Article
Chemistry, Multidisciplinary
Wei-Qiang Liao, Bin-Bin Deng, Zhong-Xia Wang, Ting-Ting Cheng, Yan-Ting Hu, Shu-Ping Cheng, Ren-Gen Xiong
Summary: SA-PFA is an organic molecular ferroelectric material with light-triggered reversible structural changes, showing clear ferroelectricity and optically induced ferroelectric polarization switching behavior. The reversible photoisomerization effect of SA-PFA enables potential application in light-controlled ferroelectric devices.
Review
Chemistry, Physical
Jorn D. Steen, Daniel R. Duijnstee, Wesley R. Browne
Summary: Molecular switching has become a key functionality in addressable materials and surfaces. However, the wide variation in interfaces studied, from single-molecule devices to two-dimensional self-assembled monolayers and thin films, poses challenges in their use and characterization. The low number density of molecules on modified interfaces and the complexity of characterizing molecular function further complicate the analysis. This review discusses the techniques and approaches used for characterizing molecular switches applied to interfaces and emphasizes the importance of understanding the limitations and quirks of specific techniques through the use of model compounds.
SURFACE SCIENCE REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Liang Fei, Weidong Yu, Zonghuai Wu, Yunjie Yin, Kasper Moth-Poulsen, Chaoxia Wang
Summary: Leuco dye-based thermochromic materials have great potential for visible molecular logic due to their reversible color-changing effect. However, controlling the bistable color function at the desired temperature is still a challenge. By designing a series of azobenzenes with different alkyl chains, protonation competition with the leuco dye can be achieved, allowing for the locking and releasing of the color developer. This optically controlled leuco dye-based system demonstrates visible sequential logic operations and provides a new type of protonation-based optical control.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Junta Igarashi, Wei Zhang, Quentin Remy, Eva Diaz, Jun-Xiao Lin, Julius Hohlfeld, Michel Hehn, Stephane Mangin, Jon Gorchon, Gregory Malinowski
Summary: The authors demonstrate ultrafast magnetization reversal induced by light in rare-earth-free spin valves of [Pt/Co]/Cu/[Co/Pt] within a picosecond. The discovery of spin-transfer torque (STT) allowed the control of magnetization direction in nanoseconds using electrical current. Ultrashort optical pulses have been used to manipulate the magnetization of ferrimagnets in picoseconds by driving the system out of equilibrium. In this study, the authors show ultrafast magnetization reversal induced by light in commonly used [Pt/Co]/Cu/[Co/Pt] spin valves for STT switching, bridging concepts from spintronics and ultrafast magnetism.
Review
Chemistry, Physical
Hiroshi Masuhara, Ken-ichi Yuyama
Summary: Intense 1,064-nm continuous-wave laser tightly focused at solution surfaces exert optical force on molecules, polymers, and nanoparticles, leading to a variety of phenomena such as crystallization, nanoparticle assembly, and gold nanoparticle swarming. These phenomena, known as optically evolved assembling at solution surfaces, are elucidated in terms of dynamics and mechanisms in this study.
ANNUAL REVIEW OF PHYSICAL CHEMISTRY, VOL 72
(2021)
Article
Chemistry, Inorganic & Nuclear
Zhinan Zhang, Haiming Cheng, Shiyong Teng, Keke Huang, Dayang Wang, Wensheng Yang, Renguo Xie
Summary: This paper introduces a metal halide hybrid material that exhibits thermally induced fluorescence transition, and successfully fabricates a thermochromic material with reversible and lower transition temperatures. Through the study of an organic-inorganic lead chloride hybrid crystal, it is found that the emission of the crystal changes from green to blue light when heated, and the transition process is verified by various experimental methods. In addition, this material has excellent cycling stability and low transition temperature, which is expected to be applied in the fields of anti-counterfeiting and information encryption.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Zixi He, Zhengdong Liu, Bin Liu, Kaili Wang, Xuemei Dong, Zicheng Zhang, Chen Chen, Min Wang, Juqing Liu, Wei Huang
Summary: This study successfully developed thermochromic ionogels with broad response range and excellent cyclic stability through photopolymerization. The phase fusion temperature of the ionogels can be accurately controlled by adjusting the composition of the material. These ionogels demonstrate exceptional stability and are suitable for reversible information encryption devices.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Optics
Gil M. Fernandes, Ana M. Rocha, Margarida Facao
Summary: This study demonstrates that OLPG is a specific case of BS-FWM, proposing a vector model for analyzing the energy transfer induced by OLPGs within the inter-modal BS-FWM framework. It is shown that the bandwidth of OLPGs exceeds that of BS-FWM. Additionally, it is illustrated that mode switching based on OLPG can occur in specific windows, with the central wavelength and bandwidth of these windows being tunable by adjusting the wavelength and optical power of the pump beams.
