Bibliographies thématiques / Heterogeneous Semiconductor Nanocrystals

Littérature scientifique sur le sujet « Heterogeneous Semiconductor Nanocrystals »

Auteur : Grafiati

Publié le 7 septembre 2023

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Articles de revues sur le sujet "Heterogeneous Semiconductor Nanocrystals"

Taniguchi, Yuki, Takao Takishita, Yusei Kobayashi, Noriyoshi Arai, Tsuyoshi Kawai et Takuya Nakashima. « Amphiphilic self-assembly of semiconductor nanocrystals with heterogeneous compositions ». EPL (Europhysics Letters) 118, n^o 6 (1 juin 2017) : 68001. http://dx.doi.org/10.1209/0295-5075/118/68001.

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Müller, J., J. M. Lupton, P. G. Lagoudakis, F. Schindler, R. Koeppe, A. L. Rogach, J. Feldmann, D. V. Talapin et H. Weller. « Wave Function Engineering in Elongated Semiconductor Nanocrystals with Heterogeneous Carrier Confinement ». Nano Letters 5, n^o 10 (octobre 2005) : 2044–49. http://dx.doi.org/10.1021/nl051596x.

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Beard, Matt C. « (Invited) Ultrafast Spectroscopy Measurements of Lead-Halide Hybrid Semiconductor Nanocrystals for Photocatalysis ». ECS Meeting Abstracts MA2022-02, n^o 48 (9 octobre 2022) : 1831. http://dx.doi.org/10.1149/ma2022-02481831mtgabs.

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We are exploring the use of metal-halide perovskite semiconductor nanocrystals (PNCs) as efficient photocatalysis. Heterogeneous photocatalysis are less common than homogeneous but can provide unique avenues for inducing novel chemical transformations and can also be utilized for energy transductions, i.e., the energy in the photons can be captured in chemical bonds. Additional, earth abundant nanocrystal based photocatalyst are highly sought after as they can potentially eliminate expensive noble metal catalyst. A detailed understand of the underlying reaction mechanism could provide guidance in designing new systems that can activate a larger class of small molecules. Here, we discuss transient absorption spectroscopy to study a model C-C bond formation reaction, i.e., alkylation of aldehydes catalyzed by colloidal CsPbBr3 NCs. We find that both electrons and holes undergo ultrafast charge transfer from photoexcited PNCs. After charge transfer the charge separated state lives ~ 1 ns enabling radical mechanism to form C-C bonds. I will also discuss the use of PNCs to host a transition metal Cu-site incorporated at the surface of the PNCs to induce a to induce a N-N heterocyclization reaction. The reaction starts from surface coordinated diamine substrates and requires to subsequent photo-oxidation events. We established a photocatalytic cycle where photo-excited holes are funneled to the coordinated substrates.

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Rashad, Shimaa, A. H. Zaki et A. A. Farghali. « Morphological effect of titanate nanostructures on the photocatalytic degradation of crystal violet ». Nanomaterials and Nanotechnology 9 (1 janvier 2019) : 184798041882177. http://dx.doi.org/10.1177/1847980418821778.

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The heterogeneous photocatalysis using semiconductor nanocrystals is an important process in the field of water treatment since it is a low cost, environmentally friendly, and zero waste technique. In this work, titanate nanostructures (sheets, tubes, and wires) were prepared by simple hydrothermal method. All samples were characterized by X-ray diffraction, transmission electron microscopy, Brunauer–Emmett–Teller surface area analysis, and Zetasizer. The results revealed that tuning the morphology of TiO2 changed the activity of the prepared nanostructures, where titanate nanowires exhibited the highest photocatalytic activity toward crystal violet dye, reaching 100% at pH 3 under ultraviolet illumination for 35 min.

