Role of Silver Nanoclusters in the Enhanced Photocatalytic Activity of Cerium Oxide Nanoparticles

Samai, Boby; Chall, Sayantani; Mati, Soumya Sundar; Bhattacharya, Sumanta

doi:10.1002/ejic.201800230

Cited by 20 publications

(8 citation statements)

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“…Photocatalytic activity. Metal NCs have been studied as catalytic systems in different types of reactions such as CO oxidation, selective oxidation, selective hydrogenation, organic reactions, electrocatalytic 17,45 , and photocatalytic reactions 11,[46][47][48][49][50][51] . These processes have been mainly explored for gold NCs.…”

Section: High Resolution and Corrected Electron Microscopy Analysismentioning

confidence: 99%

“…Particularly, for the case of Ag NCs, several researches have been performed regarding the organic molecules degradation through photocatalysis. Samai et al 50 showed that catalytic activity of Ag NCs supported CeO 2 NPs was enhanced 80% in relation to CeO 2 NPs, to degrade acridine red. El-Roz et al 51 encapsulated Ag NCs in the pores of zeolite NPs to photocatalyze formic acid to H 2 and CO 2 under visible light.…”

Section: High Resolution and Corrected Electron Microscopy Analysismentioning

confidence: 99%

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Highly fluorescent few atoms silver nanoclusters with strong photocatalytic activity synthesized by ultrashort light pulses

Santillán

Arboleda

Muraca

et al. 2020

Sci Rep

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While there are conventional chemical synthesis methods to generate metal nanoclusters (NCs), many of them are adversely affected by the unavoidable contamination of the nanoproduct solution, resulting in aggregation, background noise in analytical chemistry, toxicity, and deactivation of the catalyst. In this work, physical method of ultrafast laser ablation as a "green" synthesis approach together with mechanical centrifugation to obtain silver NCs, simplifying widely the chemical synthesis requirements, is proposed. Remarkably, compared with conventional methods for synthesizing Ag NCs, this new approach starts with a colloid that contains nanosized particles as well as smaller species, managing to obtain colloids with few atoms NCs by centrifugation. Those colloids were analyzed by fluorescence spectroscopy observing UV bands corresponding with HOMO-LUMO cluster transitions. Besides, independent HRTEM measurements were made confirming the presence of few atoms Ag NCs, as well as small NPs in different formation stages. Equally important, photocatalytic efficiency of the obtained NCs was studied through degradation of Methylene Blue (MB) when it was mixed with as-prepared or highly centrifuged colloid, showing an enhanced photocatalytic efficiency of 79% as compared to 57% for pure MB after 180 min of illumination. Consequently, this work contributes to establishing a simple approach to synthesize highly fluorescent and photocatalytic NCs. Metal clusters are known as few nanometer sized particles made up of subunits which can be atoms of a single element (mono metal), or of several elements (alloys). Their novel chemical and physical properties are dependent only on the number of atoms they contain. These size-dependent properties, which make them suitable for applications in catalysis 1 , photoluminescence 2 , biomedical 3 and magnetism 4 , among others, show significant deviations from their bulk and large nanoparticles (NPs) counterparts. For this reason metal clusters may be considered as new materials covering the intermediate stage between single atoms/molecules and bulk materials. There are different procedures for clusters synthesis, which rely on the use of microemulsions 5,6 , vesicles 7 and electrochemistry techniques 4,8,9 , thiol cappings 10 and other ligand-protected gold, silver, copper and bimetal/alloy NCs 11,12 synthesized by wet chemistry. Wu et al. 13 presented a review on directed self-assembly (DSA) of ultrasmall (sub-two-nanometer regime) metal NCs through wet chemistry methods. They show that surface ligands are important for self-assembly processes for the different noble metals reviewed. Gold NCs have been studied for their potential use in nanosensors, bioimaging and as biomarkers, the latter based on its well-known biocompatibility characteristics. Copper NCs were studied during the last years for applications in chemical sensors and biolabeling agents based on their catalytic and optical properties. Particularly, DSA allows bright emission in the blue-green for nanoribbons assemble...

