Nanocrystalline GdVO4: Synthesis, characterization, optical and photocatalytic properties

Vosoughifar, Mohammad

doi:10.1007/s10854-016-6289-0

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…Whereas without RGB pigment, Fe 3 O 4 MPNs had maximum saturation magnetization with the value of about 50 emu g −1 , the respective M(H) curve is shown in Figure S10a, Supporting Information, under the same magnetic field and temperature conditions, which gradually decreased to 3.68 emu g −1 by adding the quantity of RGB pigment in the MLSP whose saturation magnetization is about 0.1 emu g −1 , M(H) curve shown in Figure S10b, Supporting Information. The RGB is comprised of Zn 0.98 Cu 0.02 S particles, where ZnS shows ferromagnetic behavior with very low saturation magnetization that varies upon the doping concentration of Cu [ 43 ] but in case of Gd 0.8 Eu 0.2 VO 4 and Gd 0.87 Tm 0.03 Yb 0.1 VO 4 rods, the rods of GdVO 4 exhibit paramagnetic behavior with very less saturation magnetization [ 44 ] that's why the overall resultant saturation magnetization of RGB is very less. So, conclusively the resultant saturation magnetization is sufficient enough for the desired applications.…”

Section: Resultsmentioning

confidence: 99%

A Strategic Approach to Design Multi‐Functional RGB Luminescent Security Pigment Based Golden Ink with Myriad Security Features to Curb Counterfeiting of Passport

Kanika

Kedawat²,

Srivastava³

2023

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Authentication and verification of the most important government issued identity proof, i.e. passport has become more complex and challenging in the last few decades due to various innovations in ways of counterfeiting by fraudsters. Here, the aim is to provide more secured ink without altering its golden appearance in visible light. In this panorama, a novel advanced multi‐functional luminescent security pigment (MLSP) based golden ink (MLSI) is developed that provides an optical authentication and information encryption features to protect the legitimacy of the passport. The advanced MLSP is derived from the ratiometric combination of different luminescent materials to form a single pigment which emits red (620 nm), green (523 nm) and blue (474 nm), when irradiated via 254, 365 and 980 nm NIR wavelengths, respectively. It also includes magnetic nanoparticles to generate magnetic character recognition feature. The MLSI has been fabricated to examine its printing feasibility and stability over different substrates using the conventional screen‐printing technique against harsh chemicals and under different atmospheric conditions. Hence, these advantageous multi‐level security features with golden appearance in visible light is a new breakthrough toward curbing the counterfeiting of passport as well as bank cheques, government documents, pharmaceuticals, military equipment, and many more.

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Section: Resultsmentioning

confidence: 99%

A Strategic Approach to Design Multi‐Functional RGB Luminescent Security Pigment Based Golden Ink with Myriad Security Features to Curb Counterfeiting of Passport

Kanika

Kedawat²,

Srivastava³

2023

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“…(Teo et al, 2016;Belkina et al, 2016;Dong et al, 2015). There are many preparation methods that have been reported in the literature for obtaining GdVO 4 such us sol-gel (Chumha et al, 2014), edge-defined film-fed (EFG) (Epelbaum et al, 1998), Czochralski (Loiko et al, 2013), co-precipitation (Vosoughifar, 2017), hydrothermal (Szczeszak et al, 2014;Mahapatra & Ramanan, 2005), solvothermal (Liang et al, 2011). Among all the processes mentioned above, hydrothermal growth is one of the most promising and widely employed methods, due to the possibility of producing large crystals and the advantage of being able to control the morphology and crystal size.…”

Section: Introductionmentioning

confidence: 99%

Morphology of the GdVO₄crystal: first-principles studies

Eftimie¹,

Avram²,

Jelsch³

et al. 2020

Acta Crystallogr Sect B

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The present paper reports a theoretical investigation based on first-principles density functional theory calculations to predict the external morphology of the tetragonal GdVO4 crystal from its internal structure. The Bravais–Friedel–Donnay–Harker (BFDH) method, attachment energy (AE) method and surface energy (SE) method were used in this study. Slice energies (cohesive, attachment and specific surface) of the three main crystal faces having (110), (101) and (200) orientation and their d hkl thicknesses were computed using CRYSTAL17 code, in the frame of a 2D periodic slab model. The relative growth rate (R hkl ) and the morphological importance (MI hkl ) for each unrelaxed and relaxed (hkl) face of interest were determined. Consequently, the crystal shapes predicted based upon BFDH, AE and SE methods were represented by the Wulff construction. The results of the morphology crystal predictions, based on the above methods, were compared both against each other and against the experimentally observed morphologies. A quite satisfactory agreement between the predicted and observed crystal morphologies is noticed.

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“…Exceptional luminescence characteristics of the rare earth orthovanadate R VO 4 ( R = rare‐earth ion) make them attract considerable interests in recent years. [ 1,2 ] It is reported that the ion doped R VO 4 materials hold higher thermal conductivity, broader emission and absorption cross sections and can be widely utilized in the fields of laser material and light emitting diodes. [ 3,4 ] Through codoping Dy 3+ and Eu 3+ ions into single phase R VO 4 materials, multicolor photoluminescence including white light can be easily realized.…”

Section: Introductionmentioning

confidence: 99%

Spin‐Glass‐Like Freezing Behavior and Magnetic Anisotropy in GdVO₄ Single Crystal

Ruan

Wang

et al. 2020

Crystal Research and Technology

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The systematic magnetic properties in the zircon‐type GdVO4 single crystal are reported herein. Antiferromagnetic (AFM)‐ordered GdVO4 single crystal presents an upturn below 150 K in the H/M curves. With the decreasing of the field, the upturn behavior enhances which is probably due to spin‐glass‐like behavior that exists in this system. The short‐range order related spin‐glass‐like feature is also observed in the time‐dependent magnetization relaxation. Furthermore, the M (T) and M (H) curves of the single crystal reveal an anisotropic character with two different spin‐flop transitions along the c axis (1 T) and the a, b axes (1.7 T). Combining the high‐frequency electron spin resonance (ESR) measurement and the structure analysis, the main cause of the magnetic anisotropy can be explained as the contribution of the exchange coupling anisotropy due to the asymmetrical environment of the Gd3+ ions.

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Nanocrystalline GdVO4: Synthesis, characterization, optical and photocatalytic properties

Cited by 10 publications

References 12 publications

A Strategic Approach to Design Multi‐Functional RGB Luminescent Security Pigment Based Golden Ink with Myriad Security Features to Curb Counterfeiting of Passport

A Strategic Approach to Design Multi‐Functional RGB Luminescent Security Pigment Based Golden Ink with Myriad Security Features to Curb Counterfeiting of Passport

Morphology of the GdVO₄crystal: first-principles studies

Spin‐Glass‐Like Freezing Behavior and Magnetic Anisotropy in GdVO₄ Single Crystal

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Nanocrystalline GdVO4: Synthesis, characterization, optical and photocatalytic properties

Cited by 10 publications

References 12 publications

A Strategic Approach to Design Multi‐Functional RGB Luminescent Security Pigment Based Golden Ink with Myriad Security Features to Curb Counterfeiting of Passport

A Strategic Approach to Design Multi‐Functional RGB Luminescent Security Pigment Based Golden Ink with Myriad Security Features to Curb Counterfeiting of Passport

Morphology of the GdVO4crystal: first-principles studies

Spin‐Glass‐Like Freezing Behavior and Magnetic Anisotropy in GdVO4 Single Crystal

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Morphology of the GdVO₄crystal: first-principles studies

Spin‐Glass‐Like Freezing Behavior and Magnetic Anisotropy in GdVO₄ Single Crystal