Letter
Chemistry, Multidisciplinary
Yahia Chelli, Serena Sandhu, Abdalghani H. S. Daaoub, Sara Sangtarash, Hatef Sadeghi
Summary: It has been found that quantum interference in single molecules can be controlled by changing the spin state of stable open-shell organic radicals, resulting in a significant change in their electrical conductance. This discovery opens up new possibilities for spin interference-based molecular switches for energy storage and conversion applications.
Article
Chemistry, Multidisciplinary
Bintian Zhang, Eathen Ryan, Xu Wang, Weisi Song, Stuart Lindsay
Summary: DNA molecular wires have been extensively studied, while the same is not true for proteins. In this study, a series of consensus tetratricopeptide repeat (CTPR) proteins were synthesized and studied, and it was found that their conductance exceeded that of the canonical molecular wire oligo(phenylene-ethylenene). The decay of conductance with length in the protein followed an exponential pattern, characteristic of quantum tunneling, and a square-law dependence on length, characteristic of weakly driven hopping. Measurements of the energy dependence of the decay length ruled out the quantum tunneling case, and a resonance in the carrier injection energy showed alignment with the Fermi energy of the electrodes.
Article
Biochemistry & Molecular Biology
Mashari Alangari, Busra Demir, Caglanaz Akin Gultakti, Ersin Emre Oren, Joshua Hihath
Summary: DNA has unique electronic properties that are sensitive to its sequence and structure, making it an attractive material for electronic DNA biosensors. This study investigates the origin of multiple conductance peaks in single-molecule break-junction measurements on DNA and demonstrates that these peaks come from different DNA conformations, such as double-stranded B-form DNA and G-quadruplex structures. By using various techniques and controls, the study shows that specific conductance values correspond to specific DNA conformations and that the occurrence of these conductance peaks can be controlled by the local environment.
Article
Chemistry, Multidisciplinary
Xiaohai Ding, Junhong Xue, Shuaishuai Ding, Cong Chen, Xiaojing Wang, Xi Yu, Wenping Hu
Summary: In this study, we report the transport of bi-polarons and the magnetic field induced Pauli spin-blockade in solid-state molecular junctions (MJs) through the observation of positive magnetoresistance (MR). The introduction of redox-active Ru(tpy)(2) molecules leads to the formation of bi-polarons and the magnetic field induced Pauli spin-blockade, resulting in the observed positive MR. Additionally, the reliable and controllable performance of the devices allows for a rigid thickness-dependent MR evolution.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Multidisciplinary
Tianming Li, Vineeth Kumar Bandari, Oliver G. Schmidt
Summary: Molecular electronics aims to extend Moore's law by incorporating individual or ensemble molecules into electronic circuits for next-generation electronics. Over the past 50 years, various techniques have been developed to explore the intrinsic properties of molecules and create diverse molecular electronic devices. The flourishing of molecular electronics is closely related to the development of elegant methodologies for creating nanogap electrodes and bridging them with molecules. This review focuses on the techniques for making nanogap electrodes and constructing molecular circuits, highlighting their capabilities, applications, and future perspectives.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Tamara de Ara, Carlos Sabater, Carla Borja-Espinosa, Patricia Ferrer-Alcaraz, Bianca C. Baciu, Albert Guijarro, Carlos Untiedt
Summary: By using Scanning Tunneling Microscope (STM) and the Break Junction approach, this study reveals that organic solvents are not fully evaporated on gold substrates and characterizes their electronic transport properties in molecular electronics.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Munirah Alsaqer, Abdalghani Daaoub, Sara Sangtarash, Hatef Sadeghi
Summary: Organic materials have potential for thermoelectric applications, and their electrical conductance and Seebeck coefficient can be mechanically tuned to enhance their performance.
