Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea.
ACS Nano. 2010 Jan 26;4(1):324-30. doi: 10.1021/nn9009938.
Nanocrystal quantum dot (NQD)/single-walled carbon nanotube (SWNT) hybrid nanomaterials were synthesized, assembled into field effect transistors (FETs) via dielectrophoresis (DEP), and characterized optically and electronically. The pyridine moiety functioned as a short, noncovalent linker between the NQDs and SWNTs and allowed more efficient carrier transfer through the assemblies without deleteriously altering electronic structures. Photoluminescence studies of the resulting assemblies support an efficient carrier transfer process in CdSe-py-SWNTs unlike that of CdSe/ZnS-py-SWNTs. The use of DEP as a means of controlling the assembly process allowed the creation of a SWNT array containing densely packed CdSe NQDs across a 2 mum gap between electrodes. Observations and characterization of the photocurrent, resistivity, gate dependence, and optical properties of these systems suggest efficient electron transfer from photoexcited NQDs to SWNTs.
纳米晶量子点 (NQD)/单壁碳纳米管 (SWNT) 杂化纳米材料被合成，并通过电介质电泳 (DEP) 组装成场效应晶体管 (FET)，然后进行光学和电子特性表征。吡啶部分在 NQDs 和 SWNTs 之间充当短的非共价连接体，允许通过组装体更有效地进行载流子转移，而不会对电子结构产生有害影响。所得组装体的光致发光研究支持 CdSe-py-SWNTs 中有效的载流子转移过程，而不同于 CdSe/ZnS-py-SWNTs。DEP 的使用作为控制组装过程的一种手段，允许在电极之间 2 微米的间隙中形成含有密集排列的 CdSe NQD 的 SWNT 阵列。对这些系统的光电流、电阻率、栅极依赖性和光学特性的观察和表征表明，从光激发的 NQD 到 SWNT 的电子转移是有效的。
