Article
Chemistry, Multidisciplinary
Dhamelyz Silva-Quinones, Robert E. Butera, George T. Wang, Andrew Teplyakov
Summary: The study found that both boric acid and 4-fluorophenylboronic acid preferentially react with Cl-terminated Si(100) surfaces rather than H-terminated ones. On Cl-Si(100) surfaces, the reaction with 4-fluorophenylboronic acid introduces boron more effectively compared to boric acid.
Article
Chemistry, Physical
T. V. Pavlova, V. M. Shevlyuga, B. V. Andryushechkin, K. N. Eltsov
Summary: This study reports the removal of individual halogen atoms from Si(100)-2x1-Cl and -Br surfaces in STM. The charge states of DBs formed on the Si surface can be manipulated, allowing for tuning the reactivity of the Cl- and Br-terminated surfaces.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Esther Frederick, Quinn Campbell, Igor Kolesnichenko, Luis F. Pena, Angelica Benavidez, Evan M. Anderson, David R. Wheeler, Shashank Misra
Summary: This study demonstrates the achievement of ultradoping concentrations of boron using a solvothermal process, but faces challenges such as catalyst cross-reactions and ambiguity in experimental confirmation of direct surface attachment.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Esther Frederick, Quinn Campbell, Angelica Benavidez, David R. Wheeler, Shashank Misra
Summary: Traditional approaches for functionalizing silicon with dopants involve grafting the dopant onto silicon substrates through O-Si or C-Si bonds, resulting in indirect attachment. Recent ultrahigh vacuum work has shown that high densities of direct B-Si bonds can enable unprecedented electronic behaviors in silicon, making it a potential next-generation electronic material. Work is currently being done to develop solvothermal approaches for forming direct dopant-Si bonds to further enhance the potential of silicon in the electronic materials field.
Article
Chemistry, Applied
Yonghui Li, Rongjie Yang, Jianmin Li
Summary: ATPB may serve as a new type of propellant binder through click chemistry reaction between alkynyl and azide group, with significant implications for design. The study reveals that both terminal C equivalent to C and middle C=C bonds of ATPB can react with azide groups, with the reactivity of the C equivalent to C bond being significantly higher than that of the C=C bonds. Additionally, the use of copper (I) catalyst weakens the reaction between azide group and the C=C bonds of HTPB.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2021)
Article
Chemistry, Physical
Timo Glaser, Jannick Meinecke, Christian Laenger, Julian Heep, Ulrich Koert, Michael Duerr
Summary: The synthesis of organic bilayers on silicon was achieved through a combination of surface functionalization under ultrahigh vacuum conditions and solution-based click chemistry; each reaction step was monitored in UHV, with up to 50-60% of the ethynyl cyclopropyl cyclooctyne molecules on the surface reacting with the azide groups.
JOURNAL OF PHYSICAL CHEMISTRY C
(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
Chemistry, Physical
Deb Kumar Bhowmick, Adrian Joe Urban, Manfred Bartsch, Bjoern Braunschweig, Helmut Zacharias
Summary: Efficient control of interface chemistry enables better tunability of electronic properties, and a novel near-UV-initiated direct modification method has been demonstrated to form stable organic monolayers on silicon surfaces with high hydrolytic stability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Motoharu Imai, Kwangsik Han, Mitsuaki Nishio, Takeshi Kato, Satoshi Kawada, Satoshi Emura, Taichi Abe, Hiroshi Fujihisa
Summary: Cubic SrSi2 is a potentially significant material in thermoelectricity and material science. However, its physical properties have not been thoroughly examined. This study investigates the Sr-Si phase diagram at different silicon content and identifies two intermetallic compounds and two eutectic reactions within the Si content range of 55-100 at%. Additionally, the study presents the crystal structure of the newly discovered SrSi2-X compound.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Azadeh Farzaneh, R. E. Butera
Summary: This study aims to investigate Si thin film growth process on Cl-Si(100). The research found that the diffusion barrier for Si adatoms on Cl-Si(100) is 0.66-0.88 eV and verified through SIMS depth profiling that chlorine segregates towards the growth surface during Si deposition and is effectively removed at 850 K. TEM imaging results confirmed that good film crystallinity can be achieved at low temperatures (600 K).
