Synthesis of NaYF4:Yb,Er@SiO2@Ag core-shell nanoparticles for plasmon-enhanced upconversion luminescence in bio-applications

Grigory, Arzumanyan; Linnik, Dmitriy; Маматкулов, К. З.; Vorobyeva, Maria; Korsun, Anastasia; Glasunova, Valentina; Jevremović, Anka

doi:10.29328/journal.abse.1001006

Cited by 3 publications

(4 citation statements)

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“…This was caused by the aggregation of SiO 2 nanoparticles, which hindered the impinging light from being absorbed by the phosphors and the emitted light from being transmitted. The influence of SiO 2 coating on the NaYF 4 :(Yb 3+ , Er 3+ ) UCNP has been reported in earlier research [1,2,[15][16][17][18]. It is known that SiO 2 coating causes the NaYF 4 :(Yb 3+ , Er 3+ ) UCNP to protect UCNP from dissolution [1,15], to improve the temperature stability [2], to restore the chemical activity in aqueous media [16], to protect core from degradation in proteolytic solvents [17], and to enhance the adhesion of metal particles.…”

Section: Resultsmentioning

confidence: 65%

“…The influence of SiO 2 coating on the NaYF 4 :(Yb 3+ , Er 3+ ) UCNP has been reported in earlier research [1,2,[15][16][17][18]. It is known that SiO 2 coating causes the NaYF 4 :(Yb 3+ , Er 3+ ) UCNP to protect UCNP from dissolution [1,15], to improve the temperature stability [2], to restore the chemical activity in aqueous media [16], to protect core from degradation in proteolytic solvents [17], and to enhance the adhesion of metal particles. But, as a whole, these studies report a decrease in PL intensities after SiO 2 coating on the NaYF 4 :(Yb 3+ , Er 3+ ) UCNP.…”

Section: Resultsmentioning

confidence: 65%

“…Our samples consist of SiO 2 nanoparticles coated on upconversion microsized phosphors(UCMP), in contrast to those reported in earlier research [1,2,[15][16][17][18]. Our NaYF 4 :(Yb 3+ , Er 3+ ) UCMP is not a but a bulky particle with lots of surface defects.…”

Section: Resultsmentioning

confidence: 94%

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Silica Nanoparticle Coating of NaYF₄:(Yb³⁺, Er³⁺) Upconversion Phosphor

Jang

Kim

Sohn

2022

Journal of Nanomaterials

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To improve its light conversion efficiency, NaYF4:(Yb3+, Er3+) upconversion (UC) phosphor, which generates one visible photon by absorbing two or more near-infrared photons, was coated with SiO2 nanoparticles. The surface modification of phosphor was performed by using a modified sol–gel method as a function of the concentration of colloidal silica employed as the surface coating precursor. It was found that the PL intensities depend on the concentration of colloidal silica. When a 2.7 wt% concentration of colloidal silica was used, the NaYF4:(Yb3+, Er3+) phosphor exhibited a homogeneous coating with silica and an approximately 9% increase in the PL intensity, as compared with that of the non-coated sample of NaYF4:(Yb3+, Er3+) phosphor. This increase in the PL intensity can be explained by the suppression of the nonradiative recombination of electron–hole pairs via surface defects. The experimental results suggest that the surface modification of upconversion phosphors with a silica coating of the appropriate concentration is a simple and effective solution to improve the light conversion efficiency of upconversion phosphors used in optoelectronic devices.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 65%

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Silica Nanoparticle Coating of NaYF₄:(Yb³⁺, Er³⁺) Upconversion Phosphor

Jang

Kim

Sohn

2022

Journal of Nanomaterials

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Section: Figurementioning

confidence: 99%

Chitosan-Based Particulate Carriers: Structure, Production and Corresponding Controlled Release

2023

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The state of the art in the use of chitosan (CS) for preparing particulate carriers for drug delivery applications is reviewed. After evidencing the scientific and commercial potentials of CS, the links between targeted controlled activity, the preparation process and the kinetics of release are detailed, focusing on two types of particulate carriers: matrix particles and capsules. More precisely, the relationship between the size/structure of CS-based particles as multifunctional delivery systems and drug release kinetics (models) is emphasized. The preparation method and conditions greatly influence particle structure and size, which affect release properties. Various techniques available for characterizing particle structural properties and size distribution are reviewed. CS particulate carriers with different structures can achieve various release patterns, including zero-order, multi-pulsed, and pulse-triggered. Mathematical models have an unavoidable role in understanding release mechanisms and their interrelationships. Moreover, models help identify the key structural characteristics, thus saving experimental time. Furthermore, by investigating the close relation between preparation process parameters and particulate structural characteristics as well as their effect on release properties, a novel “on-demand” strategy for the design of drug delivery devices may be developed. This reverse strategy involves designing the production process and the related particles’ structure based on the targeted release pattern.

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Upconversion nanomaterials for photocatalytic applications

Kumar

Chand

Krishnan

2022

Upconversion Nanophosphors

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Synthesis of NaYF4:Yb,Er@SiO2@Ag core-shell nanoparticles for plasmon-enhanced upconversion luminescence in bio-applications

Abstract: A, et al. Synthesis of NaYF 4 :Yb,Er@SiO 2 @Ag coreshell nanoparticles for plasmon-enhanced upconversion luminescence in bio-applications.

Cited by 3 publications

References 39 publications

Silica Nanoparticle Coating of NaYF₄:(Yb³⁺, Er³⁺) Upconversion Phosphor

Silica Nanoparticle Coating of NaYF₄:(Yb³⁺, Er³⁺) Upconversion Phosphor

Chitosan-Based Particulate Carriers: Structure, Production and Corresponding Controlled Release

Upconversion nanomaterials for photocatalytic applications

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Synthesis of NaYF4:Yb,Er@SiO2@Ag core-shell nanoparticles for plasmon-enhanced upconversion luminescence in bio-applications

Abstract: A, et al. Synthesis of NaYF 4 :Yb,Er@SiO 2 @Ag coreshell nanoparticles for plasmon-enhanced upconversion luminescence in bio-applications.

Cited by 3 publications

References 39 publications

Silica Nanoparticle Coating of NaYF4:(Yb3+, Er3+) Upconversion Phosphor

Silica Nanoparticle Coating of NaYF4:(Yb3+, Er3+) Upconversion Phosphor

Chitosan-Based Particulate Carriers: Structure, Production and Corresponding Controlled Release

Upconversion nanomaterials for photocatalytic applications

Contact Info

Product

Resources

About

Silica Nanoparticle Coating of NaYF₄:(Yb³⁺, Er³⁺) Upconversion Phosphor

Silica Nanoparticle Coating of NaYF₄:(Yb³⁺, Er³⁺) Upconversion Phosphor