Photochemical studies of monodispersed YPO 4 :Eu microspheres: The role of surface modification on structural and luminescence properties

Ansari, Anees A.

doi:10.1016/j.jphotochem.2017.04.021

Cited by 23 publications

(4 citation statements)

References 47 publications

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“…[ 17,19,31,33,41 ] A weak narrow intensity peak located at 418 cm −1 is indorsed to the asymmetric/symmetric stretching vibrational modes of the metal–oxygen ( ν M–O) network. [ 24,42 ]…”

Section: Resultsmentioning

confidence: 99%

Facile synthesized NaGdF₄:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres

2022

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A facile method was used for the synthesis of peanut-shaped very emissive NaGdF 4 : Yb, Er upconversion nanospheres (UCNSs) at lower temperatures with uniform size distribution. Crystallographic structure, phase purity, morphology, thermal robustness, biocompatibility, colloidal stability, surface chemistry, optical properties, and luminesce properties were explored by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), zeta potential, thermogravimetric/differential thermal analysis (TGA/DTA), Fourier-transform infrared (FTIR), ultraviolet (UV)-visible and photoluminescence spectroscopic tools. XRD pattern verified the construction of a single-phase, highly-crystalline NaGdF 4 phase with a hexagonal structure. Peanut-shaped morphology of the sample was obtained from SEM micrographs which were validated from high-resolution TEM images, to have an equatorial diameter of 170 to 200 nm and a length of 220 to 230 nm, with irregular size, monodispersed, porous structure, and rough surface of the particles. The positive zeta potential value exhibited good biocompatibility along with high colloidal stability as observed from the absorption spectrum. The prepared UCNSs revealed high dispersibility, irregular size peanut-shaped morphology, rough surface, good colloidal stability, and excellent biocompatibility in aqueous media. A hexagonal phase NaGdF 4 doped with ytterbium (Yb) and erbium (Er) UCNSs revealed the characteristics of highly dominant emissions located at 520-525, 538-550, and 659-668 nm corresponding to the 2 H 11/2 ! 4 I 15/2 , 4 S 3/2 ! 4 I 15/2 , and 4 F 9/2 ! 4 I 15/2 transition of Er 3+ ions, respectively, as a result of energy transfer from sensitizer Yb 3+ ion to emitter Er 3+ ion.

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Section: Resultsmentioning

confidence: 99%

Facile synthesized NaGdF₄:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres

2022

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“…In particular, rare-earth metals have gained prominence in high-tech sectors such as new materials and electronics, and they are recognized as strategic resources by numerous nations worldwide [ 4 ]. Among the diverse avenues of research into functional rare-earth materials, the investigation of luminescent rare-earth materials holds paramount importance [ 5 , 6 , 7 , 8 , 9 ]. Owing to the limited molar absorptivity (less than 10 L mol −1 cm −1 ) of trivalent lanthanide ions and the forbidden f-f transitions, only a minute fraction of radiation directly excites the 4f level of rare-earth ions, resulting in feeble luminescence.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Mesoporous and Hollow SiO2@ Eu(TTA)3phen with Enhanced Fluorescence Properties

Wang

Yang

et al. 2023

Materials

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Lanthanide ions are extensively utilized in optoelectronic materials, owing to their narrow emission bandwidth, prolonged lifetime, and elevated fluorescence quantum yield. Inorganic non-metallic materials commonly serve as host matrices for lanthanide complexes, posing noteworthy challenges regarding loading quantity and fluorescence performance stability post-loading. In this investigation, an enhanced Stöber method was employed to synthesize mesoporous hollow silica, and diverse forms of SiO2@Eu(TTA)3phen (S@Eu) were successfully prepared. Transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) outcomes revealed the effective binding of silica with Eu(TTA)3phen through both physical adsorption and chemical bonding. This includes the formation of Si-O-C bonds between silica and the ligand, as well as Si-O-Eu bonds between silica and europium ions. Fluorescence tests demonstrated that the mesoporous SiO2@Eu(TTA)3phen(MS@Eu) composite exhibited the highest fluorescence intensity among the three structured silica composites, with a notable enhancement of 46.60% compared to the normal SiO2@Eu(TTA)3phen composite. The Brunauer–Emmett–Teller (BET) analysis indicated that the specific surface area plays a crucial role in influencing the fluorescence intensity of SiO2@Eu(TTA)3phen, whereby the prepared mesoporous hollow silica further elevated the fluorescence intensity by 61.49%. Moreover, SiO2@Eu(TTA)3phen demonstrated 11.11% greater cyclic stability, heightened thermal stability, and enhanced alkaline resistance relative to SiO2@Eu(TTA)3phen.

