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Photometer for monitoring the thickness of inkjet printed films for organic electronic and sensor applications
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10.1063/1.3368638
/content/aip/journal/rsi/81/3/10.1063/1.3368638
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/3/10.1063/1.3368638
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Figures

Image of FIG. 1.
FIG. 1.

Diagram of the photometer attached to the exit of an inkjet printer. The light from the LED shines downward and passes through the transparent substrate onto which the sensor (or device) film has been printed. The light that has passed through the substrate and aperture then impinges onto the photodiode-on-a-chip detector.

Image of FIG. 2.
FIG. 2.

Schematic of the electrical components of the photometer. The OPT101 photodiode-on-a-chip detector/transimpedance amplifier circuit is operated with its internal feedback resistor. The output of the detector circuit is fed to an A/D converter computer interface.

Image of FIG. 3.
FIG. 3.

Emission spectrum of the LED used for the described studies. This spectrum was acquired using an Ocean Optics spectrometer with a resolution of around 1 nm.

Image of FIG. 4.
FIG. 4.

Measured vs expected transmittance for the photometer with data acquired by inserting ND filters between the LED and aperture plate (i.e., in place of the transparency). The linearity and near-unity slope indicate proper operation of the photometer for absorbance spectroscopy measurements.

Image of FIG. 5.
FIG. 5.

UV-visible absorbance spectra, acquired with a commercial spectrometer, of 3EG-AuNP films inkjet printed onto transparency films. The number to the left of each spectrum indicates the number of passes of the transparency through the inkjet printer.

Image of FIG. 6.
FIG. 6.

Output voltage of the OPT101 photodiode detector and percent transmittance vs time for inkjet printed 3EG-AuNP films. The -axis represents the time as the transparency passes through the printer. The number to the right of each spectrum indicates the number of passes of the transparency through the inkjet printer.

Image of FIG. 7.
FIG. 7.

Comparison of the absorbance values of the films, obtained from the experiments in Fig. 6, using the custom-built photometer and a commercial UV-visible spectrometer. The UV-visible spectrometer data are for absorbance at 593.75 nm.

Image of FIG. 8.
FIG. 8.

Electrical resistance vs time for several cycles of exposure of three different inkjet printed sensor films to nitrogen gas saturated with ethanol vapor at . The films studied correspond to 1, 10, and 20 passes of inkjet printing, as indicated beneath the respective curve.

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/content/aip/journal/rsi/81/3/10.1063/1.3368638
2010-03-30
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photometer for monitoring the thickness of inkjet printed films for organic electronic and sensor applications
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/3/10.1063/1.3368638
10.1063/1.3368638
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