Selective Gas Sensing with a Single Pristine Graphene Transistor

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• 作者：Sergey Rumyantsev ; Guanxiong Liu ; Michael S. Shur ; Radislav A. Potyrailo ; Alexander A. Balandin
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：May 9, 2012
• 年：2012
• 卷：12
• 期：5
• 页码：2294-2298
• 全文大小：333K
• 年卷期：v.12,no.5(May 9, 2012)
• ISSN：1530-6992

文摘

We show that vapors of different chemicals produce distinguishably different effects on the low-frequency noise spectra of graphene. It was found in a systematic study that some gases change the electrical resistance of graphene devices without changing their low-frequency noise spectra while other gases modify the noise spectra by inducing Lorentzian components with distinctive features. The characteristic frequency f_c of the Lorentzian noise bulges in graphene devices is different for different chemicals and varies from f_c = 10鈥?0 Hz to f_c = 1300鈥?600 Hz for tetrahydrofuran and chloroform vapors, respectively. The obtained results indicate that the low-frequency noise in combination with other sensing parameters can allow one to achieve the selective gas sensing with a single pristine graphene transistor. Our method of gas sensing with graphene does not require graphene surface functionalization or fabrication of an array of the devices with each tuned to a certain chemical.

Keywords:

Graphene; 1/f noise; selective gas sensor; Lorentzian noise