Article
Chemistry, Multidisciplinary
Kuniyuki Miwa, Souichi Sakamoto, Akihito Ishizaki
Summary: The energetic positions of molecular electronic states at molecule/electrode interfaces play a crucial role in determining the transport and optoelectronic properties of molecular junctions. A study investigates electroluminescence from single-molecule junctions where the molecule is strongly coupled with the vacuum electromagnetic field in a plasmonic nanocavity. It demonstrates an improvement in the electroluminescence efficiency by selectively controlling the formation of the lowest-energy excited state through strong light-matter coupling. The research findings contribute to manipulating optoelectronic conversion in molecular junctions and provide design principles for efficient molecular optoelectronic devices.
Review
Optics
Peihui Li, Yijian Chen, Boyu Wang, Mengmeng Li, Dong Xiang, Chuancheng Jia, Xuefeng Guo
Summary: Single-molecule devices offer an alternative strategy for overcoming the miniaturization and functionalization bottlenecks of traditional semiconductor devices, as well as serving as a reliable platform to explore intrinsic properties of matter at the single-molecule level. This review introduces optoelectronic effects in single-molecule devices, including photoisomerization switching, photoconductance, plasmon-induced excitation, photovoltaic effect, and electroluminescence, with emphasis on photoisomerization, photoexcitation, and photo-assisted tunneling processes. Discussions focus on opportunities and challenges in single-molecule optoelectronics field and propose possible breakthroughs.
OPTO-ELECTRONIC ADVANCES
(2022)
Review
Chemistry, Multidisciplinary
Peihui Li, Chuancheng Jia, Xuefeng Guo
Summary: The article introduces the research progress of molecule-based FETs, systematically studied the construction and performance of FETs through molecular and device design, proposed the broad concept of molecular FETs, and discussed the development challenges of single-molecule FETs and prospects for further breakthroughs in this field.
Article
Chemistry, Physical
Sonja Wieland, Abdurrahman Ali El Yumin, Jan M. Gotthardt, Jana Zaumseil
Summary: Trions are charged excitons formed in low-dimensional semiconductors upon optical or electrical excitation in the presence of charge carriers. Trion emission in semiconducting single-walled carbon nanotubes (SWCNTs) occurs in the near-infrared and at lower energies compared to exciton emission. The influence of different dielectric materials on exciton and trion emission in SWCNT-based top-gate field-effect transistors is investigated, showing a clear dependence on the charge trapping properties of the dielectrics. The ratio of trion to exciton emission and the exciton blue-shift are not suitable as quantitative metrics for doping levels.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Gautam Mitra, Jonathan Z. Low, Sujun Wei, Karol R. Francisco, Michael Definer, Carmen Herrmann, Luis M. Campos, Elke Scheer
Summary: This study reports transport measurements on tunable single-molecule junctions of the organic perchlorotrityl radical molecule, contacted with gold electrodes at low temperature. A subset of junctions shows zero bias anomalies due to the Kondo effect and elevated magnetoresistance. Junctions without Kondo resonance reveal a stronger magnetoresistance. The amplitude of the magnetoresistance can be tuned by mechanically stretching the junction. The high magnetoresistance is attributed to an interference effect involving spin-dependent scattering at the metal-molecule interface, and the Kondo effect is assigned to the unpaired spin located in the center of the molecule in asymmetric junctions.
Article
Chemistry, Multidisciplinary
Chen Yang, Yilin Guo, Shuyao Zhou, Zhirong Liu, Zitong Liu, Deqing Zhang, Xuefeng Guo
Summary: A robust single-molecule light-emitting diode (SM-LED) is developed by integrating a fluorescent molecule into nanogapped graphene electrodes. The SM-LED exhibits high color purity, linear polarization, and tunable efficiency. It also achieves single-molecule Forster resonance energy transfer and can serve as a single-photon emitter for quantum computation and communication.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yaoguang Li, Wei Xu, Yu-Ling Zou, Jing Li, Tengyang Gao, Ruiyun Huang, Lichuan Chen, Zongyuan Xiao, Jia Shi, Yang Yang, Wenjing Hong
Summary: In this study, a redox-mediated single-molecule transistor with a subthreshold swing (SS) of 120 mV decade(-1) was fabricated using the electrochemical-scanning tunneling microscopy break junction (EC-STM-BJ) technique. The transistor exhibited low static power consumption and a high on/off ratio, suggesting a promising design strategy for single-molecule devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Chenmaya Xia, Daqi Zhang, Henan Li, Sheng Li, Haoming Liu, Li Ding, Xiyan Liu, Min Lyu, Ruoming Li, Juan Yang, Yan Li
Summary: SWNTs can be used to construct reusable SERS substrates with single molecule sensitivity and preservation of intrinsic properties, utilizing polyhedral gold nanocrystals to create effective hot spots. Using SWNTs to build SERS substrates may become a powerful strategy in various single molecule studies.
