Metal enhanced fluorescence of different metallic nanoclusters deposited on silver dendritic nanostructures

Abstract

Plasmonic nanoclusters (NCs) have been introduced as new fluorescent materials that have low toxicity and do not undergo photo‐bleaching. Several factors including size and type of the NCs, surface chemistry and even solvent affect their luminescence. Despite extensive studies on tuning the fluorescence properties of NCs by manipulation of the above‐mentioned factors, very few researches have been focused on metal enhanced fluorescence (MEF) of them. In this study, the fabrication of silver dendritic nanostructured surfaces (DNSs) with numerous hotspots and unique plasmonic properties were optimized and DNSs were used as the substrates for fluorescence enhancement of NCs. NCs made of gold, silver and copper were synthesized by different stabilizing agents and compared with each other in terms of their MEF characteristics. The results showed that the stabilizing agent, the synthesis method and type of NCs affected their fluorescence enhancement by the DNSs. Copper NCs stabilized by bovine serum albumin (BSA) had the highest rate of fluorescence enhancement, with enhancement factor of 4.8 ± 0.8. Gold NCs synthesized by glutathione (GSH) and bovine serum albumin (BSA) demonstrated 3.9 ± 0.6 and 3.1 ± 0.4 fold fluorescence enhancement, respectively. The possibility of fluorescence enhancement of NCs in the vicinity of plasmonic nano‐structures introduces attractive platforms for sensing purposes.

Photoluminescent Copper Nanoclusters in “Turn-Off/Turn-On” Sensing of Picric Acid/Hydrogen Peroxide

“…MEF occurs when a fluorophore is situated in an amplified electromagnetic field produced by far-field excitation of plasmonic metal nanoparticles and surfaces. In addition to the signal amplification, other significant spectral alterations, such as shortened lifetime, improved photo-stability, and longer distances for resonance energy transfer (RET) of fluorescence, have been documented in MEF [19]. It has also been observed that shape and surface morphology of plasmonic NPs influences optical properties.…”

Hexagonal sheet Ag and Ag nanoparticle inside 3D-TiO2 NTAs decorated Ti gauze by electrodeposition

“…Nanosilver, as a new-style functional material owned characteristic physical and chemical properties, has gained great attention, which can be used for optical material [1], antibacterial [2], biosensor [3], battery electrode [4], and catalysis [5]. With environmental problems becoming more and more serious, nanosilver for catalysis has more and more been considered, but different morphologies have a very important impact on catalysis performance.…”

Development and mechanism of a fluorescent probe for a Mn(ii) ionic complex capable of recognizing chloroform vapor molecules

“…16 More importantly, the fluorescence properties of the complexes are easily affected by environmental factors such as temperature, metal ions, and solvent molecules. [17][18][19][20][21][22] Thus, they have great potential as fluorescent probes. To date, research on the detection of harmful gases using manganese (II) complexes is still limited, and hence, the detection and identification of chloroform is almost impossible.…”