Article
Chemistry, Analytical
Elena Alina Chiticaru, Celina Maria Damian, Luisa Pilan, Mariana Ionita
Summary: This study proposes a simple, label-free, and cost-effective DNA detection platform using screen-printed carbon electrodes modified with reduced graphene oxide and gold nanoparticles. The preparation process and electrochemical properties of the modified electrodes were characterized and confirmed. The introduction of gold nanoparticles onto the electrode surface enhanced surface conductivity and sensitivity in detection.
Article
Agriculture, Multidisciplinary
Yuhong Wang, Yulong Bi, Rongrong Wang, Lu Wang, Hao Qu, Lei Zheng
Summary: A novel As(III) electrochemical sensor based on a solution-gated graphene transistor platform has been developed in this study, showing significantly improved selectivity and sensitivity. The sensor can detect As(III) in practical rice samples with high recovery rate, indicating great potential for heavy metal detection in various food samples.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2021)
Article
Chemistry, Physical
Meltem Dinleyici, Basma Al-Khateeb, Arwa Abourajab, Duygu Uzun, Sermet Koyuncu, Huriye Icil
Summary: The newly designed compound exhibits favorable characteristics in absorption, electrochemical, spectroelectrochemical, and morphological properties, with computational studies confirming its structural and electrochemical features.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Chemistry, Physical
Yiqing Wang, Fabian Grote, Qing Cao, Siegfried Eigler
Summary: The study found that introducing oxygen functional groups near defects in graphene can significantly enhance its activity and selectivity in hydrogen peroxide production. After adding oxo-groups near these defect sites, the selectivity of H2O2 increased to over 84%, and the half-wave potential was more positive than initial oxo-functionalized graphene.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Min Ji Kim, Diana J. Wang, Karina Targos, Uriel A. Garcia, Alison F. Harris, Ilia A. Guzei, Zachary K. Wickens
Summary: We have developed a new method for the synthesis of cyclopropanes using abundant carbon pronucleophiles and unactivated alkenes. This scalable protocol exhibits high diastereoselectivity and tolerates diverse functional groups on both coupling partners.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Analytical
Hamideh Imanzadeh, Nurgul K. Bakirhan, Filiz Kuralay, Mandana Amiri, Sibel A. Ozkan
Summary: Graphene, a two-dimensional material with unique physical and electrochemical properties, has been utilized in the construction of sensitive and stable electrochemical sensors. Its applications in electrochemical drug assays and anticancer drug research have shown promising prospects in pharmaceutical and biological fields.
CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mikhail Vagin, Ivan G. Ivanov, Rositsa Yakimova, Ivan Shtepliuk
Summary: The climate change caused by human activities has led to research on new energy resources, with hydrogen attracting interest as a high-energy-density green carrier. This study investigated the bidirectional electrocatalysis of the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) on metal- and defect-free epigraphene (EG) grown on 4H silicon carbide (4HSiC). The results demonstrated the stability and reactivity of EG in the presence of acid and alkaline media, providing insights into the dominant pathway of HER and the role of the underlying substrate.
Article
Chemistry, Applied
Chelo Ferreira, Maria-Pilar Saenz-Navajas, Vanesa Carrascon, Tormod Naes, Purificacion Fernandez-Zurbano, Vicente Ferreira
Summary: This study successfully predicted the chemical composition and oxygen consumption rate of red wines by using linear sweep voltammetry with disposable carbon paste electrodes, providing a fast, cheap and easy-to-use method for rapid wine chemical characterization.
Article
Chemistry, Multidisciplinary
Parag P. Chavan, Vijay S. Sapner, Bhaskar R. Sathe
Summary: This study demonstrates the electrochemical oxidation of nitrite using a metal-free, highly stable, and selective biomolecule - tyramine functionalized graphene oxide (GT) as an electrocatalyst. The successful functionalization of biomolecule on graphene was achieved through a simple chemical method, and the surface features were characterized using various spectroscopic and microscopic techniques. The biomolecule functionalized graphene oxide showed enhanced electrochemical activity and stability for nitrite oxidation, highlighting its potential as an effective electrocatalyst for environmental remediation.
