Article
Nanoscience & Nanotechnology
Shintaro Fujii, Enrique Montes, Haruna Cho, Yi Yue, Masaaki Koike, Tomoaki Nishino, Hector Vazquez, Manabu Kiguchi
Summary: In this paper, the tuning of the thermopower of single-molecule junctions of fullerene, 4,4'-bipyridine, and p-phenylenediamine using scanning tunneling microscopy-based break junction technique is demonstrated. The thermoelectric voltage of the junction is tuned by mechanically controlling the tip-electrode separation distance. The atomistic simulations illustrate the shifts in the conduction orbital energies induced by the mechanical compression of the junctions.
ADVANCED ELECTRONIC MATERIALS
(2022)
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
Nanoscience & Nanotechnology
Yi-Fan Zhou, Wen-Yan Chang, Jing-Zhe Chen, Jun-Ren Huang, Jia-Ying Fu, Jin-Na Zhang, Lin-Qi Pei, Ya-Hao Wang, Shan Jin, Xiao-Shun Zhou
Summary: This study investigates the substituent effects on quantum interference (QI) by designing and synthesizing different substituents at different positions. The results show that methoxy and nitryl groups can modulate the transmission properties caused by antiresonance and destructive quantum interference. Moreover, the nitryl substituent can achieve a high on/off ratio of single-molecule conductance under specific conditions.
Article
Nanoscience & Nanotechnology
Xiao-Mei Li, Ya-Hao Wang, Jing-Wen Seng, Ju-Fang Zheng, Rui Cao, Yong Shao, Jing-Zhe Chen, Jian-Feng Li, Xiao-Shun Zhou, Bing-Wei Mao
Summary: Fabricating single-molecule diodes using asymmetric metal electrodes is a significant challenge, but the development of a z-piezo pulse-modulated STM-BJ technique in this study has enabled the construction of robust asymmetric junctions. The resulting asymmetric junctions exhibit rectifying behavior at the single-molecule level, with a decrease in single-molecule conductance when reversing bias voltage. This research provides a feasible approach for fabricating hybrid junctions based on asymmetric metal electrodes and investigating electron transport behavior.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
David Jago, Chongguang Liu, Abdalghani H. S. Daaoub, Emma Gaschk, Mark C. Walkey, Thea Pulbrook, Xiaohang Qiao, Alexandre N. Sobolev, Stephen A. Moggach, David Costa-Milan, Simon J. Higgins, Matthew J. Piggott, Hatef Sadeghi, Richard J. Nichols, Sara Sangtarash, Andrea Vezzoli, George A. Koutsantonis
Summary: The design of molecular switches is crucial for the development of molecular electronics. This study describes the use of spiropyrans in single-molecule devices and introduces an orthogonal T-shaped approach for incorporating spiropyran moieties, which leads to higher conducting states. Photochemical isomerization to merocyanine increases the conductance of the molecules.
Article
Chemistry, Multidisciplinary
Umar Rashid, Elarbi Chatir, Leonardo Medrano Sandonas, P. A. Sreelakshmi, Arezoo Dianat, Rafael Gutierrez, Gianaurelio Cuniberti, Saioa Cobo, Veerabhadrarao Kaliginedi
Summary: By using a mechanically controllable break junction technique, we created an ideal single molecular linear actuator based on dithienylethene (DTE) molecular architecture. This actuator undergoes reversible photothermal isomerization when exposed to UV irradiation under normal conditions, achieving both open and closed forms. Interestingly, the actuation occurs without altering the molecular junction's conductivity around the Fermi level, making it an essential property for an ideal single molecular actuator. Our study demonstrates a unique example of achieving a perfect balance between tunneling width and barrier height change during photothermal isomerization, resulting in no conductivity change but a change in molecular length for mechanical actuation at the single molecular level.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
C. S. Quintans, Denis Andrienko, Katrin F. Domke, Daniel Aravena, Sangho Koo, Ismael Diez-Perez, Albert C. Aragones
Summary: External electric fields have been shown to catalyse chemical reactions efficiently, even those inaccessible via wet-chemical synthesis. Single-molecule junctions of carotenoids have been electrically characterized to show distinct conductance signatures for the trans and cis isomers. The electric field is found to polarize the molecule, mix excited states, and promote both isomerization and electron transport within the molecule.
