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Magnitude and time response of electronic and topographical changes during hydrogen sensing in size selected palladium nanoparticles
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10.1063/1.3603053
/content/aip/journal/jap/110/1/10.1063/1.3603053
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/1/10.1063/1.3603053
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram showing integrated nanoparticle deposition and the sensing response measurement setup.

Image of FIG. 2.
FIG. 2.

TEM micrographs of monodisperse Pd nanoparticle samples (a) Pd15, (b) Pd20, (c) Pd25, and (d) HRTM image of a nanoparticle in sample Pd20.

Image of FIG. 3.
FIG. 3.

Typical histograms showing size distributions for sample Pd20 obtained from (a) TEM and (b) SMPS measurements. represents logarithmic size distribution, where N is the particle concentration and Dp is the mobility diameter.

Image of FIG. 4.
FIG. 4.

Sensing response of sample Pd15 at T = 20 °C for CH  = 4%. Solid and dotted line represent gas “on” and “off” conditions.

Image of FIG. 5.
FIG. 5.

(Color online) (a) A description of variation of sensing response (SR), contributions of electronic effect (EE) and topographical effect (TE) at different time intervals according to Eq. (5). Fitted curve for SR for sample Pd15 along with values of γE and γT are also given. (b) Fitted curve along with the experimental measured data for SR, (c) and (d) contributions due to EE and TE for samples Pd15, Pd20, and Pd25, respectively at CH  = 4% and T = 20 °C.

Image of FIG. 6.
FIG. 6.

(Color online) (a) and (b) Magnitude (γE, γT ) and response time (τE , τT ) for EE and TE, respectively, as a function of nanoparticle size at T = 20 °C and CH  = 4%. τ 0 in Fig. 6(b) is the delay time for TE. It may be noted that γT is negative hence only the magnitude of it is shown. Error bar represents the deviation from the mean value in the fitting. The curves show only the nature of the trend.

Image of FIG. 7.
FIG. 7.

(Color online) (a) Fitted curve along with the experimental measured data for SR. Contribution of (b) EE and (c) TE for sample Pd15 at CH  = 4% and at temperature 20, 40, and 60 °C.

Image of FIG. 8.
FIG. 8.

(Color online) (a) and (b) Magnitude (γ E, γ T) and response time (τE τT ) for EE and TE, respectively, for sample Pd15 as a function of temperature at CH = 4%. τ 0 in Fig. 8(b) is the delay time for TE. It is noted that γT is negative hence only the magnitude of it is shown. Error bar represents the deviation from the mean value in the fitting. The curves show only the nature of the trend.

Image of FIG. 9.
FIG. 9.

(Color online) (a) A plot showing variation of (RE /R 0)−1 versus T −1 for sample Pd15 at CH  = 4%, with given activation energy 14.90 meV. (b) Variation of (RT /R 0)−1 versus for Pd15 at CH  = 4%.

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/content/aip/journal/jap/110/1/10.1063/1.3603053
2011-07-15
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnitude and time response of electronic and topographical changes during hydrogen sensing in size selected palladium nanoparticles
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/1/10.1063/1.3603053
10.1063/1.3603053
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