Article
Multidisciplinary Sciences
Mazin A. Zamzami, Gulam Rabbani, Abrar Ahmad, Ahmad A. Basalah, Wesam H. Al-Sabban, Saeyoung Nate Ahn, Hani Choudhry
Summary: In this work, the fabrication and characterization of a carbon nanotube field-effect transistor (CNT-FET) sensor were reported. CNTs were used as the sensing layer between the source-drain electrodes. The CNT-FETs were fabricated using conventional photolithography and lift-off techniques. The structural morphology of the deposited CNT was confirmed through scanning electron microscopy (SEM) imaging. The transfer curves and the characteristics of the source-drain current (IDS) versus gate voltage (VGS) were analyzed to evaluate the performance of the fabricated CNT-FET devices. The results showed that CNT-FET-based sensors have the advantages of low cost fabrication, quick response, increased sensitivity, small size, and high flexibility, making them suitable for a wide range of biosensing applications.
JOURNAL OF KING SAUD UNIVERSITY SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Tapan Sarkar, Sira Srinives
Summary: In this study, single-walled carbon nanotubes were functionalized with porphyrin electrochemically to fabricate a chemical field-effect transistor for detecting BTEX vapor. The functionalization process significantly enhanced the sensing response for analytes, with a sub-ppm limit of detection. The study showed that the sensing mechanism is dominated by the electrostatic gating effect through systematic field effect transistor measurements.
MICROELECTRONIC ENGINEERING
(2021)
Article
Chemistry, Analytical
QingYi Meng, Shuhua Wei, Zhiyuan Xu, Qiang Cao, Yushi Xiao, Na Liu, Huan Liu, Gang Han, Jing Zhang, Jiang Yan, Alexander P. Palov, Lidong Wu
Summary: This study improved the performance of SWCNT-FET sensors by introducing P4VP and HfO2, resulting in a high sensitivity and low detection limit for Cu2+, making it a promising choice for the future manufacturing of custom sensors.
ANALYTICA CHIMICA ACTA
(2021)
Article
Nanoscience & Nanotechnology
Wenting Shao, Michael R. Shurin, Sarah E. Wheeler, Xiaoyun He, Alexander Star
Summary: This study demonstrates the use of a high-purity semiconducting single-walled carbon nanotube field-effect transistor for rapid detection of SARS-CoV-2 antigens, displaying high sensitivity and specificity.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Iskandar Yahya, Muhamad Azuddin Hassan, Nur Nasyifa Mohd Maidin, Mohd Ambri Mohamed
Summary: A thin film of single-walled carbon nanotube network FET was successfully fabricated using a simple deposition method, allowing for the detection of human serum albumin in biosensor applications. By utilizing a covalent interaction, the film served as a transducer to detect HSA with high sensitivity and a low detection limit, while also demonstrating the ability to quantify HSA in a complex biological environment even in the presence of interference from other biomolecules.
Review
Energy & Fuels
Jin-Myung Choi, Jiye Han, Tushar Rane, Soyeon Kim, Ick Soo Kim, Il Jeon
Summary: This review discusses the fundamentals of utilizing SWCNTs in PSCs, including their characteristics as electron-transporting layer, hole-transporting layer, photoactive layer, and interfacial materials. It also presents strategies to improve PSCs performance through defect control and enhancement of electrical and morphological properties.
JOURNAL OF PHYSICS-ENERGY
(2022)
Review
Chemistry, Multidisciplinary
Jianping Zou, Qing Zhang
Summary: Single-walled carbon nanotubes (SWCNTs) are considered a promising electronic material for the future of electronics, with sub-10 nm SWCNT-field effect transistors (FETs) outperforming Si-based FETs. Recent advances in SWCNT electronics focus on fundamental electronic structures, carrier transport mechanisms, and metal/SWCNT contact properties, highlighting subthreshold switching properties for low-power device operations. Challenges and prospects for future SWCNT-based electronics include material preparation, device fabrication, and large-scale ICs integration.
Article
Biochemical Research Methods
Fuchun Si, Zenghui Liu, Jinge Li, Huaixia Yang, Yanju Liu, Jinming Kong
Summary: An electrochemical detection strategy for exosomes was established based on DNA/ferrocene-modified single-walled carbon nanotube complex. The method showed high sensitivity and good selectivity, providing a potential platform for early diagnosis and biomedical applications.