Article
Materials Science, Multidisciplinary
G. P. Zhang, Y. H. Bai, Thomas F. George
Summary: This study proposes a method to inject angular momentum into a molecular crystal C-60 using a single laser pulse, with potential applications in controlling electronic spin and harvesting thermal energy. The findings show that changing the helicity of the laser pulse switches the direction of phonon angular momentum, providing a new pathway for generating angular momentum in fullerenes.
Article
Materials Science, Multidisciplinary
Yuan Tian, M. Shoufie Ukhtary, Riichiro Saito
Summary: The study investigates the time response of optically generated spin current at the graphene edge for potential applications in optospintronic devices. Spin current is generated by optically excited edge plasmon inducing electric field rotation on the graphene plane, leading to magnetization perpendicular to the plane through the inverse Faraday effect.
Article
Engineering, Electrical & Electronic
Ryunosuke Takahashi, Takuo Ohkochi, Daisuke Kan, Yuichi Shimakawa, Hiroki Wadati
Summary: Using a magneto-optical Kerr effect (MOKE) microscope, we observed laser-induced magnetization switching in ferrimagnetic oxide NiCo2O4 (NCO) epitaxial thin films with perpendicular magnetic anisotropy. Laser pulses at 1030 nm were used to irradiate the NCO thin film at different temperatures (300-400 K) while altering the parameters of pulse interval, fluence, and the number of pulses in the absence of an external magnetic field. We observed accumulative all-optical helicity-dependent switching above 380 K. Our observation of oxide NCO thin films facilitates magnetization switching using ultrafast lasers without the need for a magnetic field.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Optics
Jiaze Wu, Youlun Ju, Xiaoming Duan, Renpeng Yan, Yu Ding, Dong Yan, Yuechu Wu, Tongyu Dai, Jiawei Fan
Summary: We demonstrated a high peak power electro-optically Q-switched Ho:GdVO4 laser directly pumped by a 1.94 μm laser diode. The laser achieved a maximum output power of 6.5 W in continuous-wave mode and a pulse energy of 3.25 mJ in pulse mode. This is the first demonstration of such a laser with these characteristics.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
P. S. Krstic, E. T. Ostrowski, S. Dwivedi, A. Maan, S. Abe, A. C. van Duin, B. E. Koel
Summary: By using atomistic computational methods, the sputtering, reflection, and retention processes on amorphous and crystalline lithium hydride surfaces under the impact of low energy (1-100 eV) hydrogen and deuterium atoms were investigated. Classical molecular dynamics simulations were performed with improved reactive bond-order force field (ReaxFF) potentials, which include long-range polarization effects. The study revealed the importance of hydrogen saturation on the surface and near-surface region of the Li material, and how it significantly affects the surface processes under low-energy hydrogen irradiation.
FRONTIERS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Kun Ding, Daigo Oue, C. T. Chan, J. B. Pendry
Summary: The research shows that surface distortion asymmetrically splits surface plasmon energy and leads to a decrease in zero-point energy; conformal mapping can be used to demonstrate this splitting phenomenon; surface corrugation of metallic surfaces typically results in a decrease in zero-point energy, but usually not strong enough to independently drive surface reconstruction.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Amir Handelman, Igor Lapsker, Avi Jacob, Alexander Laikhtman
Summary: The study proposes using the polar amino acid L-histidine as a material for bio-photonic devices and discovers its ability to self-assemble into microstructures with passive waveguiding capability of polarized light. The linear birefringence of histidine microplates is estimated using the theory of biaxial crystals, showcasing its potential value in biophotonic applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Arnulf Stein, Daniela Rolf, Christian Lotze, Benjamin Gunther, Lutz H. Gade, Katharina J. Franke, Petra Tegeder
Summary: Efficient charge injection at organic semiconductor/metal interfaces is crucial for organic field effect transistors. Hybrid band formation between electronic states of the organic compound and the metal electrode facilitates effective charge injection. Investigation on a long-range ordered monolayer of a flat-lying N-heteropolycyclic aromatic compound on Au(111) reveals dispersing occupied and unoccupied interfacial hybrid bands, with energy level alignment and dispersion relations determined using angle-resolved two-photon photoemission. The band formation is suggested to proceed via hybridization of localized occupied molecular state with d-bands of Au substrate, resulting in significantly reduced effective mass and an even smaller effective mass for unoccupied molecular state hybridizing with Au sp-band.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Christoph P. Theurer, Ana M. Valencia, Julian Hausch, Clemens Zeiser, Vipilan Sivanesan, Caterina Cocchi, Petra Tegeder, Katharina Broch
