Size Reduction of CdSe/ZnS Quantum Dots by a Peptidic Amyloid Supergelator
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- 作者：Md. Badruz Zaman ; David Bardelang ; Micha毛l Prakesch ; Donald M. Leek ; Jean-Val猫re Naubron ; Gordon Chan ; Xiaohua Wu ; John A. Ripmeester ; Christopher I. Ratcliffe ; Kui Yu
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：March 28, 2012
- 年：2012
- 卷：4
- 期：3
- 页码：1178-1181
- 全文大小：279K
- 年卷期：v.4,no.3(March 28, 2012)
- ISSN：1944-8252
文摘
Anchoring of a self-assembling dipeptide on the surface of core/shell CdSe/ZnS quantum dots resulted in a competition between coordination of the surface atoms of the QDs and the strong tendency for the dipeptide to self-assemble in toluene. This resulted in a mild QD etching and in a corresponding increase in the band gap of the nanocrystals whose photoluminescent emission gradually turns blue with time. The FmocLeuLeuOH dipeptide supergelator self-assembles in fibrils in which the Fmoc groups are surrounded by the pendant isobutyl side chains of the leucine residues with vibrational circular dichroism (VCD) and liquid- and solid-state NMR attributes of twist anti-parallel 尾-sheets.