Efficient electrogenerated chemiluminescence from CdTe quantum dots with coreactants

Shin, Ik‐Soo; Kim, Hasuck; Bang, Jin Ho

doi:10.1016/j.jelechem.2011.09.023

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…It has been proposed that ECL generation via the annihilation of cationic and anionic CdTe nanocrystals is not efficient because positively charged CdTe QDs are unstable and short lived. 67 When an iridium complex, also known to be a poor ECL generator, was used as a coreactant, the ECL signal increased dramatically, most likely because of cooperative effects of the two species towards ECL generation. 67 ECL from CdTe nanocrystals was observed in CH 2 Cl 2 solution upon scanning the potential in the negative direction (from 0 to À2.46 V versus the SCE).…”

Section: Electrochemiluminescencementioning

confidence: 99%

“…67 When an iridium complex, also known to be a poor ECL generator, was used as a coreactant, the ECL signal increased dramatically, most likely because of cooperative effects of the two species towards ECL generation. 67 ECL from CdTe nanocrystals was observed in CH 2 Cl 2 solution upon scanning the potential in the negative direction (from 0 to À2.46 V versus the SCE). 59 This signal cannot be accounted for by the annihilation of charged nanoparticles; its origin was interpreted in terms of a mechanism in which the solvent acts as coreactant through its reduced form:…”

Section: Electrochemiluminescencementioning

confidence: 99%

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Electrochemical properties of CdSe and CdTe quantum dots

et al. 2012

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Semiconductor nanocrystal quantum dots (QDs), owing to their unique opto-electronic properties determined by quantum confinement effects, have been the subject of extensive investigations in different areas of science and technology in the past two decades. The electrochemical behaviour of QDs, particularly for CdSe and CdTe nanocrystals, has also been explored, although to a lesser extent compared to the optical properties. Voltammetric measurements can be used to probe the redox levels available for the nanocrystals, which is an invaluable piece of information if these systems are involved in electron transfer processes. Electrochemical data can also foster the interpretation of the spectroscopic properties of QDs, and give insightful information on their chemical composition, dimension, and surface properties. Hence, electrochemical methods constitute in principle an effective tool to probe the quality of QD samples in terms of purity, size dispersion, and surface defects. The scope of this critical review is to discuss the results of electrochemical studies carried out on CdSe and CdTe core and core-shell semiconductor nanocrystals of spherical shape. Examples of emerging or potential applications that exploit electroactive quantum dot-based systems will also be illustrated.

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Section: Electrochemiluminescencementioning

confidence: 99%

Section: Electrochemiluminescencementioning

confidence: 99%

Electrochemical properties of CdSe and CdTe quantum dots

et al. 2012

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“…A carbon screen-printed electrode (SPE) coupled with a tris(2,2′-bipyridyl) ruthenium (II) complex was used to create oxidative-reduction ECL. Adding cadmium telluride quantum dots (CdTeQDs)(Han et al 2007;Kang et al 2012;Shin et al 2011;Yin et al 2013) creates unstable products from intermediate radicals in the Ru(bpy) 3 2+ CL reaction process, where nitrofurans cause an indirect inhibitory effect on Ru(bpy) 3 2+ compounds). The ECL CdTe-QD system shows high sensitivity, good stability, and reproducibility, indicating CdTeQDs could be a new and promising material, opening new avenues in ECL application.…”

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confidence: 99%