Article
Chemistry, Multidisciplinary
Meng-Kai Lin, Guan-Hao Chen, Ciao-Lin Ho, Wei-Chen Chueh, Joseph Andrew Hlevyack, Chia-Nung Kuo, Tsu-Yi Fu, Juhn-Jong Lin, Chin Shan Lue, Wen-Hao Chang, Noriaki Takagi, Ryuichi Arafune, Tai-Chang Chiang, Chun-Liang Lin
Summary: Monolayer transition metal dichalcogenides show tunability in electronic properties, with bandgap modulation possible through control of tunneling current. Monolayer PtTe2 exhibits a reversible semiconductor-to-metal transition at moderate tunneling current, attributed to its surface electronic structure coupling with the tunneling tip.
Article
Chemistry, Multidisciplinary
Linghao Yan, Orlando J. Silveira, Benjamin Alldritt, Ondrej Krejci, Adam S. Foster, Peter Liljeroth
Summary: The successful fabrication of a 2D monolayer Cu-dicyanoanthracene MOF on an epitaxial graphene surface with long-range order and the study of its structural and electronic properties using low-temperature scanning tunneling microscopy and spectroscopy, along with density-functional theory calculations, show promise for future applications in electronic devices. The ability to access multiple molecular charge states in the 2D MOF using tip-induced local electric fields suggests potential for fabricating and characterizing 2D MOFs with engineered electronic states.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Qi Cheng, Sourabh Khandelwal, Yuping Zeng
Summary: This paper proposes a physically based model for the tunneling current of vertical tunneling field transistors (TFET). The surface potential model is validated at different device regions, and Kane's tunneling formula is used to calculate the band-to-band tunneling current. The results show that optimizing the channel thickness can achieve the highest drive current.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Multidisciplinary
Ching-Hua Wang, Victoria Chen, Connor J. McClellan, Alvin Tang, Sam Vaziri, Linsen Li, Michelle E. Chen, Eric Pop, H-S Philip Wong
Summary: Research on using two-dimensional materials to build ultra-thin tunneling-based memory selectors shows that tuning the Fermi level of MoS2 can improve device nonlinearity. These results provide a foundation for developing high endurance selectors based on 2D heterojunctions.
Article
Chemistry, Multidisciplinary
Tianchao Niu, Miao Zhou
Summary: Boron, the lightest metalloid element, has similar characteristics to carbon in planar and cage molecules. Recent studies have focused on the various structures of mono- and bi-layer boron and their potential applications in materials science. This review highlights the latest achievements in the epitaxial growth of bilayer borophene on noble metal surfaces, discussing the roles of substrate and growth conditions. Bilayer borophene exhibits superior properties compared to single-layer borophene, but its synthesis remains challenging and requires further research.
Article
Chemistry, Multidisciplinary
Youness Kaddar, Wei Zhang, Hanna Enriquez, Yannick J. Dappe, Azzedine Bendounan, Gerald Dujardin, Omar Mounkachi, Abdallah El Kenz, Abdelilah Benyoussef, Abdelkader Kara, Hamid Oughaddou
Summary: Blue phosphorene, an allotrope of black phosphorene, exhibits Dirac fermions similar to graphene when grown on a Cu(111) surface. This suggests that high-speed electronic devices based on ballistic transport at room temperature could be achieved using blue phosphorene.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qilong Wu, Xiaoshuai Fu, Ke Yang, Hongyu Wu, Li Liu, Li Zhang, Yuan Tian, Long-Jing Yin, Wei-Qing Huang, Wen Zhang, Ping Kwan Johnny Wong, Lijie Zhang, Andrew T. S. Wee, Zhihui Qin
Summary: This study demonstrates a practical approach to producing highly crystalline monolayer MoSe2 using high-temperature-annealed Au foil as a weakly interacting substrate for atmospheric pressure chemical vapor deposition. The low-temperature scanning tunneling microscopy/spectroscopy measurements reveal a honeycomb structure of MoSe2 with a quasi-particle bandgap of 1.96 eV. The weak coupling between the Au(100) surface and MoSe2 is critical for easy transfer of monolayers to another host substrate.