Article
Chemistry, Physical
Dariia Yehorova, Joshua S. Kretchmer
Summary: In this work, we develop a real-time extension of the projected density matrix embedding theory (pDMET) to study non-equilibrium electron dynamics in strongly correlated systems. The method involves partitioning the system into fragments and treating the coupling between each fragment and the rest of the system through a quantum bath. The accuracy and efficiency of the method are demonstrated through benchmark calculations and comparisons with other theories.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Marco Carroli, Alex G. Dixon, Martin Herder, Egon Pavlica, Stefan Hecht, Gvido Bratina, Emanuele Orgiu, Paolo Samori
Summary: Organic transistors are crucial for flexible and wearable logic applications, and the pursuit of multiresponsivity is important for enabling sophisticated operations and functions in organic electronics. The first multiresponsive organic device based on a photochromic-ferroelectric organic field-effect transistor has been reported, capable of operating as nonvolatile memory with 11 bit storage capacity in a single device. This proof of concept paves the way for enhanced functional complexity in optoelectronics through the integration of multiple components in a single device.
ADVANCED MATERIALS
(2021)
Article
Astronomy & Astrophysics
C. Cabezas, E. M. Neeman, B. Tercero, C. Bermudez, J. Cernicharo
Summary: The rotational spectrum of cyclopropanecarboxaldehyde was studied to obtain accurate rotational parameters for both cis and trans isomers, allowing for reliable predictions up to 300 GHz. Vibrational excited states of the molecule were identified with the help of high-level theoretical calculations. The experimental rotational parameters were used to search for cyclopropanecarboxaldehyde in warm molecular clouds using spectral surveys captured by ALMA and IRAM 30 m telescopes.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Jie Xu, Hung-Chin Wu, Jaewan Mun, Rui Ning, Weichen Wang, Ging-Ji Nathan Wang, Shayla Nikzad, Hongping Yan, Xiaodan Gu, Shaochuan Luo, Dongshan Zhou, Jeffrey B. -H. Tok, Zhenan Bao
Summary: A method of modifying the packing structure of polymer semiconductors using a molecular additive DOP is reported in this study, which improves the mechanical stretchability of polymers without affecting their charge-carrier transport properties.
ADVANCED MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Xiaohui Li, Wenhui Ge, Shuhan Guo, Jie Bai, Wenjing Hong
Summary: The convergence of supramolecular chemistry and single-molecule electronics provides a new perspective on supramolecular electronics and enhances our understanding of intermolecular charge transport at the molecular level. This review provides an overview of advanced characterization techniques for investigating intermolecular charge transport and summarizes experimental studies on non-covalent interactions at the single-molecule level. The potential applications and future challenges of supramolecular electronics are also discussed.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Physical
Shiqiang Zhao, Hang Chen, Qiaozan Qian, Hewei Zhang, Yang Yang, Wenjing Hong
Summary: This review discusses the fabrication methods and construction routes of non-covalent interaction-based molecular electronic devices with graphene electrodes, as well as the recent progress in designing new-type molecular devices based on graphene and graphene-like 2D materials. The review also provides a prospect on the challenges and opportunities of non-covalent interaction-based molecular electronics.
Article
Physics, Condensed Matter
A. C. L. Moreira, L. S. Marques
Summary: In this work, the charge transport through a nanostructure composed by a double quantum dot was theoretically studied in two different ways: as a single junction (SJ) and a double junction (DJ). Despite starting with different general formulae for transmission, the results obtained with SJ and DJ treatment were shown to be identical for a minimum two-level model system. Finally, a minimal model for a biphenyl system was analyzed in terms of a SJ point of view using both treatments.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Multidisciplinary Sciences
Jinxin Wang, Yongjie Zhao, Shumu Li, Lingyun Shen, Hao Zhang, Caijun Ding, Chang Wei, Yanfang Wang, Yongfang Li, Wenjing Hong, Mao Li
Summary: Understanding the charge transport in sequence-controlled molecules has been a challenge due to the need for controlled synthesis and orientation. We demonstrate a general strategy of electrically driven simultaneous synthesis and crystallization to study the conductance of composition and sequence-controlled monolayers. By synthesizing monolayers uniformly between electrodes, structural disorder and conductance variations are minimized, enabling reproducible measurements on the micrometer scale. These monolayers exhibit tunable current density, on/off ratios, multistate behavior, and negative differential resistance effects.
