Article
Chemistry, Analytical
Ryoichi Nakagawa, Kai Saito, Hideyuki Kanematsu, Hidekazu Miura, Masatou Ishihara, Dana M. Barry, Takeshi Kogo, Akiko Ogawa, Nobumitsu Hirai, Takeshi Hagio, Ryoichi Ichino, Masahito Ban, Michiko Yoshitake, Stefan Zimmermann
Summary: Biofilms are the result of bacterial activity and a sensor that can detect biofilms is important. Graphene, which easily bonds with carbon compounds, could serve as a sensor for monitoring biofilm formation and growth. Previous research showed that CVD graphene film has higher sensitivity for biofilm formation. This new research focuses on preparing bilayer graphene with high mechanical strength to overcome the mechanical disadvantage of monolayer graphene when used as a biofilm sensor.
Article
Chemistry, Physical
L. E. Lopez-Gonzalez, J. Guerrero-Sanchez, H. Tiznado
Summary: In this study, Stearic acid (SA) self-assembled monolayer (SAM) was proposed as a soft-removal passivating agent for area selective atomic layer deposition (AS-ALD) applications. The experimental results showed that SA SAM formed a highly packed, hydrophobic, and ordered monolayer on a copper surface, transitioning to disorder above 160 degrees C. Furthermore, SA demonstrated good stability as a non-growth surface for ZnO ALD, and could be completely removed with ethanol at room temperature.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Mingyang Wang, Hu Li, Qian Xin, Mingyu Zhuang, Zhiyuan Wang, Yuzhuo Yuan, Xuemei Yin, Xiaoxiao Zheng, Jiawei Zhang, Aimin Song
Summary: Self-assembled monolayer (SAM) treatment is effective for improving the electrical performance of organic thin-film transistors (TFTs) by reducing interface traps. However, it has been rarely explored in inorganic TFTs due to potential damage to thin SAMs during the deposition processes. This study demonstrates the feasibility of using SAM treatment on the gate dielectric of inorganic p-type Zn-doped CuI TFTs to enhance their performance significantly, including a reduction in interface trap density, an increase in hole mobility, an improvement in on/off ratio, and an enhancement in bias stress stability.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Juanjuan Guo, Yang Xu, Caili Fu, Longhua Guo
Summary: Surface-enhanced Raman spectroscopy (SERS) is a promising analytical technique with sensitivity at the single-molecule level, but faces challenges in preparing large-scale, reproducible, and highly sensitive substrates. In this study, a new strategy using CTAB as a connection agent successfully fabricates an efficient Ag collide SERS substrate, demonstrating significant improvement in detection efficiency and reproducibility for applications on a large scale.
Article
Chemistry, Multidisciplinary
Isha M. Datye, Alwin Daus, Ryan W. Grady, Kevin Brenner, Sam Vaziri, Eric Pop
Summary: Strain can significantly enhance the electron mobility of two-dimensional semiconductors, which is crucial for applications such as flexible strain sensors.
