Polyhedral Oligomeric Silsesquioxane as a Ligand for CdSe Quantum Dots

详细信息    查看全文

• 作者：Yu Wang ; Aleksandar Vaneski ; Haihua Yang ; Shuchi Gupta ; Frederik Hetsch ; Stephen V. Kershaw ; Wey Yang Teoh ; Huanrong Li ; Andrey L. Rogach
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：January 31, 2013
• 年：2013
• 卷：117
• 期：4
• 页码：1857-1862
• 全文大小：414K
• 年卷期：v.117,no.4(January 31, 2013)
• ISSN：1932-7455

文摘

We report the synthesis of CdSe quantum dots (QDs) using a mercapto-substituted polyhedral oligomeric silsesquioxane (SH-POSS). The bulky siloxane cage-like core of the ligand makes this an ideal steric stabilizer, and comparison with conventional branched alkyl phosphonic acid capped CdSe QDs shows SH-POSS capped QDs to have superior optical properties including photoluminescence quantum efficiencies and fluorescence lifetimes. The POSS shell allows for the access of small electrolyte ions and electron transport from the surface of the QDs, evidenced by better performance as a photosensitizer in conjunction with a titania nanotube array electron acceptor in comparison to the conventionally stabilized QDs.