Article
Physics, Applied
Katsuhiko Nishiguchi, Hiroshi Yamaguchi, Akira Fujiwara, Herre S. J. van der Zant, Gary A. Steele
Summary: We have demonstrated charge detection with single-electron resolution at high readout frequency using a silicon field-effect transistor integrated with double resonant circuits. The transistor, with a channel width of 10 nm, can detect a single electron at room temperature. The transistor is connected to resonant circuits composed of coupled inductors and capacitors, providing two resonance frequencies. By driving the transistor with a carrier signal at the lower resonance frequency, a small signal applied to the transistor's gate modulates the resonance condition, resulting in a reflected signal appearing near the higher resonance frequency. This operation allows for charge detection with a single-electron resolution of 3 x 10(-3) e/Hz(0.5) and a readout frequency of 200 MHz at room temperature.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Amit S. Pawbake, Ruchita T. Khare, Joshua O. Island, Eduardo Flores, Jose R. Ares, Carlos Sanchez, Isabel J. Ferrer, Mahendra Pawar, Otakar Frank, Mahendra A. More, Herre S. J. van der Zant, Andres Castellanos-Gomez, Dattatray J. Late
Summary: The field emission properties of TiS3 nanosheets and nanoribbons synthesized from bulk titanium were investigated. The nanosheets exhibited enhanced field emission behavior with a low turn-on field and delivered a large emission current density at a relatively low applied electric field. The superior field emission performance of TiS3 nanosheets over nanoribbons makes them a propitious field emitter for vacuum nanoelectronics devices.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ana M. Ortuno, Pablo Reine, Luis alvarez de Cienfuegos, Irene R. Marquez, Wynand Dednam, Enrico B. Lombardi, Juan J. Palacios, Edmund Leary, Giovanna Longhi, Vladimiro Mujica, Alba Millan, M. Teresa Gonzalez, Linda A. Zotti, Delia Miguel, Juan M. Cuerva
Summary: We report on the chemical design of chiral molecular junctions with stress-dependent conductance, whose helicity is maintained during the stretching of a single molecule junction due to the stapling of both ends of the inner helix. The conductance values and plateau-length distributions of the reported compounds show different pathways and conformations of the helical structures. Density Functional Theory calculations demonstrate the large chiro-optical responses and potential use of these molecules as unimolecular spin filters with ab-initio estimation of CISS-originating spin polarization for a realistic molecular system.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Jesper Dahl Jensen, Rasmus K. Jakobsen, Zehan Yao, Bo W. Laursen
Summary: Fluorescent probes based on photoinduced electron transfer (PET) quenching of long lifetime triangulenium fluorophores have various applications. This study investigates the rate of PET quenching and its relation to various factors in a series of ADOTA (A) and DAOTA (D) triangulenium fluorophores appended with quencher moieties. The results show that PET quenching is equally efficient/fast from 1 and 2, even with an increase in distance between the donor and the acceptor.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Simon A. Svatek, Valentina Sacchetti, Laura Rodriguez-Perez, Beatriz M. Illescas, Laura Rincon-Garcia, Gabino Rubio-Bollinger, M. Teresa Gonzalez, Steven Bailey, Colin J. Lambert, Nazario Martin, Nicolas Agrait
Summary: The thermoelectric properties of molecular junctions consisting of [60]fullerene derivatives covalently bound to a graphene electrode were studied using a conducting-probe atomic force microscope (c-AFM). The [60]fullerene derivatives were linked to the graphene electrode through different phenyl ring configurations. The results showed that the magnitude of the Seebeck coefficient was up to nine times larger than that of Au-C60-Pt molecular junctions, and the thermopower sign depended on the binding geometry and Fermi energy.
