Metallic Conductive Luminescent Film

Abstract

We report a solution for the challenge of having luminescence and metal conductivity from the same material. The fabrication of a hybrid metal–conductive luminescent film that manifests this dual property is described: the conductivity arising from a continuous gold thin film structure and luminescence originating from the embedded fluorescent emitters (nanoparticles of silica-coated CdSe/CdS quantum dots (QD/SiO2 NPs)). The embedding of the QD/SiO2 NPs is performed via a self-templating gold electroless process. The presence of the insulating silica layer on the QDs avoids quenching and enables luminescence, while still allowing plasmonic coupling of the QDs, as observed by luminescence lifetime analysis and by surface-enhanced Raman scattering. The potential applications of this special dual functionality are demonstrated by its used as a temperature probe: Passing current (heating the gold thin film) affects the emission intensity and induces a spectral red-shift of the QD/SiO2 NPs. All properties of this metal–conductive luminescent film required the special embedding architecture and are not observed with simple adsorption of QD/SiO2 NPs on a continuous Au film.

Silica-Based Aerogels with Tunable Properties: The Highly Efficient BF3-Catalyzed Preparation and Look inside Their Structure

“…The choice of this inorganic compound as a filler was not accidental: we need such an aerogel for further NMR studies (see Section and Supp.Inf.2). Moreover, such Cr-siloxane aerogels can be used as an example of promising heterogeneous M@SiO 2 -catalysts with a relatively high specific surface area. − …”

Pseudo-tricolor typed nanobelts and arrays simultaneously endowed with conductive anisotropy, magnetism and white fluorescence

“…The prepared material simultaneously possesses magnetism and visible near-infrared luminescence. He et al 26 prepared a composite film with both conductive and fluorescence performances as a temperature probe. Polyaniline (PANI) is a widely studied conductive polymer and has been widely used in flexible electronics, solar cells, electromagnetic shielding and supercapacitors owing to its excellent conductivity and easy synthesis.…”

Metal nanoparticles entrapped in metal matrices

“…It is quite general and a wide variety of dopants -dyes, antibacterial agents and drugs, enzymes, polymers, chiral molecules, and catalytic complexes, have been entrapped in various metals, including Ag, Pt, Pd, Cu, Fe, Co, Au, and various alloys 7,8 . Recently, this methodology was extended to the entrapment of non-metallic NPs as dopants: ceria-NPs@Pd 9 , magnetic strontium hexaferrite-NPs@coin metals 10 and CdSe/CdS core-SiO 2 shell entrapped in thin films of Au 11 . The main methods for 3 obtaining these dopant@M materials are based on the reduction of the metal cation of the entrapping metal in the presence of the dopant to be entrapped, and specific reduction processes include using homogeneous reducing agents, heterogeneous reducing agents, using the solvent for the reduction, electrochemical reduction and more 8 .…”

“… 7,8 Recently, this methodology was extended to the entrapment of non-metallic NPs as dopants: ceria-NPs@Pd, 9 magnetic strontium hexaferrite-NPs@coin metals 10 and CdSe/CdS core-SiO 2 shell entrapped in thin films of Au. 11 The main methods for obtaining these dopant@M materials are based on the reduction of the metal cation of the entrapping metal in the presence of the dopant to be entrapped, and specific reduction processes include using homogeneous reducing agents, heterogeneous reducing agents, using the solvent for the reduction, electrochemical reduction and more. 8 As in the case of molecules, a NP-dopant is held tightly inside the cages of the aggregated porous matrix, but on the other hand, is accessible to react with external reagents.…”