Article
Chemistry, Multidisciplinary
Angelo Tricase, Anna Imbriano, Nicoletta Ditaranto, Eleonora Macchia, Rosaria Anna Picca, Davide Blasi, Luisa Torsi, Paolo Bollella
Summary: This study combines electrochemical and XPS experiments to investigate the conformational rearrangement of self-assembled monolayers (SAMs) on an electrode surface due to the application of an electrical field. It was found that activation and deactivation processes play a crucial role in reaction yields and conformational rearrangement, ultimately impacting the performance of bioelectronic devices.
Article
Chemistry, Physical
Igor Iatsunskyi, Gloria Gottardi, Victor Micheli, Roberto Canteri, Emerson Coy, Mikhael Bechelany
Summary: The study synthesized Pd/TiO2/Si nanopillars by metal-assisted chemical etching and atomic layer deposition, and investigated the surface using various characterization techniques. It was found that the Pd coating decreased the concentration of photoactive defects that could reduce the photoelectrochemical efficiency of TiO2.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Weijie Zhao, Mats Gothelid, Saman Hosseinpour, Malin B. Johansson, Gen Li, Christofer Leygraf, C. Magnus Johnson
Summary: The adsorption of octadecylphosphonic acid (ODPA) on copper substrates was studied, showing that a multilayer film was formed with increasing deposition time. The robustness of the film was attributed to the formation of Cu-ODPA complexes. Preadsorbing a monolayer of octadecylthiol (ODT) prevented the adsorption of ODPA by abolishing the release of Cu(I) ions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Qufei Gu, Yehan Zhang, Huan H. Cao, Songtao Ye, Tao Ye
Summary: The research demonstrates that thiolated strands displayed on a DNA origami nanostructure can be transferred to a gold surface, offering a pathway towards forming complex single-molecule nanoarrays for elucidating the structure-function relationships of enzyme cascades and interfacial molecular recognition.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Takeyuki Sekimoto, Teruaki Yamamoto, Fumito Takeno, Ryosuke Nishikubo, Maki Hiraoka, Ryusuke Uchida, Toru Nakamura, Kenji Kawano, Akinori Saeki, Yukihiro Kaneko, Taisuke Matsui
Summary: To enhance the light stability of lead-halide perovskite solar cells, a self-assembled monolayer (SAM) is introduced between the carrier transport layer and the perovskite layer. By combining a fullerene-functionalized SAM (C(60)SAM) and a suitable gap-filling SAM (GFSAM), both the photovoltaic conversion efficiency (PCE) and light stability are improved. The best cell with C(60)SAM and GFSAM exhibits a PCE of 18.68% and a retention rate of over 99% after a light stability test, and shows almost unchanged PCE after six months of outdoor exposure.
ACS APPLIED MATERIALS & INTERFACES
(2023)
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, Physical
Steffen M. Brulls, Valentina Cantatore, Pui Lam Tam, Per Malmberg, Elisabet Ahlberg, Itai Panas, Siegfried Eigler, Jerker Martensson
Summary: Functionalization and modulation of graphene's electronic properties using organic polycations were investigated. Wet-chemical non-covalent functionalization was performed on chemical vapor deposition graphene and reduced graphene oxide. The number of anions and the properties of the benzimidazole-based systems were found to play a crucial role in determining the redox properties and bonding to graphene. This study provides insights into the cooperative effects of the system's structure and anions on the binding affinity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Alex Henning, Johannes D. Bartl, Andreas Zeidler, Simon Qian, Oliver Bienek, Chang-Ming Jiang, Claudia Paulus, Bernhard Rieger, Martin Stutzmann, Ian D. Sharp
Summary: Atomic layer deposition (ALD) is a crucial tool in semiconductor device fabrication for precise control over thin film growth. However, challenges in creating continuous monolayers exist due to surface inhomogeneities and precursor steric interactions. This study demonstrates the encapsulation of c-plane gallium nitride with extremely thin aluminum oxide through ALD, offering new possibilities for controlling charge transport and tailoring surface chemistry in semiconductor devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Emanuela Schiliro, Raffaella Lo Nigro, Salvatore E. Panasci, Simonpietro Agnello, Marco Cannas, Franco M. Gelardi, Fabrizio Roccaforte, Filippo Giannazzo
Summary: The authors demonstrated the growth of highly homogeneous and ultrathin Al2O3 films with good insulating properties on monolayer MoS2 exfoliated on gold using atomic layer deposition. The study showed that the nucleation process of the high-k film is better on the 1L MoS2/Au system compared to common insulating substrates, and the density of Al2O3 on bilayer MoS2 is significantly reduced. Raman and photoluminescence spectroscopy indicated p-type doping and tensile strain in the MoS2 induced by the Au substrate after Al2O3 deposition.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Optics
Fabian Menges, Honghua Yang, Samuel Berweger, Anirban Roy, Tao Jiang, Markus B. Raschke
Summary: This study introduces photothermal force microscopy to image surface plasmon polaritons in monolayer graphene through non-radiative SiO2 substrate dissipation. The research demonstrates the real-space SPP imaging and attributes the force response to substrate dissipation-enhanced thermal expansion, showing that nano-optical tip-sample induced dissipative forces facilitate direct mechanical detection of surface polariton interactions with monolayer sensitivity.
