Article
Materials Science, Multidisciplinary
Benjamin Grant, Yuriy Bandera, Stephen H. Foulger, Jarmila Vilcakova, Petr Saha, Jiri Pfleger
Summary: A non-volatile conjugated polymer-based electrochemical memristor with neuromorphic properties was successfully fabricated using roll-to-roll printing. The device demonstrated the feasibility of implementing mathematical operations and logic gates on a single memristor, paving the way for printable artificial neural networks.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Ulrika Boda, Ioannis Petsagkourakis, Valerio Beni, Peter Andersson Ersman, Klas Tybrandt
Summary: The challenge of high-performance fully printed stretchable OECTs is addressed by developing fully screen-printed stretchable OECTs. Three stretchable functional screen-printing inks are developed, enabling the fabrication of OECTs. The stretchable OECTs show good characteristics and can withstand high strains. An electrochromic smart pixel is demonstrated by connecting a stretchable OECT to a stretchable electrochromic display. The development of screen-printed stretchable electrochemical devices, particularly OECTs, is believed to pave the way for their use in wearable applications and commercial products.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Wendong Liu, Zhihui Lei, Wenkui Xing, Jiacheng Xiong, Yingyue Zhang, Peng Tao, Wen Shang, Benwei Fu, Chengyi Song, Tao Deng
Summary: In this paper, multiresponsive actuators based on asymmetric design of graphene-conjugated poly(3,4-ethylene dioxythiophene): poly(styrenesulfonate)(PEDOT:PSS) gradient films have been developed using a simple drop casting method. These graphene-based actuators exhibit reversible bending behavior under multiple stimuli and have demonstrated potential applications in flexible electronics and energy harvesting/storage devices, as well as soft robotics, artificial muscles, wearable electronics, and smart sensors.
Article
Computer Science, Information Systems
Ayatallah M. Khalaf, Hanady Hussien Issa, Jose Luis Ramirez, Shaimaa Ali Mohamed
Summary: This paper presents a simple and cost-effective fully inkjet-printed flexible temperature sensor, which utilizes Poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) as a temperature-sensitive layer and silver nanoparticles as a contact electrode. The sensor was tested on different substrates, and the results showed that the sensor developed on glossy paper exhibited the highest sensitivity in the chosen temperature range.
Article
Chemistry, Multidisciplinary
Sujitkumar Bontapalle, Myeonghyeon Na, Haechan Park, Kyoseung Sim
Summary: The study introduces fully soft OECTs with soft components and a PEDOT:PSS-based soft channel, showcasing significant mechanical and electrical properties. Moreover, the skin-mountable amplifier demonstrated suggests the strong potential for innovative development in wearable electronics.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Marzieh Zabihipour, Deyu Tu, Jan Strandberg, Magnus Berggren, Isak Engquist, Peter Andersson Ersman
Summary: This study investigates the design and performance characteristics of inverters in low-voltage operating organic electronic circuits based on organic electrochemical transistors. By exploring different circuits, the authors found that key performance parameters of the inverter can be optimized according to application needs, enabling it to operate normally even at input voltage levels as low as 0V to 1V.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Analytical
Martina Serafini, Federica Mariani, Isacco Gualandi, Francesco Decataldo, Luca Possanzini, Marta Tessarolo, Beatrice Fraboni, Domenica Tonelli, Erika Scavetta
Summary: This study developed a wearable gas sensor for NH3 detection, utilizing specialized materials and technologies to ensure high performance and reliability. The sensor showed stability under mechanical deformations and could wirelessly connect to a smartphone, indicating promising applications in various fields.
Article
Multidisciplinary Sciences
Van Chinh Tran, Gabriella G. Mastantuoni, Marzieh Zabihipour, Lengwan Li, Lars Berglund, Magnus Berggren, Qi Zhou, Isak Engquist
Summary: The discovery of mass transport in plants has led to the development of low-cost and sustainable wood-based electronics. In this study, a wood electrochemical transistor (WECT) was created using conductive wood (CW) for all three electrodes, prepared through a two-step process. The modified wood exhibited high electrical conductivity due to the incorporation of PEDOT:PSS microstructures. The WECT showed promising performance for electrical current modulation and demonstrated potential for bio-based electronic devices.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Multidisciplinary
Poppy Oldroyd, Johannes Gurke, George G. Malliaras
Summary: This study examines the stability of thin film electrodes and finds that the PEDOT:PSS coating can slow down the corrosion of Au electrodes. Pristine PEDOT:PSS electrodes show the highest stability, which is promising for long-term in vivo neuromodulation applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Marzieh Zabihipour, Deyu Tu, Robert Forchheimer, Jan Strandberg, Magnus Berggren, Isak Engquist, Peter Andersson Ersman
Summary: Logic inverters based on poly(3,4-ethylenedioxythiophene):polystyrene sulfonate-based OECTs are designed to achieve high voltage gains, enlarged output voltage windows, and tunable switching points. These inverters are constructed using multiple screen-printed OECTs and a resistor ladder structure, with one OECT as the driving transistor and one or two additional OECTs as variable resistors.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Polymer Science
Francesco Decataldo, Filippo Bonafe, Federica Mariani, Martina Serafini, Marta Tessarolo, Isacco Gualandi, Erika Scavetta, Beatrice Fraboni
Summary: Oxygen depletion in confined spaces is a serious danger for workers, and hydrogel-based organic electrochemical transistors (OECTs) can serve as wearable and real-time oxygen gas sensors for work safety applications. These sensors have fast response, high sensitivity, and low power consumption, making them suitable for operators working in potentially hazardous confined spaces.
