Enhanced optical power limiting and visible luminescence in colloidal dispersion of ultra-small Au nanoclusters synthesized by single-pot chemical technique

Self-Assembly of Solvent-Stabilized Au Nanocluster as Efficient Förster Resonance Energy-Transfer Initiator for White Light Generation

“…7−10 Owing to the electrons' most substantial quantum confinement, the dielectric constant of such NCs gets reduced in its imaginary counterpart, and a molecule-like quantized or discrete electronic band structure appears, which eventually boosts their PL emission. 7,8 Furthermore, by tuning the size or number of atoms in an individual cluster and its stabilizing agent, the PL emission can be adjusted anywhere in the UV to NIR wavelength region. 8−10 On the other hand, AuNCs can interact with a myriad of different organic and biological moieties, which makes these ultrasmall and biofriendly AuNCs as efficient candidates to be used as donors in FRET for white light harvesting and bioimaging applications.…”

“…Sub-nanometer (nm) sized (<2 nm) AuNCs, which are nothing but the assembly of a few atoms, display a wide range of unique photophysical properties that are very different from those of their larger counterparts, i.e. , Au nanoparticles (AuNPs). − Owing to the electrons’ most substantial quantum confinement, the dielectric constant of such NCs gets reduced in its imaginary counterpart, and a molecule-like quantized or discrete electronic band structure appears, which eventually boosts their PL emission. , Furthermore, by tuning the size or number of atoms in an individual cluster and its stabilizing agent, the PL emission can be adjusted anywhere in the UV to NIR wavelength region. − On the other hand, AuNCs can interact with a myriad of different organic and biological moieties, which makes these ultrasmall and biofriendly AuNCs as efficient candidates to be used as donors in FRET for white light harvesting and bioimaging applications. The most noteworthy phenomenon exhibited by AuNCs is that they can be designed in such a way that their PL emission can be significantly enhanced through self-assembling or aggregation.…”

“…Herein, we have systematically studied the self-assembling and the corresponding AIE in PL emission of the synthesized AuNCs, which are stabilized by DMF. The AuNCs are synthesized by using a slow reduction process of HAuCl 4 by DMF at 140 °C, as we have reported elsewhere and discussed briefly in the Supporting Information. In Figure a the TEM image of the as-synthesized sample is shown, and the tiny species of size <1 nm can be observed, confirming the successful synthesis of AuNCs.…”

Electric Field Effects on Neutral Gold Clusters Au&lt;sub&gt;2-10&lt;/sub&gt;: A First-Principles Theoretical Survey of the First- and Second-Order Hyperpolarizabilities

“…Metal clusters are formed by assembling a small number of atoms ranging from a few to several hundred [1]. Among them, gold nanoparticles have received great interest in electronics [2,3], catalysis [4,5], chemical sensing [6], optical limiting [7,8], optics [9] and biomedical fields [10][11][12][13][14][15]. The field of optics investigates the interaction between matter and light resulting in specific optical properties of individual material which are essentially determined by the response of the electrons to an external electric field [16].…”

Designing Green Synthesis-Based Silver Nanoparticles for Antimicrobial Theranostics and Cancer Invasion Prevention

“…About this dipole limit, nanoparticle absorption and emission should primarily be coherent with their surface excited energy bands or active surface sites. 41,42 Metal nanoparticle luminescence is explained by a variety of mechanisms; all of these mechanisms involve the photoelectron in the surface energy states strongly absorbing light at its plasmon resonance frequency and converting a portion of that energy into heat. A wavelength similar to that of the absorbed light is emitted.…”