Concomitant length and diameter separation of single-walled carbon nanotubes
Concomitant length and diameter separation of single-walled carbon nanotubes
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DOI：
10.1021/ja046450z
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发表时间：
2004-11-10
影响因子：
15
通讯作者：
Strano, MS
中科院分区：
文献类型：
--
作者：
Heller, DA;Mayrhofer, RM;Strano, MS
对分散的单壁碳纳米管进行凝胶电泳和柱层析，可通过管长和直径同时分离。电泳后的电洗脱显示出高分辨率的纳米管的平均长度在92和435 nm之间。直径分离与长度分离同时发生，切割时间最短的纳米管也具有最大的大直径物质相对富集。较长的超声时间导致电泳增加。凝胶的流动性；因此，超声波处理决定了纳米管的长度和直径分离的程度。随着纳米管长度的缩短，相对量子产率呈非线性降低。这些技术构成了一种制备性的、可扩展的方法，通过电子和传感器应用所需的两个重要属性来分离纳米管。
Gel electrophoresis and column chromatography conducted on individually dispersed, ultrasonicated single-walled carbon nanotubes yield simultaneous separation by tube length and diameter. Electroelution after electrophoresis is shown to produce highly resolved fractions of nanotubes with average lengths between 92 and 435 nm. Separation by diameter is concomitant with length fractionation, and nanotubes that have been cut shortest also possess the greatest relative enrichments of large-diameter species. Longer sonication time causes increased electrophoretic. mobility in the gels; thus, ultrasonic processing determines the degree of both length and diameter separation of the nanotubes. The relative quantum yield decreases nonlinearly as the nanotube length becomes shorter. These techniques constitute a preparative, scalable method for separating nanotubes by two important attributes required for electronic and sensor applications.