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Temporal Sculpting of Laser Pulses for Functional Engineering of Al2O3/AgO Films: From Structural Control to Enhanced
Doaa Yaseen Doohee1, Abbas Azarian1, Mohammad Reza Mozaffari1
1Department of Physics, University of Qom, Qom 3716146611, Iran.
Sensors (Basel, Switzerland)
|September 27, 2025
Summary
Optimizing laser pulse duration in Al2O3/AgO thin film deposition enhances gas sensor performance. Shorter pulses improve structural properties and sensitivity for NO2 and H2S detection, while longer pulses boost photoconductivity.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Pulsed Laser Deposition (PLD) is a versatile technique for thin film fabrication.
- Al2O3/AgO composite films show promise for various applications, including gas sensing.
- Laser pulse duration is a critical parameter influencing film properties.
Purpose of the Study:
- To investigate the impact of varying laser pulse durations (10, 8, and 6 ns) on Al2O3/AgO thin films.
- To correlate structural, morphological, and optical properties with gas-sensing performance.
- To optimize PLD parameters for advanced gas sensor development.
Main Methods:
- Thin films of Al2O3/AgO were deposited on glass substrates using PLD with controlled pulse durations.
- Structural and morphological characterization using X-ray Diffraction (XRD) and Atomic Force Microscopy (AFM).
- Electrical properties assessed via Hall effect and current-voltage (I-V) measurements; gas sensing evaluated for NO2 and H2S at 250 °C.
Main Results:
- Decreasing pulse duration led to reduced crystallite and grain sizes, improved film compactness, and refined surface morphology.
- A transition from n-type to p-type conductivity was observed with shorter pulse durations, indicating increased hole concentration.
- Enhanced gas sensitivity and faster response/recovery times for NO2 and H2S were achieved with shorter pulse durations due to increased surface area and active sites.
- Photoconductivity improved under illumination, with greater enhancement seen for longer pulse durations.
Conclusions:
- Laser pulse duration significantly influences the structural, morphological, optical, and gas-sensing characteristics of Al2O3/AgO thin films.
- Shorter pulse durations are optimal for developing highly sensitive and responsive Al2O3/AgO-based gas sensors for NO2 and H2S.
- This study provides crucial insights for tailoring PLD processes to engineer functional thin films for specific applications.