Article
Chemistry, Multidisciplinary
Youness Kaddar, Wei Zhang, Hanna Enriquez, Yannick J. Dappe, Azzedine Bendounan, Gerald Dujardin, Omar Mounkachi, Abdallah El Kenz, Abdelilah Benyoussef, Abdelkader Kara, Hamid Oughaddou
Summary: Blue phosphorene, an allotrope of black phosphorene, exhibits Dirac fermions similar to graphene when grown on a Cu(111) surface. This suggests that high-speed electronic devices based on ballistic transport at room temperature could be achieved using blue phosphorene.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
K. W. B. Hunvik, B. Pacakova, S. Raaen
Summary: Adsorption and desorption of CO2 on metallic and oxidised Ni nano-structures supported on mica substrates were studied using temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Predominantly physisorption was observed at low temperatures, with weak desorption features found up to room temperature. More CO2 was adsorbed on oxidised Ni nanostructures compared to metallic structures, and a strong affinity for CO adsorption from ambient vacuum was observed on the nano-structures. An absence of strong dependence on Ni amount on CO2 adsorption was reported.
PHILOSOPHICAL MAGAZINE
(2021)
Article
Materials Science, Multidisciplinary
Sebastian Dahle, John Meuthen, Rene Gustus, Alexandra Prowald, Wolfgang Vioel, Wolfgang Maus-Friedrichs
Summary: The self-assembling films were used on pine wood substrates to alter surface wettability, with monodisperse polystyrene spheres deposited onto the substrate via dip coating. The resulting film had a polycrystalline FCC-like structure with typical domain sizes of 5-15 single spheres. Functionalization of this self-assembled coating through O-2 plasma treatment introduced hydroxyl and carbonyl groups, resulting in superhydrophilic behavior.
Article
Chemistry, Multidisciplinary
Shi Li, Hongru Zhang, Zheng Liu, Junquan Xu, Guofang Fan, Wei Li, Qi Li, Xiaodong Hu, Gaoshan Jing
Summary: Developing new metrology techniques is crucial in semiconductor fabrication to accurately measure film thickness and material properties. Highly uniform FDTS SAM film patterns were fabricated using conventional methods and investigated using AES and XPS techniques.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Anna L. Pellegrino, Cristina Tudisco, Francesca Lo Presti, Emil Milan, Adolfo Speghini, Guglielmo G. Condorelli, Graziella Malandrino
Summary: For the first time, a gas-phase route called molecular layer deposition (MLD) was used to create a monolayer of metalorganic Eu(III) molecules on a NiO oxide layer. The NiO layer was activated using H2O/O2 vapors and then functionalized with molecules of the Eu complex at different temperatures to promote the chemisorption process. The effects of activation process and MLD temperature on the chemisorption of the Eu complex were evaluated using X-ray photoelectron and luminescence spectroscopy. The research findings defined the stoichiometry of the chemisorbed Eu moiety and optimized a strategy for synthesizing hybrid metalorganic/inorganic systems. The luminescence properties of the hybrid system confirmed energy conversion phenomena of the monolayer and provided information about the local environment of the Eu(III) complex anchored on the NiO surface.
