Browsing by Author "Kivrak, Arif"

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Atomic Molar Ratio Optimization of Carbon Nanotube Supported Pdauco Catalysts for Ethylene Glycol and Methanol Electrooxidation in Alkaline Media
(Springer international Publishing Ag, 2019) Ulas, Berdan; Caglar, Aykut; Kivrak, Arif; Kivrak, Hilal
In this study, carbon nanotube supported Pd, PdAu, and PdAuCo electrocatalysts (Pd/CNT, PdAu/CNT, and PdAuCo/CNT) were synthesized via NaBH4 reduction method at varying molar atomic ratios to investigate their performance for methanol and ethylene glycol electrooxidation in alkaline media. The characterization of the as-prepared catalysts was performed using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, N-2 adsorption-desorption, and small-angle X-ray-scattering analysis. From the physical characterization results, it was seen that PdAuCo/CNT catalysts were successfully prepared. X-ray photoelectron spectroscopy results showed that Pd and Au atoms employed in the preparation of the catalysts exist mainly in their elemental state. X-ray diffraction results indicated the formation of a new phase. Furthermore, the mean particle size of Pd50Au30Co20/CNT was determined as 7.9 and 8.7nm using small-angle X-ray scattering and transmission electron microscopy analyses. Pd50Au30Co20/CNT demonstrated the type V adsorption isotherms with H1-type hysteresis, which indicates the mesoporous structure of the catalyst. Electrocatalytic activity of the catalysts for ethylene glycol and methanol electrooxidation was investigated with cyclic voltammetry and electrochemical impedance spectroscopy. The electrocatalytic activity of Pd50Au30Co20/CNT was determined as 262 and 694mA/mg Pd for methanol and ethylene glycol electrooxidation. In accordance with cyclic voltammetry and electrochemical impedance spectroscopy results, Pd50Au30Co20/CNT possesses the highest electrocatalytic activity for both electrooxidation.
Benzotiyofen@pd as an Efficient and Stable Catalyst for the Electrocatalytic Oxidation of Hydrazine
(Elsevier Sci Ltd, 2022) Kaya, Sefika; Ozok-Arici, Omruye; Kivrak, Arif; Caglar, Aykut; Kivrak, Hilal
An efficient methods for the synthesis of 2-(2,5-dimethylphenyl)-3-iodobenzo[b]thiophene (4) is described, and investigated its anode catalyst performance by using electrochemical methods (CV, CA and EIS). When 2-(2,5dimethylphenyl)-3-iodobenzo[b]thiophene (4) is applied, the specific activity is found as 25.811 mA/cm(2). Interestingly, when Palladium (Pd) is electrochemically deposited on the benzothiophene derivative, the catalytic activity increased the 80.930 mA/cm(2). This result is highest than the current metal based anode catalyst. Moreover, EIS and CA measurements display that Pd doped benzothiophene organic catalyst have high stability, and give the low charge transfer resistance. Energy dispersive X-ray (SEM-EDX), electron microscopy, TEM are used for the determination of its surface morphology. As a result, 2-(2,5-dimethylphenyl)-3-iodobenzo[b]thiophene (4) may be alternative electro-catalysts in fuel cell applications.
Bimetallic Ruthenium-Cobalt Catalyst Supported on Carbon Nanotubes: Synthesis, Characterization, and Application in Electrochemical Sensing of Isoleucine
(Wiley, 2025) Arici, Omruye Ozok; Caglar, Aykut; Najri, Bassam A.; Aktas, Nahit; Kivrak, Arif; Kivrak, Hilal
In this work, a bimetallic Ru-Co catalyst based on carbon nanotubes (Ru-Co/CNT) with a Ru to Co ratio of 95:5 is developed. The catalyst, featuring a total metal loading of 3% on the CNTs, is synthesized using the NaBH4 reduction method. Several analytical analyses are used to detect the properties of the Ru-Co/CNT catalyst. X-ray diffraction (XRD) provides information on crystal structures of the catalysts, high-resolution transmission electron microscopy (HR-TEM) reveals particle size and distribution, inductively coupled plasma mass spectrometry (ICP-MS) measures the elemental composition, and X-ray photoelectron spectroscopy (XPS) use to investigate the chemical oxidation states. In addition, thermal techniques including temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO), and temperature-programmed desorption (TPD) are used to recognize the active sites on the catalyst's surface and the acidity. Then, the Ru-Co/CNT catalyst is applied as a sensor for isoleucine amino acid for the first time. It shows high performance with these parameters, sensitivity (0.002 mA cm-2 mm), LOD - limit of detection (0.04 mu m), and LOQ - limit of quantification (0.12 mu m). Moreover, the interferences of common serum blood including (D-glucose, uric acid, ascorbic acid, and L-tryptophan) are studied. The findings indicated that the sensor is applicable to work in complex biological systems.
