Assemblies from metallic and semiconducting nanocrystals

Kahle, Ingolf; Krause, Stefan; Krasselt, Cornelius; Jakob, Alexander; Oehlke, Alexander; Georgi, Colin; Schulze, Steffen; Lang, Heinrich; Hietschold, Michael; Spange, Stefan; Borczyskowski, C. von

doi:10.1007/s00339-013-8027-2

Cited by 2 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No photoactivation was necessary as observed in previous work, for example, for clusters originating from AgO films. , Indeed, the observed nanoclusters showed the opposite trend in terms of decreasing fluorescence intensity for long time irradiation due to photobleaching on time scales of several hundred seconds . As already reported ,, all of the Ag emitters show fluorescence intermittency (blinking) also known from other single quantum objects such as quantum dots or molecules . Here this is not in the focus of our interest but supports the conclusion that we are dealing with single clusters.…”

Section: Resultssupporting

confidence: 88%

Optical Tracking of Single Ag Clusters in Nanostructured Water Films

et al. 2013

Self Cite

View full text Add to dashboard Cite

The spatial diffusion and size distribution of monodisperse silver nanoclusters synthesized via Ag(I) carboxylate in zeolite Y cages are investigated in nanostructured water films on silicon dioxide (SiO 2 ) and mica surfaces with optical and atomic force techniques. Subnanometer clusters escaping the zeolite Y cage show a strong and photostable fluorescence emission in the visible range and allow for optical singlecluster tracking. Heterogeneous diffusion dynamics reflect the transition from an ice-like to a liquid-like water film as a function of film thickness. The contributions of the different diffusion coefficients strongly correlate with the water film thickness and the chemical composition of the interface. The heterogeneity of the diffusion is caused by ad-and desorption of Ag clusters to silanol groups at the SiO 2 interface which couple vibronically to the Ag clusters as can be seen from single cluster fluorescence spectra.

show abstract

Section: Resultssupporting

confidence: 88%

Optical Tracking of Single Ag Clusters in Nanostructured Water Films

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ag nanoparticles investigated in this presentation have been prepared in the group of Prof. S. Spange, TU Chemnitz. SEM and TEM measurements on Ag particles in zeolites have been reported recently by us (Kahle et al 2014). However, after dilution and extraction of single Ag clusters, these clusters could not be immobilized on surfaces for investigations with SEM and TEM.…”

Section: Materials and Synthesismentioning

confidence: 94%

“…We have reported recently that about 50 % of single Ag particles are subject to spatial diffusion as can be easily detected at a wide-field frame rate of 200 ms (Krause et al 2013;Kahle et al 2014). We have shown that the diffusion occurs in an ultrathin water film, the thickness of which can be controlled by regulating the humidity in an appropriate chamber.…”

Section: Diffusionmentioning

confidence: 94%

Optical investigation of diffusion of single Ag markers in confined water films

et al. 2014

Self Cite

View full text Add to dashboard Cite

Silver (Ag) clusters with sub-nanometer diameter show as a kind of marker fluorescence emission in the visible range and allow besides optical singlecluster tracking for spectroscopy of single clusters revealing a vibronic coupling of the Ag clusters to the interface. Fluorescence intensity intermittence (blinking) and laser power-dependent photobleaching are observed. The spatial diffusion of monodisperse silver nanoclusters explores ultrathin nanostructured water films on silicon dioxide (SiO 2 ). These heterogeneous diffusion dynamics depend strongly on the thickness of wetting with ultrathin water films and the chemical composition of the SiO 2 interface. Thickness-dependent structural changes of the water film have significant influence on diffusion dynamics. We present a numerical model which explains the heterogeneous diffusion across the layers of water with varying viscosity. Our results do not only demonstrate the feasibility to use Ag nano markers to explore nanostructures but also reveal the complexity of nanostructured liquids at solid interfaces.

show abstract

Assemblies from metallic and semiconducting nanocrystals

Cited by 2 publications

References 48 publications

Optical Tracking of Single Ag Clusters in Nanostructured Water Films

Optical Tracking of Single Ag Clusters in Nanostructured Water Films

Optical investigation of diffusion of single Ag markers in confined water films

Contact Info

Product

Resources

About