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Experimental study of graphitic nanoribbon films for ammonia sensing
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10.1063/1.3597635
/content/aip/journal/jap/109/12/10.1063/1.3597635
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/12/10.1063/1.3597635

Figures

Image of FIG. 1.
FIG. 1.

Structural data related to GNFs. (a) Scanning electron microscope image of a ∼60 nm thick as-prepared GNF. (b), (c) The width and thickness distribution of the nanoribbons, respectively, obtained from atomic force microscopy measurements on ultra-thin as-prepared GNFs. (d) Raman spectrum of a ∼60 nm thick as-prepared GNF. The inset shows a transmission electron microscope image of a graphitic nanoribbon covered by Pt nanoparticles. (e), (f) C1 and O1 x-ray photoelectron spectra of a ∼60 nm thick as-prepared GNF, respectively. The area and location of the O=C–OH and C–OH peaks observed in C1 and O1 spectra are in very good agreement.

Image of FIG. 2.
FIG. 2.

(Color online) (a) The relative resistance response (Δ/ in %) of as-prepared and Pt-functionalized GNF and CNT film sensors (both ∼60 nm in thickness) when exposed to 50 ppm NH in N as a function of time. The sensor recovery is performed in air. (b) Δ/ for as-prepared GNF and CNT film sensors (both ∼60 nm in thickness) when exposed to 50 ppm NH in N as a function of time. In this case, sensor recovery is performed in N, which does not result in full recovery. The inset shows the current-voltage characteristics for as-prepared and Pt-functionalized GNF sensors when exposed to 50 ppm NH, depicting linear behavior.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Δ/ for the as-prepared GNF sensor (∼60 nm in thickness) as a function of time when it is exposed to different concentrations of NH ranging from 50 to 10,000 ppm in N. There is a monotonic increase in Δ/ for increasing NH concentration. The sensor recovery is performed in air. (b) The maximum Δ/ after 15 min [ ] vs NH concentration for four different types of graphitic nanoribbon film sensors, namely, ultra-thin, 60 nm thick, and 120 nm thick as-prepared and 60 nm thick Pt-functionalized. A power-law dependence of on the concentration is observed, as shown by the dashed line best fits. (c) values calculated from the fits to the response and recovery of the GNF sensor [shown by the dashed lines in (a)] as a function of NH concentration. and correspond to the response, and and correspond to the recovery cycles. All curves show a power-law dependence on the concentration, as indicated by the dashed line best-fits.

Image of FIG. 4.
FIG. 4.

(Color online) Δ/ for an as-prepared GNF sensor (∼60 nm in thickness) when exposed to a 1000 ppm concentration of NH as a function of time at four different temperatures ranging from 20 °C to 125 °C. There is a monotonic increase in Δ/ with temperature. The sensor recovery is performed in air. The inset shows an Arrhenius plot of the absolute value of the time rate of relative resistance change calculated from the initial slope of response and recovery [|d(Δ/)/dt| in %/min] for the same GNF sensor as in the main panel.

Tables

Generic image for table
Table I.

The maximum Δ/ values (after 10 min) and response times for four different types of sensors exposed to 50 ppm NH, extracted from Fig. 2(a) .

Generic image for table
Table II.

The maximum Δ/ values (after 15 min) and response times for an as-prepared GNF sensor when exposed to four different NH concentrations, extracted from Fig. 3(a) .

Generic image for table
Table III.

The values of , , , , , , , and obtained by fitting the data shown in Fig. 3(a) using Eqs. (2) and (3) with two terms in the summation (i.e.,  = 1,2). The fits are shown by the dashed curves in Fig. 3(a) .

Generic image for table
Table IV.

The maximum Δ/ values (after 15 min) and response times for an as-prepared GNF sensor when exposed to 1000 ppm NH at four different temperatures, extracted from Fig. 4 .

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/content/aip/journal/jap/109/12/10.1063/1.3597635
2011-06-16
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental study of graphitic nanoribbon films for ammonia sensing
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/12/10.1063/1.3597635
10.1063/1.3597635
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