Conductive molecularly doped gold films

Naor, Hadas; Divon, Yiftach; Iagher, Lior; Etgar, Lioz; Avnir, David

doi:10.1039/c6tc03648a

Cited by 3 publications

(3 citation statements)

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“…A glass slide is coated with poly(diallyldimethylammonium chloride) (PDDA), held by the electrostatic interactions between the positive ammonium moiety of the polymer and the silanol/silanolate (Si-OH/SiO – ) surface groups of the glass; the function of this coating is to attach the Au NPs onto the substrate through electrostatic interactions. Colloidal gold NPs (prepared by the procedure of ref , average particle size 13 nm) are deposited and self-assembled on the coated glass slide to form a sub-monolayer of aggregated Au NPs (Figure b), to be used as a catalytic layer for the electroless deposition of gold. In the next step the QD/SiO 2 NPs were deposited onto the Au NP film by spin-coating (Figure c).…”

Section: Resultsmentioning

confidence: 99%

“…The detailed procedures for the synthesis of QD/SiO 2 NPs are described in the SI. The electroless molecular doping methodology of ref was adapted and modified for the QD/SiO 2 NPs’ entrapment as follows: A catalytic layer of gold NPs was deposited on a PDDA-coated glass slide (Scheme ), rinsed with water, and dried under a nitrogen stream. A 20 μL amount of a 0.12 nmol suspension of CdSe core ( d = 3.8 nm)/CdS shell (thickness ∼15 nm) quantum dots coated with silica (thickness ∼16.5 nm) (QD/SiO 2 NPs) in methanol solution was prepared by the procedure described in ref .…”

Section: Methodsmentioning

confidence: 99%

“…In this paper we describe an approach addressing this challenge and report a metal–conductive fluorescent material, nanometric luminescent silica-coated quantum dots (QDs) embedded in a gold thin film, in a Janus-type architecture, such that part of the QD particle (the “bottom face”) is embedded in the conductive metal, while the other face remains exposed. The strategy to achieve it involved the merging of two methodologies: The first methodology is molecular/nanoparticle (NP) doping of metals. − This materials methodology was further developed here for the entrapment of the fluorescent NPs within the gold film by a self-templating process, which created a strong local encaging curvature around the QDs during a gold electroless deposition. The second methodology is protecting the QDs from direct quenching interactions by growing silica shells around the QDs, specifically, silica-coated CdSe/CdS core/shell nanoparticles (QD/SiO 2 NPs). , Combining both methodologies has led to the metal–conductive luminescent films, QD/SiO 2 @Au.…”

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Metallic Conductive Luminescent Film

Koley

et al. 2019

ACS Nano

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Metallic Conductive Luminescent Film

Koley

et al. 2019

ACS Nano

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Recent Progress in the Study of Molecularly Doped Metals

Avnir

2018

Advanced Materials

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A unique materials' methodology enables the doping of metals with functional molecules, polymers, enzymes, and nanoparticles. The resulting materials have either the combined properties of the metal and the dopants, or new, sometimes synergetic properties that are not found in the separate components, emerge. Metals that have been doped so far include gold, silver, copper, iron, gallium, palladium, platinum, and several alloys. Numerous applications have been demonstrated including catalysis, biocatalysis, bioactivity, electrochemistry (including new type of batteries), corrosion resistance, induction of chirality, tailoring unconventional properties to metals, and more. Doping of metals and adsorption on them are completely different processes, doping being a 3D event, while adsorption is a 2D process. Thus, practically all special properties and functionalities that have been demonstrated are apparent only in the doped case. Here, progress made in this field in the past four years is reviewed, including methodologies for obtaining metallic doped thin films, enhancing corrosion resistance, biomedical applications, and the use of doped metals for complex catalytic network of reactions.

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Fine-tuning of the metal work function by molecular doping

Iagher

Etgar

2018

Chem. Commun.

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A new approach for fine tuning of the metal work function (WF) in the range of 1 eV is described. WF control is achieved by 3D molecular doping of the metal rather than the classical 2D adsorption. Both small molecules (Congo red, thionine) and polymers (Nafion, poly(vinylbenzyltrimethylammonium)chloride) were shown to affect the work function of gold and silver. The in situ reaction of the dopants within the metallic matrix is a further tool for altering the WF, confirming that this effect is dopant-dependent. We attribute this effect to the charge transfer interactions between the dopant molecule and the surrounding 3D metallic cage.

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Conductive molecularly doped gold films

Abstract: Organic doping of gold films is a new alternative for adsorption, allowing the entrapmernt of a redox couple and affecting the work function.

Cited by 3 publications

References 37 publications

Metallic Conductive Luminescent Film

Metallic Conductive Luminescent Film

Recent Progress in the Study of Molecularly Doped Metals

Fine-tuning of the metal work function by molecular doping

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