Luminescence properties of Nd3+, Sm3+ and Eu3+ intercalated CdPS3

Nd3+, Sm3+ and Eu3+ have been intercalated by cation exchange into CdPS3. The photoluminescence and IR spectra show the creation of cadmium cation vacancies. Crystal field analysis indicates that the rare earths have entered the intralamellar vacancies and formed a complex defect center with C2 or lower symmetry.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/31679/1/0000615.pd

Organophosphonate bridged anatase mesocrystals: low temperature crystallization, thermal growth and hydrogen photo-evolution

The sol-gel co-condensation of organo-phosphonates to titanium alkoxides enables access to novel organic-inorganic hybrids based on phosphonate-bridged titanium dioxide. In this contribution, we bring new perspectives to the long established sol-gel mineralization of titanium alkoxide species, by harnessing the virtues of the well-designed phosphonate-terminated phosphorus dendrimers as reactive amphiphilic nanoreactor, confined medium and cross-linked template to generate discrete crystalline anatase nanoparticles at low temperature (T = 60 degrees C). An accurate investigation on several parameters (dendrimer generation, dendrimer-to-titanium alkoxide ratio, precursor reactivity, temperature, solvent nature, salt effect) allows a correlation between the network condensation, the opening porous framework and the crystalline phase formation. The evolution of the dendrimer skeleton upon heat treatment has been deeply monitored by means of P-31 NMR, XPS and Raman spectroscopy. Increasing the heteroatom content within a titania network provides the driving force for enhancing their photocatalytic water splitting ability for hydrogen production.Brahmi, Y.; Katir, N.; Macia Agullo, JA.; Primo Arnau, AM.; Bousmina, M.; Majoral, J.; García Gómez, H.... (2015). Organophosphonate bridged anatase mesocrystals: low temperature crystallization, thermal growth and hydrogen photo-evolution. Dalton Transactions. 44(35):15544-15556. doi:10.1039/c5dt02367jS1554415556443

Nouveaux colloiedes photosensibles a base d'oxyde de titane TiO2

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Synthesis and luminescence properties of CdPS3 intercalated with rare earth cations

Nd3+, Sm3+ and Eu3+ have been intercalated by a cation exchange procedure into the layered lattice of CdPS3. X-ray diffraction measurements of the interlamellar expansion demonstrate that the cations initially occupy the interlamellar planes and are solvated by a water bilayer. Dehydration of the lattice occurs at 120[deg]C and is accompanied by a substantial decrease in the interlamellar spacing. Analysis of the host lattice photoluminescence and i.r. spectra indicate cadmium cation vacancies are created in the host lattice to balance the intercalated charge. The crystal field effects on the rare earth cation photoluminescence indicate that the cations have entered the intralamellar cation vacancies to form a complex defect center with C2 or lower symmetry. It is proposed that replacing dipositive Cd2+cations with RE3+ cations creates a characteristic complex involving two RE3+ cations and a lattice vacancy, V2-.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/31848/1/0000797.pd