1448988-62-2Relevant academic research and scientific papers
Metal exchange method using Au25 nanoclusters as templates for alloy nanoclusters with atomic precision
Wang, Shuxin,Song, Yongbo,Jin, Shan,Liu, Xia,Zhang, Jun,Pei, Yong,Meng, Xiangming,Chen, Man,Li, Peng,Zhu, Manzhou
, p. 4018 - 4021 (2015)
A metal exchange method based upon atomically precise gold nanoclusters (NCs) as templates is devised to obtain alloy NCs including CuxAu25-x(SR)18, AgxAu25-x(SR)18, Cd1Au24(SR)18, and Hg1Au24(SR)18 via reaction of the template with metal thiolate complexes of CuII, AgI, CdII, and HgII (as opposed to common salt precursors such as CuCl2, AgNO3, etc.). Experimental results imply that the exchange between gold atoms in NCs and those of the second metal in the thiolated complex does not necessarily follow the order of metal activity (i.e., galvanic sequence). In addition, the crystal structure of the exchange product (Cd1Au24(SR)18) is successfully determined, indicating that the Cd is in the center of the 13-atom icosahedral core. This metal exchange method is expected to become a versatile new approach for synthesizing alloy NCs that contain both high- and low-activity metal atoms.
Near Infrared Electrochemiluminescence of Rod-Shape 25-Atom AuAg Nanoclusters That Is Hundreds-Fold Stronger Than That of Ru(bpy)3 Standard
Chen, Shuang,Ma, Hedi,Padelford, Jonathan W.,Qinchen, Wanli,Yu, Wei,Wang, Shuxin,Zhu, Manzhou,Wang, Gangli
, p. 9603 - 9609 (2019)
Near infrared (near-IR) electrogenerated chemiluminescence (ECL) from rod-shape bimetallic Au12Ag13 nanoclusters is reported. With ECL standard tris(bipyridine)ruthenium(II) complex (Ru(bpy)3) as reference, the self-annihilation ECL of the Au12Ag13 nanoclusters is about 10 times higher. The coreactant ECL of Au12Ag13 is about 400 times stronger than that of Ru(bpy)3 with 1 mM tripropylamine as coreactants. Voltammetric analysis reveals both oxidative and reductive ECLs under scanning electrode potentials. Transient ECL signals (tens of milliseconds) and decay profiles are captured by potential step experiments. An extremely strong and transient self-annihilation ECL is detected by activating LUMO and HOMO states sequentially via electrode reactions. The ECL generation pathways and mechanism are proposed based on the key anodic and cathodic activities arising from the energetics of this unique atomic-precision bimetallic nanocluster. Successes in the generation of the unprecedented strong near-IR ECL strongly support our prediction and choice of this nanocluster based on its record-high 40% quantum efficiency of near-IR photoluminescence. Correlation of the properties to the atomic/electronic structures has been a long-pursued goal particularly in the fast growing atomic-precision nanoclusters field. The mechanistic insights provided in this fundamental study could guide the design and syntheses of other nanoclusters or materials in general to achieve improved properties and further affirm the structure-function correlations. The high ECL signal in the less interfered near-infrared spectrum window offers combined merits of high-signal-low-noise/interference or high contrast for broad analytical sensing and immunoassays and other relevant applications.
A 200-fold quantum yield boost in the photoluminescence of silver-doped AgxAu25-x nanoclusters: The 13 th silver atom matters
Wang, Shuxin,Meng, Xiangming,Das, Anindita,Li, Tao,Song, Yongbo,Cao, Tiantian,Zhu, Xiuyi,Zhu, Manzhou,Jin, Rongchao
, p. 2376 - 2380 (2014)
The rod-shaped Au25 nanocluster possesses a low photoluminescence quantum yield (QY=0.1 %) and hence is not of practical use in bioimaging and related applications. Herein, we show that substituting silver atoms for gold in the 25-atom matrix can drastically enhance the photoluminescence. The obtained AgxAu25-x (x=1-13) nanoclusters exhibit high quantum yield (QY=40.1 %), which is in striking contrast with the normally weakly luminescent AgxAu25-x species (x=1-12, QY=0.21 %). X-ray crystallography further determines the substitution sites of Ag atoms in the AgxAu25-x cluster through partial occupancy analysis, which provides further insight into the mechanism of photoluminescence enhancement. Shine on, you crazy cluster: Highly fluorescent, silver-doped AgxAu25-x nanoclusters (II; x=1-13; QY=40.1 %) have been successfully synthesized through the reaction of a silver thiolate complex with Au11 clusters. In contrast, species with x=1-12 (I) and undoped Au25 nanoclusters are only weakly fluorescent (QY=0.21 % and 0.1 %, respectively). Copyright
A new silver cluster that emits bright-blue phosphorescence
Yang, Jin-Sen,Zhang, Miao-Miao,Han, Zhen,Li, Hai-Yang,Li, Lin-Ke,Dong, Xi-Yan,Zang, Shuang-Quan,Mak, Thomas C. W.
, p. 2451 - 2454 (2020)
A new hexanuclear silver(i) cluster (NC-Ag6) that emits bright-blue phosphoresce with a lifetime of 22.4 μs and a quantum yield (QY) of 22% under ambient conditions was synthesized. A film combining NC-Ag6 with yellow cerium(iii)-doped yttrium aluminum garnet phosphors (YAG:Ce3+) displays chameleon -like emission (including white), which is related to excitation-dependent F?rster resonance energy transfer (FRET) between dual phosphors. The mechanoresponsive luminescence colour of this silver cluster ranges from blue to green virtually without loss of QY.