Article
Chemistry, Multidisciplinary
Lei-Lei Nian, Tao Wang, Jing-Tao Lu
Summary: This study theoretically predicts that the emitted light from the plasmon mode in an STM single molecular junction can be squeezed with reduced quantum fluctuations under external laser drive. By selectively exciting energy levels, the squeezed plasmon can exhibit sub-or superPoissonian statistical properties. It is also demonstrated that the molecular excitonic mode can be squeezed simultaneously.
Article
Chemistry, Multidisciplinary
Zhixing Lu, Songjun Hou, Rongjian Lin, Jie Shi, Qingqing Wu, Shiqiang Zhao, Luchun Lin, Chun Tang, Yang Yang, Colin J. Lambert, Wenjing Hong
Summary: In this study, semimetallic transition metal dichalcogenides (TMDCs) 1T-WTe2 were used as electrodes to fabricate WTe2/metalated tetraphenyl-porphyrin (M-TPP)/WTe2 junctions via van der Waals interaction. Compared to chemically bonded Au/M-TPP/Au junctions, the conductance of these M-TPP van der Waals molecular junctions was enhanced by 736%. Moreover, the WTe2/M-TPP/WTe2 junctions exhibited a tunable conductance range of 10^(-3.29) to 10^(-4.44) G through single-atom control, recording the widest tunable range of conductance for M-TPP molecular junctions. This work demonstrates the potential of two-dimensional TMDCs in constructing highly tunable and conductive molecular devices.
Article
Chemistry, Multidisciplinary
Joel G. Fallaque, Sandra Rodriguez-Gonzalez, Cristina Diaz, Fernando Martin
Summary: This study presents a systematic theoretical investigation of the conductance of different disubstituted acenes, revealing that the relative variation of conductance can be well explained by the variations of HOMO energies as predicted by a simple extended-Huckel approach. The model accurately predicts the conductance trends among different types of acenes and linkers, providing insights into engineering molecular conductance. This approach is expected to be useful in predicting trends in the conductance of a wide range of disubstituted acene isomers.
Article
Chemistry, Multidisciplinary
Jirat Chatsirisupachai, Phattananawee Nalaoh, Chokchai Kaiyasuan, Pongsakorn Chasing, Taweesak Sudyoadsuk, Vinich Promarak
Summary: The study of purely organic molecules with dual emissive properties has gained significant attention for their applications in optoelectronics, sensing, and biomedical fields. Two new tetraphenylethylene- and triphenylethylene-substituted phenanthrocarbazoles exhibited distinct fluorescence emissions in solution and solid state, with the potential for white-light emission.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Yaorong Chen, Longfeng Huang, Hang Chen, Zhixin Chen, Hewei Zhang, Zongyuan Xiao, Wenjing Hong
Summary: Single-molecule devices, fabricated by bridging a single molecule through electrodes, offer a promising approach for studying the intrinsic chemical or physical properties of individual molecules. In addition to single-molecule wires, a variety of responsive single-molecule junctions or devices with unique properties have been designed by introducing external fields, providing opportunities for exploring conductive materials at the molecular level. This review summarizes recent studies on the behavior of single-molecule devices based on photon, thermal, electric, or magnetic responses and discusses the future development of responsive single-molecule devices.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
Ya-Hao Wang, Feng Yan, Dong-Fang Li, Yan-Feng Xi, Rui Cao, Ju-Fang Zheng, Yong Shao, Shan Jin, Jing-Zhe Chen, Xiao-Shun Zhou
Summary: This study presents a new strategy to improve the electrochemical gating efficiency of single-molecule conductance, achieving a significant gating ratio through fused molecular structures. The research demonstrates that electrochemical gating performance can be significantly modulated by adjusting the alignment of the conducting orbital of the heterocyclic molecule relative to the metal Fermi energy.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Koji Yasuraoka, Satoshi Kaneko, Shuji Kobayashi, Kazuhito Tsukagoshi, Tomoaki Nishino
Summary: This study utilized surface-enhanced Raman scattering (SERS) signals to detect local structural changes in the metal-molecule interaction within a C60 single-molecule junction (SMJ). The analysis revealed vibration energy shifts originating from different Au-C60 interactions, indicating that the probability of SERS was enhanced depending on these local structural changes.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Wenshan Li, Frank Hennrich, Benjamin S. Flavel, Simone Dehm, Manfred Kappes, Ralph Krupke
Summary: Dielectrophoresis (DEP) describes the motion of suspended objects in an inhomogeneous electric field. Researchers have extensively studied DEP in aqueous and organic solutions, with recent applications focused on polymer-wrapped single-walled carbon nanotubes (SWCNTs) in organic solvents due to the availability of ultra-pure SWCNT content.