Summary: This study investigated the photophysics of organic charge transfer complexes formed by tetracene with two different compounds using experimental and computational methods, revealing that the photophysics of these complexes are mainly influenced by the sub-picosecond relaxation of excitons back to the ground state. In mixtures, singlet fission of tetracene was suppressed and reduced lifetimes of tetracene, singlet and triplet excitons were found in blends with excess tetracene.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Mohsen Ajdari, Felix Landwehr, Marvin Hoffmann, Hendrik Hoffmann, Uwe H. F. Bunz, Andreas Dreuw, Petra Tegeder
Summary: The study focused on the structural and electronic properties of naphthothiadiazole (NTD) derivatives adsorbed on Au(111) in monolayer and thin films, revealing that in the monolayer and multilayer coverage regime, the NTD derivatives adsorbed in a planar fashion with the optical gap reduced due to halogenation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Christoph P. Theurer, Antonia Weber, Martin Richter, Markus Bender, Patrick Michel, Debkumar Rana, Krishan Kumar, Uwe Bunz, Marcus Scheele, Petra Tegeder, Frank Schreiber, Katharina Broch
Summary: Hybrid organic-inorganic nanomaterials, which combine organic semiconductors and inorganic quantum dots, show promise for opto-electronic devices in a sustainable internet of things. However, the lack of understanding of the organic-inorganic interface has been a major challenge in widespread device applications. By studying a specific system, the short-range organization and binding motif of aryleneethynylenes coupled to CdSe QDs, we have made advancements in understanding this interface and identified the incorporation of the organic ligands in between the inorganic QDs.
Article
Chemistry, Physical
Marvin Hoffmann, Mohsen Ajdari, Felix Landwehr, Olena Tverskoy, Uwe H. F. Bunz, Andreas Dreuw, Petra Tegeder
Summary: This study investigated the structural and electronic properties of N-heteropolycyclic aromatic compounds adsorbed on a gold surface using vibrational and electronic spectroscopy. The results showed that these compounds adsorb in a planar geometry and the introduction of nitrogen atoms significantly enhances the intensity of the alpha-band in the UV/vis absorption spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ina Michalsky, Viktoria Gensch, Christian Walla, Marvin Hoffmann, Frank Rominger, Thomas Oeser, Petra Tegeder, Andreas Dreuw, Milan Kivala
Summary: A family of fully bridged triphenylamines with embedded 5- and 7-membered rings is presented. The compounds can undergo strong donor/acceptor interactions with strong cyano-based acceptors in both the solid state and solution.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Luca Craciunescu, Sara Wirsing, Sebastian Hammer, Katharina Broch, Andreas Dreuw, Felipe Fantuzzi, Vipilan Sivanesan, Petra Tegeder, Bernd Engels
Summary: Theoretical studies using clusters as model systems have been successful in explaining photophysical phenomena in organic semiconductor thin films, but have not been able to accurately simulate absorption spectra. This work demonstrates the accurate prediction of spectra using time-dependent density functional theory and optimal tuned functionals when the employed cluster reflects the symmetry of the crystal structure. For pentacene thin films, the computed electronic spectra show an impressive accuracy compared to experimental data, allowing for accurate peak assignments and mechanistic studies.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Joeel Monti, Alberto Concellon, Ruiqi Dong, Mira Simmler, Alexander Muenchinger, Christian Huck, Petra Tegeder, Hermann Nirschl, Martin Wegener, Chinedum O. Osuji, Eva Blasco
Summary: This research develops a new approach for the fabrication of ordered nanoporous microstructures based on supramolecular liquid crystals using two-photon laser printing. The presence of photopolymerizable groups enables the printability of the materials. The study demonstrates the conservation of the materials' arrangement and adsorptive properties after laser microprinting, showing the potential of this approach for functional nanoporous structure fabrication.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Mohsen Ajdari, Ronja Pappenberger, Christian Walla, Marvin Hoffmann, Ina Michalsky, Milan Kivala, Andreas Dreuw, Petra Tegeder
Summary: In this study, the structural and electronic properties of N-HTA 550 and N-HTA 557 adsorbed on Au(111) were investigated using experimental and computational methods. The results showed that both N-HTAs adopt a planar adsorption geometry, and N-HTA 557 has a smaller optical gap due to its larger pi-conjugated electron system.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Tanja Schmitt, Li-Yun Hsu, Nils Oberhof, Debkumar Rana, Andreas Dreuw, Eva Blasco, Petra Tegeder
