Highly fluorescent positively charged ZnSe quantum dots for bioimaging

Moura, Igor M. R.; Filho, Paulo E. Cabral; Seabra, Maria Aparecida Barreto Lopes; Pereira, Goreti; Pereira, Giovannia A. L.; Fontes, Adriana; Santos, Beate S.

doi:10.1016/j.jlumin.2018.04.053

Cited by 25 publications

(7 citation statements)

References 61 publications

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“…Zn-based ceramic materials, including zinc oxide (ZnO), zinc sulphide (ZnS), zinc selenide (ZnSe), zinc phosphate (Zn 3 (PO 4 ) 2 ), and zinc aluminate (ZnAl 2 O 4 ), have been extensively explored in a variety of biomedical applications [7,56]. The major methods, characteristics, and biomedical applications of Zn based ceramic biomaterials are summarized (Table 1) and discussed in the following sections [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75].…”

Section: Zinc-based Ceramic Biomaterialsmentioning

confidence: 99%

Zinc-Based Biomaterials for Regeneration and Therapy

Cockerill

Wang

et al. 2019

Trends in Biotechnology

290

181

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Zinc has been described as the "calcium of the twenty-first century." Zinc-based degradable biomaterials have recently emerged thanks to their intrinsic physiological relevance, biocompatibility, biodegradability, and pro-regeneration properties. Zinc-based biomaterials mainly include metallic zinc alloys, zinc ceramic nanomaterials, and zinc metal-organic frameworks (MOFs). Metallic zinc implants degrade at a desirable rate, matching the healing pace of local tissues, and stimulating remodeling and formation of new tissues. Zinc ceramic nanomaterials are also beneficial for tissue engineering and therapy thanks to their nanostructures and antibacterial properties. MOFs have large surface areas and are easily functionalized, making them ideal for drug delivery and cancer therapy. This review highlights recent developments in zinc-based biomaterials, discusses obstacles to overcome, and pinpoints directions for future research.

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Section: Zinc-based Ceramic Biomaterialsmentioning

confidence: 99%

Zinc-Based Biomaterials for Regeneration and Therapy

Cockerill

Wang

et al. 2019

Trends in Biotechnology

290

181

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“…Zinc selenide in a thin film and single crystal form is a promising material for technological applications that include bioimaging [1], photovoltaics [2][3][4] and laser resonators [5]. Recently, highly blue fluorescent cysteamine coated ZnSe quantum dots in aqueous medium have been prepared at near physiological pH by a fast precipitation process followed by hydrothermal growth technique.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of electrical performance of ZnSe thin films via Au nanosandwiching

Qasrawi

Taleb

2020

Materials Science-Poland

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In this work, we report the effect of sandwiching of Au nanosheets on the structural and electrical properties of ZnSe thin films. The ZnSe films which are grown by the thermal evaporation technique onto glass and yttrium thin film substrates exhibit lattice deformation accompanied with lattice constant extension, grain size reduction and increased defect density upon Au nanosandwiching. The temperature dependent direct current conductivity analysis has shown that the 70 nm thick Au layers successfully increased the electrical conductivity by three orders of magnitude without causing degeneracy. On the other hand, the alternating current conductivity studies in the frequency domain of 10 MHz to 1800 MHz have shown that the alternating current conduction in ZnSe is dominated by both of quantum mechanical tunneling and correlated barrier hopping of electrons over the energy barriers formed at the grain boundaries. The Au nanosheets are observed to increase the density of localized states near Fermi level and reduce the average hopping energy by ~5 times. The conductivity, capacitance, impedance and reflection coefficient spectral analyses have shown that the nanosandwiching of Au between two layers of ZnSe makes the zinc selenide more appropriate for electronic applications and for applications which need microwave cavities.

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“…Similarly to CdSe NCs, the ZnSe QDs can be synthesized with a sufficiently narrow size distribution, which is possible to control by temperature [20]. Due to ZnSe's lower toxicity, compared to many other II-VI semiconductors, these QDs turn out to be attractive objects also for biosensing [21].…”

Section: Introductionmentioning

confidence: 99%

Exciton-Photon Interactions in Semiconductor Nanocrystals: Radiative Transitions, Non-Radiative Processes and Environment Effects

Бурдов

Vasilevskiy

2021

Applied Sciences

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In this review, we discuss several fundamental processes taking place in semiconductor nanocrystals (quantum dots (QDs)) when their electron subsystem interacts with electromagnetic (EM) radiation. The physical phenomena of light emission and EM energy transfer from a QD exciton to other electronic systems such as neighbouring nanocrystals and polarisable 3D (semi-infinite dielectric or metal) and 2D (graphene) materials are considered. In particular, emission decay and FRET rates near a plane interface between two dielectrics or a dielectric and a metal are discussed and their dependence upon relevant parameters is demonstrated. The cases of direct (II–VI) and indirect (silicon) band gap semiconductors are compared. We cover the relevant non-radiative mechanisms such as the Auger process, electron capture on dangling bonds and interaction with phonons. Some further effects, such as multiple exciton generation, are also discussed. The emphasis is on explaining the underlying physics and illustrating it with calculated and experimental results in a comprehensive, tutorial manner.

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Highly fluorescent positively charged ZnSe quantum dots for bioimaging

Cited by 25 publications

References 61 publications

Zinc-Based Biomaterials for Regeneration and Therapy

Zinc-Based Biomaterials for Regeneration and Therapy

Enhancement of electrical performance of ZnSe thin films via Au nanosandwiching

Exciton-Photon Interactions in Semiconductor Nanocrystals: Radiative Transitions, Non-Radiative Processes and Environment Effects

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