Budaklı (Bi̇tli̇s) Kaplıcasının Jeokimyasal Özellikleri İle Alanın Jeolojik ve Coğrafi Yapısı Arasındaki İlişki
(2019) Kivrak, Arif; Avşin, Nurcan; Kavak, Emrah
Termal kaynaklar, magma haznesine yakın olan ya da tektonik olarakaktif bölgelerdeki yer altı sularının magma nedeniyle ısınarak yeryüzüne çıkmasıile oluşmaktadır. Bu süreçte, magma içerisinde eriyik halde bulunan maddeler ilesuyun temas ettiği kayaçlardaki çeşitli elementlersıcak suya karışarak, kaynaklarıninsan sağlığı için şifalı ya da zararlı olmasına neden olabilmektedir. Dolayısıylakaplıca, ılıca gibi isimler de verilen bu kaynaklar, sodyum, flor, kalsiyum gibifaydalı elementlerin yanı sıra, cıva, uranyum, arsenik gibi ağır metaller deiçerebilmektedir. Türkiye, aktif tektonik bir ülke olması nedeniyle çok sayıdatermal kaynağa sahiptir. Araştırma alanı olarak seçilen Budaklı kaplıcası daBitlisili, Güroymak ilçesi sınırları içerisinde, Nemrut kraterinin batısında yer almaktadır.Bu araştırma, yıllardır yoğun şekilde kullanılan Budaklı kaynağınınjeokimyasal özelliklerini tespit etmek, kaynağın içerdiği elementlerin zarar yada faydalarını ortaya koyarak hangi hastalıkların tedavisinde kullanılabileceğinianaliz etmek, Budaklı kaplıcasınınolanaklarının geliştirilmesine katkıda bulunmakamacıyla ele alınmıştır. Bu kapsamda gerçekleştirilen arazi ve büro çalışmaları neticesinde, alanın coğrafi ve jeolojik yapısının sıcak su kaynağının oluşumu veyeryüzüne ulaşmasındaki rolü incelenmiş, kaplıcadan alınan su numunelerininkimyasal analizleri yapılarak element özellikleri belirlenmiştir. Buna göre Budaklıkaplıcası, önemli miktardakalsiyum, sodyum, potasyum ve flor içermektedir.
A Camouflage Material: P- and N-Type Dopable Furan Based Low Band Gap Electrochromic Polymer and Its Edot Based Copolymer
(Pergamon-elsevier Science Ltd, 2015) Kavak, Emrah; Us, Cansu N.; Yavuz, Ejmer; Kivrak, Arif; Ozkut, Merve Icli
A Donor-Acceptor-Donor (D-A-D) type monomer, 4,9-di(furan-2-yl)-6,7-diphenyl-[1,2,5]thiadiazolo[3,4g] quinoxaline (1), was synthesized via Stille Coupling reaction and polymerized electrochemically. The obtained polymer (P1) has low band gap (0.85 eV) and showed electrochromic property (pale mustard-colored in neutral state, grey in oxidized state and brown in reduced state). Moreover, copolymerization of 1 was carried out with EDOT for the formation of P(1-co-EDOT) which exhibits higher electrochemical stability than its homopolymer (P1) and have intriguing electrochromic property with a color change from the tunes of brown to the tunes of green. The band gap of copolymer was calculated as 1.1 eV. (C) 2015 Elsevier Ltd. All rights reserved.
Carbon Monoxide and Formic Acid Electrooxidation Study on Au Decorated Pd Catalysts Prepared Via Microwave Assisted Polyol Method
(Taylor & Francis inc, 2019) Ulas, Berdan; Kivrak, Arif; Aktas, Nahit; Kivrak, Hilal
In this study, carbon supported Pd monometallic and PdAu bimetallic catalysts are prepared by using microwave assisted polyol method to investigate their carbon monoxide and formic acid electrooxidation activities. These catalysts are characterized by using Scanning Electron Micrsocopy (SEM-EDX) and N-2 adsorption desorption measurements. EDX measurements reveal that catalysts are prepared at desired ratios. The electrochemical characterization was performed via cyclic voltammetry and CO stripping voltammetry. Electrochemical surface area (ECSA) was calculated thanks to CO oxidation peaks. It was reported that CO tolerance and ECSA of the PdAu/C catalysts were higher than that of the Pd/C, attributed to sweeping effect of Au particles in terms of CO adsorption. Furthermore, formic acid electrooxidation activity of these catalysts are examined by using cyclic voltammetry (CV). PdAu/CNT catalyst at prepared at 90:10 Pd:Au ratio exhibited the highest formic acid electroxidation activity. It is clear that PdAu/CNT catalyst is a promising catalyst for CO and formic acid electrooxidation. [GRAPHICS] .
