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Metal-Halide-Ligated Cadmium Selenide Quantum Belts by Facile Surface Exchange
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-02 00:00:00 , DOI: 10.1021/acs.chemmater.8b01294 Yuewei Yao 1 , Yang Zhou 1 , William M. Sanderson 1 , Richard A. Loomis 1 , William E. Buhro 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-02 00:00:00 , DOI: 10.1021/acs.chemmater.8b01294 Yuewei Yao 1 , Yang Zhou 1 , William M. Sanderson 1 , Richard A. Loomis 1 , William E. Buhro 1
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Amine-ligated {CdSe[n-octylamine]0.53±0.06} quantum belts undergo instantaneous, reversible exchange of the L-type amine ligation for Z-type ligation provided by the neutral metal halides MX2 (M = Cd, Zn; X = Cl, Br, I). The CdX2-ligated quantum belts are determined to have the compositions {CdSe[CdCl2]1.23}, {CdSe[CdBr2]1.03}, and {CdSe[CdI2]0.42}, corresponding to two, two, and one CdX2 monolayer shells, respectively. Exchange from L-type to Z-type MX2 ligation results in large shifts of the quantum-belt absorption (extinction) features to lower energy, which are 252, 151, and 157 meV for CdCl2, CdBr2, and CdI2 ligation, respectively. These spectral shifts, which are due to changes in the strain states of the quantum belts (QBs), and extension of the CdSe crystal lattice by surface coordination of the ligand Cd atoms, are rapidly and completely reversed by back exchange to n-octylamine ligation. Similar, reversible spectral shifts are observed upon L-type to Z-type exchange with ZnX2 ligation, although the shifts are smaller in magnitude. The results demonstrate the facility, reversibility, and generality of L-type for Z-type surface exchanges in wurtzite CdSe quantum belts, and that neutral metal halides may function as Z-type ligands in semiconductor nanocrystals.
中文翻译：
金属卤化物连接的硒化镉量子带的便捷表面交换
胺连接的{CdSe [ n-辛基胺] 0.53±0.06 }量子带经历中性金属卤化物MX 2提供的Z型连接的L型胺连接的瞬时可逆交换（M = Cd，Zn; X = Cl，Br，I）。确定连接CdX 2的量子带具有的组成{CdSe [CdCl 2 ] 1.23 }，{CdSe [CdBr 2 ] 1.03 }和{CdSe [CdI 2 ] 0.42 }，分别对应于两个，两个和一个CdX 2个单层壳。从L型到Z型MX 2的更换结扎导致量子带吸收（消光）特征向低能量方向发生较大变化，CdCl 2，CdBr 2和CdI 2的结扎分别为252、151和157 meV 。这些由于光谱带（QBs）的应变状态变化和配体Cd原子的表面配位作用引起的CdSe晶格扩展而引起的光谱偏移通过反向交换为正辛胺而迅速而完全地反转了。类似地，在与ZnX 2进行L型至Z型交换时观察到可逆的光谱偏移结扎，尽管变化幅度较小。结果证明了纤锌矿型CdSe量子带中L型用于Z型表面交换的便利性，可逆性和普遍性，并且中性金属卤化物可在半导体纳米晶体中充当Z型配体。
更新日期：2018-04-02
中文翻译：
金属卤化物连接的硒化镉量子带的便捷表面交换
胺连接的{CdSe [ n-辛基胺] 0.53±0.06 }量子带经历中性金属卤化物MX 2提供的Z型连接的L型胺连接的瞬时可逆交换（M = Cd，Zn; X = Cl，Br，I）。确定连接CdX 2的量子带具有的组成{CdSe [CdCl 2 ] 1.23 }，{CdSe [CdBr 2 ] 1.03 }和{CdSe [CdI 2 ] 0.42 }，分别对应于两个，两个和一个CdX 2个单层壳。从L型到Z型MX 2的更换结扎导致量子带吸收（消光）特征向低能量方向发生较大变化，CdCl 2，CdBr 2和CdI 2的结扎分别为252、151和157 meV 。这些由于光谱带（QBs）的应变状态变化和配体Cd原子的表面配位作用引起的CdSe晶格扩展而引起的光谱偏移通过反向交换为正辛胺而迅速而完全地反转了。类似地，在与ZnX 2进行L型至Z型交换时观察到可逆的光谱偏移结扎，尽管变化幅度较小。结果证明了纤锌矿型CdSe量子带中L型用于Z型表面交换的便利性，可逆性和普遍性，并且中性金属卤化物可在半导体纳米晶体中充当Z型配体。
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