Extreme sensitivity of graphene photoconductivity to environmental gases.
Extreme sensitivity of graphene photoconductivity to environmental gases.
复制标题
DOI：
10.1038/ncomms2235
复制
发表时间：
2012
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
石墨烯是一种单层共价键碳原子，8年前才被发现，但已经引起了广泛的研究和商业兴趣。最初的研究集中在它非凡的电子特性上，比如对无质量狄拉克费米子和半整数量子霍尔效应的观察。现在石墨烯正被应用于触摸屏显示，作为高频晶体管的通道和基于石墨烯的集成电路。石墨烯的独特特性在太赫兹频率电子器件中的应用潜力尤其令人兴奋；然而，探测石墨烯太赫兹频率响应的初步实验才刚刚出现。在这里，我们展示了石墨烯在太赫兹频率下的光电性被大气气体（如氮和氧）的吸附显著改变。此外，我们观察到气体吸附石墨烯的太赫兹受激辐射特征。我们的发现强调了环境条件对高速石墨烯器件设计和制造的重要性。石墨烯是单层碳原子，其高电子迁移率为廉价、高速光电器件提供了潜力。Docherty等人表明，石墨烯中的太赫兹频率光电性关键取决于所吸附环境气体的类型和密度。
Graphene is a single layer of covalently bonded carbon atoms, which was discovered only 8 years ago and yet has already attracted intense research and commercial interest. Initial research focused on its remarkable electronic properties, such as the observation of massless Dirac fermions and the half-integer quantum Hall effect. Now graphene is finding application in touch-screen displays, as channels in high-frequency transistors and in graphene-based integrated circuits. The potential for using the unique properties of graphene in terahertz-frequency electronics is particularly exciting; however, initial experiments probing the terahertz-frequency response of graphene are only just emerging. Here we show that the photoconductivity of graphene at terahertz frequencies is dramatically altered by the adsorption of atmospheric gases, such as nitrogen and oxygen. Furthermore, we observe the signature of terahertz stimulated emission from gas-adsorbed graphene. Our findings highlight the importance of environmental conditions on the design and fabrication of high-speed, graphene-based devices. Graphene is a single layer of carbon atoms whose high electron mobility offers potential for cheap, high-speed opto-electronic devices. Docherty et al. show that the terahertz frequency photoconductivity in graphene depends crucially on the type and density of environmental gas adsorbed.
登录
查看更多内容
影响因子：
56.9
作者：
Nair, R. R.;Blake, P.;Geim, A. K.
通讯作者：
Geim, A. K.
影响因子：
4
作者：
Choi, H.;Borondics, F.;Kaindl, R. A.
通讯作者：
Kaindl, R. A.
影响因子：
3.7
作者：
Berashevich, Julia;Chakraborty, Tapash
通讯作者：
Chakraborty, Tapash
分子氧在掺杂石墨烯上的吸附：原子、电子和磁特性
影响因子：
3.7
作者：
Dai, Jiayu;Yuan, Jianmin
通讯作者：
Yuan, Jianmin
影响因子：
10.8
作者：
George, Paul A.;Strait, Jared;Spencer, Michael G.
通讯作者：
Spencer, Michael G.