Catalytic Electro-Oxidation of Hydrazine by Thymol Based-Modified Glassy Carbon Electrode
(Elsevier Sci Ltd, 2022) Sharif, Kawa Hama; Kivrak, Hilal; Ozok-Arici, Omruye; Caglar, Aykut; Kivrak, Arif
In the present, thymol based new organic compounds (4A , 4B and 4C) are designed and synthesized via Steglich Esterification Reactions and Pd-catalyst Sonogashira Coupling Reactions. After isolation and characterization, thymol based hybrid molecules are used for hydrazine (N2H4) electrooxidation reactions as anode catalysts. A variety of metal based anode catalyst have been reported in literature, but this study may be the first study for thymole based hybrid molecules as an anode catalyst in fuel cells. The performance of hybrid molecules was investigated via cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in hydrazine solution. Hybrid 2-isopropyl-5-methylphenyl-4-oxo-4-(5-(p-tolylethynyl)thiophen-2-yl)butanoate (4C) gives the highest performance as 3.66 mAcm(-2) (17.24 mAmg(-1)). Our results displayed that natural products like thymol derivatives may be new generation anode catalyst for fuel cells, and they may be alternative for expensive Pd and Pt based metal anode catalyst.
A Comparative Analysis for Anti-Viral Drugs: Their Efficiency Against Sars-Cov
(Elsevier, 2021) Kivrak, Arif; Ulas, Berdan; Kivrak, Hilal
Coronavirus, known as the coronavirus pandemic, is continuing its spread across the world, with over 42 million confirmed cases in 189 countries and more than 1.15 million deaths. Although, scientists focus on the finding novel drugs and vaccine for SARS-CoV-2, there is no certain treatment for it. Antiviral drugs such as; oseltamivir, favipiravir, umifenovir, lopinavir, remdesivir, hydroxychloroquine, chloroquine, azithromycin, ascorbic acid, corticosteroids, are mostly used for patients. They prevent cytokine storm that is the main reason of deaths related to SARS-CoV-2. In addition, anti-inflammatory agents have critical roles to inhibit the lung injury and multisystem organ dysfunction. The combination with anti-viral drugs with other drugs displays high synergistic effects. In the present study, the drugs used for Covid-19 are analyzed and compare the efficiency for the Covid-19 patients from the different continents including USA, South Korea, Italy, Spain, Germany, Russia, Brazil, Turkey, and China. Nowadays, all countries tried to find vaccine and new drug candidates for SARS-CoV-2, but anti-viral drugs may be the best candidates for the treatment of Covid-19 before finding novel anti-Covid drug.
Design and Synthesis of Novel Thieno-Dibenzothiophene Derivatives
(Amer Chemical Soc, 2017) Kivrak, Arif; Algso, Muheb
Design of 2-(4 Based Remarkable Organic Catalyst Towards Hydrazine Electrooxidation
(Elsevier Science Sa, 2021) Er, Omer Faruk; Ulas, Berdan; Ozok, Omruye; Kivrak, Arif; Kivrak, Hilal
Herein, 2-(4-(2-pentyllbenzo[ b]thiophen-3-yl)benzylidene)malononitrile (6B) is synthesized by using coupling reactions, electrophilic cyclization reactions, and condensation reactions. Then, these materials are employed as anode catalysts for hydrazine electrooxidation reactions with electrochemical methods such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in 1 M KOH + 0.5 M N2H4 solution on different benzothiophene derivates. 6B catalyst exhibits the best catalytic activity in hydrazine electrooxidation reaction with 3.22 mA cm(-2) (16.72 mA mg(-1) 6B) value. Thus, for the electrodes obtained from 6B, the electrode preparation stage is optimized by the response surface methodology (RSM) and the hydrazine electrooxidation current under optimum conditions is found as 4.95 mA cm(-2). EIS results reveal that 6B modified electrode has the lowest charge transfer resistance. In conclusion, 6B catalyst could be used as anode catalysts in hydrazine fuel cells instead of expensive catalysts such as Pt, Pd, and Au.
