Quantum Nanostructures (QDs): An Overview

Kumar, Dharmendra; Kumar, B. Jai; Mahesh, H.M.

doi:10.1016/b978-0-08-101975-7.00003-8

Cited by 89 publications

(38 citation statements)

References 34 publications

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“…Because of their structure, they tightly confine electrons, and variance in their structure, mainly their size, can change the optoelectronic properties. Larger QDs emit long wavelengths in the orange and red while smaller QDs emit smaller wavelengths in the blue and green . QDs are traditionally composed of group IV and II–V compounds, but recent work has also found that elemental composition is possible, with carbon dots being a primary example .…”

Section: Detection Methodsmentioning

confidence: 99%

Microfluidic Paper-Based Analytical Devices: From Design to Applications

et al. 2021

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Microfluidic paper-based analytical devices (μPADs) have garnered significant interest as a promising analytical platform in the past decade. Compared with traditional microfluidics, μPADs present unique advantages, such as easy fabrication using established patterning methods, economical cost, ability to drive and manipulate flow without equipment, and capability of storing reagents for various applications. This Review aims to provide a comprehensive review of the field, highlighting fabrication methods available to date with their respective advantages and drawbacks, device designs and modifications to accommodate different assay needs, detection strategies, and the growing applications of μPADs. Finally, we discuss how the field needs to continue moving forward to realize its full potential.

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Section: Detection Methodsmentioning

confidence: 99%

Microfluidic Paper-Based Analytical Devices: From Design to Applications

et al. 2021

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“…An interesting route for visible-light-driven photopolymerization consists of using the emission of fluorescent nanoparticles upon excitation with shorter or longer wavelengths. For example, quantum dots (QDs) are fluorescent semiconductor nanocrystals able to emit visible light of a certain wavelength (depending on the size of the QDs) upon excitation by UV light. − Polymerization can thus be initiated by the emitted fluorescence light using a suitable initiator that is activated by visible but not by UV light . On the other hand, visible-light-driven photopolymerization can also be achieved upon upconversion.…”

Section: Photopolymerization Of Mipsmentioning

confidence: 99%

Photopolymerization and Photostructuring of Molecularly Imprinted Polymers

Paruli

Soppera

Haupt

et al. 2021

ACS Appl. Polym. Mater.

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Over the past few decades, molecularly imprinted polymers (MIPs) have become extremely attractive materials for biomimetic molecular recognition due to their excellent affinity and specificity, combined with robustness, easy engineering, and competitive costs. MIPs are synthetic antibody mimics obtained by the synthesis of 3D polymer networks around template molecules, thus generating specific binding cavities. Numerous efforts have been made to improve the performances and the versatility of MIPs, with a special focus on ways to control their size, morphology, and physical form for a given application. Gaining control over these parameters has allowed MIPs to adopt a defined micro- and nanostructure, providing access to nanocomposites and micro/nanosystems, with fine-tuned properties, which become critical for modern applications ranging from chemical sensing to bioimaging and medical therapy. In this rich and complex context, light as a cheap and versatile source of energy has emerged as a powerful tool for structuring MIPs. This review presents the most recent advances on structuring MIPs at the nano/microscale, using light as a stimulus to trigger the polymerization process. Thus, after a general introduction on radical polymerization of MIPs, with a special emphasis on photopolymerization by UV and visible light, the reader will be presented with ways of structuring MIPs by processes that are inherently spatially confined, such as localized photopolymerization and lithographic techniques, supported by representative examples and complemented with a final outlook on future trends in this field.

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“…In semiconductor QDs (s-QDs), the quantum confinement is the prevailing effect at nanoscale around 10 nm and quantized energy levels appear in the semiconductor energy gap [4]. When photon energy greater than its bandgap impinges on QDs produces an electron-hole pair (or exciton) state [5]. The excited electrons relax to the ground state releasing photons of energy in the range from ultraviolet (UV) to near-infrared (NIR) range [6].…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of quantum dots and their usage in solar cells: insight from the novel researches

et al. 2021

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Quantum dots (QDs) are three-dimensional (3D) quantum confinement materials with confined size on the nanoscale. They are semiconductors, possessing a tunable energy gap in the range of visible light energy. In QDs, the 3D quantum confinements of excitons result in tunable fluorescence emission relying upon the QDs size and shape when excited by monochromatic light. Besides, the attempts to improve their outstanding optoelectronic properties, i.e. superior to those of bulk, thin-film semiconductor and organic dyes, many efforts have been conducted, in recent times, regarding sustainable QDs synthesis aiming at biocompatibility and cost reduction. Among the green synthesis routes of QDs there are two distinguished; namely inorganic QDs and carbon-based QDs. The first route is made of low-bandgap metal chalcogenide either extracted from a living being, e.g. earthworm, or capped with an organic ligand. While, the second route is made of carbon-core and passivating the surface with different functional groups, namely carboxyl, hydroxyl, in addition to amine. These functional groups are derived from coke or organic carbon reservoir, i.e. fruits and their juice, animal, vegetable, spice and waste paper. Numerous fundamental applications of QDs, such as biomedicine, sensing, catalysis, and solar cells, exploit the characteristic fluorescence emission of QDs, quantum yields and their modulation upon interaction with the external environment. In this review, two prototype QDs examples are used to highlight the route to sustainable QDs synthesis and solar cells implementation and some perspectives.

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Quantum Nanostructures (QDs): An Overview

Cited by 89 publications

References 34 publications

Microfluidic Paper-Based Analytical Devices: From Design to Applications

Microfluidic Paper-Based Analytical Devices: From Design to Applications

Photopolymerization and Photostructuring of Molecularly Imprinted Polymers

Biosynthesis of quantum dots and their usage in solar cells: insight from the novel researches

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