Optical Encoding of Silver Zeolite Microcarriers

Platinum nanocrystals with a fine control of the crystal domain size in the range 1.0–2.2 nm are produced by tuning the NaOH concentration during the UV-induced reduction of H2PtCl6 in surfactant-free alkaline ethylene glycol. The colloidal solutions obtained are characterized by transmission electron microscopy and pair distribution function analysis, allowing analysis of both atomic and nanoscale structures. The obtained nanoparticles exhibit a face-centered cubic crystal structure even for the smallest nanoparticles, and the cubic unit cell parameter is significantly reduced with decreasing crystallite size. It is further demonstrated how the “UV-approach” can be used to achieve spatial control of the nucleation and growth of the platinum nanocrystals, which is not possible by thermal reduction.

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“…35 However, focusing or two-photon excitation should allow for depth control over the nanoparticle formation. 36 …”

Section: Resultsmentioning

confidence: 99%

Spatially Localized Synthesis and Structural Characterization of Platinum Nanocrystals Obtained Using UV Light

et al. 2018

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“…A detailed understanding of the involved processes is important since such small clusters, especially when confined in zeolite hosts, have interesting, but so far not well understood, catalytic potential, [22][23][24] as well as data-carrier properties via their luminescent characteristics. [9,25] In this contribution we characterize in situ the spectral evolution of the emission of silver-exchanged zeolites during heat treatment, in order to visualize possible intermediate fluorescent species. Moreover the stability of the emission under different gas atmospheres is investigated.…”

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In Situ Observation of the Emission Characteristics of Zeolite‐Hosted Silver Species During Heat Treatment

et al. 2010

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The influence of heat treatment on the evolution of luminescence in silver exchanged zeolites is investigated under controlled atmosphere by using in situ fluorescence microscopy (see figure). The results indicate that the stable yellow Ag3n+ emitter is most efficiently created in a dry zeolite Y host. In zeolite A, the clusters interact with neighboring clusters or with water, decreasing the overall yellow luminescence.

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“…Therefore, it provides a superb chemical environment for luminescent centers due to its outstanding thermal and chemical stability, such as rare earth ions456, quantum dots789101112, and noble metal Ag131415. These composite materials have potential applications in white light emitting diodes (WLEDs)16, solar cells17, optical code18, biomedicine1920 and so on. Luminescent centers may be introduced into the cages of zeolite-Y by ion exchange, vapor impregnation, solid state diffusion, or direct synthesis within the cavities or channels of zeolites21.…”

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Interaction between the exchanged Mn2+ and Yb3+ ions confined in zeolite-Y and their luminescence behaviours

Sun

Xiong

et al. 2017

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Luminescent zeolites exchanged with two distinct and interacted emissive ions are vital but less-studied for the potential applications in white light emitting diodes, solar cells, optical codes, biomedicine and so on. Typical transition metal ion Mn2+ and lanthanide ion Yb3+ are adopted as a case study via their characteristic transitions and the interaction between them. The option is considered with that the former with d-d transition has a large gap between the first excited state 4T1 and the ground state 6A1 (normally >17,000 cm−1) while the latter with f-f transition has no metastable excited state above 10,000 cm−1, which requires the vicinity of these two ions for energy transfer. The results of various characterizations, including BET measurement, photoluminescence spectroscopy, solid-state NMR, and X-ray absorption spectroscopy, etc., show that Yb3+ would preferably enter into the zeolite-Y pores and introduction of Mn2+ would cause aggregation of each other. Herein, cation-cation repulsion may play a significant role for the high valence of Mn2+ and Yb3+ when exchanging the original cations with +1 valence. Energy transfer phenomena between Mn2+ and Yb3+ occur only at elevated contents in the confined pores of zeolite. The research would benefit the design of zeolite composite opto-functional materials.

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Optical Encoding of Silver Zeolite Microcarriers

Cited by 120 publications

References 28 publications

Spatially Localized Synthesis and Structural Characterization of Platinum Nanocrystals Obtained Using UV Light

Spatially Localized Synthesis and Structural Characterization of Platinum Nanocrystals Obtained Using UV Light

In Situ Observation of the Emission Characteristics of Zeolite‐Hosted Silver Species During Heat Treatment

Interaction between the exchanged Mn2+ and Yb3+ ions confined in zeolite-Y and their luminescence behaviours

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