Reversible Photoswitchable Fluorescence in Thin Films of Inorganic Nanoparticle and Polyoxometalate Assemblies

Abstract

A novel type of inorganic hybridized ultrathin film consisting of Preyssler-type polyoxometalates K(14)[Na(H(2)O)P(5)W(30)O(110)] (Na-POMs) and CdSe@CdS nanoparticles (NPs) was prepared on the solid substrates by a layer-by-layer assembly technique. The film exhibits reversible fluorescence switching behavior under control of irradiation with either UV light or visible light, which is ascribed to the selective occurrence of fluorescence resonance energy transfer between luminescent NPs and different states of photochromic Na-POMs.

Near‐Infrared Plasmonic 2D Semimetals for Applications in Communication and Biology

“…[36][37][38] Here, the natural NIR LSPR of semimetal TiS 2 NSs offers great opportunities for the applications in both biological technology and optic communication as demonstrated subsequently. .…”

Preparation and visible-light photochromism of phosphomolybdic acid/polyvinylpyrrolidone hybrid film

“…Polyoxometalates(POMs) are a unique class of inorganic metal-oxide clusters and have been proved to be an attractive class of photochromic materials due to the ability of accepting one or more electrons to yield mixed-valency colored species(heteropolyblues or heteropolybrowns) [4][5][6][7][8] . Nowadays, many photochromic materials based on POM embedded into polymeric networks via non-covalent bonding were prepared, which improved the physical and chemical performance of hybrid films significantly [9][10][11][12] . Varieties of organic or inorganic polymers were used as matrix to construct hybrid films, such as polyacrylamide [13,14] , polyvinyl alcohol [15,16] and polyether chains [17,18] .…”

Proton exchange growth to mesoporous WO3·0.33H2O structure with highly photochromic sensitivity

“…It presents blue under irradiation for only 0.5 min. The results indicate that the as-synthesized WO 3 Á 0.33H 2 O exhibits highly photochromic sensitivity and fatigue resistance in solid state compared to the previous reported photochromic materials [5,14,15].…”