Article
Engineering, Environmental
Dana Kadadou, Lina Tizani, Vijay S. Wadi, Fawzi Banat, Habiba Alsafar, Ahmed F. Yousef, Shadi W. Hasan
Summary: This study investigated the on-site detection of SARS-CoV-2 in municipal wastewater for the first time. A reduced graphene oxide (rGO)-based biosensor was developed and demonstrated rapid, sensitive, and selective detection of the virus. The biosensor showed feasibility in detecting SARS-CoV-2 in clinical samples as well as unfiltered and unprocessed municipal wastewater.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Hyun-June Jang, Xiaoyu Sui, Wen Zhuang, Xiaodan Huang, Min Chen, Xiaolei Cai, Yale Wang, Byunghoon Ryu, Haihui Pu, Nicholas Ankenbruck, Kathleen Beavis, Jun Huang, Junhong Chen
Summary: This study proposes a new nanomaterial-based field-effect transistor (FET) configuration for stable and reliable clinical applications. By investigating the surface characteristics and electrochemical instability of two-dimensional reduced graphene oxide (rGO), highly efficient detection of SARS-CoV-2 spike proteins is achieved.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Fatemeh Haghayegh, Razieh Salahandish, Mohsen Hassani, Amir Sanati-Nezhad
Summary: This study presents a stable buffer-based zinc oxide/reduced graphene oxide nanocomposite coated on carbon screen-printed electrodes for the electrochemical immuno-biosensing of SARS-CoV-2 protein antigens. The biosensor shows a low limit of detection, stable sensor nanocoating, high sensitivity, and the ability to rapidly discriminate positive and negative clinical samples.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Deependra Kumar Ban, Tyler Bodily, Abhijith G. Karkisaval, Yongliang Dong, Shreyam Natani, Anirudh Ramanathan, Armando Ramil, Sunil Srivastava, Prab Bandaru, Gennadi Glinsky, Ratnesh Lal
Summary: A DNA aptamer-conjugated graphene field-effect transistor (GFET) biosensor platform has been developed for the rapid detection of SARS-CoV-2 and its variants in saliva samples. The biosensor is label-free and highly sensitive, with a sensor response that correlates with RT-PCR data and epidemiological population-scale data. This universal pathogen-sensing platform has broad applications in public health and real-time environmental monitoring.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Hua Kang, Xuejun Wang, Mingquan Guo, Changhao Dai, Renzhong Chen, Lei Yang, Yanling Wu, Tianlei Ying, Zhaoqin Zhu, Dapeng Wei, Yunqi Liu, Dacheng Wei
Summary: The development of a graphene field-effect transistor (g-FET) biosensor has enabled ultrasensitive detection of SARS-CoV-2 antibodies with rapid and precise diagnosis capabilities. This technology holds great promise in future prevention and control of other epidemic outbreaks.
Article
Chemistry, Physical
Mingrui Chen, Dingzhou Cui, Zhiyuan Zhao, Di Kang, Zhen Li, Shahad Albawardi, Shahla Alsageer, Faisal Alamri, Abrar Alhazmi, Moh R. Amer, Chongwu Zhou
Summary: Developing convenient and accurate SARS-CoV-2 antigen and antibody tests is crucial in curbing the global COVID-19 pandemic. In this study, an improved indium oxide (In2O3) nanoribbon field-effect transistor (FET) biosensor platform was developed for detecting both SARS-CoV-2 antigen and antibody.
Article
Biophysics
Soaram Kim, Heeju Ryu, Sheldon Tai, Michael Pedowitz, John Robertson Rzasa, Daniel J. Pennachio, Jenifer R. Hajzus, Donald K. Milton, Rachael Myers-Ward, Kevin M. Daniels
Summary: This study reported a rapid detection method for SARS-CoV-2 using a portable sensor, which could detect the virus even at concentrations as low as 60 copies/mL in infected patients. The sensor could detect the S1 spike protein antigen of the virus in seconds, with a low detection concentration, and can distinguish B.1.1.7 variant positive samples with a fast response time.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Analytical
Laura Gutierrez-Galvez, Rafael del Cano, Iris Menendez-Luque, Daniel Garcia-Nieto, Micaela Rodriguez-Pena, Monica Luna, Teresa Pineda, Felix Pariente, Tania Garcia-Mendiola, Encarnacion Lorenzo
Summary: This work focuses on the development of an electrochemiluminescent nanostructured DNA biosensor for SARSCoV-2 detection, using gold nanomaterials and carbon nanodots to create an improved nanostructured electrochemiluminescent platform, with a detection limit of 514 aM for DNA sequences.
