Article
Nanoscience & Nanotechnology
Thomas Auzelle, Florian Ullrich, Sebastian Hietzschold, Chiara Sinito, Stefan Brackmann, Wolfgang Kowalsky, Eric Mankel, Oliver Brandt, Robert Lovrincic, Sergio Fernandez-Garrido
Summary: The optoelectronic properties of GaN surfaces were studied after functionalization with phosphonic acid derivatives, showing significant changes in GaN work function and impacting surface band bending. The internal quantum efficiency of GaN layers and nanowires was significantly affected by the covalent bonding of phosphonic acids, with modifications to internal electric fields and surface states. Phosphonate chemistry shows potential for selective sensing applications in surface functionalization of GaN.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Ming Chu, Jie Zhang, Xingwei Zeng, Zefeng Chen, Danqing Liu, Han Chen, Zuowei Xie, Jianbin Xu, Qian Miao
Summary: Molecules of 12-o-carboranyldodecylphosphonic acid can form a novel self-assembled monolayer on alumina, effectively tuning charge carriers in organic field effect transistors by assembling dipoles at the semiconductor-dielectric interface. This SAM enables p-channel OFETs of pentacene and ambipolar charge transport in n-type organic semiconductors like chlorinated tetraazapentacene, while the surface electrostatic potential of the SAM correlates with the observed shift of threshold voltage in OFETs.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Ruttapol Malatong, Takuro Sato, Jakkapan Kumsampao, Taketoshi Minato, Masayuki Suda, Vinich Promarak, Hiroshi M. Yamamoto
Summary: This study addresses the challenges of spin controllability, durability, and spin-polarization efficiency in chiral-induced spin selectivity (CISS) by developing a self-assembled monolayer (SAM) of overcrowded alkene (OCA)-based molecular motor. It is demonstrated that the direction of spin polarization can be externally and repeatedly manipulated by switching the molecular chirality, and a higher stereo-ordering architecture of the SAM of OCAs enhances the efficiency of spin polarization. These findings provide a credible feasibility study for the development of CISS-based spintronic devices.
Article
Nanoscience & Nanotechnology
Julien Gay, Agata Lachowicz, Nicolas Blondiaux, Gaelle A. L. Andreatta
Summary: This study presents a method for nickel and copper electroplating on solar cells using phosphonic acid self-assembled monolayers as masks. The chemical functionalization and deposition method of phosphonic acid were found to strongly influence the masking properties, and the binding modes of phosphonic acid were investigated using attenuated total reflectance Fourier transform infrared spectroscopy.
ACS APPLIED NANO MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Limin Wang, Ulrich S. Schubert, Stephanie Hoeppener
Summary: Surface modification using self-assembled monolayers has seen significant advancement in the past decade, with the introduction of new chemical reactions such as nucleophilic substitution, click chemistry, supramolecular modification, photochemical reaction, and others, enhancing the properties of solid substrates like silicon and glass.
CHEMICAL SOCIETY REVIEWS
(2021)
Review
Chemistry, Physical
Piotr Cyganik, Andreas Terfort, Michael Zharnikov
Summary: Self-assembled monolayers (SAMs) are an important tool in nanofabrication and molecular engineering, with their properties depending on the tail groups and structure. The odd-even effects play a significant role in SAMs and can be observed in different materials, influencing the packing density and orientation of the SAM-forming molecules.
Article
Materials Science, Multidisciplinary
Abdesselam Jedaa, Khadija Elmenaouar
Summary: The study investigates the geometrical structure of alkylphosphonic acid molecules on the alpha-Al2O3 surface, revealing a dependence on chain length and interactions between molecules. The mixed model helps understand the ordering of molecules and interactions between different chain lengths. Understanding these interactions can aid in predicting applications in organic devices.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Gaelle Anne Leonie Andreatta, Nicolas Blondiaux, Julien Gay, Samuel Unterhofer, Agata Lachowicz, Antonin Faes
Summary: This article reports the fabrication of gemini perfluorinated phosphonic acids SAMs on indium tin oxide (ITO) for patterning nickel lines on heterojunction solar cells. Two deposition methods and the effects of solvents were compared, with surface properties characterized by various methods.
