"Size-Independent" Single-Electron Tunneling.
"Size-Independent" Single-Electron Tunneling.
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“尺寸无关”单电子隧道效应。
DOI：
10.1021/acs.jpclett.5b02323
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Liu,Gang-Yu
中科院分区：
文献类型：
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作者：
Zhao,Jianli;Sun,Shasha;Swartz,Logan;Riechers,Shawn;Hu,Peiguang;Chen,Shaowei;Zheng,Jie;Liu,Gang-Yu
将金属纳米粒子的单电子隧穿(SET)技术引入现代电子设备，为实现新的性能提供了极大的希望；然而，由于必须将超小(10 Nm)粒子集成到设备中，这在技术上具有很大的挑战性。纳米尺寸的要求是NPs在室温下表现出量子或集合行为的内在要求，例如，10 nm或更小。这项工作代表了对SET的第一次观测，打破了众所周知的大小限制。使用我们新开发的固态甘氨酸基质法制备的多晶金纳米颗粒，对几十纳米大小的颗粒观察到库仑阻塞，并且阻塞电压几乎不依赖于纳米颗粒的大小。乍一看，这些观察结果是违反直觉的。进一步的研究表明，每个观察到的组都来自多晶NP中的超小单晶(S)，该单晶与最近邻的晶体充分隔离。这项工作证明了克服正统的空间限制要求以实现量子效应的概念和可行性。
Incorporating single-electron tunneling (SET) of metallic nanoparticles (NPs) into modern electronic devices offers great promise to enable new properties; however, it is technically very challenging due to the necessity to integrate ultrasmall (<10 nm) particles into the devices. The nanosize requirements are intrinsic for NPs to exhibit quantum or SET behaviors, for example, 10 nm or smaller, at room temperature. This work represents the first observation of SET that defies the well-known size restriction. Using polycrystalline Au NPs synthesized via our newly developed solid-state glycine matrices method, a Coulomb Blockade was observed for particles as large as tens of nanometers, and the blockade voltage exhibited little dependence on the size of the NPs. These observations are counterintuitive at first glance. Further investigations reveal that each observed SET arises from the ultrasmall single crystalline grain(s) within the polycrystal NP, which is (are) sufficiently isolated from the nearest neighbor grains. This work demonstrates the concept and feasibility to overcome orthodox spatial confinement requirements to achieve quantum effects.