APPLIED SCIENCES-BASEL
(2021)
Review
Materials Science, Multidisciplinary
Florian Laible, Anke Horneber, Monika Fleischer
Summary: By mechanically changing the width of a nanometer gap between two optical antennas, the coupling condition can be modified, leading to a shift in the antenna's localized surface plasmon resonance wavelength and a modification of the intensity in the antenna hotspot. Applications of such systems include plasmonic strain sensing and tunable surface-enhanced Raman spectroscopy platforms.
ADVANCED OPTICAL MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Andrea Vezzoli
Summary: Single-molecule junctions, devices that connect a single molecule to two electrodes, can respond to various stimuli and exhibit mechanoresistive behavior, where their electrical resistance changes upon the application of a mechanical stress. This phenomenon can occur at the metal-molecule interface or within the molecular backbone. Over the years, strategies to achieve reproducibility, sensitivity, and reversible behavior have been developed. These devices provide valuable insights into charge transfer/transport at the metal/molecule interface and have potential applications in nanoelectromechanical systems.
Article
Chemistry, Multidisciplinary
Yong Hu, Jin Li, Yu Zhou, Jie Shi, Guopeng Li, Hang Song, Yang Yang, Jia Shi, Wenjing Hong
Summary: In this study, responsive molecular devices with acid-base and photo-thermal responses were fabricated using a single dynamic acyl hydrazone bond. The devices exhibited three well-defined molecular conductance states, with reversible switching and distinct ON/OFF ratios. Density functional theory calculations revealed that the multiple conductance states were due to the dynamic acyl hydrazone bond exchange and C=N isomerization. This work opens up new possibilities for designing tailored single-molecule electrical devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
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
Jing Zeng
Summary: In this study, the spin-dependent transport properties of dithiane sandwiched between conventional ferromagnetic electrodes were investigated. It was found that an obvious spin-filtering effect was observed when dithiane was coupled to Ni or Co electrodes. Additionally, the magnetoresistance effect strongly depended on the type of ferromagnetic electrodes, with a relatively high MR ratio only observed in dithiane bonded to Co electrodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yi Chang, Guang-Ping Zhang, En-Fei Xing, Chuan-Kui Wang, Gang Chen, Yang Song
Summary: In this study, the current evolution of (4, 4) single-walled carbon nanotube (CNT) based nanowires during squashing processes was systematically investigated. It was found that the electrical conductance of the nanowire is negatively correlated with the applied pressure, and the pressure direction affects the response of the nano junction current. The squashing process results in symmetry breaking and pi stacking behavior, and the CNTs can completely cut off the nano junction current, achieving a significant on/off ratio at low bias voltages. The underlying mechanisms were revealed through analysis of band structures, transmission spectra, frontier molecular orbitals, and transmission pathways.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Joseph M. Hamill, Christopher Weaver, Tim Albrecht
Summary: The method utilizes scanning tunneling microscope single molecular break junction to measure and correlate single-molecule thermopower and electrical conductance simultaneously, without the need for custom-built electronics, greatly facilitating measurements. It statistically correlates Seebeck voltage offset, electrical conductance, and stretching displacement of the single-molecule junction, allowing for direct comparison with results obtained at constant bias through current-distance spectroscopy.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Filip Kilibarda, Alexander Strobel, Torsten Sendler, Matthias Wieser, Michael Mortensen, Julie Brender Trads, Manfred Helm, Jochen Kerbusch, Elke Scheer, Sibylle Gemming, Kurt Gothelf, Artur Erbe
