CORWIN COUPLED RECIPROCAL WINDOWS

该项目的量子设备方面是有限的（对于 矩）的碳纳米管的电导的研究。 管 从乙醇溶液中被吸收到玻璃基板上， 金属（AuPd或Al）在沉积管的顶部蒸发 通过光刻掩模（特征尺寸5微米）， 定义总体特征（焊盘和互连）。 后 蒸发，管是“可见”的纳米操纵器，因为 表面特征，他们创造的金属“窗帘”在他们身上。 将光刻胶旋涂在整个玻璃板上， nanoManipulator用于雕刻光刻图像以形成 用于纳米管的电测量的亚微米特征。 在这样的回路中设置了三个独立的多壁管， 在室温下研究。 选择性蚀刻剂的组合 对于AuPd和多壁管是一种可靠的工艺， 金属接触管。 电阻率（> 0.1 Ohm - cm） 从室温测量推断的结果与 理论预期和其他实验。 由于这些 多层管上的测量结果更难整齐地解释 因为我们有可靠的单壁管来源， 实验室，现在的多壁管已不再是重点， 实验 单壁纳米管更有趣的例子是 （SWNT）还没有通过可靠的工艺生产。 所用HNO_3 蚀刻AuPd似乎插入并分散SWNT束， 当金钯被蚀刻掉时就暴露出来了 我们因此 恢复到用Al和Al的选择性蚀刻剂涂覆管 似乎是更良性的SWNT束：他们仍然在 去除Al覆盖层。 目前，室温电气 对暴露的单壁碳纳米管束进行测量。

The quantum device aspects of the project are limited (for the moment) to the study of conductance of carbon nanotubes. The tubes are absorbed from an ethanol solution onto a glass substrate and then metal (either AuPd or Al) is evaporated atop the deposited tubes through an optical lithographic mask (feature size 5 micron) that defines gross features (pads and interconnects). After the evaporation, tubes are "visible" to the nanoManipulator because of the surface features they create as the metal "drapes" over them. Photoresist is spun onto the whole glass plate, and the nanoManipulator is used to carve lithographic images to form the sub-micron features for the electrical measurement of the nanotube. Three separate multiwall tubes have been set in such circuits and studied at room temperature. The combination of selective etchants for AuPd and multiwall tubes is a reliable process for making the metal contacts to the tubes. The resistivity (> 0.1 Ohm - cm) inferred from room-temperature measurements is consistent with theoretical expectations and other experiments. Since these measurements on multiwall tubes are more difficult to interpret tidily and since we have a reliable source of single-wall tubes in Zhou's lab, for now the multiwall tubes have ceased to be the focus of experiments. The more interesting case of single-wall nanotubes (SWNT) has yet to be produced by a reliable process. The HNO_3 used to etch AuPd appears to intercalate and disperse the SWNT bundles that have been exposed when the AuPd is etched away. We have therefore reverted to coating the tubes with Al and the selective etchant for Al appears to be more benign to the SWNT bundles: they remain upon removal of the Al overlayer. At present, room-temperature electrical measurements are proceeding on the exposed SWNT bundles.