Article
Chemistry, Multidisciplinary
Liang Xu, Michal Valasek, Frank Hennrich, Elaheh Sedghamiz, Montserrat Penaloza-Amion, Daniel Haussinger, Wolfgang Wenzel, Manfred M. Kappes, Marcel Mayor
Summary: The study proposes a novel method for separating semiconductor SWCNTs from polymers using acid treatment, which allows for the re-synthesis of chiral polymers with defined chirality. This approach enables efficient separation of nanotube handedness.
Article
Physics, Applied
Alexander Janissek, Jakob Lenz, Fabio del Giudice, Marco Gaulke, Felix Pyatkov, Simone Dehm, Frank Hennrich, Li Wei, Yuan Chen, Artem Fediai, Manfred Kappes, Wolfgang Wenzel, Ralph Krupke, R. Thomas Weitz
Summary: Ionic liquids enable efficient gating of materials with nanoscale morphology, leading to ideal control of drain current on (9, 8) carbon nanotubes. The results have potential relevance for biosensing applications with high-density device arrays.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Linda Maria Bannwart, Thomas Muentener, Michel Rickhaus, Lukas Jundt, Daniel Haeussinger, Marcel Mayor
Summary: The study presents and discusses the synthesis and spatial arrangement of the novel diacetylene bridged terphenylic macrocycle 1, as well as its limited stability in the presence of molecular oxygen. The synthesis is largely based on acetylene scaffolding strategies and the dynamic enantiomerization process is explored.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Organic
Rajesh Mannancherry, Tomas Solomek, Diana Cavalli, Juraj Malincik, Daniel Haussinger, Alessandro Prescimone, Marcel Mayor
Summary: The study involves the synthesis and characterization of two sulfonyl-bridged Gelander helices obtained from oxidation of sulfide bridged precursors. NMR, mass spectrometry, optical spectroscopy, and X-ray diffraction were used for full characterization. The results show a significant increase in enantiomerization barrier for 1a upon transformation from sulfide to sulfone, challenging previous assumptions about the correlation between bridging structures and enantiomerization Gibbs free energy.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Polymer Science
Liang Xu, Michal Valasek, Frank Hennrich, Regina Fischer, Manfred M. Kappes, Marcel Mayor
Summary: This study utilized conjugated polymer sorting to purify as-produced single-walled carbon nanotubes, obtaining high-purity semiconducting SWCNTs. Several degradable copolymers were synthesized for selective extraction of s-SWCNTs, with successful removal of the polymer after acid treatment to obtain dispersant-free s-SWCNTs. This research paves the way for the development of the next generation of CNT devices using dispersant-free semiconducting carbon nanotubes.
