Department of Physics
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Item Investigation and Fabrication of Piezoelectric Based Nanogenerators for Energy Harvesting Applications(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Faisal Ali; CUI/FA23-RPH- 014/LHR; Dr. Amna Mir; LHR TP 9845PENGs (piezoelectric nanogenerators) have emerged a promising technology to harvest electrical energy from mechanical stress (pressure, vibrations) to empower the small-scale electronic devices. This study focuses on the investigation and fabrication of piezoelectric- based nanogenerators for energy harvesting applications. We designed and developed nanostructured devices by manipulating the piezoelectric properties of materials NaNbO3 (sodium niobate) for efficient energy conversion. The process for the fabrication of devices involved advanced techniques including hydrothermal synthesis, ink synthesis and EHD (electrohydrodynamic) printing for thin film deposition of NaNbO3 to achieve high- performance nanostructure with enhanced piezoelectric response of material and device. The materials and nanogenerators were characterized for their electrical properties and electrical output under various mechanical conditions e.g. UV, FTIR, Raman, XRD for material and IVfor device. Experimental results demonstrated a significant output voltage. The study also demonstrated the integration of PENGs with flexible substrates and the material is environmentally friendly for wearable, implantable devices and self-powered sensors. The work highlights the nanogenerators could be a good solution for sustainable energy harvesting in next-generation electronic devices.Item Investigation and Fabrication of Triboelectric base Nanogenerators for Energy Harvesting Applications(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Muhammad Bilal; CIIT/FA23-RPH-026/LHR; Dr. Amna Mir; LHR TP 9855The increased need for renewable and sustainable energy sources has led to the idea of the Triboelectric Nanogenerators (TENGs), which are considered one of the promising sources of energy that can be converted into electricity at low frequencies. This article reports the design synthesis and fabrication of a compact, high-performing TENG using a composite high-surface-area polyacrylonitrile (PAN) nanofiber with zeolitic imidazolate framework-8 (ZIF-8), a metal-organic framework (MOF) that exhibits structural discretion. The production of ZIF-8 was based on a solvothermal approach, utilizing zinc nitrate and 2-methylimidazole in methanol. The output of PAN nanofibers was achieved through the electrospinning process. A vertical contact- separation mode TENG was developed using the PAN@ZIF-8 composite as a tribo- positive layer and polyethylene terephthalate (PET & Teflon) as the tribo-negative layer. XRD, SEM, FTIR, Raman spectroscopy, UV-Vis, and IV were conducted to characterize the materials. The crystallinity of ZIF-8 was established through the XRD, whereas Raman and FTIR spectra ratified the Zn-N bonding and the integrity of the functional groups. UV-Visible analysis gave a broad optical bandgap of 5.04 eV. The TENG-fabricated device produced a periodically alternating current in response to mechanical stimulation, making it suitable for energy harvesting. The outcomes suggest the potential use of MOF-polymer composites in enhancing the triboelectric capabilities of the material and its applications in wearable electronic systems, self- powered sensors, and IoT devices.