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Henan, Ni, Wu Liangcai, Song Zhitang et Hui Chun. « Memory characteristics of an MOS capacitor structure with double-layer semiconductor and metal heterogeneous nanocrystals ». Journal of Semiconductors 30, n^o 11 (novembre 2009) : 114003. http://dx.doi.org/10.1088/1674-4926/30/11/114003.

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Fan, Feng-Ru, Yong Ding, De-Yu Liu, Zhong-Qun Tian et Zhong Lin Wang. « Facet-Selective Epitaxial Growth of Heterogeneous Nanostructures of Semiconductor and Metal : ZnO Nanorods on Ag Nanocrystals ». Journal of the American Chemical Society 131, n^o 34 (2 septembre 2009) : 12036–37. http://dx.doi.org/10.1021/ja9036324.

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Kublik, Natalya, Luiz E. Gomes, Luiz F. Plaça, Thalita H. N. Lima, Thais F. Abelha, Julio A. P. Ferencz, Anderson R. L. Caires et Heberton Wender. « Metal-Free g-C3N4/Nanodiamond Heterostructures for Enhanced Photocatalytic Pollutant Removal and Bacteria Photoinactivation ». Photochem 1, n^o 2 (14 septembre 2021) : 302–18. http://dx.doi.org/10.3390/photochem1020019.

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Heterogeneous photocatalysis has emerged as a promising alternative for both micropollutant removal and bacterial inactivation under solar irradiation. Among a variety of photocatalysts explored in the literature, graphite carbon nitride (g-C3N4) is a metal-free semiconductor with acceptable chemical stability, low toxicity, and excellent cost-effectiveness. To minimize its high charge recombination rate and increase the photocatalyst adsorption capacity whilst keeping the metal-free photocatalyst system idea, we proposed the heterojunction formation of g-C3N4 with diamond nanocrystals (DNCs), also known as nanodiamonds. Samples containing different amounts of DNCs were assessed as photocatalysts for pollutant removal from water and as light-activated antibacterial agents against Staphylococcus sureus. The sample containing 28.3 wt.% of DNCs presented the best photocatalytic efficiency against methylene blue, removing 71% of the initial dye concentration after 120 min, with a pseudo-first-order kinetic and a constant rate of 0.0104 min−1, which is nearly twice the value of pure g-C3N4 (0.0059 min−1). The best metal-free photocatalyst was able to promote an enhanced reduction in bacterial growth under illumination, demonstrating its capability of photocatalytic inactivation of Staphylococcus aureus. The enhanced photocatalytic activity was discussed and attributed to (i) the increased adsorption capacity promoted by the presence of DNCs; (ii) the reduced charge recombination rate due to a type-II heterojunction formation; (iii) the enhanced light absorption effectiveness; and (iv) the better charge transfer resistance. These results show that g-C3N4/DNC are low-cost and metal-free photoactive catalysts for wastewater treatment and inactivation of bacteria.

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Smith, Andrew M. « (Keynote) Quantum Dot Coatings for Aqueous Stabilization and Applications in Biomolecular Analysis ». ECS Meeting Abstracts MA2022-02, n^o 20 (9 octobre 2022) : 909. http://dx.doi.org/10.1149/ma2022-0220909mtgabs.