Article
Chemistry, Analytical
Xia Qiu, Qingshan Dai, Haoran Tang, Yongxin Li
Summary: This research developed a method to simultaneously detect miRNA-21 and Let-7a in a single experiment by utilizing the distinguishability of two types of current signals. The immobilization of ssDNA1 complementary to miRNA-21 on Pt nanoparticles and ssDNA2 complementary to Let-7a on Ag nanoparticles inhibited the respective current transients. The addition of miRNA-21 and Let-7a disrupted the weak DNA-nanoparticle interaction and restored the catalytic activities, enabling the quantification of the target miRNAs based on the frequency of the recovered current signals.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Zhipeng Qiu, Zheng Liu, Guanwen Wang, Chao Huangfu, Zhiyuan Li, Yingchun Yan, Chunlei Chi, Pengfei Gao, Xiaolong Lu, Su Zhang, Tong Wei, Zhuangjun Fan
Summary: Organic electrodes have emerged as promising candidates for supercapacitors due to their sustainability, structural diversity, and high electrochemical activity. However, their poor electronic conductivity and solubility in electrolytes limit their applications. Therefore, a facile and effective strategy for synthesizing pyrogallic (PG) oligomer confined in-between graphene layers (FRGO) is proposed. The FRGO exhibits excellent rate performance and ultra-long cycle stability, making it a potential material for energy storage and conversion.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Martin Linden, Silja Hofmann, Antonia Herman, Nicole Ehler, Robin M. M. Baer, Siegfried R. R. Waldvogel
Summary: This study presents the first electrochemical approach for the direct synthesis of pyrazolines and pyrazoles from easily accessible hydrazones and dipolarophiles. The method allows for large-scale production and even conversion of highly sensitive alkenes. The use of a biphasic system with sodium iodide as a supporting electrolyte and mediator is cost-effective. Mechanistic insight is provided by the isolation of key intermediates, and the synthesis of a commercial herbicide safener further highlights the significance of this reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Analytical
Reda Elshafey, Ghada Fathey Abo-Sobehy, Abd-Elgawad Radi
Summary: A nanocomposite of graphene oxide and graphene quantum dots was utilized to detect ds-DNA-dimethoate interaction and fabricate DNA biosensors. The modified electrodes were characterized by microscopic and electrochemical methods to confirm the mechanism of DMT oxidation on the platform.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Jianan Li, Jili Li, Tao Liu, Lin Chen, Yefei Li, Hualin Wang, Xiurong Chen, Ming Gong, Zhi-Pan Liu, Xuejing Yang
Summary: Urea electrolysis is a promising technology for simultaneous H-2 production and nitrogen suppression in water energy production. However, prevalent nickel-based catalysts may over-oxidize urea into NO2- products, posing potential environmental hazards. Through experiments and calculations, a nitrogen-fate network was derived, leading to the development of a polyaniline-coating strategy to increase N-2 production. These findings offer insights into nitrogen fate in water-energy systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Jana Klein, Siegfried R. R. Waldvogel
Summary: A sustainable electrochemical pathway for the degradation and thermal treatment of technical lignosulfonate is proposed. This method allows for the production of significant quantities of low molecular weight compounds, including vanillin and acetovanillone. The electrochemical degradation is carried out using a simple two-electrode setup in aqueous media, which can be easily scaled up. The biopolymer is oxidized at the anode, while hydrogen is evolved at the cathode. Subsequent thermal treatment further degrades the robust chemical structure of lignosulfonates. Under optimized electrolytic conditions, vanillin can be obtained in a yield of 9.7 wt% relative to the dry mass of lignosulfonate used. By-products such as acetovanillone or vanillic acid are also observed but in lower yields. Overall, this study establishes a new and reliable one-pot, two-step degradation process for various technically relevant lignosulfonates, offering the advantage of using electrons as an oxidizing agent and resulting in minimal reagent waste.
