p-Aminobenzoic acid (pABA) sensitization of LaF<sub>3</sub>:Tb<sup>3+</sup> nanoparticles and its applications in the detection of explosive materials

Ghosh, Debidas; Luwang, Meitram Niraj

doi:10.1039/c4ra15304a

Cited by 30 publications

(19 citation statements)

References 57 publications

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“…The above‐mentioned studies show the selective and sensitive detection of nitro explosives via quenching of the anti‐Stokes emission (i.e., upconversion) using NIR excitation (e.g., 980 nm). However, a limitation of these methods is the comparatively low upconversion intensity, in particular in water, due to the vibrational overtones of −OH groups present in the medium . In addition, these methods involve the use of gold nanoparticles and in some cases further functionalization with a polymer making the system rather complex.…”

Section: Methodsmentioning

confidence: 99%

A Luminescent Nanocrystal Marker for the Selective and Ultrasensitive Detection of Explosives

et al. 2016

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We developed al uminescentp robe for the selective and sensitive detection of an explosive, i.e.,p icric acid (PA), based on the luminescence quenching of Ce III and Tb III co-doped Sr 2 GdF 7 nanocrystals. An ew colloidal synthesis route at low temperature (80 8C) was developed to synthesize the luminescentn anocrystals host matrix Sr 2 GdF 7 .T he nanocrystals showeds trong green emission under UV excitation (290 nm) by efficient energy transfer from Ce III to Tb III ions. The functionalization of the nanocrystals with l-cysteine (Cys) rendered the luminescent probe water dispersible. The presence of the ÀNH 2 groups of Cys allowed the selectivei nteraction of the probe with PA among other nitro explosives. This caused a9 2% reduction of the photoluminescence intensity of Tb III in the Sr 2 GdF 7 nanocrystals, and led to the selectived etection of PA with an unprecedented limit of detection (LOD) of approx. 4nm.

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Section: Methodsmentioning

confidence: 99%

A Luminescent Nanocrystal Marker for the Selective and Ultrasensitive Detection of Explosives

et al. 2016

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“…Displaying intense green luminescence when excited at 340 nm. [21,22] The emission of Tb 3+ is owing to transitions amidst the excited 5 located in sites with inversion symmetry the yellow emission is zero since electric-dipole transitions are forbidden in those sites. [24,25] In the present system, the yellow 4 F 9/2 -6 H 13/2 emission at 581 nm is slightly more intensified than the blue 4 formula, which is given by [26] CCT ¼ −449n 3.5.4 | Sm 3+ luminescence in LaF 3 Figure 11 presents the emission spectra of…”

Section: Tb 3+ Luminescence In Lafmentioning

confidence: 99%

Trivalent rare‐earth activated hexagonal lanthanum fluoride (LaF₃:RE³⁺, where RE = Tb, Sm, Dy and Tm) nanocrystals: Synthesis and optical properties

2018

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The LaF nanocrystals through a facile hydrothermal route with hexagonal structures have been synthesized via doping of trivalent rare earth (RE ) ions - RE = Tb, Sm, Dy and Tm - with rod-like and perforated morphologies using NH F as fluorine precursor. Hexagonal phase formation was confirmed by powder X-ray diffraction. The crystalline sizes were calculated by the Scherrer equation where found to have an average crystalline size of 12 to 35 nm. The morphological studies of the nanocrystals were carried out by means of transmission electron microscopy (TEM). The LaF :Tm ,Sm ions show the characteristic emission of Tb and Tm respectively. In Sm -doped LaF , three prominent emission peaks at 561, 597 and 641 nm were found, which belong to G → H , G → H (magnetic dipole) and G → H (electric dipole) transitions, respectively. The Dy activated LaF shows blue and yellow emission and the corresponding CIE color coordinate show white light emission (CCT value 10650 K).

