Application of nanocrystalline CdTe quantum dots in chemical analysis: Implementation of chemo-sensing schemes based on analyte-triggered photoluminescence modulation

Rodrigues, S. Sofia M.; Ribeiro, David S.M.; Soares, José X.; Passos, Marieta L.C.; Saraiva, M. Lúcia M.F.S.; Santos, João L.M.

doi:10.1016/j.ccr.2016.10.001

Cited by 68 publications

(14 citation statements)

References 120 publications

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“…30,31 Moreover, complexes containing 4,4'-bipy or 2,2'-biim ligands can generally also show good photoluminescence due to the existence of their delocalized π electrons. As a result, the title complex is expected to possess photoluminescent behavior.…”

Section: Resultsmentioning

confidence: 99%

Preparation, Structure, Photoluminescent and Semiconductive Properties, and Theoretical Calculation of a Novel Cadmium Complex with Mixed Ligands

Chen

Huang

et al. 2017

ACSi

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A novel cadmium complex with mixed ligands {[Cd(2,2'-biim)(4,4'-bipy)(H 2 O)(ClO 4 )] (ClO 4 )} n (1) (2,2'-biim = 2,2'-biimidazole; 4,4'-bipy = 4,4'-bipyridine) has been synthesized through hydrothermal reaction and its crystal structure was determined by single-crystal X-ray diffraction technique. Single-crystal X-ray diffraction analyses revealed that complex 1 crystallizes in the space group Pna2 1 of the orthorhombic system and exhibits a one-dimensional zigzag chain structure consisting of [Cd(2,2'-biim)(4,4'-bipy)(H 2 O)(ClO 4 )] n n+ cationic chains and isolated ClO 4 -anions. Powder photoluminescent characterization reveals that complex 1 has an emission in the green region of the spectrum. Time-dependent density functional theory (TDDFT) calculation showed that the nature of the photoluminescence of complex 1 is originated from the ligand-to-ligand charge transfer (LLCT; from the HOMO of the perchlorate anions to the LUMO of the 4,4'-bipy ligand). A wide optical band gap of 3.25 eV was found by the solid-state UV/vis diffuse reflectance spectrum.

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Section: Resultsmentioning

confidence: 99%

Preparation, Structure, Photoluminescent and Semiconductive Properties, and Theoretical Calculation of a Novel Cadmium Complex with Mixed Ligands

Chen

Huang

et al. 2017

ACSi

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“…In the PET process, the excited electron is transferred from the conduction band to an electron acceptor (A) as a reductant or accepts an electron in the hole from a donor (D) as an oxidant (Figure 5). In order to promote a PET process, it is necessary to have a difference in the redox potential in the donor and the acceptor energy levels [10]. The band gap in QDs is particle size-dependent; therefore, the electron transfer can be controlled by adjusting this parameter.…”

Section: Photoinduced Electron Transfermentioning

confidence: 99%

“…There are different interactions between the QDs and analytes; therefore, the synthetic protocol to be employed would depend on the analytical method design, and then it is necessary to evaluate the possible interactions and the changes produced on the spectroscopic signal [ 10 ].…”

Section: Synthesis Of Ternary Quantum Dotsmentioning

confidence: 99%

“…The use of ternary QDs in analytical applications has increased in the last decade. When a methodology is designed, different variables need to be considered as the spectroscopical properties’ characteristics and the interactions with the analyte [ 10 ]. Different protocols have been proposed for the synthesis of aqueous ternary quantum dots, in which the precursors or components react to form the nanoparticle with the desired size (therefore, the spectroscopic properties) and surface ligand.…”

Section: Introductionmentioning

confidence: 99%

“…Commonly, the analytical methodologies are based in spectroscopic changes of QDs due their interaction with an analyte; therefore, it is important to consider the analyte chemistry and the mechanisms of reaction with QDs. Some common changes are: quenching of the emission signal due to QDs’ changes on the surface, quenching due to an energy transfer from QDs to an acceptor referred to as Foster resonance energy transfer (FRET), and enhancing of the emission signal due to a passivation of surface traps, among others [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Ternary Quantum Dots in Chemical Analysis. Synthesis and Detection Mechanisms

et al. 2021

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Ternary quantum dots (QDs) are novel nanomaterials that can be used in chemical analysis due their unique physicochemical and spectroscopic properties. These properties are size-dependent and can be adjusted in the synthetic protocol modifying the reaction medium, time, source of heat, and the ligand used for stabilization. In the last decade, several spectroscopic methods have been developed for the analysis of organic and inorganic analytes in biological, drug, environmental, and food samples, in which different sensing schemes have been applied using ternary quantum dots. This review addresses the different synthetic approaches of ternary quantum dots, the sensing mechanisms involved in the analyte detection, and the predominant areas in which these nanomaterials are used.

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