Article
Chemistry, Physical
Shi Li, Hongru Zhang, Zheng Liu, Junquan Xu, Guofang Fan, Wei Li, Qi Li, Xiaodong Hu, Gaoshan Jing
Summary: Developing novel metrology techniques is crucial in semiconductor fabrication to accurately characterize thin films with nanometer-scale thickness and material profiles. In this study, uniform trichlorosilane self-assembled monolayer patterns were fabricated using conventional semiconductor fabrication techniques, and were thoroughly characterized using Time-of-Flight Secondary Ion Mass Spectrometry. The results demonstrate the high surface-sensitivity and accuracy of this technique in obtaining information about self-assembled monolayer patterns in a point-by-point manner, making it a promising metrology technique for high-quality micro and nanostructures in the semiconductor process.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Fangshun Yang, Raphael D. Urban, Jonas Lorenz, Jan Griebel, Nima Koohbor, Markus Rohdenburg, Harald Knorke, Daniel Fuhrmann, Ales Charvat, Bernd Abel, Vladimir A. Azov, Jonas Warneke
Summary: Despite its primarily analytical function, mass spectrometry also has potential as a synthetic tool, facilitating advanced synthesis routes by reactions in charged microdroplets or ionic thin layers. In this study, two preparative mass spectrometry methods were used to generate products at a nanomolar scale, allowing for further characterization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
Jaismon Francis, S. A. Bassam, C. S. Suchand Sangeeth
Summary: This paper compares the contact resistance values estimated using both DC and impedance spectroscopic data of alkanethiolate SAM-based molecular junctions reported previously. It shows that DC measurements alone fail to show the actual molecular behaviour of the junction for molecular tunnel junctions with a resistive protective layer (PL), while impedance measurements estimate the actual values of contact resistance and identify the bottlenecks in charge transport through such a defective molecular junction.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Xin Yu, Xitang Qian, Qinwei Wei, Qing Zhang, Hui-Ming Cheng, Wencai Ren
Summary: A class of robust charge-selective membranes, consisting of monolayer nanosheets with inherent surface charges, have been reported. These membranes exhibit superhigh cation/anion selectivity, outperforming previously reported ion-selective membranes. They maintain excellent ion selectivity even in high-concentration salt solutions, acidic and alkaline conditions, and for a wide range of ions of different sizes and charges. By coupling cation-selective and anion-selective membranes, a reverse electrodialysis device with high energy conversion efficiency has been constructed. This work provides a new strategy for designing high-performance ion-selective membranes using 2D nanosheets.
Article
Materials Science, Multidisciplinary
V. S. Prudkovskiy, K. P. Katin, M. M. Maslov
Summary: This study focuses on the quality control of a new two-dimensional semiconductor material based on the molecular structure of TTA during large-scale production. It demonstrates that Raman and IR spectroscopy can be efficient tools for this purpose.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Biochemical Research Methods
Jingya Li, Qianqian Wang, Juan Wang, Man Li, Xiang Zhang, Longlong Luan, Pan Li, Weiping Xu
Summary: The study developed a quantitative SERS sensor based on gold-silver heterogeneous nanocuboids for detecting pesticides on agricultural produce and pollutants in fishpond water. Chemically functionalized densely packed Au@Ag NCs monolayer exhibited high SERS performance.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Yurong Zhao, Xuzhi Hu, Limin Zhang, Dong Wang, Stephen M. King, Sarah E. Rogers, Jiqian Wang, Jian R. Lu, Hai Xu
Summary: Controlling the dimension of nanostructures self-assembled from short peptides remains a challenge, with peptide bolaamphiphiles forming nanotubes due to the interplay between side chain structure and hydrophobicity; changes in amino acid side chain structure can significantly impact nanostructure formation, with the introduction of hydroxyl groups alleviating steric hindrance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Martha L. Jimenez-Gonzalez, Juan Pablo F. Rebolledo-Chavez, Marisela Cruz-Ramirez, Rene Antano, Angel Mendoza, Narayan S. Hosmane, Lena Ruiz-Azuara, Jose Luis Hernandez-Lopez, Luis Ortiz-Frade
Summary: In this work, an electrochemical study of the Boron cage monomercaptoundecahydro-closo-dodecaborate [B12H11SH](2-) in solution and in a self-assembled monolayer over a gold electrode was conducted. The study revealed the interaction between the boron cage and the gold surface, formation of a self-assembled monolayer, and the reduction of active sites on the gold surface due to the presence of the boron cage. Bulkier thiols were found to enhance charge accumulation at the electrode-solution interface.
