Conducting the Temperature-Dependent Conformational Change of Macrocyclic Compounds to the Lattice Dilation of Quantum Dots for Achieving an Ultrasensitive Nanothermometer

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• 作者：Ding Zhou ; Min Lin ; Xun Liu ; Jing Li ; Zhaolai Chen ; Dong Yao ; Haizhu Sun ; Hao Zhang ; Bai Yang
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：March 26, 2013
• 年：2013
• 卷：7
• 期：3
• 页码：2273-2283
• 全文大小：753K
• 年卷期：v.7,no.3(March 26, 2013)
• ISSN：1936-086X

文摘

We report a ligand decoration strategy to enlarge the lattice dilation of quantum dots (QDs), which greatly enhances the characteristic sensitivity of a QD-based thermometer. Upon a multiple covalent linkage of macrocyclic compounds with QDs, for example, thiolated cyclodextrin (CD) and CdTe, the conformation-related torsional force of CD is conducted to the inner lattice of CdTe under altered temperature. The combination of the lattice expansion/contraction of CdTe and the stress from CD conformation change greatly enhances the shifts of both UV鈥搗is absorption and photoluminescence (PL) spectra, thus improving the temperature sensitivity. As an example, 尾-CD-decorated CdTe QDs exhibit the 0.28 nm shift of the spectra per degree centigrade (0.28 nm/掳C), 2.4-fold higher than those of monothiol-ligand-decorated QDs.

Keywords:

conformation change; cyclodextrins; lattice dilation; quantum dots; thermometer