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“…[21][22][23][24] In recent times, scientists from all over the world have designed different types of colorimetric and fluorescent chemosensors of fluoride ion. [25][26][27][28][29][30][44][45][46][47][52][53][54][55][56][57][58][59][60][61][62][63][64][65]69] But gel-based detection is very less. [31][32][33][34] In general, using fluorescence-based sensors, we can easily detect very less quantity of fluoride in the range of 1-100 ppb [25][26]30,[44][45] as well as in the higher range 100-1000 ppb.…”

Section: Introductionmentioning

confidence: 99%

A Metallogel Based on a Zwitterionic Spirocyclic Meisenheimer Complex: Sensing of Fluoride Ions in Water and Moisture Content in Organic Solvents

Mohar

2019

ChemistrySelect

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Design and synthesis of stimuli‐responsive materials are highly desired for various practical applications. For this purpose, a picric acid and N,N′‐dicyclohexylcarbodiimide based highly rigid zwitterionic spirocyclic Meisenheimer complex has been applied to produce a metallogel. The Meisenheimer complex does not undergo self‐gelation under any condition. But it forms a stable gel only with Fe3+ ion in a 2:1 ratio in chloroform. Interestingly, the Meisenheimer complex shows bright yellow emission under 366 nm UV light. But the Fe3+ based metallogel does not show any emission under UV irradiation. However, in the presence of fluoride contaminated water, the metallogel surface shows bright yellow emission while checking inside a UV chamber. Thus the non‐fluorescent metallogel was utilized as a sensor of aqueous fluoride ion. The sensor is able to detect aqueous fluoride down to 156 ppb concentration. Like the gel, the dried metallogel solution is also non‐fluorescent in different polar as well as nonpolar organic solvent. But the same solution shows bright yellow emission in the presence of water. The fluorescence intensity was found to increase with an increase in the percentage of water. In this way, the xerogel was utilized as a sensor of undesired water content present in different organic solvents which can detect moisture content with a minimum detection limit of 0.04% for dichloromethane.

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p-Aminobenzoic acid (pABA) sensitization of LaF₃:Tb³⁺ nanoparticles and its applications in the detection of explosive materials

Abstract: “A novel approach for detecting highly explosive aromatic nitro compounds utilizing pABA sensitised terbium (Tb3+) doped spherical LaF3 nanoparticles.”

Cited by 30 publications

References 57 publications

A Luminescent Nanocrystal Marker for the Selective and Ultrasensitive Detection of Explosives

A Luminescent Nanocrystal Marker for the Selective and Ultrasensitive Detection of Explosives

Trivalent rare‐earth activated hexagonal lanthanum fluoride (LaF₃:RE³⁺, where RE = Tb, Sm, Dy and Tm) nanocrystals: Synthesis and optical properties

A Metallogel Based on a Zwitterionic Spirocyclic Meisenheimer Complex: Sensing of Fluoride Ions in Water and Moisture Content in Organic Solvents

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p-Aminobenzoic acid (pABA) sensitization of LaF3:Tb3+ nanoparticles and its applications in the detection of explosive materials

Abstract: “A novel approach for detecting highly explosive aromatic nitro compounds utilizing pABA sensitised terbium (Tb3+) doped spherical LaF3 nanoparticles.”

Cited by 30 publications

References 57 publications

A Luminescent Nanocrystal Marker for the Selective and Ultrasensitive Detection of Explosives

A Luminescent Nanocrystal Marker for the Selective and Ultrasensitive Detection of Explosives

Trivalent rare‐earth activated hexagonal lanthanum fluoride (LaF3:RE3+, where RE = Tb, Sm, Dy and Tm) nanocrystals: Synthesis and optical properties

A Metallogel Based on a Zwitterionic Spirocyclic Meisenheimer Complex: Sensing of Fluoride Ions in Water and Moisture Content in Organic Solvents

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Product

Resources

About

p-Aminobenzoic acid (pABA) sensitization of LaF₃:Tb³⁺ nanoparticles and its applications in the detection of explosive materials

Trivalent rare‐earth activated hexagonal lanthanum fluoride (LaF₃:RE³⁺, where RE = Tb, Sm, Dy and Tm) nanocrystals: Synthesis and optical properties