Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices
Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices
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DOI：
10.1021/jp0607723
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发表时间：
2006-04-20
影响因子：
3.3
通讯作者：
Heath, JR
中科院分区：
文献类型：
--
作者：
DeIonno, E;Tseng, HR;Heath, JR
以118、73和54埃（2）/分子的堆积密度制备了一种双[2]轮烷的Langmuir-Blodgett离子膜。在蒸发2 nm的钛膜之前和之后，通过红外光谱对单层进行表征，并将其并入分子开关隧道结器件中。该研究表明，蒸发过程主要影响暴露于金属原子源的分子部分。因此，在紧密堆积的单分子层（73和54埃（2）/分子）中，只有存在于分子/空气界面处的[2]轮烷部分明显受到影响，保持开关所需的关键功能不变。在较低压力（118埃（2）/分子）下转移的单层在Ti沉积之后表现出非特异性损伤和差的切换行为。这些结果表明，紧密堆积的单分子膜和牺牲功能显示在分子/空气界面是重要的分子电子器件的设计原则。
Langmuir-Blodgett nionolayers of a bistable [2]rotaxane were prepared at packing densities of 118, 73, and 54 angstrom(2)/molecule. The monolayers were both characterized via infrared spectroscopy before and after evaporation of a 2 nm film of titanium and incorporated into molecular switch tunnel junction devices. The study suggests that the evaporation process primarily affects portions of the molecule exposed to the metal atom source. Thus, in tightly packed monolayers (73 and 54 angstrom(2)/molecule), only the portions of the [2]rotaxane that are present at the molecule/air interface are clearly affected, leaving key functionality necessary for switching intact. Monolayers transferred at a lower pressure (118 angstrom(2)/molecule) exhibit nonspecific damage and poor switching behavior following, Ti deposition. These results indicate that tightly packed monolayers and sacrificial functionality displayed at the molecule/air interface are important design principles for molecular electronic devices.