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Section: High Resolution and Corrected Electron Microscopy Analysismentioning

confidence: 99%

Section: High Resolution and Corrected Electron Microscopy Analysismentioning

confidence: 99%

Highly fluorescent few atoms silver nanoclusters with strong photocatalytic activity synthesized by ultrashort light pulses

Santillán

Arboleda

Muraca

et al. 2020

Sci Rep

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“…NCs are used in several catalytic reactions including oxidation, 12,13 hydrogenation, 14,15 electrocatalysis 16 and photocatalysis. 17,18 There are several factors affecting the catalytic properties of NCs such as the nature of capping ligands, doping with other metal atoms, and the morphology and nature of the support. 1 Unlike their NP counterparts even a minor change in the atomic composition and core size can alter the catalytic properties dramatically.…”

Section: Tem Images Show a Uniform Distribution Of Monodisperse Ncs Wmentioning

confidence: 99%

Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation

et al. 2020

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“…These uses are feasible because of its exceptional oxygen storage capability; that is, it liberates oxygen in limited conditions and absorbs in rich conditions, with only a minor change in their fluorite structure. As a result, CeO 2 QDs have been considered as a catalyst in sewer water treatment …”

Section: Introductionmentioning

confidence: 99%

La-Doped CeO₂ Quantum Dots: Novel Dye Degrader, Antibacterial Activity, and In Silico Molecular Docking Analysis

et al. 2023

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The current work demonstrates a novel synthesis of different concentrations of La-doped (2, 4, and 6 wt %) CeO 2 quantum dots (QDs) using a hydrothermal approach. This research aimed to examine the dye degradation efficiency, antibacterial activity, and in silico molecular docking analysis of La-doped CeO 2 QDs. The structure, elemental composition, optical properties, d-spacing, and morphological features of QDs were examined using various methods. XRD spectra exhibited the cubic structure of CeO 2 , and the crystallinity was suppressed upon La doping. TEM revealed the formation of cubic-shaped QDs of CeO 2 , and the incorporation of La decreased agglomeration. UV−vis absorption spectra showed a red shift upon La doping, assigned to a decrease in band gap energy. 6% La-doped CeO 2 showed significant antibacterial activity against Escherichia coli at higher concentrations in comparison to ciprofloxacin. La-CeO 2 was proposed as a putative inhibitor of β-lactamase E. coli and DNA gyrase E. coli relying on the outcomes of a molecular docking analysis that was in improved accord with in vitro bactericidal activity. Moreover, the prepared QDs exhibited a remarkable photocatalytic degradation of methylene blue in a basic medium.

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Role of Silver Nanoclusters in the Enhanced Photocatalytic Activity of Cerium Oxide Nanoparticles

Cited by 20 publications

References 50 publications

Highly fluorescent few atoms silver nanoclusters with strong photocatalytic activity synthesized by ultrashort light pulses

Highly fluorescent few atoms silver nanoclusters with strong photocatalytic activity synthesized by ultrashort light pulses

Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation

La-Doped CeO₂ Quantum Dots: Novel Dye Degrader, Antibacterial Activity, and In Silico Molecular Docking Analysis

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Role of Silver Nanoclusters in the Enhanced Photocatalytic Activity of Cerium Oxide Nanoparticles

Cited by 20 publications

References 50 publications

Highly fluorescent few atoms silver nanoclusters with strong photocatalytic activity synthesized by ultrashort light pulses

Highly fluorescent few atoms silver nanoclusters with strong photocatalytic activity synthesized by ultrashort light pulses

Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation

La-Doped CeO2 Quantum Dots: Novel Dye Degrader, Antibacterial Activity, and In Silico Molecular Docking Analysis

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La-Doped CeO₂ Quantum Dots: Novel Dye Degrader, Antibacterial Activity, and In Silico Molecular Docking Analysis