Understanding nascent plasmons and metallic bonding in atomically precise gold nanoclusters

Abstract

The metallic bond is arguably the most intriguing one among the three types of chemical bonds, and the resultant plasmon excitation (e.g. in gold nanoparticles) has garnered wide interest. Recent...

Tailoring the Electron–Phonon Interaction in Au25(SR)18 Nanoclusters via Ligand Engineering and Insight into Luminescence

“…As shown in Figure A–D, the absorption profiles of the thin-film spectra are consistent with their solution counterparts, despite a slight broadening and trivial shift. Such broadening and shift is commonly observed and can be ascribed to a stronger coupling between electronic states and vibrational states in the solid state. , Hence, the thin films are of good quality and can be employed to understand the electronic and optical properties of Au 25 NCs.…”

Coherent vibrational dynamics of Au144(SR)60 nanoclusters

“…There are several broad absorption peaks at around 337, 463, 517 and 700 nm, which agrees with previous reports. 50,54,55 From the continuous absorption bands in Au 144 PET 60 , it is difficult to extract the energy gap. Koivisto et al 56 collected the optical spectra of an Au 144 PET 60 thin lm in IR and NIR regimes, and combined with linear response time-dependent DFT (TD-DFT) calculations, the optical gap of Au 144 PET 60 was determined to be 0.19 eV.…”

“…† One could nd that the electronic dynamics measured at 295 K is slightly faster than that measured at 77 K. This suggests that the heat transfer/ dissipation are not the dominant factors during the excitedstate relaxation. The blue-shi of the GSB signal is attributed to the increase of the HOMO-LUMO gap as the temperature decreases, 57 which was also observed in Au 35 , Au 38 , etc., 51,54,59,60 with these phenomena oen explained as the interaction between the Au core and phonons at the staple. 51,59 The detailed TA spectra and tting results are shown in Fig.…”

“…The blue-shift of the GSB signal is attributed to the increase of the HOMO–LUMO gap as the temperature decreases, 57 which was also observed in Au 35 , Au 38 , etc. , 51,54,59,60 with these phenomena often explained as the interaction between the Au core and phonons at the staple. 51,59 The detailed TA spectra and fitting results are shown in Fig.…”

“…Deng et al 53 found that the origin of the structural stability of Au 144 (SR) 60 and Au 144 (C CR) 60 is due to the thermodynamic stability by applying DFT energy calculation and energy decomposition analysis (EDA); in addition, they also suggested that the Au 144 NCs are unique in size because the larger (Au 279 ) and smaller (Au 130 , Au 133 ) gold NCs both prefer the center-filled gold polyhedrons. Recent work by Du et al 54 reported temperature-dependent (room temperature to 2.5 K) absorption spectra, in which they observed several new features at cryogenic temperatures, which provides strong evidence of discrete energy levels within Au 144 PET 60 (where, PET = SCH 2 CH 2 Ph).…”