Article
Chemistry, Analytical
Yuanyuan Zeng, Lili Zhou, Zhongzhu Yang, Xiuzhong Yu, Zhen Song, Yang He
Summary: This study presents a highly sensitive graphene oxide (GO)-multiplex qPCR method for simultaneous detection of two SARS-CoV-2 genes and one reference gene, which improves the sensitivity of the assay and reduces the limit of detection by 10-fold.
ANALYTICA CHIMICA ACTA
(2022)
Article
Biochemistry & Molecular Biology
Xu Yang, Zheng-Zhi Yin, Guojun Zheng, Min Zhou, Hongyu Zhang, Junyao Li, Wenrong Cai, Yong Kong
Summary: A surface molecularly imprinted miniature biosensor was developed for accurate detection of SARS-CoV-2 spike protein. The biosensor exhibited high sensitivity, specificity, and stability, and had a linear range of 0.1 to 1000 ng mL(-1) and a limit of detection of 38 pg mL(-1). It was successfully applied for the detection of SARS-CoV-2 spike protein in clinical serum samples.
BIOELECTROCHEMISTRY
(2023)
Article
Environmental Sciences
Shuqing Zhou, Min Jin, Rong Tan, Zhiqiang Shen, Jing Yin, Zhigang Qiu, Zhengshan Chen, Danyang Shi, Haibei Li, Zhongwei Yang, Huaran Wang, Zhixian Gao, Junwen Li, Dong Yang
Summary: The study demonstrates that CTAB-functionalized rGO-Fe3O4 composites have efficient adsorption capabilities for human enteric viruses and SARS-CoV-2, and can be used in complex water environments. Additionally, the composite can help concentrate virus particles before qPCR analysis, significantly improving detection sensitivity.
Article
Chemistry, Multidisciplinary
Matthew Ravalin, Heegwang Roh, Rahul Suryawanshi, G. Renuka Kumar, John E. Pak, Melanie Ott, Alice Y. Ting
Summary: The study presents a simplified and easily producible recombinant luminescent biosensor that can be used to detect SARS-CoV-2 antigen and virus in various assay formats, enabling detection using a cell phone camera.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Analytical
Shalu Yadav, Mohd Abubakar Sadique, Pushpesh Ranjan, Raju Khan
Summary: In this study, a straightforward and label-free electrochemical immunosensing strategy based on a glassy carbon electrode modified with a biocompatible and conducting biopolymer functionalized molybdenum disulfide-reduced graphene oxide (CS-MoS2/rGO) nanohybrid is proposed to investigate the SARS-CoV-2 virus. The immunosensor employs recombinant SARS-CoV-2 Spike RBD protein (rSP) to specifically identify antibodies against the SARS-CoV-2 virus. The results demonstrate that the immunosensor is capable of highly sensitive and specific detection of SARS-CoV-2 antibodies and can differentiate between positive and negative samples accurately.
ANALYTICA CHIMICA ACTA
(2023)
Article
Biophysics
Isabela A. Mattioli, Karla R. Castro, Graziela C. Sedenho, Lucyano J. A. Macedo, Mona N. Oliveira, Erika R. Manuli, Ester C. Sabino, Frank N. Crespilho
Summary: This study presents an innovative graphene-based hybrid electrical-electrochemical vertical device (EEVD) for rapid viral detection of the binding domain of SARS-CoV-2 spike protein in both serum and saliva. The EEVD demonstrates a low limit of detection, high sensitivity, and rapid processing time, making it a low-cost solution for early phase COVID-19 infections.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Analytical
Pravanjan Malla, Chi-Hsien Liu, Wei-Chi Wu, Pinpinut Kabinsing, Paiboon Sreearunothai
Summary: This article describes a rapid and sensitive electrochemical assay for quantifying the CoV-2 nucleocapsid gene using magnetic nanocomposite and DNA sandwich probes, with a detection limit of 0.37 fM.