Design, Synthesis and Pharmacological Evaluation of Novel Artemisinin-Thymol
(Taylor & Francis Ltd, 2022) Kavak, Emrah; Mutlu, Dogukan; Ozok, Omruye; Arslan, Sevki; Kivrak, Arif
A molecular hybridization of natural products is a new concept in drug discovery and having critical roles to design new molecules with improved biological properties. Hybrid molecules display higher biological activities when compared to the parent drugs. In the present study, two natural products (thymol and artemisinin (ART)) are used for the synthesis of new hybrid thymol-artemisinin. After characterization, the cytotoxic activity of ART-thymol was tested against different cancer cell lines and non-cancerous human cell line. ART-Thymol show the cytotoxic effect with EC50 values 70,96 mu M for HepG2, 97,31 mu M for LnCap, 6,03 mu M for Caco-2, 77,98 mu M for HeLa and 62,28 mu M for HEK293 cells, respectively. Moreover, ART-Thymol was checked for drug-likeness, and the kinase inhibitory activity. ART-Thymol is investigated by using molecular docking. The results of qPCR was indicated CDK2 and P38 were inhibited by ART-Thymol. These results improved that thymol-artemisinin may be new candidates as an anticancer agents. [GRAPHICS] .
Design, Synthesis, and in Vitro Evaluation of Thieno[A]dibenzothiophene Derivatives
(Wiley-v C H verlag Gmbh, 2020) Konus, Metin; Algso, Muheb A. S.; Kavak, Emrah; Kurt-Kizildogan, Aslihan; Yilmaz, Can; Kivrak, Arif
A variety of highly substituted thieno[2,3-a]dibenzothiophenes and thieno[3,2-a]dibenzothiophenes are readily prepared via cascade electrophilic cyclization reaction. The reaction was tolerated a variety of compounds. In the present study, antimicrobial and antifungal activities were investigated for all synthesized molecules against A. niger ATCC 16404, C. albicans ATCC 10231, S. aureus ATCC 25923 and B. subtilis ATCC 6633, respectively.
Determination of Antioxidant, Antimicrobial and Anticancer Properties of Newly Synthesized 2-Methoxyphenyl Thiophene Derivatives
(Wiley-v C H verlag Gmbh, 2024) Cetin, Dogan; Konus, Metin; Yilmaz, Can; Arslan, Sevki; Abdelsalam, Aminehafis; Hutanu, Elena Daniela; Kivrak, Arif
In this study, antioxidants, anticancer, and antimicrobial properties of four newly synthesized thiophene derivatives were investigated. In addition, basic ADME properties were calculated in silico. According to the study's findings, tested compounds antioxidant activity was weaker than the standards in both the FRAP and ABTS assays. The MTT analysis revealed that the chemicals 3 and 4 were cytotoxic to every cancer cell line that was tested. 3 and 4 increased the rate of apoptosis in the tested cancer cells at levels close to that in the positive control group. The gene expression levels of apoptotic markers (BAX, Bcl-2, Casp-3, -8, and -9) detected at all cell lines after incubation with 3 and 4 were changed as expected for apoptotic agents, except Bcl-2 of HT-29. It was concluded that the addition of bromine to C2 of thiophene cycle of 3, resulted 4 with greater apoptotic potential probably because of a change in molecular conformation and ligand exchange kinetics. Compound 3 was found to have antifungal activity against Aspergillus niger, while 4 was found to have antibacterial activity on gram-positive bacteria. In silico ADME/T analysis revealed that 3 and 4 were able to pass through the gastrointestinal tract lumen and blood-brain barrier.
Electrochemical Detection of Malathion Pesticide Using Acetylcholinesterase Biosensor Based on Glassy Carbon Electrode Modified With Conducting Polymer Film
(Springer Heidelberg, 2016) Guler, Muhammet; Turkoglu, Vedat; Kivrak, Arif
Acetylcholinesterase (AChE) biosensor based on conducting poly([2,2;5';2 '']-terthiophene-3-carbaldehyde) (PTT) modified glassy carbon electrode (GCE) was constructed. AChE was immobilized on PTT film surface through the covalent bond between aldehyde and amino groups. The properties of PTT modified GCE were studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The biosensor showed an oxidation peak at +0.83 V related to the oxidation of thiocholine, hydrolysis product of acetylthiocholine iodide (ATCI), catalyzed by AChE. The optimum current response of the biosensor was observed at pH 7.5-8.0, 40 degrees C and 120 U/cm(2) of AChE concentration. The biosensor showed a high sensitivity (183.19 mu A/mM), a linear range from 0.015 to 1.644 mM, and a good reproducibility with 1.7 % of relative standard deviation (RSD). The biosensor showed a good stability. The interference of glycin, ascorbic acid, histidine, uric acid, dopamine, and arginine on the biosensor response was studied. An important analytical response from these inteferents that overlaps the biosensor response was not observed. The inhibition rate of malathion as a model pesticide was proportional to its concentrations from 9.99 to 99.01 nM. The detection limit was 4.08 nM.