Article
Nanoscience & Nanotechnology
Baolin Zhao, Bastian Gothe, Arthur Groh, Thomas Schmaltz, Johannes Will, Hans-Georg Steinrueck, Tobias Unruh, Stefan Mecking, Marcus Halik
Summary: This study demonstrates the use of phosphonic acid oligomers in self-assembled monolayer field-effect transistors, showing increased mobility in devices by controlling the thiophene unit counts. X-ray techniques reveal the molecular-scale packing and order of SAMs with different chain lengths.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Electrochemistry
Jie Shi, Feng Jiang, Shichuan Long, Zhixing Lu, Tianshuo Liu, Haining Zheng, Jia Shi, Yang Yang, Wenjing Hong, Zhong-Qun Tian
Summary: Eutectic Gallium-Indium (EGaIn) is a promising technique for fabricating self-assembled monolayers (SAMs)-based molecular devices, but previous measurements revealed abnormal signals, such as offset zero-bias current. A new automatic instrument platform was built to systematically study the electrical behavior of SAMs, showing that ambient water affects charge transport through molecular junctions and can cause offset of zero-bias current.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Patrick D. Coan, Carrie A. Farberow, Michael B. Griffin, J. Will Medlin
Summary: The study shows that thiol modifiers inhibit ring hydrogenation activity of Pd/Al2O3 catalysts, while phosphonic acid (PA) modifiers enhance hydrogenation of furfuryl alcohol. Thiol modifiers mainly block active sites, whereas PA modifiers stabilize product states through hydrogen-bonding interactions with surface intermediates derived from the reactants.
Article
Chemistry, Physical
S. M. Sattari-Esfahlan, Eun-Cheol Lee, Chang-Hyun Kim
Summary: This study delves into the synergistic effects of electrode and dielectric SAMs on the behavior of solution-processed organic field-effect transistors, providing fundamental insights into chemically modified OFETs. By utilizing a self-consistent device model to robustly treat the measured electrical characteristics of the OFETs, reliable material, interface, morphology, and transport parameters are obtained and correlated to build a comprehensive understanding on trap energy and injection-transport relationship.
Article
Chemistry, Physical
Tomohiro Shirai, Satoshi Yamauchi, Hikari Kikuchi, Hiroki Fukumoto, Hiroto Tsukada, Tomohiro Agou
Summary: A novel phosphonic acid with a vinylene-bridged fluoroalkyl chain was synthesized and characterized, showing high uniformity, lower surface energy, and lower contact angle hysteresis on metal oxide surfaces. This compound also allowed for rapid surface modification of metal oxide surfaces and exhibited superior thermal stability compared to traditional fluorinated phosphonic acids.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Yangbiao Liu, Egbert Zojer, Michael Zharnikov
Summary: Self-assembled monolayers (SAMs) of ferrocene-substituted thiofluorene on Au(111) exhibit two distinct conductance states (CSs) with high rectification ratio (RR). The CSs and RR depend on the bias voltage sweep direction, with the high CS preserved under negative bias and switched to low CS under positive bias. In symmetric sweeps, the CS depends on the polarity of the first sweep.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ming Chen, Jie Li, Yingzhe Piao, Wanli Yang, Chun Li, Yi Wan, Yanhao Yu, Lain-Jong Li, Xugang Guo, Xing Cheng
Summary: The surface functionalization using self-assembled monolayers (SAMs) improves the growth of organic semiconductors and reduces interfacial traps, leading to high-performance organic thin-film transistors (OTFTs). By optimizing the deposition conditions, it is found that SAMs deposited from vapor phase at a temperature of 120 degrees C and pressure of 0.02 bar exhibit no morphological defects. The defect-free SAMs show ultrasmooth surfaces and can be scaled up to wafer size. OTFTs with defect-free SAMs achieve an average mobility of 1.79 cm(2) V(-1)s(-1), outperforming devices with defective SAMs and advancing large-area and high-performance organic electronics.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Belen Lerma-Berlanga, Carolina R. Ganivet, Neyvis Almora-Barrios, Sergio Tatay, Yong Peng, Josep Albero, Oscar Fabelo, Javier Gonzalez-Platas, Hermenegildo Garcia, Natalia M. Padial, Carlos Marti-Gastaldo