ANALYTICAL BIOCHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Alejandro J. Cruz-Arzon, Kelotchi S. Figueroa, Nicholas J. Pinto, Zhang Qicheng, Christopher Kehayias, Suh Yeonjoon, A. T. Charlie Johnson
Summary: P-doped single-walled carbon nanotubes deposited at the edge of a cleaved n-Si/SiO2 wafer form a p-n junction that shows reversible charge carrier switching from holes to electrons under UV irradiation. Annealing in air at 70 degrees C resets the diode to its initial operating condition, making it reusable. The diode also demonstrates potential for UV radiation sensing and provides a platform for studying UV-induced charge dynamics at the SWCNT/n-Si interface.
Article
Chemistry, Analytical
Junqing Wei, Zhihan Zhao, Kuibo Lan, Zhi Wang, Guoxuan Qin, Ruibing Chen
Summary: This study demonstrated the successful detection of multiple proteins in single cells using MoS2-FETs, showing its potential application in complex biological samples with cost-efficient and user-friendly characteristics for biological studies and clinical diagnosis.
Article
Chemistry, Multidisciplinary
Adi Hendler-Neumark, Verena Wulf, Gili Bisker
Summary: MicroRNAs (miRNAs) play important roles in cellular and biological processes. This study demonstrates a selection process for miRNA biomarkers using fluorescent single-walled carbon nanotube (SWCNT) sensors. One selected sensor showed high specificity and selectivity towards the target sequence in serum.
Article
Chemistry, Physical
Alena A. Alekseeva, Dmitry Krasnikov, Grigoriy B. Livshits, Stepan A. Romanov, Zakhar I. Popov, Liubov A. Varlamova, Ekaterina Sukhanova, Andrei S. Klimovich, Pavel B. Sorokin, Serguei Savilov, Albert G. Nasibulin
Summary: We report a simple one-step method to selectively etch metallic single-walled carbon nanotubes (SWCNTs) in the aerosol phase. Our approach involves a tandem of two flow reactors, with the first one producing SWCNTs and the second one eliminating metallic SWCNTs. By modeling the adsorption of the oxidant (N2O) on the SWCNT surface, we found that metallic SWCNTs have lower adsorption energy than semiconducting ones. Using this method, we obtained SWCNT films enriched with semiconducting nanotubes.
Article
Chemistry, Multidisciplinary
Min-Ken Li, Adnan Riaz, Martina Wederhake, Karin Fink, Avishek Saha, Simone Dehm, Xiaowei He, Friedrich Schoeppler, Manfred M. Kappes, Han Htoon, Valentin N. Popov, Stephen K. Doom, Tobias Hertel, Frank Hennrich, Ralph Krupke
Summary: This work demonstrates that electroluminescence excitation is selective towards neutral defect-state configurations with the lowest transition energy, which, combined with gate control, leads to high spectral purity.
Article
Materials Science, Multidisciplinary
Dandan Zhang, Yipeng He, Rumin Wang, Alan Taub
Summary: In this study, the kinetics of carbon nanotube (CNT) migration in an electric field were investigated. It was found that the migration rate of CNTs is linearly proportional to the electric field strength, while the CNT concentration and length distribution have minimal effects on the migration velocity. This relationship can be used to manipulate the spatial distribution of CNTs in polymer composites to enhance their mechanical, thermal, and electrical properties.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Ping Zhang, Wenhui Yi, Lei Bai, Jinfeng Zhou, Yilong Tian, Wenyi Ren
Summary: This study successfully extracted s-SWCNTs using PCz with different average molecular weights, and found that PCz with higher molecular weight has better selective extraction ability, resulting in s-SWCNTs with higher purity and yield.
JOURNAL OF NANO RESEARCH
(2021)
Article
Chemistry, Analytical
Lukasz Fusnik, Bartlomiej Szafraniak, Jerzy Wrona, Susana Cardoso, Paulo. P. Freitas, Piotr Wisniowski
Summary: This paper investigates the dependence of sensitivity, resistance derivative, and current on bias voltage in tunneling magnetoresistance sensors. The results show that the sensitivity does not saturate up to 1 V in sensors with voltage controlled magnetic anisotropy modification and the sensitivity asymmetry changes significantly with bias polarity. Furthermore, the contribution of current and resistance derivative to sensitivity exhibits a crossover phenomenon.