Summary: Molecular photoswitches are widely used in various disciplines, and the use of multiple photoswitches simultaneously has great potential for improved systems. This study investigates the ultrafast excited state dynamics of two orthogonal photoswitches and their interactions. The results show reversible and independent photoswitchability, and the compounds can be used in 4D printing. The study also examines the influence of different environments on the excited state dynamics.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sara Wirsing, Marc Haensel, Luca Craciunescu, Valentina Belova, Frank Schreiber, Katharina Broch, Bernd Engels, Petra Tegeder
Summary: By combining femtosecond time-resolved second harmonic generation (SHG) with large scale quantum chemical calculations, we studied the ultrafast excited state dynamics at interfaces between diindenoperylene (DIP) and dicyano-perylene-bis(dicarboximide) (PDIR-CN2). Our results showed that an optically induced charge transfer (CT) is observed in the configuration with edge-on geometry and additional face-on domains, resulting in an increase in SHG signal intensity. The interfacial CT state decays within 7.5±0.7 ps, while the creation of hot CT states leads to a faster decay (5.3±0.2 ps). The formation of interfacial CT is suppressed in bilayer structures with mainly edge-on geometries due to the lack of π-π overlap perpendicular to the interface. Our study provides important insights into the D/A charge transfer properties and the interfacial photophysics of these molecules.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Victor G. Ruiz, Christian Wagner, Friedrich Maass, Hadi H. Arefi, Stephan Stremlau, Petra Tegeder, F. Stefan Tautz, Alexandre Tkatchenko
Summary: The authors accurately characterized the adsorption energy of perylene-tetracarboxylic dianhydride molecules on Au(111) using temperature-programmed desorption, single-molecule atomic force microscopy, and non-local density-functional theory. Studying inorganic/organic hybrid systems is crucial for designing complex interfaces.
COMMUNICATIONS CHEMISTRY
(2023)
Article
Chemistry, Physical
Andreas Dreuw, Petra Tegeder
Summary: N-Heteropolycycles (NHPCs) are a promising class of functional organic materials, with tuneable electronic structure and molecular properties through the introduction of nitrogen atoms in the aromatic backbone. Two-photon photoelectron spectroscopy (2PPE) and high-resolution electron energy loss spectroscopy (HREELS) combined with quantum chemical calculations are used in this study to investigate the electronic structure of NHCPs. The results provide insights into the electron-detached and attached states of NHCPs, as well as the energetic position of the lowest triplet states. Based on the findings, an extension of Platt's nomenclature for the low-lying excited pi pi* states in NHPCs can be suggested, and the influence of N-introduction on the occurrence of alpha-band in NHPCs compared to parent polycyclic aromatic hydrocarbons is explained.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Niklas J. Herrmann, Nadine von Coelln, Robin M. Teichgreber, Sebastian Hoefener, Christian Huck, Farhad Ghalami, Simon Settele, Manuel Hertzog, Marcus Elstner, Petra Tegeder, Eva M. Herzig, Jana Zaumseil
Summary: In this study, meniscus-guided zone-casting was used to selectively deposit two different polymorphs of PDIF-CN2 from solution. The two polymorphs can be distinguished by their characteristic low-wavenumber Raman modes and distinctive photoluminescence spectra, reflecting different intermolecular coupling. Despite having different crystalline structures, field-effect transistors based on thin films of both polymorphs show similar electron mobilities.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
N. Maximilian Bojanowski, Christian Huck, Lisa Veith, Karl-Philipp Strunk, Rainer Baeuerle, Christian Melzer, Jan Freudenberg, Irene Wacker, Rasmus R. Schroeder, Petra Tegeder, Uwe H. F. Bunz
Summary: We report the electron-beam induced crosslinking of cinnamate-substituted polythiophene proceeding via excited state [2+2]-cycloaddition. Network formation in thin films is evidenced by infrared spectroscopy and film retention experiments. The electron-stimulated process appears to be superior to photo (UV)-induced crosslinking as it leads to less degradation. Additionally, we successfully used electron beam lithography to pattern cinnamate-substituted polythiophene thin films on the nanoscale with a resolution of around 100 nm. As a proof of concept, we fabricated nanoscale organic transistors using doped and cross-linked P3ZT as contact fingers in thin film transistors.
