Shi Chao, Zhang Yi, Gu Claire, Seballos Leo, Zhang Jin Z
Department of Electrical Engineering, University of California at Santa Cruz, Santa Cruz, CA 95064, USA.
Nanotechnology. 2008 May 28;19(21):215304. doi: 10.1088/0957-4484/19/21/215304. Epub 2008 Apr 21.
A simple experimental method has been demonstrated for manipulating multi-walled carbon nanotube (MWCNT) bundles through the optical trapping of attached silver nanoparticles (SNPs). In our experiments, without the SNPs, the MWCNTs cannot be trapped due to their irregular shapes and large aspect ratio. However, when mixed with SNPs, the MWCNTs can be successfully trapped along with the SNPs using a TEM(00) mode laser at 532 nm. This is attributed to the optical trapping of the SNPs and attractive interaction or binding between the SNPs and MWCNTs due to electrostatic and van der Waals forces. Therefore, optical manipulation of MWCNT bundles is achieved through the manipulation of the attached silver nanoparticles/aggregates. In addition, we have observed the phenomenon of light-induced further agglomeration of SNPs/MWCNTs which could potentially be exploited for fabricating patterned MWCNT films for future nanoscale devices and other applications.
一种简单的实验方法已得到证实，可通过对附着的银纳米颗粒（SNP）进行光镊操作来操控多壁碳纳米管（MWCNT）束。在我们的实验中，没有SNP时，由于MWCNT形状不规则且长径比大，无法被捕获。然而，当与SNP混合时，使用532 nm的TEM(00)模式激光可成功将MWCNT与SNP一起捕获。这归因于SNP的光镊作用以及由于静电和范德华力导致的SNP与MWCNT之间的吸引相互作用或结合。因此，通过对附着的银纳米颗粒/聚集体的操控实现了对MWCNT束的光学操控。此外，我们还观察到了光诱导SNP/MWCNT进一步团聚的现象，这有可能用于制造用于未来纳米级器件及其他应用的图案化MWCNT薄膜。