Article
Nanoscience & Nanotechnology
Su-Jin Song, Carmen C. Mayorga-Martinez, Jan Vyskocil, Marketa Castoralova, Tomas Ruml, Martin Pumera
Summary: Magnetotactic bacteria can be precisely controlled by applying a magnetic field, allowing them to remove organic phosphate pesticides from aqueous solutions by binding with organic matter. These bacteria exhibit swarm behavior and can move in a circular direction under a programmed magnetic field. This technology shows potential for pollution removal and retrieval in various environments through directional magnetic actuation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Carmen C. C. Mayorga-Martinez, Marketa Castoralova, Jaroslav Zelenka, Tomas Ruml, Martin Pumera
Summary: In this study, a method based on magnetic microrobots was developed for rapid isolation and identification of Staphylococcus aureus bacteria in milk. The method does not produce harmful compounds for the milk microbiota and can be efficiently applied in food production.
Article
Chemistry, Multidisciplinary
Martina Ussia, Mario Urso, Monika Kratochvilova, Jiri Navratil, Jan Balvan, Carmen C. C. Mayorga-Martinez, Jan Vyskocil, Michal Masarik, Martin Pumera
Summary: This study reports a new biodegradable magnetically actuated zinc/cystine-based microrobots for in situ treatment of prostate cancer cells. The microrobots are fabricated through metal-ion-mediated self-assembly of cystine encapsulating superparamagnetic Fe3O4 nanoparticles, allowing precise manipulation by a rotating magnetic field. Inside the cells, the enzymatic reducing environment promotes the disassembly of the cystine structure and disrupts non-covalent interactions with metal ions, enabling site-specific delivery of zinc ions for tumor cell killing via a Trojan horse effect.
Article
Multidisciplinary Sciences
Jayraj V. Vaghasiya, Carmen C. Mayorga-Martinez, Jan Vyskocil, Martin Pumera
Summary: The authors developed a black phosphorous-based tactile sensor array system that provides touch sensing and audio feedback. This assistive technology is utilized by visually or speech-disabled individuals to communicate using audio as a platform. The piezoresistive tactile sensor based on a black phosphorous and polyaniline composite showed excellent sensitivity, low-pressure sensitivity, reasonable response time, and good cycle stability. A prototype device using six of these tactile sensors was able to convert pressed text into audio to assist visually or speech-disabled persons.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Roberto Maria-Hormigos, Carmen C. Mayorga-Martinez, Tomas Kincl, Martin Pumera
Summary: The brewing industry is projected to generate a revenue exceeding 500 billion euros in 2022, with an expected annual growth. This study demonstrates the use of magneto/catalytic nanostructured BioBots, encapsulating yeast cells, for enhanced beer fermentation. The encapsulated yeast cells retain their biological activity and the catalytic fermentation process produces oscillatory motion of the BioBots, improving the fermentation compared to static yeast cells. Magnetic actuation is then utilized to retrieve the BioBots from the beer samples, eliminating the need for additional filtration steps.
Article
Chemistry, Multidisciplinary
Carmen C. Mayorga-Martinez, Jaroslav Zelenka, Karel Klima, Michaela Kubanova, Tomas Ruml, Martin Pumera
Summary: Modern micro/nanorobots have versatile capabilities for biomedical and environmental tasks. Magnetic microrobots are particularly promising for biomedical applications, as they can be fully controlled by a rotating magnetic field without the use of toxic fuels. These microrobots can also form swarms to perform tasks at a larger scale.
ADVANCED MATERIALS
(2023)
Article
Engineering, Chemical
Xia Peng, Mario Urso, Martin Pumera
Summary: Mass transfer plays a crucial role in heterogeneous reactions. Micro/nanomachines, as a promising technology for environmental applications, can greatly improve the performance of purification treatments due to their active motion ability and enhanced diffusion. In this study, we developed Pt-free single-component light-powered WO3 micromotors with enhanced diffusion and effective degradation capability for nitroaromatic contaminants in water.