Article
Materials Science, Multidisciplinary
Mohammad Nazeri, Milad Ghalamboran, Gerd Grau
Summary: This article demonstrates the use of laser-induced graphene (LIG) electrodes in the fabrication of organic electrochemical transistors (OECTs). The conversion of polyimide (PI) substrate into LIG allows for the quick and low-cost creation of source, drain, and gate electrodes. The LIG electrodes with low contact resistance and good electrical stability significantly contribute to the device performance.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Anand Dev Ranjan, Rakesh Sen, Rahul Vaippully, Sumeet Kumar, Soumya Dutta, Basudev Roy, Goutam Dev Mukherjee, Soumyajit Roy, Ayan Banerjee
Summary: The engineering of interfaces is crucial in determining the fundamental properties of matter, and microbubble lithography (MBL) is a method that enables interface engineering. By using MBL to create patterned interfaces of a polymer, the conductivity of the polymer can be greatly enhanced, especially on a flexible PDMS substrate.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Biochemistry & Molecular Biology
Shuya Xue, Min Shi, Jinye Wang, Jiapeng Li, Guanwei Peng, Jingkun Xu, Yansha Gao, Xuemin Duan, Limin Lu
Summary: In this study, a TiO2-MXene/poly (3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PE-DOT:PSS) composite was used as an electrode material for the sensitive electrochemical detection of baicalein. The in-situ growth of TiO2 nanoparticles on the surface of MXene nanosheets prevented aggregation and resulted in a large specific surface area. The addition of PEDOT:PSS films improved the conductivity, dispersion, stability, and electrocatalytic activity of TiO2-MXene, leading to excellent electrochemical sensing ability for baicalein determination.
Article
Chemistry, Analytical
Jiabao Zuo, Yuliang Shen, Luyao Wang, Qi Yang, Zheng Cao, Haiou Song, Zhiwen Ye, Shupeng Zhang
Summary: A new electrochemical sensor based on Cu-CuO@MoOx-modified polyethylene terephthalate electrode was developed for simultaneous determination of catechol and hydroquinone. The sensor showed a low detection limit and exhibited strong anti-interference ability, good repeatability, and long-term stability. The flexible property of the electrode holds promise for wearable electrochemical sensors.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Endale Teju, Bezuayehu Tadesse, Negussie Megersa
Summary: A salting out-assisted liquid-liquid extraction coupled with high-performance liquid chromatography method was developed for the selective extraction and preconcentration of five s-triazine herbicides and three major metabolites of atrazine simultaneously. The method showed good detection and quantification limits, linearity ranges, relative standard deviations, and relative recoveries for the analyzed water samples from different sources.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Miresa Tadese, Meseret Amde, Bayissa Leta Danno, Lemessa Benti, Negussie Megersa
Summary: In this study, a dispersive micro-solid-phase extraction (D-mu-SPE) technique was developed for the analysis of trace amounts of lead and cadmium in waters. A magnetized and sulphide functionalised zinc oxide nanocomposite (Fe3O4/ZnO@S NC) was synthesised and characterised. Experimental parameters were optimised and good preconcentration factor, limit of detection and recovery values were obtained. The precision of the method was also evaluated. The developed D-mu-SPE method was successfully applied for the determination of lead and cadmium in different real-world water samples.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Teshome Tolcha, Tura Gemechu, Said Al-Hamimi, Negussie Megersa, Charlotta Turner
Summary: A method using supercritical carbon dioxide and acetonitrile for extraction was developed for trace analysis of pesticides in honey samples, showing good linearity and low detection limits. This method is promising for pesticide analysis in complex food samples.
JOURNAL OF SEPARATION SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Teshome Tolcha, Kefyalew Gomoro, Negussie Megersa
Summary: A modified SALLE combined with LD-DLLME method was developed for quantitative determination of multiclass pesticide residues in sugar and soil samples. The method showed a broad linear range, low limits of detection, and good recovery rates.
BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
(2021)
Article
Microbiology
Afrasa Mulatu, Tesfaye Alemu, Negussie Megersa, Ramesh R. Vetukuri
Summary: By optimizing culture conditions using a mathematical model, economical and high mass production of novel Trichoderma species under solid-state fermentation was achieved. The mixture of wheat bran and white rice showed maximum growth support for T. asperellum AU131 and T. longibrachiatum AU158, with significant growth factors being temperature, moisture content, inoculum concentration, and incubation period. Additionally, the regression model showed high significance with maximum conidia yield obtained under optimal conditions. Conidial viability of Trichoderma species formulations could be maintained at room temperature for eight months.