Summary: This study presents a comprehensive investigation of charge transport in a class of molecules that allows modifications by introducing metal centers into organic structures. It is found that the presence of single metal ions can modify the energy levels and the coupling of the molecules to the electrical contacts, leading to systematic variations in the statistical behavior of transport properties of the molecular junctions. The understanding of the role of the metal ion in the resulting conductance properties is crucial for the development of molecular electronic circuits.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
Yutaka Ie, Kazunari Tanaka, Aya Tashiro, See Kei Lee, Henrique Rosa Testa, Ryo Yamada, Hirokazu Tada, Yoshio Aso
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2015)
Article
Chemistry, Multidisciplinary
See Kei Lee, Marius Buerkle, Ryo Yamada, Yoshihiro Asai, Hirokazu Tada
Article
Chemistry, Multidisciplinary
See Kei Lee, Ryo Yamada, Shoji Tanaka, Gap Soo Chang, Yoshihiro Asai, Hirokazu Tada
Article
Chemistry, Multidisciplinary
Yutaka Le, Masaru Endou, See Kei Lee, Ryo Yamada, Hirokazu Tada, Yoshio Aso
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2011)
Article
Chemistry, Multidisciplinary
See Kei Lee, Tatsuhiko Ohto, Ryo Yamada, Hirokazu Tada
Article
Chemistry, Multidisciplinary
Yutaka Ie, Masaru Endou, Aihong Han, Ryo Yamada, Hirokazu Tada, Yoshio Aso
PURE AND APPLIED CHEMISTRY
(2012)
Article
Chemistry, Physical
Yutaka Ie, Yuji Okamoto, Takuya Inoue, Saori Tone, Takuji Seo, Yasushi Honda, Shoji Tanaka, See Kei Lee, Tatsuhiko Ohto, Ryo Yamada, Hirokazu Tada, Yoshio Aso
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Chemistry, Physical
Tatsuhiko Ohto, Takuya Inoue, Helen Stewart, Yuichi Numai, Yoshio Aso, Yutaka Ie, Ryo Yamada, Hirokazu Tada
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Biochemistry & Molecular Biology
Ryo Yamada, Issei Nomura, Yuki Yamaguchi, Yosuke Matsuda, Yoshikazu Hattori, Hirokazu Tada, Akira Ono, Yoshiyuki Tanaka
NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS
(2020)
Article
Chemistry, Multidisciplinary
Yutaka Ie, Yuji Okamoto, Takuya Inoue, Takuji Seo, Tatsuhiko Ohto, Ryo Yamada, Hirokazu Tada, Yoshio Aso
Summary: This study presents a rational molecular design to enhance intramolecular hopping charge transport in materials by synthesizing a series of oligothiophenes with lengths up to 10 nm and periodically twisted structures, which exhibit lower resistance than planar oligothiophenes in single-molecule conductance measurements.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Physics, Applied
Grace Gita Redhyka, Yuki Hanamura, Ryo Yamada, Hirokazu Tada
Summary: A marker system based on binary translation of two-dimensional coordinates was developed for the positional determination of individual nanomaterial adsorbed on a substrate. The coordinate markers were successfully used to prepare field-effect transistors with thin bundles of single-walled carbon nanotubes.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Rachmat Andika, Ryo Yamada, Hirokazu Tada
Summary: We demonstrate a magnetic response in Au/1,6-hexanedithiol/Au single-molecule junctions at room temperature using a mechanically controllable break junction method. The electrical resistance of the junction increases by up to 5.5% under a magnetic field, which may be attributed to the presence of unpaired charges at the Au/S interface.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Takashi Tamaki, Keigo Minode, Yuichi Numai, Tatsuhiko Ohto, Ryo Yamada, Hiroshi Masai, Hirokazu Tada, Jun Terao
Article
Chemistry, Multidisciplinary
Murni Handayani, Hirofumi Tanaka, Shinichi Katayose, Tatsuhiko Ohto, Zhijin Chen, Ryo Yamada, Hirokazu Tada, Takuji Ogawa
Article
Chemistry, Multidisciplinary
Ryo Yamada, Ken Albrecht, Tatsuhiko Ohto, Keigo Minode, Kimihisa Yamamoto, Hirokazu Tada
