Enhancing Electrochemiluminescence of Chalcogenide Clusters by Means of Mn Replacement

Hesari, Mahdi; Turnbull, Joseph; Khadka, Chhatra B.; Weigend, Florian; Corrigan, John F.; Ding, Zhifeng

doi:10.1016/j.electacta.2016.05.046

Cited by 10 publications

(9 citation statements)

References 43 publications

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“…The nanoclusters exhibiting molecule‐like properties lie in between traditional small molecules and quantum‐confined large nanocrystals such as quantum dots (QDs) ( Figure ). [ 27,38,39 ] Addition or removal of constituents at desired atomic levels can significantly modify the optical, photophysical, and catalytic properties, [ 19,23,40–43 ] making nanoclusters even more fascinating. The precise chemical formula, atomic structure, and high homogeneity of the nanoclusters will enable researchers to systematically study the transition of properties from molecular to bulk phase and vice versa.…”

Section: Introductionmentioning

confidence: 99%

Magic‐Sized Stoichiometric II–VI Nanoclusters

Bootharaju

Baek

Lee

et al. 2020

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Metal chalcogenide nanomaterials have gained widespread interest in the past two decades for their potential optoelectronic, energy, and catalytic applications. The colloidal growth of various forms of these materials, such as nanowires, platelets, and lamellar assemblies, proceeds through certain thermodynamically stable, ultrasmall (<2 nm) intermediates called magic‐sized nanoclusters (MSCs). Due to quantum confinement and its resultant intriguing properties, isolation or direct synthesis of MSCs and their structure characterization, which is very much challenging, are current topics of fundamental and applied scientific research. By comprehensive understanding of the structure–activity relationships in MSCs, the nucleation and growth processes can be manipulated, resulting in the synthesis of novel metal chalcogenide materials for various applications. This review focuses on recent advances in the chemical synthesis, characterization, and theoretical calculations of CdSe and its related II–VI nanoclusters. It highlights the studies of photophysical and magneto‐optical properties as well as heteroatom doping of MSCs followed by their chemical transformation to high‐dimensional nanostructures. At the end of the review, future directions and possible ways to overcome the challenges in the research of semiconductor MSCs are also presented.

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Section: Introductionmentioning

confidence: 99%

Magic‐Sized Stoichiometric II–VI Nanoclusters

Bootharaju

Baek

Lee

et al. 2020

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“…This improvement in the ECL intensity of the standard thereby minimizes the relative quantum efficiency of the thiophene compounds in comparison to the annihilation systems. The mechanisms of some thiophene–triazole–thiophenes, BODIPYs, and Zn clusters in the presence of persulfate have been explored elsewhere. ,, In general, the ECL efficiencies of the persulfate systems were notably enhanced. The ECL efficiency of 3 /persulfate was significantly increased in comparison to its annihilation Φ 3 , reaching 98% relative to Ru(bpy) 3 2+ /persulfate (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…The mechanisms of some thiophene−triazole−thiophenes, BODIPYs, and Zn clusters in the presence of persulfate have been explored elsewhere. 20,43,44 In general, the ECL efficiencies of the persulfate systems were notably enhanced. The ECL efficiency of 3/persulfate was significantly increased in comparison to its annihilation Φ 3 , reaching 98% relative to Ru(bpy) 3 2+ /persulfate (Table 2).…”

Section: +mentioning

confidence: 97%

Structural Insight into Electrogenerated Chemiluminescence of Para-Substituted Aryl–Triazole–Thienyl Compounds

Price

Brazeau

et al. 2016

J. Phys. Chem. C

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There has been a strong push to develop new thiophene-based monomers to tailor the electrical and optical properties of the resulting polymers. However, the synthesis of these elaborated thienyl compounds is difficult to realize. Here, we report the successful click coupling of thienyl azides and para-substituted aryl alkynes to synthesize eight thiophene-based luminophores intended for electrochemical and electrochemiluminescence (ECL) study. These thiophenes could be separated into two series: monothienyl and bithienyl analogues and further categorized based on the nature of the ligand attachment to their phenyl rings (electron-donating or -withdrawing characteristics: NMe 2 , OMe, H, or F) on the other side of the triazole bridge. The electrochemical experiments indicated these compounds lacked stability when they were oxidized or reduced, with the exception of those with a dimethylamine ligand attached (quasireversible oxidations). Cyclic and differential pulse voltammetries revealed the redox potentials of these compounds were affected by the extent of the conjugation and the nature of the ligands, while the electrochemical gaps correlated well with the energy differences between the excited and ground state species. ECL in the annihilation route confirmed the weak light-emitting nature of these thiophenes; however, great improvement was made with the use of a coreactant species (benzoyl peroxide or ammonium persulfate). ECL spectroscopy revealed that the excimer or polymeric excited states were more favorable in formation than their monomeric excited states, which was tunable based on the applied potentials. Structural insight into ECL will guide us to discover optimized thiophene-based luminophores.

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“…Accumulated spectra were collected, for at least 60 seconds, by pulsing the potential between two limits that generated sufficiently intense ECL light. Spooled ECL spectra were collected by gradually scanning the potential from 0.000 V to the first potential limit that resulted in ECL light emission [28,31,32,34,35]. Collection parameters for spooled spectra varied depended on the experimental conditions, where exposure time and kinetic series lengths were optimized to produce the clearest ECL spectra.…”

Section: Ecl Spectroscopymentioning

confidence: 99%

“…All electrochemical analyses were performed in in a cylindrical glass cell with a flat Pyrex window at the bottom to allow for the detection of ECL [15,[30][31][32][33]. Three electrodes were used: the working electrode was a 2 mm platinum disc embedded in a glass tube; the reference and counter electrodes were both coiled platinum wire.…”

Section: Electrochemical Analysismentioning

confidence: 99%