Article
Environmental Sciences
Asnake Tesfaye, Meseret Amde, Endale Teju, Deribachew Bekana, Negussie Megersa
Summary: A simple solid-phase extraction procedure was developed for fast extraction and preconcentration of Cu(II) and Cr(III) from waters. The method showed an enrichment factor of 40 and recoveries of over 95% under optimized conditions, with limits of detection in the low μg L-1 range. This technique demonstrated good intra-day and inter-day precision for trace determination of the analytes in real water samples.
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Aynalem Lakew, Teshome Assefa, Meseret Woldeyohannes, Negussie Megersa, Bhagwan Singh Chandravanshi
Summary: In this study, a sensitive and reliable liquid chromatography with UV detection method was developed for the simultaneous determination of seven multiclass antibiotic residues in chicken tissues. The method showed good linearity, precision, sensitivity, accuracy, and robustness. It is the first instance of simultaneous determination of seven multiclass, multi-residues analysis using LC-UV from chicken tissue samples.
Article
Chemistry, Analytical
Aynalem Lakew, Negussie Megersa, Bhagwan Singh Chandravanshi
Summary: The salting-out assisted liquid-liquid extraction method combined with liquid chromatography ultraviolet-visible detector has been developed and validated for the simultaneous determination of seven antibiotic compounds in cow milk samples. The method is simple, fast, and exhibits excellent performance in terms of extraction efficiency and analysis results.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Aynalem Lakew, Negussie Megersa, Bhagwan Singh Chandravanshi
Summary: A simple analytical method was developed for the extraction and determination of three beta-lactam antibiotics in chicken tissues and feather samples, showing good sensitivity and selectivity, suitable for various matrices of differing origins.
BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
(2022)
Article
Multidisciplinary Sciences
Afrasa Mulatu, Negussie Megersa, Teshome Tolcha, Tesfaye Alemu, Ramesh R. Vetukuri
Summary: This study investigated the antagonistic potential of Trichoderma species against Fusarium xylarioides and the associated mechanisms, as well as their toxicity in Swiss albino mice. The results showed that the methanolic extracts from T. asperellum AU131 and T. longibrachiatum AU158 had effective inhibitory effects on Fusarium xylarioides. Gas chromatography-mass spectrometry analysis identified various volatile organic metabolites in the extracts. In vivo toxicity evaluation in mice showed no significant signs of toxicity or changes in body weight. Overall, the tested Trichoderma species were found to be safe and non-pathogenic for use as biofungicides.
Article
Chemistry, Analytical
Aynalem Lakew, Negussie Megersa, Bhagwan S. Chandravanshi
Summary: A new simple RP-HPLC method was developed to estimate the depletion of amoxicillin residues caused by different cooking methods in broiler chicken tissue. The study found that temperature and time have a significant effect on the depletion of amoxicillin residues.
INTERNATIONAL JOURNAL OF ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Habtamu Bekele, Negussie Megersa
Summary: Graphene oxide (GO) was used in dispersive solid phase extraction (DSPE) for extracting triazine herbicides from water samples. The GO formed dispersed colloids with functional groups that interacted with organic compounds containing oxygen and nitrogen functional groups. A salt-assisted (SA)-GO-DSPE method was developed for efficient extraction. The method showed low detection limits, good extraction recoveries, and high precision. The method is environmentally friendly and promising for trace analysis of pesticides in water samples.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Habtamu Bekele, Negussie Megersa
Summary: This study developed a simple and fast analytical technique using dispersive liquid-liquid microextraction and high performance liquid chromatography for quantification of pesticide contaminants in fruit juice samples. Various experimental parameters were optimized, and the method was validated with satisfactory results in terms of accuracy, precision, and linearity. The method successfully identified and quantified pesticide residues in fruit juice samples.
SEPARATION SCIENCE PLUS
(2023)
Article
Chemistry, Analytical
Habtamu Bekele, Weldegebriel Yohannes, Negussie Megersa
Summary: A simple, inexpensive, selective, and fast salting-out assisted liquid-liquid extraction (SALLE) technique coupled with HPLC-DAD was developed for the extraction and analysis of multiclass pesticide residues in milk samples. The technique showed good sensitivity and precision, with reliable limits of detection and quantification. However, the target analytes were not detected in all samples.
INTERNATIONAL JOURNAL OF ANALYTICAL CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Aynalem Lakew, Negussie Megersa, Bhagwan Singh Chandravanshi
Summary: A modified rapid, simple, and safe extraction method (QuEChERS) was developed for the simultaneous extraction and purification of antibiotic residues in vegetables using liquid chromatography UV detector. The method was validated for linearity, sensitivity, accuracy, and reproducibility, showing good results. This simple QuEChERS extraction method can be used for the investigation of multi-residue drugs in vegetables.