Meeting Abstract
Biophysics
Yan Yan, Sandip Kumar, Laura Finzi, David D. Dunlap
BIOPHYSICAL JOURNAL
(2015)
Meeting Abstract
Biophysics
Sandip Kumar, David G. Priest, Yan Yan, Ian B. Dodd, Keith E. Shearwin, David D. Dunlap
BIOPHYSICAL JOURNAL
(2015)
Article
Chemistry, Multidisciplinary
Sandip Kumar, Michael L. Cartron, Nic Mullin, Pu Qian, Graham J. Leggett, C. Neil Hunter, Jamie K. Hobbs
Meeting Abstract
Biophysics
Sandip Kumar, Chiara Zurla, Sachin Goyal, Laura Finzi, David Dunlap
BIOPHYSICAL JOURNAL
(2012)
Meeting Abstract
Biophysics
Sandip Kumar, David Priest, Yoav Biton, David Swigon, Keith Shearwin, Ian Dodd, David Dunlap
BIOPHYSICAL JOURNAL
(2013)
Article
Biophysics
Sandip Kumar, Carlo Manzo, Chiara Zurla, Suleyman Ucuncuoglu, Laura Finzi, David Dunlap
BIOPHYSICAL JOURNAL
(2014)
Article
Genetics & Heredity
Yu-Cheng Tsai, Yuzhen Wang, Damian E. Urena, Sandip Kumar, Junghuei Chen
Article
Multidisciplinary Sciences
Yoav Y. Biton, Sandip Kumar, David Dunlap, David Swigon
Article
Multidisciplinary Sciences
David G. Priest, Lun Cui, Sandip Kumar, David D. Dunlap, Ian B. Dodd, Keith E. Shearwin
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2014)
Article
Multidisciplinary Sciences
David G. Priest, Sandip Kumar, Yan Yan, David D. Dunlap, Ian B. Dodd, Keith E. Shearwin
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2014)
Article
Microbiology
Connor Sharp, Christine Boinett, Amy Cain, Nicholas G. Housden, Sandip Kumar, Keith Turner, Julian Parkhill, Colin Kleanthous
JOURNAL OF BACTERIOLOGY
(2019)
Article
Multidisciplinary Sciences
L. Pasquina-Lemonche, J. Burns, R. D. Turner, S. Kumar, R. Tank, N. Mullin, J. S. Wilson, B. Chakrabarti, P. A. Bullough, S. J. Foster, J. K. Hobbs
Article
Chemistry, Analytical
Alison O. Nwokeoji, Sandip Kumar, Peter M. Kilby, David E. Portwood, Jamie K. Hobbs, Mark J. Dickman
Meeting Abstract
Chemistry, Multidisciplinary
Sandip Kumar, Junghuei Chen
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2009)
Article
Chemistry, Physical
Erhao Gao, Wenjing Feng, Qi Jin, Li Han, Yi He
Summary: The influence of K-doping on the reactive oxygen species and elementary reactions of HCHO catalytic oxidation was investigated using density functional theory (DFT). The introduction of K-doping changed the electronic structures of Ce and O, facilitating the adsorption and activation of HCHO and O2 molecules, enhancing lattice oxygen mobility, and reducing the energy barrier for HCHO oxidation. K-doping also promoted the formation of hydroxyl groups, facilitating HCHO adsorption and oxidation.
Article
Chemistry, Physical
Hao Fu, Zhangliang Xu
Summary: In this study, the adsorption mechanisms and detection performance of formaldehyde, ammonia, and sulfur dioxide on undoped and metal-doped ZnO surfaces were investigated using density functional theory. The results showed that formaldehyde and ammonia were physically adsorbed on the undoped ZnO surface, while sulfur dioxide was weakly chemisorbed. The adsorption energy was enhanced when ZnO was doped with metals. These findings provide theoretical guidance for the application of ZnO substrate materials in gas sensitivity research.
Article
Chemistry, Physical
Atsushi Nomura, Tohru Kurosawa, Migaku Oda, Satoshi Demura, Shogo Kuwahara, Sora Kobayashi, Hideaki Sakata
Summary: The study investigates the tunneling spectra of 1T-TiSe2 in the CDW state and the dip structure below the Fermi level, aiming to determine whether this dip is a CDW gap. The answer to this question is crucial for understanding the driving mechanism of CDW.
Article
Chemistry, Physical
A. S. Petrov, D. I. Rogilo, A. I. Vergules, V. G. Mansurov, D. V. Sheglov, A. V. Latyshev
Summary: This study investigates Si mass transport and morphological transformations on the Si(111) surface during (root 3 x root 3)-Sn reconstruction formation and Si homoepitaxy. The research shows that the formation of different Sn phases at different temperatures affects the Si island nucleation and monatomic step shift, which in turn impact the morphology of the Sn/Si(111) interface. Electromigration-induced drift of disordered Sn domains leads to enhanced noncompensated Si mass transport and surface roughening.
Article
Chemistry, Physical
D. V. Gruznev, L. V. Bondarenko, A. Y. Tupchaya, A. A. Yakovlev, A. N. Mihalyuk, A. V. Zotov, A. A. Saranin
Summary: Deposition of thallium (Tl) onto the Au/Si(111)5 x 2 reconstruction followed by annealing results in the formation of a surface structure with 4 x 2 periodicity. The immiscibility of Au and Tl leads to the migration of Tl atoms over the Si chains. Thallium donates electrons to the surface, converting the metallic surface into an insulating state and altering the inter-chain distance within the array of Au atomic wires.