Article
Chemistry, Physical
Yalan Li, Li Jiang, Yanqiu Zou, Zhengbo Song, Shangzhong Jin
Summary: A novel SERS sensor is proposed for detecting low concentrations of GSH in human serum, utilizing a dense monolayer film of self-assembly Au Nano cubes to enhance Raman spectroscopy through electrostatic interaction. The sensor shows a linear relationship between the relative spectral intensity of TNB characteristic peak and the concentration of GSH between 50 and 750 nM, with a detection limit of 50 nM. The SERS substrate used in the sensor is easy to prepare, highly uniform, and reproducible, offering potential for clinical applications in sensitive and quantitative detection of trace analytes.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Dominik Scherrer, David Vogel, Ute Drechsler, Antonis Olziersky, Christof Sparr, Marcel Mayor, Emanuel Loertscher
Summary: The study used Au nanohole arrays as SERS substrates to monitor solid-phase deprotection and click reactions. The results showed that the SERS substrate exhibited reliability in terms of signal reproducibility and chemical stability, and could be used to identify solid-phase intermediate and products.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Environmental Sciences
Benjamin Dubansky, Guido Verbeck, Phillip Mach, Warren Burggren
ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY
(2018)
Article
Medicine, Legal
Ethan M. McBride, Guido F. Verbeck
FORENSIC SCIENCE INTERNATIONAL
(2018)
Article
Physics, Atomic, Molecular & Chemical
Ethan M. McBride, Reagann E. Keller, Guido F. Verbeck
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2018)
Article
Chemistry, Physical
J. D. Femi-Oyetoro, K. Yao, K. Roccapriore, P. A. Ecton, R. Tang, J. D. Jones, G. Verbeck, J. M. Perez
APPLIED SURFACE SCIENCE
(2019)
Article
Materials Science, Coatings & Films
John D. Femi-Oyetoro, Kevin Yao, Runtian Tang, Phillip Ecton, Kevin Roccapriore, Ashley Mhlanga, Guido Verbeck, Duncan L. Weathers, Jose M. Perez
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2019)
Article
Chemistry, Analytical
Holly-May Lewis, Roger P. Webb, Guido F. Verbeck, Josephine Bunch, Janella de Jesus, Catia Costa, Vladimir Palitsin, John Swales, Richard J. A. Goodwin, Patrick Sears, Melanie J. Bailey
ANALYTICAL CHEMISTRY
(2019)
Article
Toxicology
Subhayu Nayek, Imesha W. De Silva, Roberto Aguilar, Amie K. Lund, Guido F. Verbeck
Summary: Silver nanoparticles have diverse applications in medicine and various industries. Inhalation of these nanoparticles leads to accumulation in the lungs, liver, and kidneys, resulting in systemic toxicity.
JOURNAL OF APPLIED TOXICOLOGY
(2021)
Article
Instruments & Instrumentation
Subhayu Nayek, Roberto Aguilar, Lauren A. Juel, Guido F. Verbeck
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Biochemical Research Methods
Imesha W. De Silva, Alleigh Nicole Couch, Guido F. Verbeck
Summary: The study investigates the growing threat of fentanyl and its related synthetic analogs to public safety, and introduces a rapid detection method using paper spray mass spectrometry (PS-MS) with Teslin substrate, which requires minimal sample for analysis and can improve the accurate detection of synthetic opioids. The research also highlights the potential of PS-MS for enhancing the structural characterization of complex samples with minimal interference of isobaric components.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2021)
Article
Environmental Sciences
Subhayu Nayek, Amie K. Lund, Guido F. Verbeck
Summary: The study found that exposure to silver nanoparticles can lead to increased hepatic RAS signaling, inflammation, macrophage infiltration, and oxidative stress in rats.
ENVIRONMENTAL TOXICOLOGY
(2022)
Article
Physics, Atomic, Molecular & Chemical
Camila A. Virgen, James D. Fox, Peter Santariello, Jaime L. Winfield, Kenneth C. Wright, Guido F. Verbeck
Summary: There is a growing demand for the development and improvement of technology used for the detection and identification of Chemical Warfare Agents. The current detection technology used by the U.S. government, while sensitive, is not considered rapid. The Membrane Inlet Mass Spectrometric (MIMS) technology on a portable system has shown success in rapid analysis and identification of CWA simulants, outperforming current FTIR and LCD systems in terms of speed.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2021)
Article
Chemistry, Analytical
Imesha W. De Silva, Subhayu Nayek, Vijay Singh, Jay Reddy, John K. Granger, Guido F. Verbeck
Review
Chemistry, Analytical
Imesha W. De Silva, Amanda R. Kretsch, Holly-May Lewis, Melanie Bailey, Guido F. Verbeck
Article
Chemistry, Analytical
Imesha W. De Silva, Darren T. Converse, Lauren A. Juel, Guido F. Verbeck
ANALYTICAL METHODS
(2019)
Article
Hematology
Weam Fallatah, Imesha W. De Silva, Guido F. Verbeck, Pudur Jagadeeswaran