Assemble–Disassemble–Reassemble Dynamics in Copper Nanocluster-Based Superstructures

Agrawal, Sameeksha; Rai, Saurabh; Mahato, Paritosh; Ali, Asif; Mukherjee, Saptarshi

doi:10.1021/acs.jpclett.4c00755

J. Phys. Chem. Lett.

2024

DOI: 10.1021/acs.jpclett.4c00755

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Assemble–Disassemble–Reassemble Dynamics in Copper Nanocluster-Based Superstructures

Sameeksha Agrawal,

Saurabh Rai,

Paritosh Mahato

et al.

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2024

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Cited by 3 publications

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Single Source Polychromatic Luminescent and White Emitting Copper Nanoclusters

Sarkar,

Radhakrishnan

2024

Advanced Optical Materials

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The low cost and fine‐tunability of the luminescence of copper nanoclusters make them attractive candidates for opto‐electronic, imaging, and sensing applications; their stability, and a precise understanding of the structure–function correlations however, continue to be challenging. A comprehensive chemical etching strategy is developed to synthesize orange, blue, and cyan emitting nanoclusters from a single source of ultrasmall copper nanoparticles; high quantum yields up to ≈34% are realized. Steady state and time‐resolved spectroscopy, electron microscopy, high resolution mass spectrometry, and computational modeling provide critical mechanistic insight into the polychromatic luminescence. A facile method for the fabrication of polymer nanocomposite thin films that sustain and stabilize the luminescent nanoclusters is presented. A subtle variation of the etching strategy without the need to admix multiple components, provides white luminescent thin films with Commission Internationale de l'éclairage (CIE) coordinates, x = 0.35, y = 0.33. The highlights of this work are i) the simple solution synthesis of stable, uniform, and pure ultrasmall Cu nanoparticles, ii) their chemical etching by subtle variations in an optimized protocol to produce highly luminescent, polychromatic nanoclusters, including white‐emitting ones, iii) stabilization of the bright luminescent systems in nanocomposite thin films, and iv) a detailed analysis of the luminescence tuning.

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Single Source Polychromatic Luminescent and White Emitting Copper Nanoclusters

Sarkar,

Radhakrishnan

2024

Advanced Optical Materials

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Photoinduced Formation and Intercluster Conversion of a Thiol-Templated Copper Nanocluster

Gupta,

Agrawal,

Rai

et al. 2024

ACS Appl. Opt. Mater.

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The preparation of metal nanoclusters through light− matter interaction is an unexplored realm of nanomaterials research. A comprehensive understanding of the stages involved in the growth process of nanoclusters is scant in the literature. Herein, we report the photoinduced formation of yellow-emissive copper nanoclusters (Y-CuNCs) from a binuclear copper complex [Cu 2 (SPhCl) 2 (PPh 3 ) 4 ], which was subsequently observed to undergo photoinduced conversion to green-emissive copper nanoclusters (G-CuNCs). We were able to characterize the intermediate complexes, fragments, and nanoclusters formed in the process, which were attributed to the precursors for the formation of CuNCs. To the initially formed binuclear copper complex Cu 2 (SPhCl) 2 (PPh 3 ) 4 , irradiation with ultraviolet (UV) light (λ ∼ 365 nm) resulted in the Y-CuNCs. Further, upon irradiation of the solution of Y-CuNCs with UV light, the Y-CuNCs convert to G-CuNCs via photoinduced intercluster conversion. The formation of both CuNCs has been extensively studied through UV−vis absorption features, photoluminescence studies, and lifetime measurements. The formation of CuNCs and photoinduced intercluster conversion has been confirmed with the help of transmission electron microscopy images, electrospray ionization mass spectroscopy (ESI-MS) analysis, and 31 P NMR data analysis. Moreover, a plausible mechanism of intercluster conversion has also been substantiated with the help of ESI-MS data analysis.

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Superstructures of copper nanoclusters as NIR TADF emitters: solvent-dependent optical and morphological modulation

Agrawal,

Shil,

Gupta

et al. 2024

Nanoscale

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Assemble–Disassemble–Reassemble Dynamics in Copper Nanocluster-Based Superstructures

Cited by 3 publications

References 57 publications

Single Source Polychromatic Luminescent and White Emitting Copper Nanoclusters

Single Source Polychromatic Luminescent and White Emitting Copper Nanoclusters

Photoinduced Formation and Intercluster Conversion of a Thiol-Templated Copper Nanocluster

Superstructures of copper nanoclusters as NIR TADF emitters: solvent-dependent optical and morphological modulation

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