CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Adv Mater. 2019 Nov;31(45):e1804864. doi: 10.1002/adma.201804864. Epub 2019 Jan 27.
Although metal nanoparticles (NPs) stabilized with self-assembled monolayers (SAMs) of various organic ligands have proven useful in applications ranging from chemical sensing, to bionanotechnology, to plasmonics and energy conversion, they have not been widely considered as suitable building blocks of electronic circuitry, largely because metals screen electric fields and prevent electrically tunable conductivity. However, when metal nanoparticles a few nanometers in size are stabilized by charged ligands and placed under bias, the counterions surrounding the NPs can redistribute and establish local electric fields that feed back into the electronic currents passing through the nanoparticles' metallic cores. Herein, the manner in which the interplay between counterion gradients and electron flows can be controlled by using different types of SAMs is discussed. This can give rise to a new class of nanoparticle-based "chemoelectronic" logic circuits capable of sensing, processing, and ultimately reporting various chemical signals.
虽然用各种有机配体自组装单分子层稳定的金属纳米粒子 (NPs) 在从化学传感到生物纳米技术、等离子体学和能量转换等应用中已经被证明是有用的，但它们并没有被广泛认为是适合电子电路的构建块，主要是因为金属会屏蔽电场并阻止电可调导电性。然而，当大小为几纳米的金属纳米粒子被带电配体稳定并施加偏压时，纳米粒子周围的抗衡离子可以重新分布并建立局部电场，这些电场反馈到穿过纳米粒子金属核的电子流中。在此，讨论了通过使用不同类型的自组装单分子层来控制抗衡离子梯度和电子流相互作用的方式。这可以产生一类新的基于纳米粒子的“化学生物电子”逻辑电路，能够感测、处理和最终报告各种化学信号。