Article
Chemistry, Physical
Simone Giusepponi, Francesco Buonocore, Barbara Ferrucci, Massimo Celino
Summary: Using ab-initio calculations, the interaction between lead adatom and both clean and doped iron (100) surfaces was investigated. It was found that the lead adatom prefers to adsorb in the hollow site, which is more stable compared to the top and bridge sites, and in this position, it is energetically favorable over the iron adatom. Moreover, lead adsorbed in the hollow site of the iron (100) surface doped with chromium was found to create a more stable system compared to nickel-doped surfaces with an iron adatom in the same position. The study also explored inter-layer distances, bonding mechanisms, magnetic behaviors, and charge density differences. The results provide insights into the role of doping in the interaction between lead adatom and iron surface, and have implications for the analysis of corrosion processes caused by liquid lead.
Article
Chemistry, Physical
Shuo Zhang, Jin-Ho Choi
Summary: The recent synthesis of two-dimensional layered WSi2N4 has attracted attention due to its potential applications. This study investigates the catalytic performance of WSi2N4 monolayers with nitrogen vacancies in the hydrogen evolution reaction using first-principles calculations. The results show that the defective WSi2N4 monolayers exhibit remarkably high catalytic activity comparable to platinum catalysts. Electronic structure calculations also reveal the emergence of spin-polarized states due to the introduction of nitrogen vacancies.
Article
Chemistry, Physical
Xiaoyan Yu, Xin Cao, Wei Kang, Shanhua Chen, Ao Jiang, Yuhao Luo, Wenwei Deng
Summary: First-principles calculations were used to investigate the electronic properties of a TiO2 heterostructure modified with Bi2Te3 co-catalyst. The study revealed that the Bi2Te3/TiO2 interface introduced optimal band offsets, effectively suppressing electron-hole recombination and enhancing the utilization efficiency of photo-generated carriers. Additionally, the Bi2Te3 co-catalyst introduced extra catalytic active sites, further boosting the photo-catalytic hydrogen evolution efficiency.
Article
Chemistry, Physical
Filippo Longo, Emanuel Billeter, Selim Kazaz, Alessia Cesarini, Marin Nikolic, Aarati Chacko, Patrik Schmutz, Zbynek Novotny, Andreas Borgschulte
Summary: Alkaline water electrolysis is a simple and efficient method for renewable hydrogen production, utilizing cheap and abundant transition metals. The catalytic properties of Ni materials are enhanced by the formation of oxidized compounds on the surface. The high electrocatalytic activity of Ni (oxy)-hydroxides is directly related to water intercalation in the passivation layer, supporting the hypothesis of a water mediated OH- diffusion mechanism. The self-organization of the surface structure during passivation layer formation enables high electrode performance.
Article
Chemistry, Physical
Mohan Kumar Kuntumalla, Miriam Fischer, Alon Hoffman
Summary: By investigating the bonding, retention, and thermal stability of nitrogen in H-Diamond (100), it was found that nitrogen can partially recover its bonding with carbon atoms after high-temperature annealing, indicating a high thermal stability of nitrogen in diamond.
Article
Chemistry, Physical
Dong Yue, Liangying Wen, Rong Chen, Jianxin Wang, Zhongqing Yang
Summary: The adsorption behavior of Cl2 molecules on the TiC surface and the formation and transfer of reaction products were studied using first-principles ab initio calculations. The results show that the Cl atoms bonded to the surface Ti atoms are more stable, and the TiCl3 intermediate is easier to form than the TiCl2 intermediate.
Article
Chemistry, Physical
Yatao Wang, Peng Zhang, Hongjuan Li, Qiuju Xu, Shujun Liu, Xiaopeng Liu, Xuehua Guo, Yitao Li, Jinzhang Liu, Sen Dong, Zhi Wei Seh, Qianfan Zhang
Summary: In this study, the adsorption performance of two types of metal-organic frameworks (MOFs) for thiophene and benzene was experimentally investigated. The results showed that IZE-1 exhibited high selectivity and superior adsorption capacity for thiophene, especially at low concentrations. First-principles calculations and molecular dynamics simulations provided insights into the mechanism of thiophene adsorption and the high selectivity observed. This research demonstrates the potential of MOFs for thiophene adsorption, particularly at high concentrations.