Article
Materials Science, Composites
Jose Castaneda-Via, Carlos Landauro, Justiniano Quispe-Marcatoma, Ana Champi, Fred Montalvo, Leyla Delgado, Lidia Yileng Tay, Marie-Jose Moya, Ronald Guillen, Francisco Rumiche, Victor Pena-Rodriguez
Summary: The mechanical strength of HAp/QC composites increases with the concentration of quasicrystalline reinforcement, with a 43% increase in Young's modulus and a 21% increase in compressive strength at a 10 wt% QC reinforcement. Additionally, the composite did not exhibit cytotoxicity at any QC concentration, indicating its potential for applications in the biomedical industry.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Physics, Condensed Matter
Lucas Barreto, Luis Henrique de Lima, Daniel Coutinho Martins, Caio Silva, Rodrigo Cezar de Campos Ferreira, Richard Landers, Abner de Siervo
Summary: The study revisited the surface structure determination of graphene on Ir(111) using synchrotron-based photoelectron diffraction, determining parameters such as average height and corrugation. Experimental data near high-symmetry adsorption sites can be described by three reduced systems simplifying the analysis.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Regina Ariskina, Michael Schnedler, Pablo D. Esquinazi, Ana Champi, Markus Stiller, Wolfram Hergert, R. E. Dunin-Borkowski, Philipp Ebert, Tom Venus, Irina Estrela-Lopis
Summary: In this study, Tunneling Atomic Force Microscopy (TUNA) was used to investigate the current-voltage characteristics of highly oriented graphite samples with different stacking orders. It was found that adjusting the model to consider surface band bending due to a finite contact potential allowed for quantitative agreement between simulated and measured tunnel spectra. This research reveals insights into the electronic properties of graphite surfaces with different stacking configurations.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Chemistry, Physical
Sergio L. L. M. Ramos, Marcos A. Pimenta, Ana Champi
Summary: The study investigates the double-resonance Raman process in rhombohedral graphite and compares it with Bernal graphite, revealing that rhombohedral graphite exhibits a richer DR Raman spectrum due to its larger Brillouin zone volume. The 2D band of rhombohedral graphite is broader and shows different dispersive behavior compared to Bernal graphite. Additionally, the intervalley TO-LA band of rhombohedral graphite is broader and richer in features.
Article
Physics, Multidisciplinary
L. Akashi, H. Ferreira, J. Villanueva, M. Yactayo, C. Landauro, J. Quispe-Marcatoma, L. Barreto, R. N. Gontijo, C. Fantini, M. A. Pimenta, A. Champi
Summary: In this study, the interaction between silver and micromechanical exfoliated bilayer graphene (BLG) was investigated using Raman spectroscopy. The behavior of the most characteristic Raman BLG bands was evaluated as a function of the laser energy. The presence of silver on BLG resulted in the appearance of the D band, and the behavior of the 2D and G bands indicated graphene doping.
BRAZILIAN JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
W. Rondan, M. Rivera, D. Acosta, R. Puga, H. Loro, C. Eyzaguirre, A. Champi
Summary: Fluorescent beta-NaYF4 to Yb3+/Ho3+@SiO2 nanoparticles with variations in the ratios of fluorine and yttrium have been synthesized and characterized. The results show that nanoparticles with a 20:1 ratio have a hexagonal crystalline phase and higher upconversion luminescence intensity compared to other ratios. However, the luminescence intensity is decreased with SiO2 coating.
BRAZILIAN JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Analytical
Ronaldo Challhua, Ana Champi
Summary: A low-cost 3D-printing system for thin film deposition is reported. The system is constructed using 3D-printed polylactic acid (PLA) pieces, making it easy to assemble and replicate. An Arduino controls the system and allows for adjustable pulling and dipping speed. The performance of the system is validated by depositing rGO thin films onto gold.
INSTRUMENTATION SCIENCE & TECHNOLOGY
(2023)
Article
Optics
M. A. G. Balanta, W. J. F. da Silva Filho, M. C. G. Souza, R. M. N. de Assuncao, A. Champi, R. F. Cuevas
Summary: In this study, the photoluminescence properties of carbon dots obtained from microcrystalline cellulose were investigated. It was found that the emission and bandwidth of the fluorescence were dependent on the excitation wavelength and there were contributions from both core and surface states in the luminescence emission of the carbon dots. These findings provide insights into the electronic transitions of carbon dots and their applications related to luminescent optical properties.