Summary: Metal-Organic Frameworks are used as crystalline matrices to synthesize multiple component or multivariate solids, allowing for property customization. By optimizing synthesis through high-throughput methods, it is possible to create multivariate frameworks with efficient light sensitization, chemical stability, and porosity for photocatalysis applications. Solvent-assisted linker exchange reactions can control the distribution of linkers in crystals, affecting their performance in photocatalytic activities.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Elena Lopez-Maya, Natalia M. Padial, Javier Castells-Gil, Carolina R. Ganivet, Ana Rubio-Gaspar, Francisco G. Cirujano, Neyvis Almora-Barrios, Sergio Tatay, Sergio Navalon, Carlos Marti-Gastaldo
Summary: The study demonstrates how the different affinity of metal sites can be utilized for selective grafting of molecules, allowing for cooperative reactions between Lewis acid titanium centers and available -NH sites in the framework. This approach provides a method for controlling the positioning and distribution of chemical functions in precise locations for cooperative reactions of epoxides and CO2.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Nanoscience & Nanotechnology
Pierre Brus, Victor Zatko, Marta Galbiati, Florian Godel, Sophie Collin, Bernard Servet, Stephane Xavier, Raphael Aubry, Patrick Garabedian, Marie-Blandine Martin, Bruno Dlubak, Pierre Seneor, Odile Bezencenet
Summary: This study evaluated a large-scale manufacturing/passivation process for large area monolayers of MoS₂ and achieved a series of results beneficial for the application of 2D TMDCs in RF devices.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Victor Zatko, Simon Mutien-Marie Dubois, Florian Godel, Cecile Carretero, Anke Sander, Sophie Collin, Marta Galbiati, Julian Peiro, Federico Panciera, Gilles Patriarche, Pierre Brus, Bernard Servet, Jean-Christophe Charlier, Marie-Blandine Martin, Bruno Dlubak, Pierre Seneor
Summary: This study presents a growth process utilizing pulsed laser deposition to create large-scale complex van der Waals heterostructures at a high temperature, demonstrating the successful construction of multilayer stacks in a single run with high homogeneity. The structural preservation achieved through continuous in situ growth allows even the most fragile 2D layers to remain intact when encapsulated in van der Waals heterostructures.
Article
Physics, Applied
B. Quinard, F. Godel, M. Galbiati, V Zatko, A. Sander, A. Vecchiola, S. Collin, K. Bouzehouane, F. Petroff, R. Mattana, M-B Martin, B. Dlubak, P. Seneor
Summary: By using atomic layer deposition (ALD), a ferromagnetic cobalt electrode was successfully grown and demonstrated as a functional spin source. The research shows that the ALD-grown cobalt layer has metallic properties and ferromagnetism, with high surface flatness and uniform conductivity, suitable for spintronics applications.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Belen Lerma-Berlanga, Carolina R. Ganivet, Neyvis Almora-Barrios, Rebecca Vismara, Jorge A. R. Navarro, Sergio Tatay, Natalia M. Padial, Carlos Marti-Gastaldo
Summary: The value of covalent post-synthetic modification in expanding the chemistry and pore versatility of reticular solids is well documented. In this study, tetrazine connectors were used to demonstrate the value of all-purpose inverse electron-demand Diels-Alder ligation chemistry, generating multiple pore environments with diverse chemical functionalities and accessible porosities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Victor Zatko, Simon M. -M. Dubois, Florian Godel, Marta Galbiati, Julian Peiro, Anke Sander, Cecile Carretero, Aymeric Vecchiola, Sophie Collin, Karim Bouzehouane, Bernard Servet, Frederic Petroff, Jean-Christophe Charlier, Marie-Blandine Martin, Bruno Dlubak, Pierre Seneor
Summary: This study reports on the significant spin-filtering effects in epitaxial graphene-based spin valves, particularly enhanced in the case of multilayer graphene. The combination of chemical vapor deposited multilayer graphene with high-quality epitaxial Ni(111) ferromagnetic spin source led to the obtained results. Complete nanometric spin valve junctions were fabricated using a local probe indentation process, and spin properties were extracted from the graphene-protected ferromagnetic electrode using a reference Al2O3/Co spin analyzer. The study discusses the emerging physical picture of graphene-ferromagnet systems and provides insight into the efficient spin filtering effects and the interfacial matching of the graphene layers with the spin-polarized Ni surface, showcasing the potential of low Resistance-Area (RA) graphene interfaces in spin-based devices.
