Cadmium selenide by XPS

Ospina, Rogelio; Rincón‐Ortiz, Sergio A.; Rodríguez‐Pereira, Jhonatan

doi:10.1116/6.0000162

Cited by 13 publications

(18 citation statements)

References 4 publications

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“…9 eV, which is attributed to S 2− species, related to the Zn-S bond from the shell [42,43]. The less intense doublet Se 3p 3/2 /Se 3p 1/2 located at ~160.2 eV/166.0 eV confirms the presence of Se 2found in Se 3d signal [39].…”

Section: Morphology and Analyticalmentioning

confidence: 75%

“…These results are good confirmation of the gradual growth of ZnS layers around the Cd0.25Zn0.75Se core. [39,40]. The Zn 2p HR spectrum is illustrated in Figure 6d, and its doublet, Zn 2p 3/2 /Zn 2p 1/2 , appears at ~1021.8 eV/ 1044.8 eV and suggests the presence of Zn 2+ [41,42].…”

Section: Morphology and Analyticalmentioning

confidence: 97%

“…Additionally, Table 1 displays the results of the elemental composition of the samples and it demonstrates the aforementioned trend. [39,40]. The Zn 2p HR spectrum is illustrated in Figure 6d, and its doublet, Zn 2p3/2/Zn 2p1/2, appears at ~1021.8 eV/ 1044.8 eV and suggests the presence of Zn 2+ [41,42].…”

Section: Morphology and Analyticalmentioning

confidence: 97%

“…The Zn 2p HR spectrum is illustrated in Figure6d, and its doublet, Zn 2p3/2/Zn 2p1/2, appears at ~1021.8 eV/ 1044.8 eV and suggests the presence of Zn 2+[41,42]. In the Se 3d HR spectrum displayed in Figure6e, the presence of Se 2-species was found, as the spin-orbit signal Se 3d5/2/Se 3d3/2 is located at ~53.8 eV/54.7 eV[39,40]. In Figure6f, a strong overlap between the S 2p and Se 3p signals is evidenced.…”

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confidence: 92%

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Highly Efficient and Controllable Methodology of the Cd0.25Zn0.75Se/ZnS Core/Shell Quantum Dots Synthesis

et al. 2021

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The surface of any binary or multi-component nanocrystal has imperfections and defects. The number of surface defects depends both on the nature of the nanomaterial and on the method of its preparation. One of the possibilities to confine the number of surface defects is the epitaxial growth of the shell, which leads to a change in the physical properties while maintaining the morphology of the core. To form a shell of the desired thickness, an accurate calculation of the amount of its precursors is substantial to avoid the appearance of individual crystals consisting of the shell material. This study aimed to develop an effective calculation method for the theoretical amount of precursors required for the formation of a ZnS shell on the surface of a Cd0.25Zn0.75Se core, followed by the practical implementation of theoretical calculations and characterization of the prepared nanomaterials. This method allows the complete control of the masses and volumes of the initial reagents, which will in turn prevent undesirable nucleation of nuclei consisting of the shell material. In the synthesis of Cd0.25Zn0.75Se/ZnS core/shell quantum dots (QDs), the sources of chalcogens were substituted seleno- and thioureas, which are capable of not only supplanting modern toxic sources of sulfur and selenium but also allowing one to perform the controlled synthesis of highly photoluminescent QDs with a low number of surface defects. The result of this shell overcoating method was an impetuous augmentation in the photoluminescence quantum yield (PL QY up to 83%), uniformity in size and shape, and a high yield of nanomaterials. The developed synthetic technique of core/shell QDs provides a controlled growth of the shell on the core surface, which makes it possible to transfer this method to an industrial scale.

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Section: Morphology and Analyticalmentioning

confidence: 75%

Section: Morphology and Analyticalmentioning

confidence: 97%

Section: Morphology and Analyticalmentioning

confidence: 97%

mentioning

confidence: 92%

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Highly Efficient and Controllable Methodology of the Cd0.25Zn0.75Se/ZnS Core/Shell Quantum Dots Synthesis

et al. 2021

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“…[ 55 ] In contrast, XPS spectra of CdSe/Ag hybrids show Cd peaks at 405.06 eV (Cd 3d 5/2 ) and 411.77 eV (Cd 3d 3/2 ) corresponding to Cd 2+ , [ 56,57 ] and Se peaks at 53.90 eV (3d 5/2 ) and 54.60 eV (3d 3/2 ) corresponding to both Se 2− and Se n n − species (Figure 7). [ 54,58,59 ] The binding energies of Ag in the hybrids were observed at 368.09 eV (Ag 3d 5/2 ) and 373.98 eV (Ag 3d 3/2 ) that can be assigned to metallic Ag (0) species. [ 60,61 ] It is important to note that CdSe NPs and aerogels are reported to undergo cation exchange with Ag + to produce α‐Ag 2 Se.…”

Section: Resultsmentioning

confidence: 99%

CdSe/Ag Hybrid Aerogels: Integration of Plasmonic and Excitonic Properties of Metal–Semiconductor Nanostructures via Sol–Gel Assembly

Liyanage

Spera

Sarkar

et al. 2021

Advanced Photonics Research

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Metal–semiconductor hybrid nanomaterials (HNMs) exhibit unique properties that are distinct from individual nanostructures, leading to promising applications in optical technologies. The interfacial linkage of semiconductor and metal nanoparticles (NPs) via cogelation is an effective strategy to produce HNMs that show strong plasmon‐exciton coupling and improved physical properties. However, optical properties of these hybrids show little to no tunability. Herein, CdSe/Ag hybrid aerogels that show tunable absorption and photoluminescence (PL) are produced by cogelation of CdSe nanorods (NRs) or NPs with Ag hollow NPs. Hybrid electronic states are created by overlapping the excitonic absorption of CdSe NRs or NPs with the plasmonic absorption of Ag NPs. Physical characterization of the hybrids reveals an interconnected network of hexagonal CdSe and cubic Ag NPs, linked by Ag+ and Se2− surface species, without intervening ligands. PL spectra exhibit maxima at 640 and 720 nm for the CdSe NPs/Ag and CdSe NRs/Ag hybrids, respectively, corresponding to new radiative decay mechanisms. Time‐resolved PL data support the emergence of new radiative pathways, kinetically and energetically distinct from the excitonic and plasmonic properties of primary NPs. This new approach of metal–semiconductor hybrid formation through cogelation is intriguing for the design of high‐efficiency HNMs without detrimental PL quenching.

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Hierarchical growth of CdSe dendritic nanostructures for enhanced field emission application

Chopade,

Bhopale,

Jagtap

et al. 2024

J Mater Sci: Mater Electron

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Cadmium selenide by XPS

Cited by 13 publications

References 4 publications

Highly Efficient and Controllable Methodology of the Cd0.25Zn0.75Se/ZnS Core/Shell Quantum Dots Synthesis

Highly Efficient and Controllable Methodology of the Cd0.25Zn0.75Se/ZnS Core/Shell Quantum Dots Synthesis

CdSe/Ag Hybrid Aerogels: Integration of Plasmonic and Excitonic Properties of Metal–Semiconductor Nanostructures via Sol–Gel Assembly

Hierarchical growth of CdSe dendritic nanostructures for enhanced field emission application

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