A facile UV-light mediated synthesis of l-histidine stabilized silver nanocluster for efficient photodegradation of methylene blue

Pal, Nabin Kumar; Kryschi, Carola

doi:10.1016/j.molcata.2015.04.004

Cited by 15 publications

(10 citation statements)

References 44 publications

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“…The UV-Vis absorption spectrum ( Figure 1 A) presents two peaks at 256 and 324 nm which are typical for AuNCs stabilized by His according to the literature [ 36 ]. Moreover, the absence of the localized surface plasmon resonance band, typical for larger-sized Au nanoparticles, suggests that the as-prepared His-AuNCs are very small in size.…”

Section: Resultsmentioning

confidence: 59%

Photoluminescent Histidine-Stabilized Gold Nanoclusters as Efficient Sensors for Fast and Easy Visual Detection of Fe Ions in Water Using Paper-Based Portable Platform

Hada

Zetes

Focșan

et al. 2022

IJMS

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Herein is presented a novel and efficient portable paper-based sensing platform using paper-incorporated histidine stabilized gold nanoclusters (His-AuNCs), for the sensitive and selective detection of Fe ions from low-volume real water samples based on photoluminescence (PL) quenching. Highly photoluminescent colloidal His-AuNCs are obtained via a novel microwave-assisted method. The His-AuNCs-based sensor reveals a limit of detection (LOD) as low as 0.2 μM and a good selectivity towards Fe ions, in solution. Further, the fabricated portable sensing device based on paper impregnated with His-AuNCs proves to be suitable for the easy detection of hazardous Fe levels from real water samples, under UV light exposure, through evaluating the level of PL quenching on paper. Photographic images are thereafter captured with a smartphone camera and the average blue intensity ratio (I/I0) of the His-AuNCs-paper spots is plotted against [Fe2+] revealing a LOD of 3.2 μM. Moreover, selectivity and competitivity assays performed on paper-based sensor prove that the proposed platform presents high selectivity and accuracy for the detection of Fe ions from water samples. To validate the platform, sensing assays are performed on real water samples from local sources, spiked with 35 μM Fe ions (i.e., Fe2+). The obtained recoveries prove the high sensitivity and accuracy of the proposed His-AuNCs-paper-based sensor pointing towards its applicability as an easy-to-use, fast, quantitative and qualitative sensor suitable for on-site detection of toxic levels of Fe ions in low-volume real water samples.

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Section: Resultsmentioning

confidence: 59%

Photoluminescent Histidine-Stabilized Gold Nanoclusters as Efficient Sensors for Fast and Easy Visual Detection of Fe Ions in Water Using Paper-Based Portable Platform

Hada

Zetes

Focșan

et al. 2022

IJMS

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“…Compared with the CdS NW substrate, Cd 3d and S 2p peaks in the Cd 3d (Figure gII) and S 2p (Figure hII) spectra of the Ag x @GSH/CdS NW heterostructure exhibit obvious red shifts in the binding energy (B.E. ), indicative of the substantial interfacial and electronic interaction between Ag x @GSH NCs and CdS NW substrates. − The Ag 3d spectrum of Ag x @GSH/CdS NWs (Figure i) shows two doublet bands at 373.16 (Ag 3d 3/2 ) and 367.84 eV (Ag 3d 5/2 ), , which correspond to the Ag 0 and Ag + species from the characteristic Ag(0)/Ag(I) structure of Ag x @GSH NCs, respectively, and confirm the Ag x @GSH NC deposition on the CdS NW surface . Specific surface areas of CdS NWs, CdS@MEA NWs, and Ag x @GSH/CdS NWs are measured as ca.…”

Section: Resultsmentioning

confidence: 99%

Atomically Precise Metal Nanocluster-Mediated Photocatalysis

et al. 2022

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Atomically precise thiolate-capped metal nanoclusters (NCs), as a recently developed category of metal nanomaterials, show emerging potential in solar energy harvesting and conversion owing to the peculiar atom-stacking mode, quantum confinement effect, and discrete energy band structure. However, the super-short photoexcited charge carrier life span and barren active sites of metal NCs as well as instability retard the photosensitization efficiency in photoredox catalysis. Herein, we conceptually demonstrate the general design of glutathione (GSH)-capped metal NCs/transition metal chalcogenides (TMCs), that is, metal NCs [Ag x , Ag31(GSH)19, Ag16(GSH)9, Ag9(GSH)6]/TMC (CdS, Zn0.5Cd0.5S) heterostructures by a ligand-initiated self-assembly route, based on which atomically precise metal NCs are accurately anchored on the TMC substrates under substantial electrostatic interaction. It was unveiled that photoinduced electrons from metal NCs can flow to the TMC substrates and holes migrate in an opposite direction, featuring the quintessential type II charge transport pathway because of the suitable energy level alignment, intimate interfacial integration mode, and boosted charge separation. Given the efficacious interfacial charge migration/separation, metal NCs/TMC heterostructures exhibit significantly boosted photoactivities toward selective organic transformation and solar-to-hydrogen conversion under visible light irradiation. Our work would provide new insights into rationally crafting metal NC-based photosystems and open a promising vista for modulating vectorial charge transfer over metal NCs toward substantial solar-to-chemical energy conversion.

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“…biological imaging, labelling and therapeutics). Several reports are available where gold nanoclusters were prepared using proteins, 19 dendrimers, 20 amino acids, 21 DNA 22 and polyelectrolytes 23 as scaffolds. However, most of the methods mentioned above need an expensive starting material, photoirradiation, electric field application or an external toxic reducing agent such as sodium borohydride.…”

Section: Introductionmentioning

confidence: 99%

A facile one-pot synthesis of blue and red luminescent thiol stabilized gold nanoclusters: a thorough optical and microscopy study

Pal

Kryschi

2015

Phys. Chem. Chem. Phys.

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Here in this contribution, blue and red luminescent 1-dodecanethiol (DT) terminated gold nanoclusters (AuNC) were prepared by a simple two-step synthesis route where the first step involved the surfactantfree synthesis of bare AuNC in N,N 0 -dimethylformamide (DMF) and the second step is the termination of the as-prepared bare AuNC by 1-dodecanethiol. The blue and red luminescent DT-terminated AuNC were isolated by a solvent-induced precipitation followed by an ultra-centrifugation technique. Both the bare AuNC and the blue and red luminescent DT-terminated AuNC exhibit stable photoluminescence and good solubility in various solvents. The photo-physical, electronic, structural, and morphological properties of the bare AuNC and the blue and red luminescent DT-terminated AuNC were examined by performing UV-Vis absorption spectroscopy, stationary and time-resolved PL spectroscopy, X-ray photoelectron spectroscopy (XPS), femtosecond transient absorption spectroscopy, Fourier-transform infrared spectroscopy (FTIR-ATR), and high-resolution transmission electron microscopy (HRTEM) experiments.

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A facile UV-light mediated synthesis of l-histidine stabilized silver nanocluster for efficient photodegradation of methylene blue

Cited by 15 publications

References 44 publications

Photoluminescent Histidine-Stabilized Gold Nanoclusters as Efficient Sensors for Fast and Easy Visual Detection of Fe Ions in Water Using Paper-Based Portable Platform

Photoluminescent Histidine-Stabilized Gold Nanoclusters as Efficient Sensors for Fast and Easy Visual Detection of Fe Ions in Water Using Paper-Based Portable Platform

Atomically Precise Metal Nanocluster-Mediated Photocatalysis

A facile one-pot synthesis of blue and red luminescent thiol stabilized gold nanoclusters: a thorough optical and microscopy study

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