Review
Chemistry, Analytical
Joao Pinto da Costa, Astrid Avellan, Catherine Mouneyrac, Armando Duarte, Teresa Rocha-Santos
Summary: Plastic additives are a group of substances used in the plastic industry for various purposes. They can assist in molding plastics, improve performance, and reduce costs. However, these additives, along with nonpolymerized monomers, can be more hazardous and pose risks to the environment and human health. This article provides an overview of the mechanistic uptake/release of these compounds, discusses the potential ecological consequences, and explores analytical methodologies for their determination. It also highlights the limitations of current literature and presents future research prospects.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Candid Reig, Maria-Dolores Cubells-Beltran, Fernando Pardo, Francisco Vegara, Jose A. Boluda, Sofia Abrunhosa, Susana Cardoso
Summary: This paper proposes a dynamic compact electrical model for bio-inspired applications of GMR based magnetic scanning sensors. The model can be directly used in most standard CMOS design platforms.
Article
Nanoscience & Nanotechnology
F. Matos, R. Macedo, P. P. Freitas, S. Cardoso
Summary: Magnetoresistive sensors, using soft magnetic free layers, are popular for small footprint magnetic field detection applications. This study explores the TMR and noise performance of in-plane MTJ sensors with magnetically saturated CoFeBTa and CoFeSiB films as free layers. The results show improved magnetoresistance of 230% in CoFeBSi with superior noise characteristics, as well as different magneto-crystalline anisotropy values compared to CoFeB/Ru/NiFe.
Article
Food Science & Technology
Margarida Faustino, Daniela Machado, Dina Rodrigues, Jose Carlos Andrade, Ana Cristina Freitas, Ana Maria Gomes
Summary: This study developed a cheese spread incorporating red seaweed Osmundea pinnatifida extract and characterized its nutritional, pH, and microbiological parameters, as well as its prebiotic, antidiabetic, antihypertensive, and antioxidant activities. The results showed that this cheese spread had stable pH, no microbial contamination, and exhibited all tested bioactivities at both 0 and 21 days. Therefore, it can be considered as an innovative food with the potential to improve the health and well-being of populations.
Review
Chemistry, Medicinal
Sergio Cruz Sousa, Ana Cristina Freitas, Ana Maria Gomes, Ana P. Carvalho
Summary: This article summarizes the technologies explored in the past five years to extract or increase extraction yields of fatty acids from Nannochloropsis microalgae. Different types of lipids and/or fatty acids are obtained depending on the extraction efficacy of the various technologies. Furthermore, the extraction efficiency may vary depending on the species of Nannochloropsis, thus a case-by-case assessment is necessary to determine the most suitable technology or customize one for recovering specific fatty acids or classes, including PUFA such as eicosapentaenoic acid.
Article
Biochemistry & Molecular Biology
Paulo Nova, Ana Pimenta-Martins, Elia Maricato, Claudia Nunes, Helena Abreu, Manuel A. Coimbra, Ana Cristina Freitas, Ana Maria Gomes
Summary: The chemical composition and antioxidant profile of five edible macroalgae were determined in this study. The tested seaweeds showed considerable amounts of proteins, carbohydrates, fats, and various minerals. The polysaccharide composition varied among the different seaweed species, with Fucus vesiculosus standing out for its high fucoidan content and strong antioxidant activity. These marine macroalgae have great potential for use in health, food, and industrial applications.
Article
Green & Sustainable Science & Technology
Veronica Godoy, Joana Correia Prata, Antonio Perez, Joao Pinto da Costa, Teresa Rocha-Santos, Armando C. Duarte
Summary: The main objective of this study was to estimate the microplastic pollution on Costa Nova sandy beach in Portugal using longitudinal and cross-sectional transects. The results showed low variability in data, with median concentrations ranging from 142 to 356 p/kg d.w. in cross-sectional transects, and from 211 to 270 p/kg d.w. in longitudinal transects. Microspheres were the predominant morphology, accounting for over 90% of all samples, and the most abundant microplastics were <200 μm in size. Despite moderate-low tourist activity, microplastic contamination was higher in Costa Nova compared to other Portuguese beaches, possibly due to nearby port activities and ocean currents. However, this study highlights the disparity in data caused by different methodologies used in analyzing similar areas.