Article
Engineering, Environmental
Keval K. Sonigara, Jayra V. Vaghasiya, Carmen C. Mayorga-Martinez, Martin Pumera
Summary: The development of self-powered biosensor technologies requires flexible and robust energy storage devices. In this study, a hybrid self-powered biosensor system using a zinc-ion supercapacitor (ZISC) wearable patch was developed. The patch integrated a two-dimensional NiPS3 electrode, which showed good electrochemical performance. The ZISC demonstrated stable energy storage performance and mechanical flexibility, making it suitable for powering health monitoring devices.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Paula Mayorga-Burrezo, Carmen C. Mayorga-Martinez, Martin Pumera
Summary: Micromachines have been functionalized with magnetic components to achieve efficient magnetic microrobots with photodegradation activity for environmental pollutant decomposition. The influence of photocatalyst on the micromotors' trajectory in conjunction with magnetic motion was investigated. The light-induced reactive oxygen species (ROS) power the microrobots and have a strong influence on magnetic trajectories, resulting in an unexpected alteration of their motion direction. These dual magnetic/photocatalytic microrobots showed great potential for catalytic applications in various fields.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Keval K. Sonigara, Jayraj V. Vaghasiya, Carmen C. Mayorga-Martinez, Martin Pumera
Summary: Flexible aqueous zinc-ion batteries with a Ti3C2Tx decorated sulfur cathode and iodine-added amphiphilic gel electrolyte show high storage capacity, good cycling stability, and excellent mechanical stability. They can power various electronic gadgets and offer promising potential for flexible energy storage technologies.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Anna Jancik-Prochazkova, Martin Pumera
Summary: Microrobots, made from phoretic Sb2S3 material, demonstrated swarming behavior under light illumination without the need for chemical fuel. These environmentally friendly microrobots were prepared by reacting precursors with bio-originated templates in an aqueous solution in a microwave reactor. The photocatalytic abilities of the microrobots were showcased by degrading industrially used dyes, quinoline yellow and tartrazine, in the on-the-fly mode. This proof-of-concept work highlights the suitability of Sb2S3 photoactive material for designing swarming microrobots for environmental remediation applications.
Article
Engineering, Electrical & Electronic
Stefan Wert, Christian Iffelsberger, Akshay Kumar K. Padinjareveetil, Martin Pumera
Summary: Transition metal trichalcogenphosphites (MPX3), a type of 2D material, show potential as electrocatalysts for the hydrogen evolution reaction (HER). Through studying the local electrochemical and electrocatalytic activity of FePSe3, we found that electrochemical processes and the HER occur at an increased rate at edge-like defects of FePSe3 crystals. These findings have important implications for the application of these materials in electrochemistry and for understanding the electrochemical performance of layered compounds.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jyoti, Jose Munoz, Martin Pumera
Summary: Graphene quantum dot-based microrobots demonstrate potential for optical real-time monitoring of DNA, offering high sensitivity and selectivity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Radhika Nittoor Veedu, Siowwoon Ng, Michela Sanna, Martin Pumera
Summary: 3D printing technology allows for the creation of 3D electrodes, however, printed devices lack certain properties. To improve the photoelectrochemical properties of these electrodes, functionalized 2D germananes can be beneficial and the enhancement of photoelectrocatalytic performance extending with applications beyond water splitting.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Physical
Siowwoon Ng, Michela Sanna, Edurne Redondo, Martin Pumera
Summary: Three-dimensional (3D) printing is a popular technique for producing customized parts, and 3D carbon electrodes have great potential in electrochemical applications. Atomic layer deposition (ALD) can create functional coatings on 3D carbon electrodes, enhancing their performance in light-driven water splitting hydrogen and oxygen evolution reactions.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
