研究目的
Investigating the influence of irradiation parameters, such as excitation intensity and wavelength, on the response of the ZnO-PDMS sensor against ethanol and oxygen, to optimize the sensing performance of the PL-based ZnO sensors.
研究成果
The study demonstrates that the photoluminescence emission of ZnO-PDMS nanocomposites can effectively monitor environmental changes in ethanol and oxygen atmosphere. Excitation conditions, particularly energy density, significantly influence the sensor response, with optimal performance achieved at low excitation fluence levels.
研究不足
The study is limited to room temperature measurements and does not explore the sensor's performance at elevated temperatures. The detailed chemistry of the interaction between the semiconductor and the analyte is not fully understood.
1：Experimental Design and Method Selection:
The study involved a comparative analysis of the ZnO-PDMS sensor's response to ethanol and oxygen under different excitation wavelengths (248 nm and 355 nm) and energy densities (
2：05?5 mJ/cm2). Sample Selection and Data Sources:
ZnO-PDMS nanocomposites containing 40% w/w ZnO were prepared using commercially available ZnO nanoparticles.
3：List of Experimental Equipment and Materials:
A custom-built optical cell, a commercial ethanol probe, a Pirani gauge, a KrF excimer laser, a Q-switched Nd:YAG laser, a spectrograph, and an intensified charge coupled device detector were used.
4：Experimental Procedures and Operational Workflow:
PL emission was monitored over time for cycles of air-ethanol exposure, with spectra recorded at 10 s intervals.
5：Data Analysis Methods:
The integrated PL emission intensity was calculated and normalized with respect to the laser line scattered off the sample surface.
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