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Semiconductor quantum dots have been commercially available as molecular probes for applications in the life sciences and clinical diagnostics for two decades, however they have only been adopted in niche applications. Part of the reason for limited adoption is attributable to challenges in colloidal stabilization, as these solid nanocrystals tend to aggregate and nonspecifically adsorb to surfaces and cellular structures. This can largely be alleviated by use of nanocrystal coatings that resist nonspecific binding and promote aqueous dispersion, however the vast majority of such coatings are based on neutral and zwitterionic polymers that add considerable hydrodynamic size to the product. This size increase is due to the bulk of the coating itself as well as adsorption of water molecules and ions in solution. The size increase causes steric hindrance and inaccurate molecular labeling when these probes are used to analyze targets that have considerable size or ones that are located in crowded regions of cells or tissues. Furthermore, the bioaffinity label that attaches the quantum dot to its intended molecular target often contributes substantially to the final size and stability of the probe. This is especially challenging for protein labeling using antibodies, which themselves are fairly large proteins that attach heterogeneously to quantum dots, typically yielding large, polydisperse products. This talk will focus on developments in quantum dot engineering, monolayer polymeric coatings, and bioconjugation strategies to optimize offsetting characteristics of size, homogeneity, bioaffinity, and specificity. In particular, multidentate polymer coatings in recent years have enabled the production of quantum dots with long-term shelf life, small hydrodynamic diameters, and efficient click chemistry conjugations. By tuning the conjugation methods to antibody fragments and single-stranded DNA, we can now prepare bioaffinity labels for proteins and nucleic acids in the ~10 nm range, with further size reductions possible through nanocrystal heterostructure engineering. This talk will also cover how in situ protein and nucleic acid labeling applications can benefit from these advances in addition to current challenges in processing, scale-up, and user adoption.

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Jiang, Bo, Yifei Yuan, Wei Wang, Kun He, Chao Zou, Wei Chen, Yun Yang, Shun Wang, Vitaliy Yurkiv et Jun Lu. « Surface lattice engineering for fine-tuned spatial configuration of nanocrystals ». Nature Communications 12, n^o 1 (27 septembre 2021). http://dx.doi.org/10.1038/s41467-021-25969-7.

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AbstractHybrid nanocrystals combining different properties together are important multifunctional materials that underpin further development in catalysis, energy storage, et al., and they are often constructed using heterogeneous seeded growth. Their spatial configuration (shape, composition, and dimension) is primarily determined by the heterogeneous deposition process which depends on the lattice mismatch between deposited material and seed. Precise control of nanocrystals spatial configuration is crucial to applications, but suffers from the limited tunability of lattice mismatch. Here, we demonstrate that surface lattice engineering can be used to break this bottleneck. Surface lattices of various Au nanocrystal seeds are fine-tuned using this strategy regardless of their shape, size, and crystalline structure, creating adjustable lattice mismatch for subsequent growth of other metals; hence, diverse hybrid nanocrystals with fine-tuned spatial configuration can be synthesized. This study may pave a general approach for rationally designing and constructing target nanocrystals including metal, semiconductor, and oxide.

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Kadavanich, A. V., A. Mews, S. H. Tolbert, X. Peng, M. C. Schlamp, J. C. Lee et A. P. Alivisatos. « Structural Investigations of Colloidal Semiconductor Nanocrystal Heterostructures : Faceting and Epitaxy ». MRS Proceedings 452 (1996). http://dx.doi.org/10.1557/proc-452-353.

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AbstractWe use High Resolution Transmission Microscopy (HRTEM) to study CdSe, CdS/HgS/CdS quantum-dot quantum well (QDQW), and CdSe/CdS core-shell nanocrystals, grown by wet-chemical techniques. The nanocrystals have faceted Wulff polyhedron shapes.In addition to HRTEM, we employ multi-wavelength anomalous dispersion (MAD) x-ray diffraction. We use computer modeling to help interpret the experimental data.Growth of a heterogeneous phase proceeds epitaxially preserving the overall shape and point-group symmetry of the original seed nanocrystals, both for wurtzite (CdSe/CdS) and zincblende (CdS/HgS/CdS) type structures.Recently prepared InAs nanocrystals also show evidence of faceting as observed by HRTEM and may lend themselves equally well to epitaxy.

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Actes de conférences sur le sujet "Heterogeneous Semiconductor Nanocrystals"

Henan Ni, Liangcai Wu, Zhitang Song et Chun Hui. « Memory characteristics of double-layer metal and semiconductor heterogeneous nanocrystals embedded in SiO2 ». Dans 2009 4th IEEE International Conference on Nano/Micro Engineered and Molecular Systems. IEEE, 2009. http://dx.doi.org/10.1109/nems.2009.5068669.

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