Article
Physics, Multidisciplinary
Mattias Matthiesen, Jorrit R. Hortensius, Samuel Manas-Valero, Itzik Kapon, Dumitru Dumcenco, Enrico Giannini, Makars Siskin, Boris A. Ivanov, Herre S. J. van der Zant, Eugenio Coronado, Alexey B. Kuzmenko, Dmytro Afanasiev, Andrea D. Caviglia
Summary: The research focuses on investigating optical methods for generating coherent magnons in antiferromagnetic insulators. It is found that orbital transitions are key targets for magnetic control in insulators with zero orbital angular momentum.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Analytical
Ryo Nishiyama, Kei Furuya, Phillip McCann, Laura Kacenauskaite, Bo W. Laursen, Amar H. Flood, Kotaro Hiramatsu, Keisuke Goda
Summary: This article introduces a new type of Raman-active nanoparticles called MERdots, which enhance Raman signals by using ionophore macrocycles. These MERdots, combined with resonant broadband time-domain Raman spectroscopy, showed a 3-fold increase in Raman intensity compared to conventional Rdots, and improved the detection limit on their concentration. With their small size and strong Raman signal, along with the broadband capabilities of time-domain resonant Raman spectroscopy, MERdots are promising candidates for a wide range of biological applications.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Viktor Bliksted Roug Pedersen, Tavis W. Price, Nicolaj Kofod, Lev N. Zakharov, Bo W. Laursen, Ramesh Jasti, Mogens Brondsted Nielsen
Summary: This study investigates the synthesis and late-stage functionalization of donor-acceptor cycloparaphenylenes (CPPs) by incorporating fluorenone, and reveals the impact of fluorenone on the molecular structure and properties of the CPPs. The donor-acceptor characters of the CPPs are supported by various studies, including absorption and fluorescence spectroscopic studies, electrochemical studies, and computations.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jeppe Granhoj, Michal Zalibera, Michal Malcek, Viktor Bliksted Roug Pedersen, Andreas Erbs Hillers-Bendtsen, Kurt V. Mikkelsen, Peter Rapta, Mogens Brondsted Nielsen
Summary: By reversibly oxidizing one-dimensional polycyclic aromatic hydrocarbons (PAHs), researchers investigated whether the resulting structures possess a quinoidal or aromatic diradical character. The experimental results were supported by computational calculations, revealing unique optical properties for each charge state.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Fredrik Edhborg, Axel Olesund, Vikrant Tripathy, Yang Wang, Tumpa Sadhukhan, Andrew H. H. Olsson, Niels Bisballe, Krishnan Raghavachari, Bo W. Albinsson, Bo W. Albinsson, Amar H. H. Flood
Summary: The triplet energy of cyanostar (CS) macrocycles, which are key components of small-molecule ionic isolation lattices (SMILES), was measured using phosphorescence quenching studies. The obtained triplet energy is crucial for the design of SMILES materials for future use in triplet state engineering.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Rasmus K. Jakobsen, Bo W. Laursen
Summary: The fluorescence of phenol-substituted ADOTA triangulenium fluorophores is quenched as the water content in acetonitrile increases. The study reveals that water acts as a dynamic quencher by serving as a proton acceptor in a proton coupled electron transfer reaction with the excited ADOTA. Additionally, the ADOTA dyes can be used to probe water content by measuring the fluorescence lifetime.
Article
Materials Science, Multidisciplinary
Jules Moutet, Marko H. Nowack, David D. Mills, Diego L. Lozier, Bo W. Laursen, Thomas L. Gianetti
Summary: This study presents the use of a bipolar molecule as a redox active material in a fully organic symmetrical flow battery, showing excellent performance and stability, which has the potential to promote the development of NAORFB technology.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Organic
Jeppe Granhoj, Viktor Bliksted Roug Pedersen, Peter Lundgard Kroll, Line Brolos, Mogens Brondsted Nielsen
Summary: A mild and less hazardous method for converting 1,3-dithiole-2-thiones into 2-(methylthio)-1,3-dithioles by methylation and reduction is presented.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
