CORWIN COUPLED RECIPROCAL WINDOWS

CORWIN 耦合倒易窗

• 批准号: 6326164
• 负责人: Frederick P BROOKS
• 金额: $ 11.63万
• 依托单位: UNIV OF NORTH CAROLINA CHAPEL HILL
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-15 至 2001-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6326164
• 关键词: biological products; biomedical resource; computers

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.

该项目的量子设备方面是有限的（对于 矩）来研究碳纳米管的电导。 管子 从乙醇溶液中吸收到玻璃基板上，然后 金属（AuPd 或 Al）在沉积管顶部蒸发 通过光学光刻掩模（特征尺寸 5 微米） 定义总体特征（焊盘和互连）。 之后 蒸发时，管子对纳米操纵器来说是“可见的”，因为 当金属“覆盖”在它们上面时，它们会产生表面特征。 将光刻胶旋涂到整块玻璃板上， 纳米操纵器用于雕刻光刻图像以形成 用于纳米管电学测量的亚微米特征。 在这样的回路中设置了三个独立的多层管，并且 在室温下研究。 选择性蚀刻剂的组合 对于 AuPd 和多壁管来说，是一种可靠的制造工艺 与管子的金属接触。 电阻率（>0.1欧姆-厘米） 从室温测量推断是一致的 理论预期和其他实验。 由于这些 多层管的测量更难以整齐地解释 由于我们在周氏拥有可靠的单壁管来源 实验室，目前多壁管已不再是重点 实验。 单壁纳米管更有趣的例子 （SWNT）尚未通过可靠的工艺生产。 使用的HNO_3 蚀刻 AuPd 似乎会插入并分散 SWNT 束， 当 AuPd 被蚀刻掉时就暴露出来了。 因此我们有 恢复到用铝和铝的选择性蚀刻剂涂覆管子 似乎对 SWNT 束更有利：它们仍然位于 去除铝覆盖层。 目前，常温电 正在对暴露的单壁碳纳米管束进行测量。