{Reference Type}: Journal Article {Title}: CdS magic-size clusters exhibiting one sharp ultraviolet absorption singlet peaking at 361 nm {Author}: Tang, Junbin; Hui, Juan; Zhang, Meng; Fan, Hongsong; Rowell, Nelson; Huang, Wen; Jiang, Yingnan; Chen, Xiaoqin; Kui, Yu {Journal}: Nano Research {ISBN/ISSN}: 1998-0124 {Year}: 2019 {Volume}: 12 {Issue}: 6 {Pages}: 1437-1444 {DOI}: 10.1007/s12274-019-2386-8 {Keywords}: colloidal semiconductor CdS {Keywords}: magic-size clusters (MSCs) {Keywords}: MSC-361 {Keywords}: quantum dots (QDs) {Keywords}: electronic structures {Abstract}: We report, for the first time, the synthesis of CdS magic-size clusters (MSCs) which exhibit a single sharp absorption peaking at ~ 361 nm, along with sharp band edge photoemission at ~ 377 nm and broad trap emission peaking at ~ 490 nm. These MSCs are produced in a single-ensemble form without the contamination of conventional quantum dots (QDs) and/or other-bandgap clusters. They are denoted as MSC-361. We present the details of several controlled syntheses done in oleylamine (OLA), using Cd(NO3)2 or Cd(OAc)2 as a Cd source and thioacetamide (TAA) or elementary sulfur (S) as a S source. A high synthetic reproducibility of the reaction of Cd(NO3)2 and TAA to single-ensemble MSC-361 is achieved, the product of which is not contaminated by other bandgap clusters and/or QDs. In some cases, the reaction product exhibits an additional absorption peak at ~ 322 nm. We demonstrate that the two peaks, at 361 and 322 nm, do not evolve synchronously. Therefore, the 322 nm peak is not a higher order electronic transition of MSC-361, but due to the presence of another ensemble, namely MSC-322. The present study suggests that there is an outstanding need for the development of a physical model to narrow the knowledge gap regarding the electronic structure in these colloidal semiconductor CdS MSCs. {URL}: https://www.sciopen.com/article/10.1007/s12274-019-2386-8 {Language}: en