Article
Microbiology
Ana Paco, Micael F. M. Goncalves, Joao P. da Costa, Teresa A. P. Rocha-Santos, Artur Alves
Summary: This study presents the draft genome sequence of Zalerion maritima strain ATCC 34329, a marine fungus known for its ability to biodegrade (micro)plastics. The genome was found to be 58.4 Mb in size, with a GC content of 44.39%, and it contains 10,802 predicted genes.
MICROBIOLOGY RESOURCE ANNOUNCEMENTS
(2023)
Article
Biotechnology & Applied Microbiology
Sergio Sousa, Ana P. Carvalho, Carlos A. Pinto, Renata A. Amaral, Jorge A. Saraiva, Ricardo N. Pereira, Antonio A. Vicente, Ana C. Freitas, Ana M. Gomes
Summary: To make Nannochloropsis oculata a financially viable source for commercial applications, extraction efficiency needs to be improved. This study tested emerging technologies such as high hydrostatic pressure (HHP) and moderate electric fields (MEF), along with solvents with different polarity indexes, to increase accessibility and extraction yields of eicosapentaenoic acid (EPA). The combined use of HHP and MEF resulted in a 62% increase in EPA extraction yields from wet N. oculata biomass. These findings are highly relevant for the food and pharmaceutical industries, providing alternatives to traditional extraction methods with increased yields and reduced environmental impact.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
P. D. R. Araujo, R. Macedo, E. Paz, S. Cardoso, D. C. Leitao, P. P. Freitas
Summary: Improving the thermal resilience of magnetic tunnel junctions (MTJs) enhances their usability as sensing devices and is crucial for their operation in harsh environments. This study investigates the impact of temperature on the degradation of the magnetic reference in MgO-MTJ field sensor stacks. The results demonstrate the importance of properly designing a suitable buffer layer system and understanding the complete behavior of MTJs at different temperatures to achieve the highest resilience to high temperature environments.
Article
Nanoscience & Nanotechnology
Catarina Goncalves Fonseca, Vania Silverio, David Barata, Wolfgang Giese, Holger Gerhardt, Susana Cardoso, Claudio Areias Franco
Summary: The ability of endothelial cells to respond to blood flow is crucial for the formation and maintenance of a functional vascular network. However, the molecular mechanisms underlying the response to high flow conditions are still not well understood. In this study, we developed and validated a 96-wells fluidic system for high-throughput screenings under laminar high-flow conditions. Our findings demonstrate that endothelial cells in this system align along the flow direction and upregulate KLF2 and KLF4 levels in response to fluid flow-induced shear stress. Moreover, our fluidic system allows for efficient gene knock-down compatible with automated liquid handling for high-throughput screening platforms.
MICROSYSTEMS & NANOENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Diogo Miguel Caetano, Ruben Afonso, Ana Rita Soares, Joao Silva, Hanna Iva Busse, Vania Silverio, Taimur Rabuske, Goncalo N. Tavares, Jorge Ribeiro Fernandes, Susana Cardoso
Summary: In this study, an artificial neural network (ANN) is proposed for magnetic microcytometry pattern recognition and automated counting. The method is tested for detecting analytes in the range of 2-3 μm. The cytometer consists of a disposable cartridge with microfluidic channels and magnetoresistive (MR) sensors. The ANN achieves a maximum detection rate of 90%, surpassing the detection rates of other single-sensor methods reported in the literature (30%-50%).
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Automation & Control Systems
Joao Silva, Diogo Miguel Caetano, Taimur Rabuske, Susana Cardoso, Moises Piedade, Jorge Ribeiro Fernandes
Summary: This article presents the design and implementation of a three-channel ASIC for signal acquisition in industrial positioning systems. The ASIC utilizes magnetic encoder scales and tunnel magneto-resistance (TMR) sensors for signal acquisition. It includes various features such as offset mitigation for Wheatstone bridge, programmable gain for instrumentation amplifier, and SAR ADC for signal digitization. The ASIC prototype is produced in XFAB 180-nm CMOS process and successfully meets the requirements of industrial applications.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
