Temperature dependent optical spectroscopy: A study of holmium diphenanthroline nitrate in DMF

Petrov, Vesselin; Danchova, Nina; Gutzov, S.

doi:10.1016/j.saa.2019.117527

Cited by 5 publications

(6 citation statements)

References 19 publications

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“…The f–f transitions and UV charge transfer transitions (CTT) of Ho 2 O 3 and Sm 2 O 3 micropowders were used as a reference. The peak maxima and intensities in the region between 250–750 nm were in a good agreement with the theory [ 50 , 51 ]. From the measured diffuse reflectance R (%), the Kubelka–Munk function F(R) was calculated [ 52 ].…”

Section: Methodssupporting

confidence: 87%

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

Donėlienė¹,

Fataraitė‐Urbonienė

Danchova

et al. 2022

Gels

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A cost-effective solution for the synthesis of high-porosity TiO2 aerogels, which can be used as a mesoporous perovskite network charge-carrier material during the manufacture of solar cells, is described. The effects of the synthesis parameters (precursor (titanium (IV) isopropoxide (TIP) and tetrabutyl orthotitanate (TBOT)), additional solvent exchange (n-hexane (nH), cyclohexane (CH), and diethyl ether (DE)), subcritical drying (800 mbar vacuum, 70 °C, 8 h), aging, and calcination on the aerogel’s structure have been investigated. Methods of XRD, FT-IR, BET, Raman, STA, SEM, UV–vis, and thermal conductivity measurements were applied to find out the relation between the synthesis conditions and the properties of the synthesized aerogels. Amorphous aerogels are polydispersed systems with the highest probability of pore diameter from 0.5 to 15 nm. An nH-exchanged, aged aerogel synthesized from the precursor TIP shows the highest diameter of pores. After calcination, the aerogels tend to crystallize into an anatase phase and the size of the crystallites depends on the precursor’s nature. Calcination leads to a significant increase in both the apparent and true density of the aerogels, and it also results in an increase in porosity and thermal conductivity.

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Section: Methodssupporting

confidence: 87%

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

Donėlienė¹,

Fataraitė‐Urbonienė

Danchova

et al. 2022

Gels

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“…Primarily, this can be explained by their different origin, that is the assignment to the 5 I 8 / 5 G 6 transition, which is expected to show distinguishable thermal variation. 70,71 Considering all accessible peaks from this pattern, we found the strongest thermal changes for peaks at 456 and 459 nm. They almost disappear at low temperatures suggesting that they can be connected with the hot bands from one of the excited m J levels of the ground 5 I 8 multiplet (Fig.…”

Section: Optical Thermometrymentioning

confidence: 85%

“…They correspond to the thermal variation of absorption peaks which can be mainly assigned to the role of thermally activated vibrational motions governing the intensity of the f-f electronic transitions. 70,71,90,91 Within this model, applying for T-dependent absorption spectra of Ho III -based systems, 70,71 the D values of 1@Y-3@Y can be presented using eqn (2):…”

Section: Optical Thermometrymentioning

confidence: 99%

“…67 In contrast, Ho 3+ ions exhibit an efficient luminescent re-absorption effect due to the numerous absorption peaks in the visible range. 68,69 Due to the presence of hot bands and variable thermal dependence of electronic transitions, the Ho III absorption peaks can be strongly T-dependent, 70,71 which is a tool for optical thermometry. 72,73 Using the re-absorption effect, these absorption peaks may be easily detected on the emission pattern of the attached luminophore.…”

Section: Introductionmentioning

confidence: 99%

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Holmium(iii) molecular nanomagnets for optical thermometry exploring the luminescence re-absorption effect

et al. 2021

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“…Peak maxima and intensities were in good agreement with the theory. From the measured diffuse reflectance R (%), the Kubelka-Munk function F(R) has been calculated [ 59 ]. The diffuse reflectance spectra of Ho 2 O 3 powders are visualized in Figure 13 .…”

Section: Methodsmentioning

confidence: 99%

Effect of Precursor Nature and Sol-Gel Synthesis Conditions on TiO2 Aerogel’s Structure

Donėlienė¹,

Fataraitė‐Urbonienė

Rudzikas³

et al. 2021

Molecules

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The aim of this investigation was to synthesize high porosity TiO2 aerogel by applying sol-gel and subcritical drying methods and to identify the influence of reagent’s nature and synthesis conditions on their structural and optical properties. Methods of XRD, FT-IR, BET, STA, SEM, and UV-vis were applied to investigate and compare the properties of synthesized TiO2 aerogels and to determine the most effective synthesis route. The structural parameters of the synthesized materials can be varied by changing the precursor type (titanium (IV), isopropoxide (TIP), or tetrabutylorthotitanate (TBOT)) and the nature of the solvent used for additional exchange (n-hexane (nH), cyclohexane (CH), or diethyl ether (DE)). All of the subcritical dried samples show the amorphous structure, which tends to crystallize into the anatase phase after calcination. The number of micro and mesopores and the specific surface area depends on the synthesis conditions. The pores with the highest diameter have been found for additionally nH exchanged and aged aerogel synthesized from precursor TIP. Despite the imperfections in the structure, the produced aerogels show structural and optical properties typical of the TiO2 structures mentioned in the literature.

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Temperature dependent optical spectroscopy: A study of holmium diphenanthroline nitrate in DMF

Cited by 5 publications

References 19 publications

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

Holmium(iii) molecular nanomagnets for optical thermometry exploring the luminescence re-absorption effect

Effect of Precursor Nature and Sol-Gel Synthesis Conditions on TiO2 Aerogel’s Structure

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