Thermally formation and luminescent performance of silver nanoclusters confined within LTA zeolites

Luminescence Control of Silver Nanoclusters by Tailoring Extra-Framework Cations in FAU-Y Zeolite: Implications for Tunable Emission

“…The variations in diffraction peak position and lattice parameters can be attributed to the differences in ionic radius and valence state among Li + , Na + , and Ca 2+ , indicative of the successful modification on the extra-framework cations of NaY. Besides, the diffraction peak intensity ( I ) of (220, 311, and 331) facets for 2LiY and 2CaY shows the trend I 331 > I 311 > I 220 , varying from I 331 > I 220 > I 311 for the parent NaY zeolite, which can be ascribed to the redistribution of charge-balancing cations inside the zeolites after ion exchange. ,, After subsequent Ag + exchange on 2LiY, NaY, and 2CaY, although the resultant 2LiY20Ag, NaY20Ag, and 2CaY20Ag all exhibit increased lattice parameters due to the larger ionic radius of Ag + , as shown in Figure b, the lattice parameter variation tendency resulted from the initial Li + and Ca 2+ exchange is still maintained.…”

“…The nanoclusters consisting of only a few atoms or ions possess a discrete molecule-like energy band and thus show size-dependent luminescence performance. In the recent years, Ag NCs with different sizes, topologies, and chemical states have attracted much research interest due to their pronounced optical properties like high quantum yield approaching that of commercial phosphors and tunable emission in the visible region, which open up new vistas in potential photocatalytic, imaging, detection, and illumination applications. − However, Ag NCs undergo aggregation easily due to their high surface energy and thus lose their radiative emission ability. ,, In order to spatially and chemically stabilize Ag NCs and obtain the desired optical properties, two types of scaffolds were generally applied during the synthesis process: (1) soft organic molecules like DNA, peptides, and polymers, and (2) a rigid inorganic matrix including glasses and zeolites, whereby the few-atom size clusters can be stabilized by immobility. − …”

Confinement of Highly Luminescent Silver Nanoclusters in FAUY Zeolite: A Study on the Formation Effects of Silver Nanoclusters and the Sensitization of Tb3+

“…It indicated that the growth rate of silver species follows a noncooperative Hill–Langmuir type behavior and is different in FAU zeolites, depending on the mobility of Ag + in the framework . In addition, some controllable conditions like the silver loading degree, thermal treatment temperature, counterbalancing cations, hydration state, and formaldehyde adsorption also greatly influence the luminescence performance of Ag NCs, ,,,,, which thus make the precise synthesis as well as the light emitting, sensing, and detecting applications of Ag NCs possible in zeolites. For example, studies about the effect of counterbalancing cations (such as Na + , Li + , K + , and Cs + ) on the luminescence properties of Ag NCs inside zeolites indicated that Ag NCs exhibited shifted emission wavelength in the presence of different co-cations and showed high emission intensity in the Li + -exchanged zeolites.…”

Facile activation of lithium slag for the hydrothermal synthesis of zeolite A with commercial quality and high removal efficiency for the isotope of radioactive 90Sr

“…Previous studies show that the crystallization temperature for zeolite A varies from ambient temperature to over 100 °C, depending on the recipe. 45,46 The optimized crystallization temperature in this study was 75 °C. Thus, we varied the crystallization temperature to 60, 95, 100, 120 and 140 °C (nos 29-33 in Table 1) and the XRD patterns of the corresponding products are provided in Fig.…”