Energy Materials Lab, Samsung Corning Precision Materials, Asan, Korea.
Nanotechnology. 2011 Apr 22;22(16):165201. doi: 10.1088/0957-4484/22/16/165201. Epub 2011 Mar 11.
We report the novel assembly method of CdSe quantum dot (QD)/pyridine/multi-walled carbon nanotube (CdSe-py-MWNT) hybrid material between electrodes using two-step dielectrophoresis (DEP). At the first step, we assembled the individual MWNT between electrodes by the DEP method. At the second step, the CdSe-py materials were assembled onto the MWNT by DEP method again, which enables site specific and density controlled assembly of QDs. As the photoresponse results, the recovery time of the device fabricated was about 250 times faster than that of a similar CdSe-py-SWNT device using a single-walled carbon nanotube (SWNT) instead of a MWNT. Moreover, it was demonstrated that the optoelectronic property of the device could be modulated by the size of CdSe NQD assembled on a MWNT. We characterized the material and the device by using SEM, TEM, absorption spectroscopy, and optoelectronic instruments.
我们报告了一种新的 CdSe 量子点 (QD)/吡啶/多壁碳纳米管 (CdSe-py-MWNT) 杂化材料的组装方法，该方法使用两步介电泳 (DEP) 实现。在第一步中，我们通过 DEP 方法将单个 MWNT 组装在电极之间。在第二步中，通过 DEP 方法再次将 CdSe-py 材料组装到 MWNT 上，从而实现了 QD 的特定位置和密度控制组装。作为光响应结果，与使用单壁碳纳米管 (SWNT) 代替 MWNT 的类似 CdSe-py-SWNT 器件相比，该器件的恢复时间快约 250 倍。此外，还证明了通过组装在 MWNT 上的 CdSe NQD 的尺寸可以调节器件的光电性能。我们通过 SEM、TEM、吸收光谱和光电仪器对材料和器件进行了表征。
