期刊
ACS NANO
卷 7, 期 3, 页码 2273-2283出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn305423p
关键词
conformation change; cyclodextrins; lattice dilation; quantum dots; thermometer
类别
资金
- 973 Program of China [2012CB933802, 2009CB939701]
- NSFC [21174051, 91123031, 21221063]
- MOST of China
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 (die, 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-vis absorption and photoluminescence (PL) spectra, thus improving the temperature sensitivity. As an example, beta-CD-decorated CdTe QDs exhibit the 0.28 nm shift of the spectra per degree centigrade (0.28 nm/degrees C), 2.4-fold higher than those of monothiol-ligand-decorated QDs.
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