Physical & Applied Sciences http://irgu.unigoa.ac.in/drs/handle/unigoa/5 2026-10-15T08:28:06Z Moisture detection at ppm level by anodic aluminum oxide thin film capacitive sensor http://irgu.unigoa.ac.in/drs/handle/unigoa/8069 Moisture detection at ppm level by anodic aluminum oxide thin film capacitive sensor Dehkordi, N.H.; Phadte, N.; Ghara, D.; Mondal, P.; Hyam, R.S. In the present investigation, the fabrication of nanoporous anodic aluminum oxide (AAO) thin films via a one-step and two-step anodization process was carried out. It utilizes a binder-free method to form nanostructured AAO films on aluminum foil surface. The impact of anodization conditions on the pore structure was examined using scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffraction (XRD). The bulk porosity and surface hydrophilicity of the AAO films were evaluated using Brunauer-Emmett-Teller (BET) analysis and contact angle measurements. The nanoporous AAO film synthesized via one-step anodization exhibited comparatively higher bulk porosity (42 percent), smaller average pore diameter (37.0 plus-minus 2.3 nm), and superior hydrophilic contact angle of 84.2 degrees. These morphological characteristics directly enhanced water adsorption and capillary condensation within the nanopores. To evaluate the functional response of the porous network, Ag/AAO/Al capacitive structures were tested for low-ppm moisture sensing (20-127 ppm). The device based on one-step AAO exhibited a linear response (R sup(2) = 0.9950), with response and recovery times of 305 s and 31 s, respectively, which is much better compared to two-step AAO samples. These results demonstrate that the controlled tailoring of the AAO morphology enables tunable adsorption properties, supporting its application in porous sensing platforms and moisture-sensitive devices. 2026-01-01T00:00:00Z A Study of Boundary Value Problems for Differential Equations with Deviating Arguments http://irgu.unigoa.ac.in/drs/handle/unigoa/8057 A Study of Boundary Value Problems for Differential Equations with Deviating Arguments Aiya, Heramb B. 2025-02-01T00:00:00Z Development of Empirical Correlations Between Geotechnical Properties and Improvement of Black Cotton Soil in Kolhapur City http://irgu.unigoa.ac.in/drs/handle/unigoa/8045 Development of Empirical Correlations Between Geotechnical Properties and Improvement of Black Cotton Soil in Kolhapur City Guruprasad, Ajay Chavan 2025-01-01T00:00:00Z Structural Health Monitoring of concrete structures by integrating Infrared Thermography with compatible Non Destructive Tests to quantify and characterize defects http://irgu.unigoa.ac.in/drs/handle/unigoa/8043 Structural Health Monitoring of concrete structures by integrating Infrared Thermography with compatible Non Destructive Tests to quantify and characterize defects Naik, Madhuraj Kiran 2025-06-01T00:00:00Z