Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan.
J Colloid Interface Sci. 2011 Jun 15;358(2):323-8. doi: 10.1016/j.jcis.2011.03.002. Epub 2011 Mar 8.
We study the effects of bifunctional linker on the optical properties of ZnO nanocolumn-linker-CdSe quantum dots heterostructure. The CdSe quantum dots are anchored on the surface of ZnO nanocolumns through either aliphatic linker of 3-aminopropyl trimethoxysilane (APS) or aromatic linker of p-aminophenyl trimethoxysilane (APhS). X-ray photoelectron spectroscopy is used to confirm the bifunctional linker bound onto CdSe quantum dots and onto the ZnO nanocolumns. The TEM study reveals a CdSe quantum dot shell of about 15 nm coated on the ZnO nanocolumns. The photoluminance (PL) spectroscopy and time-resolved PL spectroscopy of ZnO nanocolumn-linker-CdSe quantum dots reflects that the photo-induced electron transfer across the interface of ZnO and CdSe through the aromatic APhS is more efficient than the aliphatic APS. This study demonstrates that through the usage of appropriate surface linker, the charge transfer rate across the interfaces of donor/acceptor (D/A) heterostructure can be improved for potential photovoltaic cell applications.
我们研究了双功能连接子对 ZnO 纳米柱-连接子-CdSe 量子点异质结光学性质的影响。CdSe 量子点通过脂肪族连接子 3-氨丙基三甲氧基硅烷（APS）或芳香族连接子对氨基苯三甲氧基硅烷（APhS）锚定在 ZnO 纳米柱表面。X 射线光电子能谱用于确认双功能连接子结合到 CdSe 量子点和 ZnO 纳米柱上。TEM 研究表明，CdSe 量子点壳约为 15nm 覆盖在 ZnO 纳米柱上。ZnO 纳米柱-连接子-CdSe 量子点的光致发光（PL）光谱和时间分辨 PL 光谱表明，通过芳香族 APhS 在 ZnO 和 CdSe 界面上的光诱导电子转移比脂肪族 APS 更有效。这项研究表明，通过使用适当的表面连接子，可以提高供体/受体（D/A）异质结界面的电荷转移速率，从而为潜在的光伏电池应用提供帮助。
