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    Fabrication of a Portable Magnetic Microcantilever Using Fe40Ni38Mo4B18 Amorphous Ribbon and Its Application as a Humidity Sensor by Coating with TiO2 Nanotubes
    (Mdpi, 2024) Atalay, Selcuk; Erdemoglu, Sema; Yilmaz, Hatice Caglar; Mete, Emine; Inan, Orhan Orcun; Kolat, Veli Serkan
    Microcantilevers (MCs) are highly sensitive sensors capable of detecting mass changes on the surface at the nanogram and even picogram scale. In this study, microcantilevers were fabricated for the first time using the Sodick AP250L Wire electrical discharge machining (EDM) from amorphous 2826MB (Fe40Ni38Mo4B18) ferromagnetic ribbons. This method is advantageous because it allows for the simultaneous production of a large number of microcantilevers, with about 100 MCs being produced in a single manufacturing process. Additionally, a straightforward and cost-effective measurement system was developed to measure the resonance frequency and frequency shift of the MC entirely through magnetic means, a technique not previously reported in the literature. To evaluate the performance of the MC, we employed it as a humidity sensor. For the TiO2-NT-coated MC, a frequency shift of approximately 202 Hz was observed when the humidity level changed from 5% to 95% relative humidity (RH).
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    Fabrication of a Portable Magnetic Microcantilever Using Fe40Ni38Mo4B18 Amorphous Ribbon and Its Application as a Humidity Sensor by Coating with TiO2 Nanotubes (vol 10, 98, 2024)
    (Mdpi, 2025) Atalay, Selcuk; Erdemoglu, Sema; Yilmaz, Hatice Caglar; Mete, Emine; Inan, Orhan Orcun; Kolat, Veli Serkan
    [Abstract Not Available]
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    Zn-doped TiO2 nanocatalyst for enhanced hydrogen generation via NaBH4 methanolysis
    (Elsevier Sci Ltd, 2026) Balbay, Asim; Erdemoglu, Sema; Yilmaz, Hatice Caglar; Saka, Cafer
    In this study, we report for the first time the strategic Zn doping of TiO2 nanoparticles as an innovative approach to dramatically enhance catalytic hydrogen production via sodium borohydride (NaBH4) methanolysis. This novel Zn-TiO2 nanocatalyst was synthesized by a simple sol-gel method with an optimal Zn doping level of 1 wt%, producing uniform nanospheres with an average size of 8.27 nm. Structural characterizations confirmed the successful incorporation of Zn ions into the TiO2 lattice, inducing oxygen vacancies and significantly increasing surface area-two key factors that synergistically boost catalytic activity beyond that of pure TiO2. As a result, the Zn-TiO2 catalyst delivered a remarkable hydrogen generation rate (HGR) of 20160 mLmin(-1)g(-1) at 30 degrees C with 0.125 g NaBH4. Kinetic analyses revealed strong temperature dependence, with HGR rising from 16,965 to 38145 mLmin(-1)g(-1) between 25-40 degrees C and an activation energy (Ea) of 39.1 kJ mol(-1). Increasing NaBH4 concentration produced an exponential HGR increase, reaching saturation at similar to 0.20 g and peaking at 34,950 mLmin(-1)g(-1) with 0.25 g NaBH4. This work uniquely demonstrates that Zn-induced structural modifications can transform TiO2 into a highly efficient, low-cost catalyst for clean hydrogen production, offering a novel pathway toward scalable and sustainable hydrogen energy systems.