通向石墨烯的随机行走——诺贝尔奖得主海姆先生感人至深的获奖演讲词(下)

<正>胶带传奇为了制作石墨薄膜,我给了姜达一块厚约几毫米,直径一寸的人造石墨,并建议他用一台抛光机来打磨它。我们有一台很高级的抛光机,可以磨到零点几个微米的平整度。几个月后,姜达给了我一个玻璃盒子,底部躺着一块小小的石墨片。他说这已经是他用抛光机能做到的薄膜的极限了。我用     

A New Effect of Oxygen Plasma on Two-Dimensional Field-Effect Transistors:Plasma Induced Ion Gating and Synaptic Behavior

Plasma treatment is a powerful tool to tune the properties of two-dimensional materials. Previous studies have utilized various plasma treatments on two-dimensional materials. We find a new effect of plasma treatment. After controlled oxygen-plasma treatment on field-effect transistors based on two-dimensional SnSe_2, the capacitive coupling between the silicon back gate and the channel through the 300 nm SiO_2 dielectric can be dramatically enhanced by about two orders of magnitude(from 11 n F/cm~2 to 880 nF/cm~2), reaching good efficiency of ionliquid gating. At the same time, plasma treated devices show large hysteresis in the gate sweep demonstrating memory behavior. We reveal that this spontaneous ion gating and hysteresis are achieved with the assistance of a thin layer of water film automatically formed on the sample surface with water molecules from the ambient air, due to the change in hydrophilicity of the plasma treated samples. The water film acts as the ion liquid to couple the back gate and the channel. Thanks to the rich carrier dynamics in plasma-treated two-dimensional transistors, synaptic functions are realized to demonstrate short-and long-term memories in a single device. This work provides a new perspective on the effects of plasma treatment and a facile route for realizing neuromorphic devices.     

通向石墨烯的随机行走——诺贝尔奖得主海姆先生感人至深的获奖演讲词(上)

<正>如果现在有人想要了解石墨烯美丽的物理内涵,他们可以从许多相关的学术综述,还有大众科学杂志上的文章中选择。在此我向读者推荐自己写的几篇相关的文章(1)~(3),希望大家能原谅我的"自卖自夸"。为了不重复这些文章的内容,在这次演讲里,我决定给大家讲一讲我自己曲折的科研道路,以及这条路最终是如何通向诺贝尔奖的。这其中大部分的内容我从未在别的地方讲述过。当然,各位可以放心,我不会从我的幼儿园时代开始讲