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“…Currently, oxygen-derived nanomaterials are acquiring an enormous interest in the field of applied material as well as technological fields, owing to their superior optical and electrical, magnetic, and catalytic capabilities [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Perovskites (ABO 3 ) are oxygen-deficient compounds, in which A is a larger size connected with 12 coordination sites and B has a six folded coordination and reduced cation in diameter with O 2 anion [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Perovskite Nanoparticles as an Electrochemical Sensing Platform for Detection of Warfarin

Ansari

Alam

2022

Biosensors

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Chemically prepared PrAlO3 perovskite nanoparticles (NPs) were applied for the electrochemical detection of warfarin, which is commonly utilized for preventing blood clots, such as in deep vein thrombosis. PrAlO3 perovskite NPs were synthesized by the co-precipitation process at environmental conditions. Crystallographic structure, phase purity, morphological structure, thermal stability, optical properties, and electrochemical characteristics were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, UV-visible analysis, and cyclic voltammetry techniques. TEM micrographs showed the highly crystalline structure, smooth surface, irregular shape, and size of nanocrystalline particles with an average size of 20–30 nm. Particularly crystalline perovskite NPs were pasted on glassy carbon electrodes (GCE) to electrochemically detect the warfarin contents in liquid samples. The fabricated electrode was electrochemically characterized by different parameters such as different potential, scan rates, same potential with seven consecutive cycles, time response, real-time sample analysis, and as a function of warfarin concentration in phosphate buffer solution (0.1 M PBS, pH 7.2). The electrochemical electrode was further verified with various potentials of 5, 10, 20, 50, 100, and 150 mV/s, which exhibited sequential enhancements in the potential range. For detecting warfarin over a wide concentration range (19.5 µM–5000 µM), the detection devices offered good sensitivity and a low limit of detection (19.5 µM). The time-dependent influence was examined using chronoamperometry (perovskite NPs/GCE) in the absence and presence of warfarin at four distinct voltages of +0.05 to +1.2 V from 0 to 1000 s. The repeatability and reliability of the constructed electrochemical sensing electrode were also evaluated in terms of cyclic response for 30 days, demonstrating that it is substantially more reliable for a longer period. The fabricated perovskite NPs/GCE electrodes could be employed for the rapid identification of other drugs.

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Photochemical studies of monodispersed YPO 4 :Eu microspheres: The role of surface modification on structural and luminescence properties

Cited by 23 publications

References 47 publications

Facile synthesized NaGdF₄:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres

Facile synthesized NaGdF₄:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres

Synthesis of Mesoporous and Hollow SiO2@ Eu(TTA)3phen with Enhanced Fluorescence Properties

Perovskite Nanoparticles as an Electrochemical Sensing Platform for Detection of Warfarin

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Photochemical studies of monodispersed YPO 4 :Eu microspheres: The role of surface modification on structural and luminescence properties

Cited by 23 publications

References 47 publications

Facile synthesized NaGdF4:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres

Facile synthesized NaGdF4:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres

Synthesis of Mesoporous and Hollow SiO2@ Eu(TTA)3phen with Enhanced Fluorescence Properties

Perovskite Nanoparticles as an Electrochemical Sensing Platform for Detection of Warfarin

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Facile synthesized NaGdF₄:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres

Facile synthesized NaGdF₄:Yb,Er peanut‐shaped, highly biocompatible, colloidal upconversion nanospheres