Semiconductor Quantum Dots as Components of Photoactive Supramolecular Architectures

Rosa, Marcello La; Payne, Emily H.

doi:10.1002/open.201900336

Cited by 9 publications

(7 citation statements)

References 145 publications

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“…[34] The nanocrystal sizes have been suitable designed so that the QDs have their excitonic transitions in mutual resonance; in particular, the first excitonic transition (1Se -1S3/2, 1) of the smaller QD1 energetically matches the second excitonic transition (1Se -2S3/2, 2) of the larger QD2, both centred at 590 nm. Considering the possible energy or charge transfer processes that can occur between the two nano-objects when they are in close proximity, [23,24,41,42] we can attribute at the QD1 the role of donor and at the QD2 the role of acceptor, even when they are dispersed in solution.…”

Section: Resultsmentioning

confidence: 99%

Coupling in quantum dot molecular hetero-assemblies

Dibenedetto

Fanizza

et al. 2022

Materials Research Bulletin

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The design of large-scale colloidal quantum dots (QDs) assemblies and the investigation of their interaction with their close environment are of great interest for improving QD-based optoelectronic devices' performances. Understanding the interaction mechanisms taking place when only a few QDs are assembled at a short interparticle distance is relevant to better promote the charge or energy transfer processes. Here, small hetero-assemblies formed of a few CdSe QDs of two different sizes, connected by alkyl dithiols, are fabricated in solution. The interparticle distance is tuned by varying the linear alkyl chain length of the bifunctional spacer from nanometer to sub-nanometer range. The crystallographic analysis highlights that the nearest surfaces involved in the linkage between the QDs are the (101) faces. The thorough spectroscopic investigation enables a sound rationalization of the coupling mechanism between the interacting nanoparticles, ranging from charge transfer/wavefunction delocalization to energy transfer, depending on their separation distance.

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Section: Resultsmentioning

confidence: 99%

Coupling in quantum dot molecular hetero-assemblies

Dibenedetto

Fanizza

et al. 2022

Materials Research Bulletin

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“…According to reports in the literature, CDs are described as luminescent carbon nanoparticles, and the term 'carbon dots' is derived from traditional semiconductor QDs [7]. QDs are known for their size-adjustable luminescence spectra resulting from the quantum confinement effect [8]. Essentially, reducing the size of QDs increases the bandgap energy, leading to a shift in the photoluminescence (PL) spectra, as illustrated in figure 1 [8,9].…”

Section: Background Informationmentioning

confidence: 99%

“…QDs are known for their size-adjustable luminescence spectra resulting from the quantum confinement effect [8]. Essentially, reducing the size of QDs increases the bandgap energy, leading to a shift in the photoluminescence (PL) spectra, as illustrated in figure 1 [8,9].…”

Section: Background Informationmentioning

confidence: 99%

Burning facial tissue and corroding graphite rods of recycled batteries: two simple experiments in preparation of nanomaterials

Quang

2024

Phys. Educ.

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This report presents two hands-on activities for high school students that focus on the preparation of nanomaterials in a relatively simple manner. Carbon dots (CDs) were chosen as a demonstration. The article is categorised into two parts. The first part roughly performs the same work as a previous publication by Jumeng Wei, in which ultrasonication was utilised to cleave paper ash. Furthermore, we also attempted to use magnetic stirring or even hand stirring as an alternative method. The second section offers a perspective on the use of an electrochemical method to prepare CDs using graphite rods from recycled batteries. In the scope of this article, instead of using high-analysis techniques to prove the availability of CDs at the nanoscale, our work aims to illustrate green, sustainable physics and demonstrate the way that synthetic physicists utilise waste materials via practical education. The designed experiment suggests an integration between physics and chemistry that might be used for the science, technology, engineering, and mathematics experience of high school students.

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“…These shortcomings limit their utility in photocatalytic reactions. Some researchers have used dye molecules and quantum dots as photosensitizers to expand the light absorption range of semiconductors. , However, the substrates obtained by this method may have an instability problem. Therefore, semiconductors need a stable source of plasma energy to achieve the photocatalytic effect.…”

Section: Introductionmentioning

confidence: 99%

Interface Design of 3D Flower-like Ag@ZnSe Composites: SERS and Photocatalytic Performance

Chu

Wang

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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In this work, we cosputtered Ag and ZnSe on a polystyrene template to form a three-dimensional (3D) Ag@ZnSe (x) structure. The 3D surface morphology and material composition that provided abundant "hot spots" were controlled by adjusting the sputtering power of the ZnSe, which was confirmed by finite-difference time-domain (FDTD) simulation. The introduction of ZnSe into the noble metal Ag also introduced a charge-transfer (CT) effect into the system, and the CT path was proven with the two-dimensional correlation spectroscopy (2D-COS)-surface-enhanced Raman scattering (SERS) technique. In addition, the substrate exhibited excellent catalytic activity due to the CT effect. The catalyzed degradation of malachite green (MG) was due to the CT effect in the system, and the catalytic process was successfully monitored by in situ SERS. Most importantly, the catalytic degradation by Ag@ZnSe (x) with different parameters was proportional to the degree of CT (ρ CT ). The SERS and catalytic mechanisms were analyzed in depth with the 2D-COS-SERS technique, which was also useful in verifying the CT process. The catalytic sites for MG were successfully monitored with the 2D-COS-SERS technique. This study provides a reference for studies of the synergistic effects of the electromagnetic mechanism and CT, as well as a new perspective on photocatalysis with dye molecules and monitoring of the catalytic processes.

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Semiconductor Quantum Dots as Components of Photoactive Supramolecular Architectures

Cited by 9 publications

References 145 publications

Coupling in quantum dot molecular hetero-assemblies

Coupling in quantum dot molecular hetero-assemblies

Burning facial tissue and corroding graphite rods of recycled batteries: two simple experiments in preparation of nanomaterials

Interface Design of 3D Flower-like Ag@ZnSe Composites: SERS and Photocatalytic Performance

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