Article
Physics, Applied
Alicia Forment-Aliaga, Alejandro Gaita-Arino
Summary: This Perspective article provides a brief overview of the current state of hybrid molecular spintronics and smart molecular spintronics materials, discussing the role of chirality induced spin selectivity effect and potential applications of magnetic biomolecules and chemical modification of 2D materials.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ana Rubio-Gaspar, Sergio Navalon, Sergio Tatay, Francisco G. Cirujano, Carmen Fernandez-Conde, Natalia M. Padial, Carlos Marti-Gastaldo
Summary: Compared to indirectly modifying the framework, synthetic control of cluster composition allows direct access to catalytic activities without specific metal combinations. In this study, the aminolysis reaction of epoxides was tested using isostructural mesoporous frameworks with five combinations of homometallic and heterobimetallic metal-oxo trimers (Fe3, Ti3, TiFe2, TiCo2, and TiNi2). Only the TiFe2 nodes displayed activities comparable to benchmark catalysts based on grafting of strong acids, which arise from the combination of Lewis Ti4+ and Bronsted Fe3+-OH acid sites. The applicability of MUV-101(Fe) in the synthesis of beta-amino alcohols was demonstrated, including the gram-scale synthesis of propranolol, a natural beta-blocker listed as an essential medicine by the World Health Organization, with excellent yield and selectivity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Victor Zatko, Regina Galceran, Marta Galbiati, Julian Peiro, Florian Godel, Lisa-Marie Kern, David Perconte, Fatima Ibrahim, Ali Hallal, Mairbek Chshiev, Benjamin Martinez, Carlos Frontera, Lluis Balcells, Piran R. Kidambi, John Robertson, Stephan Hofmann, Sophie Collin, Frederic Petroff, Marie-Blandine Martin, Bruno Dlubak, Pierre Seneor
Summary: 2D materials can be manipulated by proximity effects to modify their electronic structure, allowing for the creation of unique properties in interfaces and heterostructures. In this study, we investigate the possibility of using a ferromagnetic insulator-graphene electrode to design a magnetic tunnel junction. Through the observation of tunnel magnetoresistance, we confirm the emergence of spin polarization in proximitized graphene layers, which is induced by a spin-dependent splitting of the Dirac band structure. This opens up opportunities for utilizing 2D quantum materials in spintronics applications, such as memory cells and logic circuits.
Article
Chemistry, Multidisciplinary
Belen Lerma-Berlanga, Natalia M. Padial, Marta Galbiati, Isaac Brotons-Alcazar, Josep Albero, Hermenegildo Garcia, Alicia Forment-Aliaga, Carolina R. Ganivet, Carlos Marti-Gastaldo
Summary: The presence of tetrazine units in the organic nodes of UiO-68-TZCD controls the formation of ultrathin coatings of single-wall nanotubes that decorate the surface of the crystal. These crystal hybrids can be prepared straightforwardly in one step and exhibit exceptional stability in water, high surface areas, and good conductivity even at low carbon weight contents.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Luis Leon-Alcaide, Rasmus S. Christensen, David A. Keen, Jose L. Jorda, Isaac Brotons-Alcazar, Alicia Forment-Aliaga, Guillermo Minguez Espallargas
Summary: We describe the synthesis, phase transformations, and melting properties of the first meltable iron-based zeolitic imidazolate framework (ZIF), known as MUV-24. It is obtained through thermal treatment of [Fe3(im)6(Him)2], resulting in the formation of Fe(im)2. Upon further heating, different crystalline phase transformations are observed, until the material melts at 482 degrees C. Cooling of the liquid phase leads to the formation of the first Fe-metal-organic framework glass.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Marta Galbiati, Fernando Ramiro-Manzano, Jose Joaquin Perez Grau, Fernando Cantos-Prieto, Jaume Meseguer-Sanchez, Ivona Kosic, Filippo Mione, Ana Pallares Vilar, Andres Cantarero, David Soriano, Efren Navarro-Moratalla
Summary: By using hyperspectral wide-field imaging, researchers revealed a nonmonotonic thickness dependence of the optical properties in magnetic 2D material CrI3. This finding sheds light on the structural conundrum and offers insights into mesoscopic effects in layered materials and light-matter interactions in magnetic 2D materials.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Isabel Abanades Lazaro, Neyvis Almora-Barrios, Sergio Tatay, Catalin Popescu, Carlos Marti-Gastaldo
Summary: Defect engineering is important for tuning the properties of metal-organic frameworks, with a focus on the preferential formation of missing cluster defects in heterometallic titanium-organic frameworks. Integration of experimental work, computational modeling, and thorough characterization helps rationalize the impact of defects on the porosity and structure of materials. Synchrotron X-ray diffraction reveals the dominance of missing cluster vacancies in defective structures, while high-resolution electron microscopy methods are needed to model nanoscale disorder in titanium MOFs.
Article
Chemistry, Multidisciplinary
Maria Romero-Angel, Javier Castells-Gil, Victor Rubio-Gimenez, Rob Ameloot, Sergio Tatay, Carlos Marti-Gastaldo
Summary: By using dodecanoic acid as a modulator, we are able to achieve good control over the size and colloid stability of titanium MOF nanoparticles, while minimizing the impact on the framework's properties, enabling the direct fabrication of crystalline, porous thin films.
CHEMICAL COMMUNICATIONS
(2021)
