偏差驱动的导电量随着长度的增加而增加
Edmund Leary1,2, Bart Limburg3, Asma Alanazy4,5
1Department of Chemistry, Donnan and Robert Robinson Laboratories , University of Liverpool , Liverpool L69 7ZD , United Kingdom.
Journal of the American Chemical Society
|September 13, 2018
概括
研究人员发现合的氨酸寡合体会随着长度的增加而增强电导率,与典型的分子电线不同. 这一分子电子技术的突破为高效的长距离电荷传输提供了新的可能性.
科学领域:
- 分子电子
- 有机化学
- 凝聚物质物理
背景情况:
- 在分子系统中有效的电荷传输对于开发分子电子设备至关重要.
- 通常,随着长度的增加,分子电线的导电性下降,从而限制了设备的性能.
研究的目的:
- 研究新型合氨酸寡合体的长度依赖导电性.
- 探索分子系统中不寻常的导电性行为的潜在电子机制.
主要方法:
- 一系列合的氨酸寡合体和氨酸结合的氨酸寡合体的合成.
- 这些寡合物的导电性测量作为长度的函数.
- 使用密度函数理论 (DFT) 来理解电子合和能量差距的理论分析.
主要成果:
- 在0. 7V偏向下,合的氨酸寡合体的导电率增加了10倍以上.
- 这种效应归因于高分子轨道与低分子轨道 (HOMO-LUMO) 的差距与寡合体长度的减少.
- 布塔迪因结合的氨酸表现出正常导电性随长度的降低,与偏差依赖的减弱因子 (β) 相关.
结论:
- 合的氨酸寡合体表现出前所未有的长度依赖导电强度,挑战了对分子线的传统理解.
- 这些发现突显了互连连接和电子结构在确定电荷传输特性中的关键作用.
- 观察到的现象可能可以将其推广到其他分子寡合体系统,为分子电子设计开辟新的途径.
相关概念视频
Confirmation Biases
8.3K
The confirmation bias is the tendency to focus on information that confirms our existing beliefs and ignore information that is inconsistent with our expectations. For example, if you think that your professor is not very nice, you notice all of the instances of rude behavior exhibited by the professor while ignoring the countless pleasant interactions he is involved in on a daily basis. Have you ever fallen prey to the confirmation bias, either as the source or target of such bias?
8.3K
Hindsight Biases
4.3K
Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now?
4.3K
Errors in Taping
351
Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...
351
Bias
7.4K
Bias refers to any tendency that prevents a question from being considered unprejudiced. In research, bias occurs when one outcome or answer is selected or encouraged over others in sampling or testing. Bias can occur during any research phase, including study design, data collection, analysis, and publication.
In statistics, a sampling bias is created when a sample is collected from a population, and some members of the population are not as likely to be chosen as others (remember, each member...
In statistics, a sampling bias is created when a sample is collected from a population, and some members of the population are not as likely to be chosen as others (remember, each member...
7.4K
Distance Measurements by Taping
461
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
461
Taping Over Different Ground Profiles
394
Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...
394