JOURNAL OF LUMINESCENCE
(2023)
Article
Biophysics
Ronaldo Challhua, Larissa Akashi, Jose Zuniga, Helena Beatriz de Carvalho Ruthner Batista, Ricardo Moratelli, Ana Champi
Summary: This study presents a portable electrochemical biosensor for the detection of rabies virus in nasopharyngeal swab samples. The biosensor utilizes nucleic acid interactions and a working electrode composed of reduced graphene oxide (rGO) thin-film immobilized with cDNA. The results show that the biosensor has good selectivity and sensitivity for RABV detection in both RNA and swab samples.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Shuanghui Zeng, Xue Wang, Yunqian Zhang, Jiaojing Shao, Zhao Ding, Jie Zhao
Summary: A free-standing 3D core/shell composite material CNTs@Co9S8 on nickel mesh has been prepared using a simple two-step method. The composite material exhibits excellent conductivity and charge storage capability, making it a promising candidate for supercapacitor applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Marieta Belcheva, Georgi Georgiev, Boyko Tsyntsarski, Urszula Szeluga, Lyudmila Kabaivanova
Summary: This study successfully prepared new antibacterial materials by combining activated carbon with metal nanoparticles, taking advantage of the well-known antibacterial activity of metal nanoparticles. The obtained composites exhibited strong antibacterial effects against E. coli and S. aureus, with the antibacterial activity depending on the contact time, bacterial species, nature of the metal, and metal concentration. The findings provide novel materials with antibacterial properties for further development and potential application in hygiene devices.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
V. P. Madhurima, Kusum Kumari, P. K. Jain
Summary: In this study, carbon nanomaterials were synthesized using the arc discharge technique, with a focus on optimizing process parameters to improve yield and quality. The materials were characterized using various analytical tools, and their dye adsorption capabilities were evaluated. The results showed that carbon soot had better adsorption performance compared to carbon nanotubes, indicating the potential of these carbon nanomaterials for environmental remediation applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zhaolong Sun, Bo Cui, Pingping Liang, Qimeng Liu, Nan Gao, Hongdong Li
Summary: This study explores the potential of hafnium (Hf) terminated diamond surfaces in achieving negative electron affinity (NEA). By using swarm-intelligence structural search and first-principles calculations, the researchers found that Hf-terminated diamond surfaces exhibit stable NEA properties and high thermal stability, making them promising candidate materials for electron emission applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
N. Soltani, N. Tavakkoli, E. Eslami, L. S. Mirmohammadi
Summary: In this project, a carbon paste electrode modified with graphene and ZnFe2O4 spinel nanoparticles (Gr/ZnFe2O4/CPE) was used to measure naproxen, and various electrochemical methods were used to investigate its behavior. By optimizing the parameters, good measurement results were obtained.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xiwei Cui, Yue Qin, Xin Han, Huanyi Chen, Xinxin Ruan, Hui Zhang, Chengcheng Jiao, Rongqi Mao, Jinglin Hao, Sizhuang Zhao, Shuai Hou, Xiaoxuan Pian, Yandong Wang, Kazuhito Nishimura, Lifen Deng, Nan Jiang
Summary: This paper investigates the friction and wear behaviors of two types of polycrystalline diamonds against different materials. The results show that increasing surface roughness leads to an increase in coefficient of friction. The coefficient of friction and wear rate of ceramic Si3N4 balls are generally lower than those of steel GCr15 balls, except for one type of polycrystalline diamond. Transfer films of SiO2 and its hydrate are observed at the friction interface, which contribute to smoother friction and wear. Carbon-based transfer films are also identified, mainly catalyzed by residual cobalt in the polycrystalline diamonds, leading to a phase transformation.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Menglei Sun, Pengjun Li, Mao Wang, Yidan Liang, Xudong Yang, Shujie Pang
Summary: In this study, carbonized polymer dots were synthesized by a one-step hydrothermal method, and silver nanoclusters were synthesized by UV lamp irradiation. They were then self-assembled by electrostatic force to prepare a dual-emission fluorescent nanocomposite that responds to temperature changes. The nanocomposite showed two emission peaks and exhibited excellent linearity between 20°C and 80°C.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Mohamed J. Saadh, Durgesh Singh, Diego Mayorga, Anjan Kumar, Maria Albuja, Ahmad Ismael Saber, Mohammed Ahmed Mustafa, Yasser Elmasry, Noubu Sun
