報告題目：On the exploration of the formation of colloidal semiconductor magic-size clusters
報 告 人：餘睽 教授 四川大學原子與分子物理研究所
《ACS Applied Materials and Interfaces 》執行主編
主 持 人：張立軍 教授
報告時間：2018年10月25日 10:00
報告地點：南區唐敖慶樓D區429報告廳
主辦單位：伟德bv1946
摘 要：
Colloidal semiconductor magic-size clusters (MSCs) differ significantly from conventional quantum dots (QDs) in many respects. For example, when samples are extracted from a single reaction batch, MSCs are characterized by a constant and persistent absorption peak position, while the absorption peak position of QDs redshifts due to their growth in size. Furthermore, MSCs exhibit relatively narrow optical bandwidth, compared to corresponding QDs, attributed to relatively uniform size distributions. However, little is known about the structures of the MSCs. Here, I will present our latest advances on a selective two-step approach to various single-ensemble MSCs, which are not complicated by the presence of QDs. In the first step, a pre-nucleation stage sample is obtained, which is transparent in optical absorption. In the second step, MSCs are formed from the first-step sample at relatively low temperatures, such as room temperature, either by incubation or by dispersion in a solvent. Using ZnSe as a model system, I will demonstrate that the formation of MSCs starts with the self-assembly of the cation and anion precursors. Furthermore, I will present the various MSCs obtained from our selective two-step approach, which is obviously different from the conventional hot-injection and heating up approaches. Hopefully, the presentation will facilitate mutual interest on the exploration of the structure-property relationship of MSCs.
個人介紹：
餘睽，四川大學教授，四川省創新領軍人才，美國化學學會(ACS) Applied Materials and Interfaces 執行主編。高分子物理與化學博士(McGill Univ, Canada)，博士後(McMaster Univ, Canada) 和(Sandia National Laboratories, USA)。在2014年以前，助理--副--高級研究員(National Research Council of Canada) and ISO TC229 和IEC TC113 納米技術咨詢委員會專家委員，主持或共同主持21項加拿大國家級科研項目。2014年起，全職任教四川大學原子與分子物理研究所和國家生物材料工程研究中心。研究領域主要包括：(1) 納米材料的設計、計算、制備和表征；(2) 水凝膠的設計合成；(3) 功能材料與細胞的相互作用。回四川大學後主持國家重點研發計劃《基于材料基因工程誘導的骨和軟骨修複材料研制》和國家自然科學基金2項。
