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Flaky graphene makes reliable chemical sensors

Date:
January 23, 2012
Source:
American Institute of Physics
Summary:
Researchers have demonstrated that films made of randomly stacked graphene flakes can detect lower concentrations of some chemicals than films made of graphene crystals.
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Scientists from the University of Illinois at Urbana-Champaign and the company Dioxide Materials have demonstrated that randomly stacked graphene flakes can make an effective chemical sensor.

The researchers created the one-atom-thick carbon lattice flakes by placing bulk graphite in a solution and bombarding it with ultrasonic waves that broke off thin sheets. The researchers then filtered the solution to produce a graphene film, composed of a haphazard arrangement of stacked flakes, that they used as the top layer of a chemical sensor. When the graphene was exposed to test chemicals that altered the surface chemistry of the film, the subsequent movement of electrons through the film produced an electrical signal that flagged the presence of the chemical.

The researchers experimented by adjusting the volume of the filtered solution to make thicker or thinner films. They found that thin films of randomly stacked graphene could more reliably detect trace amounts of test chemicals than previously designed sensors made from carbon nanotubes or graphene crystals.

The results are accepted for publication in the AIP's journal Applied Physics Letters.

The researchers theorize that the improved sensitivity is due to the fact that defects in the carbon-lattice structure near the edge of the graphene flakes allow electrons to easily "hop" through the film.


Story Source:

The above post is reprinted from materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


Journal Reference:

  1. Amin Salehi-Khojin, David Estrada, Kevin Y. Lin, Ke Ran, Richard T. Haasch, Jian-Min Zuo, Eric Pop, Richard I. Masel. Chemical sensors based on randomly stacked graphene flakes. Applied Physics Letters, 2012; 100 (3): 033111 DOI: 10.1063/1.3676276

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American Institute of Physics. "Flaky graphene makes reliable chemical sensors." ScienceDaily. ScienceDaily, 23 January 2012. <www.sciencedaily.com/releases/2012/01/120118111526.htm>.
American Institute of Physics. (2012, January 23). Flaky graphene makes reliable chemical sensors. ScienceDaily. Retrieved August 5, 2015 from www.sciencedaily.com/releases/2012/01/120118111526.htm
American Institute of Physics. "Flaky graphene makes reliable chemical sensors." ScienceDaily. www.sciencedaily.com/releases/2012/01/120118111526.htm (accessed August 5, 2015).

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