Electrochemical Dopamine Sensor Based on Gold Nanoparticles Electrodeposited on a Polymer/Reduced Graphene Oxide-Modified Glassy Carbon Electrode
(Taylor & Francis inc, 2022) Guler, Muhammet; Kavak, Emrah; Kivrak, Arif
A novel electrochemical dopamine (DA) sensor based on Au nanoparticles (AuNPs) electrochemically loaded on poly([2,2 ';5 ',2 '']-terthiophene-3 '-carbaldehyde)/reduced graphene oxide (poly(TTP)/rGO) improved glassy carbon electrode (GCE) was fabricated. The Au@poly(TTP)/rGO/GCE was evaluated using cyclic voltammetry (CV), differential pulse voltammetry (DPV), amperometry, and electrochemical impedance spectroscopy (EIS). The optimized Au@poly(TTP)/rGO/GCE sensor had a wide electroactive surface area and exhibited good selectivity. The linear determination range of the sensor was from 0.02 to 232 mu M with a sensitivity of 315 mu A/mM/cm(2). The limit of detection (LOD) was estimated to be 11.5 nM using signal-to-noise (S/N) ratio of 3. Additionally, the sensor displayed excellent selectivity, satisfactory response time from 4.5 to 6 s, replicability with a relative standard deviation (RSD) of 2.31%, reproducibility with a RSD of 3.67%, and storage stability with 92.57% of its initial current response for 37 days. The Au@poly(TTP)/rGO/GCE was employed to estimate DA in injection samples.
Electrochemical Polymerization of a New Alkoxy-Bridged Dithieno (3,2-b:2',3 Pyrrole Derivative
(Tubitak Scientific & Technological Research Council Turkey, 2018) Kivrak, Arif; Yildiz, Huseyin Bekir; Gokyer, Selahattin; Bezgin Carbas, Buket
A novel alkoxy-bridged dithieno (3, 2-B:2',3'-D) pyrrole (DTP) derivative was synthesized and its corresponding polymer poly(1,2-bis(2-(4H-dithieno[3,2-b:2',3'-d]pyrrol-4-yl)ethoxy)ethane) (P(DTP-alkoxy-DTP)) was successfully obtained electrochemically. The effects of alkoxy bridge in the structure on the electrochemical and spectroelectro-chemical properties of the polymer were also investigated in detail. The results showed that the polymer film exhibits multielectrochromic behavior and a low band gap of 1.82 eV.
Electrosynthesis of a New Indole Based Donor-Acceptor Type Polymer and Investigation of Its Electrochromic Properties
(Elsevier Science Sa, 2017) Carbas, Buket Bezgin; Kivrak, Arif; Kayak, Emrah
The purpose of this research is to synthesize a novel monomer, namely, 1-mety1-2,3-di(thiophen-2-y1)-1H-indole (DTI) and to present optical and electrochemical characterization of its corresponding polymer film, P(DTI). The donor thiophene unit was matched with acceptor indole unit in consideration of donor acceptor-donor approach in order to achieve DTI monomer. This monomer was electropolymerized in the medium 0.1 M LiClO4/Ethanol:ACN solution mixture and a conductive indole based polymer, P(DTI) was obtained. The spectroelectrochemical studies show that P(DTI) has a band gap of 2.45 eV and a color change from pale green to dark green with a switching time of 0.9 s during oxidation and a high coloration efficiency (286 cm(2)/C) at 830 nm. Furthermore, P(DTI) shows good environmental and redox stability with a retention of 85% after 1500th switching. (C) 2016 Elsevier B.V. All rights reserved.