Article
Chemistry, Multidisciplinary
Sandeep Kumar, Yohanes Pramudya, Kai Mueller, Abhinav Chandresh, Simone Dehm, Shahriar Heidrich, Artem Fediai, Devang Parmar, Delwin Perera, Manuel Rommel, Lars Heinke, Wolfgang Wenzel, Christof Woll, Ralph Krupke
Summary: Graphene is inherently sensitive to vicinal dielectrics and local charge distributions, and can be used as a sensor; metal-organic frameworks can selectively adsorb specific molecular species; growing a surface-mounted metal-organic framework directly onto graphene field-effect transistors demonstrates a selective ethanol sensor with unprecedented shifts in Dirac point voltage response.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Herve Dekkiche, Juraj Malincik, Alessandro Prescimone, Daniel Haussinger, Marcel Mayor
Summary: A new type of Gelander molecule based on an ortho-tetraphenylene core with unique helical chiral bicyclic structure was synthesized and fully characterized. Various strategies, including McMurry coupling and olefin metathesis, were utilized to assemble the target structure, leading to successful synthesis with satisfying yields. The chiral bicyclic molecule was synthesized as a racemate and then separated into pure enantiomers for studying and assigning chiroptical properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Nico Balzer, Jan Lukasek, Michal Valasek, Vibhuti Rai, Qing Sun, Lukas Gerhard, Wulf Wulfhekel, Marcel Mayor
Summary: The study found that adding pyrrolidinyl group can enhance the fluorescence of NDI chromophores and cause a significant redshift in their absorption spectrum, resulting in a narrower bandgap. By using cyclic voltammetry, it was revealed that the redox properties of NDIs are influenced by core substituents, and the adsorption behavior of NDIs on a gold surface was observed.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
E. Henrik Peters, Marcel Mayor
Summary: This review provides an overview of various approaches to synthesize gold nanoparticles (AuNPs) with a single chemically addressable unit and their diverse fields of application. The complementary physical properties of AuNPs combined with precise chemical control of their attachment make them promising building blocks for numerous proof-of-concept experiments and applications.
Article
Chemistry, Multidisciplinary
Ksenia Reznikova, Chunwei Hsu, Werner M. Schosser, Almudena Gallego, Katawoura Beltako, Fabian Pauly, Herre S. J. van der Zant, Marcel Mayor
Summary: The correlation between substitution pattern, conductance, and mechanosensitivity in [2.2]paracyclophane (PCP)-based molecular wires was investigated in a mechanically controlled break junction experiment. It was found that para-phenyl-coupled anchoring in the PCP core leads to large variations in conductance values with changes in electrode separation, while this mechanosensitivity is absent for the meta-PCP core. The experimental findings were interpreted in terms of quantum interference effects between molecular frontier orbitals.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Review
Chemistry, Multidisciplinary
Patrick Zwick, Diana Dulic, Herre S. J. van der Zant, Marcel Mayor
Summary: The review highlights the direct measurement of single-molecule electrical transparency by break junction experiments, focusing on the use of porphyrins as molecular components and their potential for future device construction. Various examples illustrate the features provided by porphyrins, such as low level misalignments and very low attenuation factors, showcasing the potential and limitations of these molecular junctions.
Article
Materials Science, Multidisciplinary
Eric Sidler, Juraj Malincik, Alessandro Prescimone, Marcel Mayor
Summary: The study presents the design and synthesis of a easily accessible axial chirality-inducing framework for a chromophore, which was fully characterized and resolved using various analytical techniques. This simple yet potent framework shows promise in enriching the structural diversity of chiral materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Organic
Laurent Jucker, Yves Aeschi, Marcel Mayor
Summary: The study reports the incorporation of a linear D-pi-A push-pull chromophore synthesized by a Knoevenagel condensation as axle of a rotaxane, with mechanical fixation of the superstructure achieved by click chemistry in aqueous solution. The isolated rotaxane with a red-to-NIR emitting dye as axle demonstrates enhanced emission in aqueous buffered media compared to the unthreaded model chromophore.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Physical
Timo Frauhammer, Lukas Gerhard, Kevin Edelmann, Marcin Lindner, Michal Valasek, Marcel Mayor, Wulf Wulfhekel
Summary: In this study, rotational switching of a thioacetate group mounted on a tripodal tetraphenylmethane derivative adsorbed in ordered islands on a Au(111) surface was investigated. The functional dependence of this switching on sample bias and tip-sample distance allowed for modeling the energy landscape as an electric dipole in the electric field. Correlations between states of neighboring molecules were observed, consistent with the interaction of two dipoles.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
