of Au, and the O atoms of the SO2 and amide groups are responsible for the interaction with the surface. The cytotoxic effect of the free Pir anion and Au NP–Pir conjugates against the Jurkat T-cells was studied using an MTT assay. The results show that only the Au NP–Pir conjugates have significant anticancer activity against the Jurkat T-cells with an IC50 value of 33.8 ± 2 μg/mL. In comparison with the pure Au NPs and free Pir, the Au NP–Pir conjugates show a significant antimicrobial activity against two pathogens including Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus).

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Section: Resultssupporting

confidence: 92%

Section: = +mentioning

confidence: 99%

Combined Experimental and Computational Study of the In Situ Adsorption of Piroxicam Anions on the Laser-Generated Gold Nanoparticles

et al. 2017

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“…Understanding these mysterious mechanisms for CQD light emission in solutions, solids, and at interfaces will assist in the optimal implementation of CQDs in optoelectronic and sensing applications. To this end, ECL attracts interest, where redox properties are exploited to yield light from iTMCs, , QDs, − polymer systems, and organic molecules, , all in solution and/or film|solution interfaces. Additionally, the electrode can be either a cathode or an anode, allowing emissions originating from the anionic or cationic radicals of luminophores, respectively, to mimic the operations of cathodic and anodic regions in optoelectronics.…”

Section: Introductionmentioning

confidence: 99%

Electrochemiluminescence and Photoluminescence of Carbon Quantum Dots Controlled by Aggregation-Induced Emission, Aggregation-Caused Quenching, and Interfacial Reactions

et al. 2020

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Carbon quantum dots (CQDs) show promise in optoelectronics as a light emitter due to simple synthesis, biocompatibility and strong tunable light emissions. However, CQDs commonly suffer from aggregation caused quenching (ACQ), inhibiting the full potential of these light emitters. Studies into different ideal light emitters have shown enhancements when converting common ACQ effects to aggregation induced emission (AIE) effects. We report CQD synthesis using citric acid and high/ low thiourea concentrations, or sample 2/1. These two CQDs exhibited AIE and ACQ PL effects, respectively. CQD characterizations and photoluminescence interrogations of CQD films and solutions revealed that these unique emission mechanisms likely arose from different S incorporations into the CQDs. Furthermore, it was discovered that sample 2 emitted electrochemiluminescence (ECL) more intensely than sample 1 in a homogenous solution with S 2 O 8 2− as a coreactant, due to aggregation and interactions of CQD species in solution. Very interestingly, sample 1's CQD film| S 2 O 8 2− system achieved an ECL efficiency of 26% and emitted roughly 26 times more efficiently than sample 2 in the same conditions. Predominant interfacial reactions and surface state emission produced intense white light with a correlated color temperature of 2000 K. Spooling ECL spectroscopy was utilized to investigate emission mechanisms. Sample 2's CQD film|TPrA system had four times higher ECL intensity than that of sample 1, most likely due to π-cation interactions leading to a strong CQD •+ stability, thereby, enhancing ECL. It is anticipated that ECL enhancement of CQD films or solutions by means of AIE will lead to wide CQD optoelectronic applications.

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Section: Agnps and Aunps: Synthesis And Propertiesmentioning

confidence: 99%

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confidence: 99%

Gold and Silver Nanoparticle-Based Colorimetric Sensors: New Trends and Applications

et al. 2021

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Gold and Silver nanoparticles (AuNPs and AgNPs) are perfect platforms for developing sensing colorimetric devices thanks to their high surface to volume ratio and distinctive optical properties, particularly sensitive to changes in the surrounding environment. These characteristics ensure high sensitivity in colorimetric devices. Au and Ag nanoparticles can be capped with suitable molecules that can act as specific analyte receptors, so highly selective sensors can be obtained. This review aims to highlight the principal strategies developed during the last decade concerning the preparation of Au and Ag nanoparticle-based colorimetric sensors, with particular attention to environmental and health monitoring applications.

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Gold Triangular Nanoprisms and Nanodecahedra: Synthesis and Interaction Studies with Luminol toward Biosensor Applications

Cited by 11 publications

References 52 publications

Combined Experimental and Computational Study of the In Situ Adsorption of Piroxicam Anions on the Laser-Generated Gold Nanoparticles

Combined Experimental and Computational Study of the In Situ Adsorption of Piroxicam Anions on the Laser-Generated Gold Nanoparticles

Electrochemiluminescence and Photoluminescence of Carbon Quantum Dots Controlled by Aggregation-Induced Emission, Aggregation-Caused Quenching, and Interfacial Reactions

Gold and Silver Nanoparticle-Based Colorimetric Sensors: New Trends and Applications

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