Combined small- and wide-angle X-ray scattering studies on oxide-supported Pt nanoparticles prepared by a CVS and CVD process

Guo, Xiaoai; Gao, Kun; Gutsche, Alexander; Seipenbusch, Martin; Nirschl, Hermann

doi:10.1016/j.powtec.2014.11.028

Cited by 16 publications

(14 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured SAXS data were modeled using a commonly named global unified fit model [35,36]. In fact, this model includes a power-law regime in order to describe the mass or surface fractal and a Guinier regime to characterize the mean structural size, given by:…”

Section: Saxs Analysesmentioning

confidence: 99%

“…In case nanoparticles have a log-normal size distribution, in order to characterize the particle size distribution from the SAXS data, three fitting parameters, Rg, G, and B are often used. The geometric standard deviation (σ g ) in this case is given by [36]:…”

Section: Saxs Analysesmentioning

confidence: 99%

“…From the log I(q) versus log q curves and slopes of linear region (at large values of scattering vector q), the values of the exponent P can be measured. In order to study particle surface characteristics like roughness, the surface-fractal dimension or d s (d s = 6 − P) is often used [36,37]. This is in particular useful for ideal two-phase structure with smooth surfaces and sharp boundaries.…”

Section: Saxs Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

View full text Add to dashboard Cite

This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

show abstract

Section: Saxs Analysesmentioning

confidence: 99%

Section: Saxs Analysesmentioning

confidence: 99%

Section: Saxs Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[15][16][17][18][19][20][21] Many experimental studies [22][23][24][25][26][27] of heterogeneous catalytic processes adapted fractal analysis to show that the fractal nature of the active phase may be responsible for the variation in reactivity. The basic characteristic of fractal systems is their fractal dimension which can be determined with the help of various methods such as adsorption, 28,29 small angle scattering (SAXS and SANS), 30,31 porometry, 32 electron microcopy, 33,34 atomic force microscopy, 35 etc.…”

Section: Introductionmentioning

confidence: 99%

Fractal analysis of pre-reduced Pt/TiO₂catalysts for formaldehyde oxidation

Peng

Wang

2017

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…In our system the IP detector allows the detection of scattering intensity over a wide range of 2 (up to 90 ), i.e. small-and wide-angle X-ray scattering analyses can be performed simultaneously (Guo, Gutsche, Wagner et al, 2013;Guo, Gao et al, 2015;Guo, Wagner et al, 2015). Besides these advantages the IP detector is cost effective and reusable.…”

Section: Introductionmentioning

confidence: 99%

Probing the absolute scattering intensity by means of a laboratory-based small-angle X-ray scattering camera using an imaging plate detector

et al. 2016

Self Cite

View full text Add to dashboard Cite

This paper deals with the application of an imaging plate (IP) detector for probing absolute intensities in small‐angle X‐ray scattering experiments. The IP detector is used with an in‐house modified Kratky camera. It is shown that the normalization of scattering data to the transmitted primary beam intensity properly compensates for various unwanted features typically associated with the IP detector, e.g. the fading effect and poorly reproducible scanning times, promoting precise absolute intensity calibration. The absolute intensity calibration was performed by measuring a large number of different silica sols serving as secondary standards. The calibration factor, which converts the measured data into absolute units, was determined by the average over the data obtained for different silica sols, providing a precise calibration of the IP detector. In particular, it is shown that silica sols do not require application of synchrotron radiation or a long exposure time as typically needed if pure liquids or standard proteins are used as secondary standards. To check the applicability of the IP detector in a real synthesis, Stöber silica particles were synthesized under various reaction conditions and the scattering intensity was probed and converted into absolute units. The volume fractions and the number densities of silica particles provided by the absolute intensities showed a good agreement with theoretical values predicted for the different reaction conditions. Therefore, the IP detector can be used for accurate probing of absolute intensities.

show abstract

Combined small- and wide-angle X-ray scattering studies on oxide-supported Pt nanoparticles prepared by a CVS and CVD process

Cited by 16 publications

References 54 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Fractal analysis of pre-reduced Pt/TiO₂catalysts for formaldehyde oxidation

Probing the absolute scattering intensity by means of a laboratory-based small-angle X-ray scattering camera using an imaging plate detector

Contact Info

Product

Resources

About

Combined small- and wide-angle X-ray scattering studies on oxide-supported Pt nanoparticles prepared by a CVS and CVD process

Cited by 16 publications

References 54 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Fractal analysis of pre-reduced Pt/TiO2catalysts for formaldehyde oxidation

Probing the absolute scattering intensity by means of a laboratory-based small-angle X-ray scattering camera using an imaging plate detector

Contact Info

Product

Resources

About

Fractal analysis of pre-reduced Pt/TiO₂catalysts for formaldehyde oxidation