1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Optical anisotropy readout in solid-state porphyrins for the detection of volatile compounds
Rent:
Rent this article for
USD
10.1063/1.3202400
/content/aip/journal/apl/95/9/10.1063/1.3202400
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/9/10.1063/1.3202400
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Lower curves: spectra measured on a 30 ML thick Zn-HepOTTP LS film: (i) before the exposure to ethanol vapors (full line); (ii) after the exposure to ethanol vapors (3%, dotted line, 9%, dashed line, and 18% dashed-dotted line). Upper curves: spectra measured on a 30 ML thick Zn-HepOTTP LS film: (i) before the exposure to hexane (full line); (ii) after the exposure to hexane (3%, dotted line; 9%, dashed line; 18% dashed-dotted line). The reported zero-line is referred to hexane: ethanol curves have been shifted by −0.01 with respect to hexane. The error bar is evaluated as . Each exposure stage was 210 s long. In the inset: (a) curve below: signal measured at 408 nm during the exposure to ethanol vapors of a 30 ML thick Zn-HepOTTP LS film; and (b) curve above: QMD signal measured simultaneously with RAS monitoring, during the exposure to ethanol vapors (see text). In the time period reported in figure, two exposure stages have been considered: 20% (15 430 ppm) and then 40% (30 860 ppm). When the ethanol flux is stopped, the sample is exposed to a pure nitrogen flux. The sign has been chosen to have a similar visual behavior of RAS and QMD signals. The signal-to-noise ratio is evidently lower than in extended spectra; this is due to the shorter integration time necessary to promptly follow the optical signal variation during the gas exposure.

Image of FIG. 2.
FIG. 2.

, defined as the difference between RAS spectra measured before and after the exposure of a 30 ML thick Zn-HepOTTP LS film to increasing quantities of volatile compounds. Top: ethanol (3%: full line, 9%: dotted line, 18%: dashed line). Middle: hexane (3%: full line, 9%: dotted line, 18%: dashed line). Bottom: trimethylamine (3%, corresponding to 90 ppm: full line, 9% corresponding to 270 ppm: dotted line). Significant wavelengths (see text) have been evidenced by vertical dashed lines. Inset: signal amplitudes (from spectra) for ethanol and hexane at characteristic wavelengths vs nominal concentration of VOCs. The lines have been drawn to guide the eyes. The error bar in this case is evaluated as .

Loading

Article metrics loading...

/content/aip/journal/apl/95/9/10.1063/1.3202400
2009-09-01
2014-04-19
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical anisotropy readout in solid-state porphyrins for the detection of volatile compounds
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/9/10.1063/1.3202400
10.1063/1.3202400
SEARCH_EXPAND_ITEM