Summary: Based on density functional theory, it is found that the C3N monolayer has good adsorption capability for Hg0 and a short recovery time. This study suggests that the C3N monolayer is a promising adsorbent material for efficient control of gaseous mercury.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Rajendra Kumar Nare, Sivalingam Ramesh, Vijay Kakani, Yuvaraj Haldorai, Chandrasekaran Karthikeyan, Basivi Praveen Kumar, Nadavala Siva Kumar, Mohammad Asif, S. Naresh Kumar, D. Prakash Babu, K. Ramakrishna Reddy, Visweswara Rao Pasupuleti
Summary: This study examines the latest advancements in carbon nanotube (CNT) supercapacitors and related composites, aiming to identify strategies for enhancing their performance. The researchers used ultrasonication aided hydrothermal technique to synthesize a composite made of nitrogen doped carbon nanotubes and porous NiCo2O4 nanomaterial. The composite electrode exhibited excellent cycling stability and a rising specific capacitance, making it appealing for high-performance supercapacitor applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
D. Mary Deena, S. Arockia Anushya, A. Dhanusha, T. C. Sabari Girisun, A. Philominal
Summary: A single-beam Z-Scan experiment was conducted to investigate the nonlinear optical absorption and optical limiting properties of Bi2O3, rGO/Bi2O3, Bi2O3/WO3, and rGO/Bi2O3/WO3 nanostructures. The results showed that the synthesized nanostructures exhibited varying levels of nonlinear absorption, with bismuth-based nanostructures showing the lowest optical limiting threshold and a higher two-photon absorption coefficient. The presence of rGO contributed to the extended conjugation for charge transfer, while the strong UV-Visible absorption of Bi2O3 and WO3 led to a unique nonlinear optical response.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Weibing Guo, Yiren Hu, Tao Wang, Xiaoguang Chen
Summary: This study investigated the microstructure and forming mechanism of graphite/copper joints that were brazed using Ti-containing filler. The results showed that increasing the brazing temperature improved the heat transfer and tensile properties of the composites. Additionally, the composites exhibited high heat flux and faster heating rate compared to copper and aluminum.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ming Li, ZhiWen Wang, Yu Teng, Hongyu Zhao, Bowei Li, Yang Liu, Shengxue Wang, Zhenze Yang, Liangchao Chen, Hongan Ma, Xiaopeng Jia
Summary: In the experiment, different Ni-content catalysts were used to synthesize diamond crystals, and the properties of the synthesized diamonds were analyzed. The results revealed that the Ni content in the catalyst affects the crystallinity of diamond crystals and the nitrogen crystallinity. The photoluminescence spectroscopy also showed that the diamond synthesized by using Fe-containing catalyst has specific NV-color center structure.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ling-Feng Mao
Summary: This study proposes an LSTM model to predict the work function of adsorbed metal atoms on graphene, which can quickly screen surface structures with target work function, saving computing and time costs, and improving device performance.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Runzhou Xu, Yinshui Liu, Qian Cheng, Zhenyao Wang, Kai Ma, Peiling Ke, Yipan Deng
Summary: The wear resistance of 17-4PH stainless steel was significantly improved by depositing multi-layered Cr/CrC/DLC coating at wide temperature range. The coating exhibited excellent lubrication and protective properties, and the wear mechanism changed with increasing temperature. The tribochemical reaction during the wear process played a crucial role in the graphitization transformation and friction properties of the coating.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xilong Guo, Jiaxin Song, Shanling Wang, Li Lei, Omololu Odunmbaku, Ayoub Taallah, Yi He, Aiqun Gu, Filippo S. Boi
Summary: The recent observations of superconductive-ordering in carbon-based systems consisting of rhombohedral stacking-faults, trilayer graphene (ABC-stacks) or dislocation-rich interfaces (pyrolytic graphite) have attracted significant attention. In this study, an unusual nucleation of rhombohedral stacking-faults in low-dimensional systems comprising of multiwall carbon nanotube (CNT) buckypapers was reported. The presence of sulfur doping resulted in a broad-band at the Raman shift from 1800 to 2000 cm(-1), indicating contributions arising from disorder-rich regions with rhombohedral stacking-order (ABC-stacks). These observations were further supported by X-ray diffraction and Rietveld refinements.
DIAMOND AND RELATED MATERIALS
(2024)