Busra Sennik

Bio: Busra Sennik is an academic researcher from Gebze Institute of Technology. The author has contributed to research in topics: Textile & Materials science. The author has an hindex of 3, co-authored 6 publications receiving 47 citations. Previous affiliations of Busra Sennik include Istanbul Medeniyet University.

Phosphate ion sensors based on triazole connected ferrocene moieties

Abstract: In this paper, we report novel ferrocene-functional thiophene compound (Thi-Fc) and ferrocene side-functional styrene copolymer (P3) as chemical probes for the sensing of phosphate anions via electrochemistry. Besides, selectivity of these ferrocene-appended structures for phosphate ions against Br−, Cl−, and ClO43− were also investigated. These ferrocene-functional molecules were built through 1,3-dipolar cycloaddition reaction between azide-functional groups of their precursors and ethynylferrocene. Their CV experiments showed that both Thi-Fc and P3 have diffusion-controlled redox behavior and Fe2+/Fe3++ redox couple undergoes a quasi-reversible process. They responded to the addition of H2PO4− and HP2O73− anions in the form of their n-Bu4N+ salts by shifting their redox potentials cathodically. The ratio of apparent association constants (K(+)/K(0)) for Thi·H2PO4− (80.06), Thi·HP2O73− (12.29), P3·H2PO4− (12,944.94) and P3·HP2O73− (1040.40) indicated that P3 gave stronger responses to the addition of both salts. Additionally, the interactions of HP2O73− anions with Thi-Fc and P3 are found out to be weaker than those of H2PO4− as indicated by K(+)/K(0) values of the corresponding complexes. The obtained K(+)/K(0) values for Br−, Cl−, and ClO43− anions are very low with respect to those for phosphate anions, indicating Thi-Fc and P3 are selective for phosphate anions against Br−, Cl−, and ClO43−.

Textile‐Integrated Liquid Metal Electrodes for Electrophysiological Monitoring

Abstract: Next generation textile‐based wearable sensing systems will require flexibility and strength to maintain capabilities over a wide range of deformations. However, current material sets used for textile‐based skin contacting electrodes lack these key properties, which hinder applications such as electrophysiological sensing. In this work, a facile spray coating approach to integrate liquid metal nanoparticle systems into textile form factors for conformal, flexible, and robust electrodes is presented. The liquid metal system employs functionalized liquid metal nanoparticles that provide a simple “peel‐off to activate” means of imparting conductivity. The spray coating approach combined with the functionalized liquid metal system enables the creation of long‐term reusable textile‐integrated liquid metal electrodes (TILEs). Although the TILEs are dry electrodes by nature, they show equal skin‐electrode impedances and sensing capabilities with improved wearability compared to commercial wet electrodes. Biocompatibility of TILEs in an in vivo skin environment is demonstrated, while providing improved sensing performance compared to previously reported textile‐based dry electrodes. The “spray on dry—behave like wet” characteristics of TILEs opens opportunities for textile‐based wearable health monitoring, haptics, and augmented/virtual reality applications that require the use of flexible and conformable dry electrodes.

Adhesive free, conformable and washable carbon nanotube fabric electrodes for biosensing

Abstract: Abstract Skin-mounted wearable electronics are attractive for continuous health monitoring and human-machine interfacing. The commonly used pre-gelled rigid and bulky electrodes cause discomfort and are unsuitable for continuous long-term monitoring applications. Here, we design carbon nanotubes (CNTs)-based electrodes that can be fabricated using different textile manufacturing processes. We propose woven and braided electrode design using CNTs wrapped textile yarns which are highly conformable to skin and measure a high-fidelity electrocardiography (ECG) signal. The skin-electrode impedance analysis revealed size-dependent behavior. To demonstrate outstanding wearability, we designed a seamless knit electrode that can be worn as a bracelet. The designed CNT-based dry electrodes demonstrated record high signal-to-noise ratios and were very stable against motion artifacts. The durability test of the electrodes exhibited robustness to laundering and practicality for reusable and sustainable applications.

Polymers with pendant ferrocenes

Abstract: The tailoring of smart material properties is one of the challenges in materials science. The unique features of polymers with pendant ferrocene units, either as ferrocenyl or ferrocenediyl groups, provide electrochemical, electronic, optoelectronic, catalytic, and biological properties with potential for applications as smart materials. The possibility to tune or to switch the properties of such materials relies mostly on the redox activity of the ferrocene/ferricenium couple. By switching the redox state of ferrocenyl units – separately or in a cooperative fashion – charge, polarity, color (UV-vis range) and hydrophilicity of polymers, polymer functionalized surfaces and polymer derived networks (sol–gel) may be controlled. In turn, also the vicinity of such polymers influences the redox behavior of the pendant ferrocenyl units allowing for sensing applications by using polymer bound enzymes as triggering units. In this review the focus is set mainly on the literature of the past five years.

Recent advances in the synthesis, biological activities and various applications of ferrocene derivatives

Abstract: Ferrocene derivatives constitute an important class of organometallic compounds with not only an extensive range of biological activities but also diverse industrial as well as material science applications. These stimulating features of ferrocene derivatives spurred us to review the recent advances in synthesis methods and biological and other applications reported in the latest literature. An effort has been made to summarize the recent developments in synthetic methods providing access to ferrocene scaffolds and the useful medicinal and material applications, including agricultural, catalytic, polymer, conducting, redox mediating, ferrocenyl stationary phase, rocket propellant and ion sensing applications. Ferrocene-based bulky metallocenes are also discussed.

Electrochemical Anion Sensing: Supramolecular Approaches.

Abstract: Anions play a vital role in a broad range of environmental, technological, and physiological processes, making their detection/quantification valuable. Electroanalytical sensors offer much to the selective, sensitive, cheap, portable, and real-time analysis of anion presence where suitable combinations of selective (noncovalent) recognition and transduction can be integrated. Spurred on by significant developments in anion supramolecular chemistry, electrochemical anion sensing has received considerable attention in the past two decades. In this review, we provide a detailed overview of all electroanalytical techniques that have been used for this purpose, including voltammetric, impedimetric, capacititive, and potentiometric methods. We will confine our discussion to sensors that are based on synthetic anion receptors with a specific focus on reversible, noncovalent interactions, in particular, hydrogen- and halogen-bonding. Apart from their sensory properties, we will also discuss how electrochemical techniques can be used to study anion recognition processes (e.g., binding constant determination) and will furthermore provide a detailed outlook over future efforts and promising new avenues in this field.

Highly Fluorescent Pyrene-Functional Polystyrene Copolymer Nanofibers for Enhanced Sensing Performance of TNT

Abstract: A pyrene-functional polystyrene copolymer was prepared via 1,3-dipolar cycloaddition reaction (Sharpless-type click recation) between azide-functional styrene copolymer and 1-ethynylpyrene. Subsequently, nanofibers of pyrene-functional polystyrene copolymer were obtained by using electrospinning technique. The nanofibers thus obtained, found to preserve their parent fluorescence nature, confirmed the avoidance of aggregation during fiber formation. The trace detection of trinitrotoluene (TNT) in water with a detection limit of 5 nM was demonstrated, which is much lower than the maximum allowable limit set by the U.S. Environmental Protection Agency. Interestingly, the sensing performance was found to be selective toward TNT in water, even in the presence of higher concentrations of toxic metal pollutants such as Cd2+, Co2+, Cu2+, and Hg2+. The enhanced sensing performance was found to be due to the enlarged contact area and intrinsic nanoporous fiber morphology. Effortlessly, the visual colorimetric sensi...