Facile one-pot synthesis of near-infrared luminescent gold nanoparticles for sensing copper (II)

Abstract

Novel near-infrared luminescent gold nanoparticles (NIRL-AuNPs) were synthesized by a simple, rapid and one-pot procedure. The driving force for the formation of these NIRL-AuNPs was attributed to the heat-assisted reduction of a gold(I)-thiol complex. These gold nanoparticles were characterized by TEM, DLS, FT-IR and XPS. Luminescence studies indicated that these NIRL-AuNPs exhibited strong emission with peak maximum at 810 nm, microsecond-range photoluminescence lifetime, large Stokes shifts (>400 nm) and stabilities towards photobleaching and chemical oxidation. The sensing application for Cu(2+) ions of these NIRL-AuNPs was demonstrated. These as-synthesized gold nanoparticles will provide a new NIRL nanomaterial for in vitro and in vivo applications.

Microwave-assisted synthesis of photoluminescent glutathione-capped Au/Ag nanoclusters: A unique sensor-on-a-nanoparticle for metal ions, anions, and small molecules

“…The Cu 2+ ion is known to be an efficient quencher for various fluorophores, including GS-Au NCs [52]. Moreover, sulfide, iodide, and cysteine have been reported to quench the luminescence of Au or Ag clusters through their strong interaction with the metal surface [30,50,51].…”

Synthesis of DNA-templated fluorescent gold nanoclusters

“…Fluorescent Au NCs have been prepared mainly in a bottom-up manner by the reduction of gold precursors in the presence of various templates such as macromolecules (dendrimers [5][6][7][8][9], proteins [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], poly-butadiene [25]), small molecules (histidine [26], carbohydrate [27], thiols [28][29][30][31][32][33], N, N-dimethylformamide [34,35], penicillamine [36]), and even solid functional organisms (eggshell membrane [37]). Alternatively, top-down etching of preformed large nanoparticles down to desired NC sizes has received much attention due to many available synthetic strategies for the large nanoparticles.…”

“…In addition, the optical properties of the Au NCs are related to the ligands that protect them from aggregations [51] and redox state of the gold core [52,53], or the gold core geometry tuned by the oxidation states [53]. On the basis of this mechanism understanding, many applications, for example, detections of Hg 2+ [12-15, 37, 47], Cu 2+ [19,20,32] [18], glucose [24], and dopamine [21], and cell labeling or imaging [13,23,40,48], have been achieved with Au NCs as reporters by direct or indirect reaction of the NCs' protecting ligands or gold cores with the species of interest. However, in comparison to the fruitful strategies for the DNA-templated synthesis and optical tunability of silver nanoclusters (Ag NCs) [54,55], there are fewer reports for the successful synthesis of Au NCs with DNA as template.…”

Synthesis and optical properties of σ–π conjugated aluminum-containing polyphenylcarbosilane (Al-PPCS) by hydrosilylation polymerization

“…Then, the powder cell, filled with a sample, was placed in the solid sample holder as the surface of the quartz glass window was specially set at 45 angles to the incident and the reflected light paths [37][38][39]. Absolute PL quantum yields were measured using a fluorescence spectrophotometer (FluoroMax-4, Horiba Jobin Yvon, France) with a quantum yield accessory (model F-3018) including a 4 00 (10 cm) integrating sphere and solid sample holder [40][41][42][43]. Gel permeation chromatography (GPC) measurements were performed at 35 C with THF as the eluant (1.0 mL/min) using an Agilent 1100 system (Agilent, Santa Clara, USA).…”