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Niklas D. Keller, Pierpaolo Vecchi, David C. Grills, Dmitry E. Polyansky, Gabriella P. Bein, Jillian L. Dempsey, James F. Cahoon, Gregory N. Parsons, Renato N. Sampaio, Gerald J. Meyer
Summary: Photovoltages for hydrogen-terminated p-Si(111) in an acetonitrile electrolyte were quantified using MV2+ and [Ru(bpy)3](PF6)2. The reduction potentials of MV2+ occurred within the forbidden bandgap, while those of [Ru(bpy)3]2+ occurred within the conduction band states. The study reveals that the most optimal photovoltage, electron-hole pair lifetime, and surface electron concentration occur when the reduction potentials lie energetically within the unfilled conduction band states with an inversion layer.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Martin Hladik, Antonin Fejfar, Hector Vazquez
Summary: The study investigates the doping mechanism of hydrogen-passivated Si(100) substrates through the adsorption of dithiocarborane molecules using density functional theory. The results show that dithiocarboranes can both physisorb and chemisorb on the substrate, forming stable structures with promising electronic properties at room temperature. The large electrostatic dipole of carborane molecules proves to be a promising strategy for non-destructively doping semiconductor substrates.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Review
Nanoscience & Nanotechnology
Ting Wu, Christopher M. Fitchett, Paula A. Brooksby, Alison J. Downard
Summary: Aryldiazonium ions are widely used for surface modification due to their wide substrate compatibility, formation of stable covalent bonding, simple modification methods, and commercial availability of aniline precursors. This method allows for further on-surface chemistry and broadens the range of species that can be immobilized. The resulting materials have been applied in various fields such as chemical sensors, biosensors, catalysis, optoelectronics, composite materials, and energy conversion and storage.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Kouji Inagaki, Yoshitada Morikawa, Hiromasa Ohmi, Kiyoshi Yasutake, Hiroaki Kakiuchi
Summary: The diffusion properties of an excess hydrogen atom on a fully hydrogenated Si surface were analyzed using density functional theory calculations, revealing small activation energies for diffusion pathways. The weak adsorption energy of the excess H atom was found to be responsible for the small activation energy of diffusion.
Article
Polymer Science
Ozge Ozukanar, Emrah Cakmakci, Ozgun Daglar, Hakan Durmaz, Volkan Kumbaraci
Summary: The study investigated the use of eugenol as a bio-based building block for the preparation of thermoset materials. By combining thiol-ene photopolymerization and thermal azide-alkyne cycloaddition click reactions, eugenol-based coatings with P-, N-, and Si-containing networks were successfully synthesized. These coatings showed excellent thermal stability, optical transparency, pendulum hardness, solvent resistance, and adhesion performance. They also exhibited high gel content and char yield, and resistance to acidic and basic conditions as well as solvents.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Biochemistry & Molecular Biology
Duyen H. T. Nguyen, Robert H. Utama, Kristel C. Tjandra, Panthipa Suwannakot, Eric Y. Du, Maria Kavallaris, Richard D. Tilley, J. Justin Gooding
Summary: This study develops a synthetic hydrogel with ionic cross-linking to rapidly create hydrogels. The mechanical stiffness of the hydrogel can be tuned by varying the number of charged ionic groups, the length of the polymer arms, and the polymer concentration. It is demonstrated as an extracellular matrix mimic for 3D in vitro cell models.
Article
Chemistry, Physical
Samuel V. Somerville, Peter B. O'Mara, Tania M. Benedetti, Soshan Cheong, Wolfgang Schuhmann, Richard D. Tilley, J. Justin Gooding
Summary: Enzymes with multiple active sites and control over the solution environment enable the formation of complex products from simple reactants. We mimic this concept using nanoparticles to facilitate the electro-chemical carbon dioxide reduction reaction. By altering the rate of CO2 delivery, the activity of the CO producing site, and the applied potential, we show that stable nanoparticles with lower CO formation activity can produce greater amounts of hydrocarbon products. This highlights the importance of the local solution environment and the stability of the catalyst in cascade reactions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Lucy Gloag, Agus R. Poerwoprajitno, Soshan Cheong, Zeno R. Ramadhan, Tadafumi Adschiri, J. Justin Gooding, Richard D. Tilley
Summary: In this study, hierarchical nanostructures with nanosized gold cores and nickel branches were successfully synthesized. The dimensions and morphology of these 3D structures were controlled by tuning in each synthetic step. These materials, which have high surface area, high conductivity, and surfaces that can be chemically modified, are ideal electrocatalyst supports. Coating with nickel-iron oxyhydroxide further enhanced their activity and stability for oxygen evolution reaction. This work introduces a synthetic concept to produce a new type of high-performing electrocatalyst support.
Article
Chemistry, Multidisciplinary
Samuel V. V. Somerville, Qinyu Li, Johanna Wordsworth, Sina Jamali, Mohammad Reza Eskandarian, Richard D. D. Tilley, J. Justin Gooding
Summary: Nanozymes mimic the selectivity of enzymes by utilizing features such as control over the arrangement of atoms in the active site and the placement of the active site down a nanoconfined substrate channel. The implementation of enzyme-inspired features has shown improvements in both activity and selectivity of nanoparticles for various catalytic and sensing applications. Controlled active sites on metal nanoparticle surfaces can be achieved through changing the composition of the surface metal or immobilizing single atoms on a metal substrate. Molecular frameworks and unique diffusional environments further enhance selectivity, while nanoconfined substrate channels offer additional control over selectivity through modifying the solution environment and transport of reactants and products.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Analytical
Danielle Bennett, Xueqian Chen, Gregory J. Walker, Sacha Stelzer-Braid, William D. Rawlinson, D. Brynn Hibbert, Richard D. Tilley, J. Justin Gooding
Summary: Plasmonic nanoparticles in dimer format are used for single molecule sensing, where the interaction with hairpin DNA leads to a shift in localized surface plasmon resonance. Spectroscopy may detect this shift, but point-of-care devices require a faster analysis method. By using dark-field imaging and digital analysis, the plasmonic resonance shift of thousands of dimer structures can be measured in minutes. The challenge is separating dimers from non-specifically bound clusters to achieve accurate results. The LAB-based classifier algorithm demonstrated the highest accuracy for this digital separation.