Elektron Sunucu-elektron Alıcı- Elektron Sunucu Yönteme Göre Tasarlanmış, Elektrokromik, Düşük Bant Aralıklı, Tiyadiazol ve Furan Bazlı Polimerlerin Sentezi ve Karakterizasyonu
(2015) Özkut, Merve İçli; Kivrak, Arif
İletken polimerler, anorganik malzemelere göre taşıdıkları bir takım üstün özelliklerinden (yalnızca monomerik birimin tasarlanması ile polimerin optik ve elektronik özelliklerinin düzenlenebilmesi, birçok rengi tek bir malzeme ile elde edebilmesi, kolay ve ucuz sentez yöntemleri ve kolaylıkla işlenebilmeleri gibi) dolayı, günümüzde güneş pillerinde, tranzistörlerde, biosensörlerde, gaz sensörlerinde, ışık saçan diyotlarda, telekominikasyon uygulamalarında, elektrokromik ekranlarda/ aynalarda/ pencerelerde/ kağıtlarda, kamuflaj malzemesi olarak sıkça kullanılmaktadır. Bu noktada en önemli kısım polimerin sentezleneceği monomerin tasarımının amaca uygun yapılıp, daha sonra da polimerleşmenin gerçekleştirilmesidir Bugüne kadar monomer tasarımı için biçok yöntem denenmiş, ancak bunların içerisinde en etkin şekilde sonuç veren yöntemin Elektron Sunucu-Elektron Alıcı- Elektron Sunucu (S-A-S) yöntem olduğu görülmüştür. Bu yöntemde, yükseltgenme potansiyeli istenen değerde olan bir elektron sunucu (S) ile indirgenme potansiyeli istenen değerde olan bir elektron alıcı (A) birleştirilerek monomer yapısı tasarlanır. Burada amaç, uygun S ve A grupları seçilerek mümkün olduğunca LUMO (En Düşük Enerjili Boş Molekül Orbitali) seviyesini aşağıya indirip, HOMO (En Yüksek Enerjili Dolu Molekül Orbitali) seviyesini de yukarıya çıkartarak polimerin bant aralığını düşürmektir. Bu çalışmada da S-A-S yöntemi monomer tasarımı için kullanılmıştır. 6,7-difenil-[1,2,5]tiyadiazolo[3,4-g]kinoksalin grubunun A, furanın ise S olarak yer aldığı yeni bir monomer (2) ve bunun polimeri (P2) sentezlenmiştir. 2 monomerinin EDOT ile kopolimerizasyonundan P(2-ko-EDOT) kopolimeri sentezlenmiştir. P2 ve P(2-ko-EDOT)’un bant aralıklarının (0,85 eV P2 için ve 1,1 eV P(2-ko-EDOT) için) oldukça düşük olduğu ve elektrokromik özellik gösterdikleri görülmüştür. P(2-ko-EDOT) kopolimerinin elektrokromik özellikleri değerlendirildiğinde özellikle kamuflaj uygulamaları için uygun bir malzeme olacağı düşünülmektedir.
Facile and Rapid Synthesis of Microwave Assisted Pd Nanoparticles as Non-Enzymatic Hydrogen Peroxide Sensor
(Esg, 2017) Sahin, Ozlem; Kivrak, Hilal; Kivrak, Arif; Kazici, Hilal Celik; Alal, Orhan; Atbas, Dilan
Carbon supported Pd catalyst was prepared with microwave-assisted polyol method (M-Pd@C) and investigated sensing activity for non-enzymatic hydrogen peroxide (H2O2). Moreover, M-Pd@C and Pd@C catalyst which synthesized via polyol method (P-Pd@C) were compared to each other in terms of electrocatalytic activity. X-ray diffraction (XRD), X-ray photo electron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate structural and morphological properties of these catalysts. Furthermore, electrochemical measurements were performed via cyclic voltammetry (CV), chronoamperometry (CA) techniques. CV results exhibited that M-Pd/C catalyst showed perfect electrocatalytic activity in terms of reduction of H2O2. M-Pd/C catalyst showed a fast response of less than 7 s with a linear range of 5.0x10(-3)-11.0 mM and a relatively low detection limit of 1.2 mu M amperometric response. M-Pd/C catalyst exhibited great selectivity for detecting H2O2 in the existence of several hindering species such as uric acid and ascorbic acid.
Facile and Rapid Synthesis of Microwave Assisted Pd Nanoparticles as Non-Enzymatic Hydrogen Peroxide Sensor (Vol 12, Pg 762, 2017)
(Esg, 2018) Sahin, Ozlem; Kivrak, Hilal; Kivrak, Arif; Kazici, Hilal Celik; Alal, Orhan; Atbas, Dilan