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.
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.
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.
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.
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.
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.
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.
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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