Cetinkaya, Onur; Altuner, Elif Esra; Yaylali, Figen Varlioglu; Tatli, Havva Nur; Al-Humairi, Safaa Najah Saud

This study investigates the synthesis, characterization, and application of barium titanate nanoparticles (BaTiO₃ NPs) as a fluorimetric sensing platform. Nanocrystalline BaTiO₃ particles, exhibiting quasi-spherical morphology with average diameters evolving from approximately 7 to 9 nm depending on reaction time, were successfully prepared via a room-temperature chemical synthesis route. Comprehensive characterization using techniques such as XRD, SAED, TEM, FTIR, and UV–Vis spectroscopy confirmed the formation of a polycrystalline perovskite structure and elucidated the material's morphological and optical properties. The synthesized BaTiO₃ NPs displayed stable, intrinsic fluorescence, optimally emitting at 467.42 nm upon excitation at ∼402.33 nm in a neutral pH environment (pH 7). This fluorescence was observed to be effectively quenched by multiple analytes, including glucose and paracetamol, establishing a basis for the development of a sensor. Quantitative analysis revealed analyte-dependent quenching efficiencies, with Stern-Volmer studies indicating glucose as the most potent quencher among those kinetically analyzed. The system demonstrated sensitive detection capabilities, achieving low parts-per-million (ppm) limits of detection (LOD) for both glucose (∼1.19 ppm) and paracetamol (∼1.04 ppm). Notably, the linear dynamic response range varied significantly, extending up to ∼1.8 ppm for glucose but reaching at least 3.6 ppm for paracetamol. The demonstrated fluorescence stability, coupled with sensitive and analyte-dependent quenching responses, highlights the potential of these BaTiO₃ nanoparticles as a versatile and robust material for developing future fluorimetric sensors.

AtıfScopus1·WoS1·OpenAlex1

İncele

Jerczynski, Krzysztof; Muszynska, Julita; Demirci, Gokhan; Cetinkaya, Onur; Filipczak, Paulina; Nowaczyk, Grzegorz; Grobelny, Jaroslaw; Matyjaszewski, Krzysztof; Kozanecki, Marcin; Pietrasik, Joanna

This work reports on the efficient performance of hybrids particles with silver nanoparticles (AgNPs) distributed within single polymer molecules with star-like topology as Surface Enhanced Raman Scattering (SERS) supports. First, the library of the star-like polymers with poly (acrylic acid)-block-polystyrene (PAA-b-PS) arms was obtained via atom transfer radical polymerization (ATRP) using a “core-first” approach. Then, hybrid silver nanoparticles were synthesized in a controlled way within the prepared single molecules playing the role of molecular templates for AgNPs. Finally, the hybrid particles were tested as novel substrates for SERS using crystal violet as an analyte. Synthesized star-like templates had varied number of arms within the single star, the order of PAA and PS blocks, their degree of polymerization, and the molar ratio of the carboxylic groups of PAA block to the nanoparticles’ precursor. Additionally, the minimum analyte concentration required for SERS was determined. The number of arms within a polymer template plays a crucial role in the synthesis of silver nanoparticles and observed SERS effect. Prepared substrates were stable for long time and allowed the detection of the analytes on the nanomolar level.

AtıfScopus3·WoS3·OpenAlex3

İncele

Wypych-Puszkarz, Aleksandra; Cetinkaya, Onur; Yan, Jiajun; Udovytska, Ruslana; Jung, Jarosław; Jenczyk, Jacek; Nowaczyk, Grzegorz; Jurga, Stefan; Ulański, Jacek; Matyjaszewski, Krzysztof

Core−shell nanocomposites comprising barium titanate, BaTiO3 (BTO), and poly(methyl methacrylate) (PMMA) chains grafted from its surface with varied grafting densities were prepared. BTO nanocrystals are high-k inorganic materials, and the obtained nanocomposites exhibit enhanced dielectric permittivity, as compared to neat PMMA, and a relatively low level of loss tangent in a wide range of frequencies. The impact of the molecular dynamics, structure, and interactions of the BTO surface on the polymer chains was investigated. The nanocomposites were characterized by broadband dielectric and vibrational spectroscopies (IR and Raman), transmission electron microscopy, differential scanning calorimetry, and nuclear magnetic resonance. The presence of ceramic nanoparticles in core–shell composites slowed down the segmental dynamic of PMMA chains, increased glass transition temperature, and concurrently increased the thermal stability of the organic part. It was also evidenced that, in addition to segmental dynamics, local β relaxation was affected. The grafting density influenced the self-organization and interactions within the PMMA phase, affecting the organization on a smaller size scale of polymeric chains. This was explained by the interaction of the exposed surface of nanoparticles with polymer chains.

AtıfScopus10·WoS9·OpenAlex11

İncele