ANALYTICAL CHEMISTRY
(2023)
Correction
Chemistry, Analytical
Danielle Bennett, Xueqian Chen, Gregory J. Walker, Milad Mehdipour, Sacha Stelzer-Braid, William D. Rawlinson, D. Brynn Hibbert, Richard D. Tilley, J. Justin Gooding
ANALYTICAL CHEMISTRY
(2023)
Editorial Material
Chemistry, Analytical
Eric Bakker, Philippe Buhlmann, J. Justin Gooding, Robert E. Gyurcsanyi, Ernoe Pretsch
Article
Materials Science, Biomaterials
Panthipa Suwannakot, Stephanie Nemec, Newton Gil Peres, Eric Y. Du, Kristopher A. Kilian, Katharina Gaus, Maria Kavallaris, J. Justin Gooding
Summary: Synthetic hydrogels are widely used to mimic the extracellular matrix (ECM) and the physical and biochemical cues observed in natural ECM proteins. Researchers have developed an electrostatically crosslinked PEG-based hydrogel system to create high-throughput 3D in vitro models of the cancer environment. This hydrogel system can be degraded by breaking the interaction between oppositely charged polymer chains.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Biophysics
Ying Yang, Sanjun Fan, James A. Webb, Yuanqing Ma, Jesse Goyette, Xueqian Chen, Katharina Gaus, Richard D. Tilley, Justin Gooding
Summary: This study presents an electrochemical approach to reversible fluorescence switching of enhanced green fluorescent proteins (EGFP) on indium tin oxide coated glass. The method allows efficient switching between bright (ON) and dim (OFF) states at the single molecule level. The electrochemical fluorescence switching is fast, reversible, and can be incorporated into advanced fluorescence microscopy.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Biophysics
Daniel E. Hagness, Ying Yang, Richard D. Tilley, J. Justin Gooding
Summary: Affinity biosensors play a crucial role in various areas of human health, such as clinical diagnosis and pharmaceuticals, by utilizing specific binding between target analytes and biological ligands. Electrokinetic phenomena have been investigated as a viable option to improve the performance of affinity biosensors for higher sensitivity and lower detection limit.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Analytical
Seyedyousef Arman, Vinicius R. R. Goncales, Ying Yang, Richard D. D. Tilley, Katharina Gaus, J. Justin Gooding
Summary: This study explores a dual optical and electrical biosensor based on cells, which provides insights into cellular events. The fabrication steps and electrical characterization of microelectrodes are described. Initial experiments show that the ability of indium tin oxide (ITO) to detect biological cells at the electrode-cell layer interface mainly depends on the size of the sensing area. The impact of conductivity on the real-time impedance signal during cell adhesion on different substrates is also explored.
Editorial Material
Chemistry, Multidisciplinary
J. Justin Gooding, Jean-Francois Masson
Article
Cell Biology
Marina Ulanova, Lucy Gloag, Andre Bongers, Chul-Kyu Kim, Hong Thien Kim Duong, Ha Na Kim, John Justin Gooding, Richard D. Tilley, Joanna Biazik, Wei Wen, Perminder S. Sachdev, Nady Braidy, Alexander E. Kalyuzhny
Summary: Nanoparticle-based magnetic contrast agents have been developed for early non-invasive diagnosis of Alzheimer's disease (AD) using magnetic resonance imaging (MRI). This study developed a biocompatible magnetic nanoparticle targeted to amyloid beta (A beta) plaques to enhance the sensitivity of T2-weighted MRI for imaging of amyloid pathology in AD. The nanoparticles showed no significant cytotoxicity and were able to bind to amyloid species. The study provides promising preliminary results for the development of a targeted non-invasive method for early AD diagnosis using contrast-enhanced MRI.
Review
Chemistry, Analytical
Seyedyousef Arman, Richard D. Tilley, J. Justin Gooding
Summary: This article reviews the development of cellular impedance biosensors, electrochemical impedance spectroscopy, and the general principles and terms associated with the cell-electrode interface. This family of techniques provides real-time quantitative and sensitive information on cell responses to stimuli with high temporal resolution, and their applications in cell biology are illustrated with various examples. The current state of the field, its limitations, possible solutions, and the potential benefits of developing biosensors are discussed.
Article
Chemistry, Physical
Carlos Hurtado, Simone Ciampi
Summary: This study investigates the underlying cause of surface wear during the operation of Triboelectric nanogenerators (TENGs) and reveals that surface damage is mainly caused by high pressure rather than current density. The study also discovers a delay in the occurrence of output drop during operation, which partially explains why the deterioration of DC-TENG performance is often underestimated or not reported.
