In situ X-ray diffraction study of a TiO2 nanopowder Spark Plasma Sintering under very high pressure

Cottrino, Sandrine; Gaudisson, Thomas; Pailhés, S.; Ferrara, Emanuela Archina; Mishra, Shashank; Danièle, S.; Mézouar, M.; Largeteau, Alain; Godec, Yann Le; Floch, Sylvie Le

doi:10.1016/j.jeurceramsoc.2022.11.037

Cited by 6 publications

(7 citation statements)

References 43 publications

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“…For the series using P25 as the starting material, an additional peak at 2θ = 27.6 was observed, corresponding to the (110) plane of rutile (card no. 9004143) 38 . Moreover, for the P25-Pt sample, a weak diffraction peak at 2θ = 40.1, corresponding to the (111) plane, can be seen, indicating the presence of metallic platinum (card no.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive spectroscopy and photocatalytic activity analysis of TiO2-Pt systems under LED irradiation

Kubiak

2024

Sci Rep

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This study presents a thorough spectroscopic analysis of TiO2-Pt systems under LED irradiation, with a focus on elucidating the photodeposition process of Pt nanoparticles onto TiO2 surfaces. The methodology leverages an innovative LED photoreactor tailored to a specific spectral range, enabling precise characterization of the excitation spectrum of TiO2-Pt composites. Through the identification of Pt precursor species and their excitation under LED-UV light, a photodeposition mechanism is proposed involving concurrent excitation of both the TiO2 semiconductor and the H2PtCl6 precursor. The LED photoreactors are employed to scrutinize the excitation profile of TiO2-Pt materials, revealing that the incorporation of Pt nanoparticles does not expand TiO2's absorption spectrum. Furthermore, UV-A exposure in the absence of Pt did not induce the formation of surface defects, underscoring the lack of visible light activity in TiO2-Pt systems. Spectroscopic analyses, complemented by naproxen photooxidation experiments, indicate the absence of a significant plasmonic effect in Pt nanoparticles within the experimental framework. Mass spectroscopy results corroborate the presence of distinct naproxen degradation pathways, suggesting minimal influence from photocatalyst properties. This research provides a detailed spectroscopic insight into TiO2-Pt photocatalysis, enriching the knowledge of photocatalytic materials in LED lighting.

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Section: Resultsmentioning

confidence: 99%

Comprehensive spectroscopy and photocatalytic activity analysis of TiO2-Pt systems under LED irradiation

Kubiak

2024

Sci Rep

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“…Keeping an outer and an inner graphite die and replacing the two graphite punches with two tungsten carbide (WC) [ 45 ] or silicon carbide (SiC) punches [ 44 ], 400–500 MPa can be reached. Additionally replacing the inner graphite die with WC [ 43 , 46 ] or SiC [ 47 , 48 ] does not allow 500 MPa to be exceeded on a 10 mm diameter sample. It should also be noted that the operating temperature of the WC tools is generally limited to 700 °C, whereas SiC tools allow heating up to 1300 °C [ 47 ].…”

Section: Recent Progress Of Various Hp-sps Technologiesmentioning

confidence: 99%

“…To go beyond 1 GPa, we adapted a very high-pressure module, based on a Paris–Edinburgh high-pressure cell (PE cell) [ 51 , 52 ], to standard SPS equipment [ 48 ]. In this case, a pellet (7 mm in diameter and 3 mm thick) of pre-compacted powder (at 370 MPa) is inserted into a graphite tube surrounded by a gasket made of fired pyrophyllite.…”

Section: Recent Progress Of Various Hp-sps Technologiesmentioning

confidence: 99%

“…The shrinkage observed at 400 °C corresponds to the anatase to rutile phase transition, which is lower under pressure. A 98% dense nanostructured ceramic is obtained by following the short sintering cycle up to 650 °C, shown in Figure 15 [ 48 ].…”

Section: Recent Progress Of Various Hp-sps Technologiesmentioning

confidence: 99%

“…We followed the grain growth and the phase transition of an anatase TiO 2 nanopowder during SPS sintering under 1.5 and 3.5 GPa [ 48 ] using in situ synchrotron X-ray diffraction. During heating to 725 °C at a rate of 8 °C/min, X-ray diffraction patterns of the sample were collected with a rate of one pattern per minute ( Figure 18 ).…”

Section: Prospects For Technological Breakthroughsmentioning

confidence: 99%

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Recent Developments of High-Pressure Spark Plasma Sintering: An Overview of Current Applications, Challenges and Future Directions

Godec

Floch

2023

Materials

Self Cite

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Spark plasma sintering (SPS), also called pulsed electric current sintering (PECS) or field-assisted sintering technique (FAST) is a technique for sintering powder under moderate uniaxial pressure (max. 0.15 GPa) and high temperature (up to 2500 °C). It has been widely used over the last few years as it can achieve full densification of ceramic or metal powders with lower sintering temperature and shorter processing time compared to conventional processes, opening up new possibilities for nanomaterials densification. More recently, new frontiers of opportunities are emerging by coupling SPS with high pressure (up to ~10 GPa). A vast exciting field of academic research is now using high-pressure SPS (HP-SPS) in order to play with various parameters of sintering, like grain growth, structural stability and chemical reactivity, allowing the full densification of metastable or hard-to-sinter materials. This review summarizes the various benefits of HP-SPS for the sintering of many classes of advanced functional materials. It presents the latest research findings on various HP-SPS technologies with particular emphasis on their associated metrologies and their main outstanding results obtained. Finally, in the last section, this review lists some perspectives regarding the current challenges and future directions in which the HP-SPS field may have great breakthroughs in the coming years.

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Boosting KSnI3-based perovskite solar cell efficiency by 22.78% through optimized charge transport and eco-friendly buffer layer

Abdul Ghani,

Khalid,

Yan

et al. 2024

J Mater Sci

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In situ X-ray diffraction study of a TiO2 nanopowder Spark Plasma Sintering under very high pressure

Cited by 6 publications

References 43 publications

Comprehensive spectroscopy and photocatalytic activity analysis of TiO2-Pt systems under LED irradiation

Comprehensive spectroscopy and photocatalytic activity analysis of TiO2-Pt systems under LED irradiation

Recent Developments of High-Pressure Spark Plasma Sintering: An Overview of Current Applications, Challenges and Future Directions

Boosting KSnI3-based perovskite solar cell efficiency by 22.78% through optimized charge transport and eco-friendly buffer layer

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