Article
Chemistry, Multidisciplinary
Zhichao Zhao, Tiefeng Wu, Chunyu Zhou, Miao Wang, Yunfang Xi, Qiuxia Feng
Summary: In this paper, a comprehensive physical model for the threshold voltage of strained Si NMOSFETs is proposed by solving a Poisson equation and using the gradual channel approximation theory and quasi-two-dimensional analysis. The model investigates the impact of physical effects such as short-channel, narrow-channel, non-uniform doping, and drain-induced barrier lowering effects on the threshold voltage. The model's accuracy and correctness are validated by comparing with experimental results, and variations in the tunneling current of small-sized devices are also studied.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Viliam Vano, Somesh Chandra Ganguli, Mohammad Amini, Linghao Yan, Maryam Khosravian, Guangze Chen, Shawulienu Kezilebieke, Jose L. Lado, Peter Liljeroth
Summary: Unconventional superconductors, particularly nodal superconductors, have been a focus in modern quantum materials research. This study demonstrates the existence of nodal superconductivity in pristine monolayer 1H-TaS2 using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) experiments. It is also found that non-magnetic disorder can drive the nodal state to a conventional gapped s-wave state, and many-body excitations emerge near the gap edge, indicating a potential unconventional pairing mechanism.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qing Lin, Carlo Gilardi, Sheng-Kai Su, Zichen Zhang, Edward Chen, Prabhakar Bandaru, Andrew Kummel, Iuliana Radu, Subhasish Mitra, Greg Pitner, H. -S. Philip Wong
Summary: Carbon nanotube (CNT) transistors experience off-state leakage due to their small effective mass and band gap. A model has been developed to analyze the dependence of the off-current on CNT band gap, supply voltage, and extension doping level. The study provides guidance for optimizing the design of CNT MOSFETs to achieve desired off-current density and on-current.
Article
Chemistry, Multidisciplinary
Ricardo Javier Pena Roman, Remi Bretel, Delphine Pommier, Luis Enrique Parra Lopez, Etienne Lorchat, Elizabeth Boer-Duchemin, Gerald Dujardin, Andrei G. Borisov, Luiz Fernando Zagonel, Guillaume Schull, Stephane Berciaud, Eric Le Moal
Summary: This study demonstrates the local and electrical control of photoluminescence in monolayer WS2 using a nonplasmonic tip and tunneling current of a scanning tunneling microscope. The results show that short-range photoluminescence quenching is present due to near-field electromagnetic effects, independent of the bias voltage. Additionally, a bias-voltage-dependent long-range photoluminescence quenching is observed when the sample is positively biased.
Article
Chemistry, Physical
Ramin Ahmadi, Mohammad Taghi Ahmadi, Seyed Saeid Rahimian Koloor, Michal Petru
Summary: The research focuses on the application of twisted graphene as a new graphene structure in device technology. The study analyzes the geometry effect of twisted graphene on the operation of Schottky transistors, and explores the relationship between twist diameter and twist number.
Article
Chemistry, Multidisciplinary
Somesh Chandra Ganguli, Markus Aapro, Shawulienu Kezilebieke, Mohammad Amini, Jose L. Lado, Peter Liljeroth
Summary: Two-dimensional magnetic materials provide a platform to study and design magnonic excitations. This study demonstrates the emergence of moire magnon excitations in monolayer CrBr3, resulting from the interplay of spin-excitations and the moire pattern. The existence of moire magnons is confirmed through inelastic quasiparticle interference, which shows a dispersion pattern correlated with the moire length scale.
Article
Chemistry, Multidisciplinary
Bo Zhu, Yanwei Wu, Zeyi Zhou, Wenjie Zheng, Yuchen Hu, Yongfei Ji, Lingyao Kong, Rui Zhang
Summary: In this work, large electronic tuning on a WSe2 monolayer is achieved by using different facets of a Au-foil substrate, forming in-plane p-n junctions with remarkable built-in electric fields. This facet-dependent tuning effect is directly visualized by scanning tunneling microscopy and differential conductance spectroscopy. The atomic arrangement of the Au facet effectively changes the interfacial coupling and charge transfer, resulting in different magnitudes of charge doping in WSe2.
Article
Chemistry, Multidisciplinary
Iolanda Di Bernardo, Joan Ripoll-Sau, Jose Angel Silva-Guillen, Fabian Calleja, Cosme G. Ayani, Rodolfo Miranda, Enric Canadell, Manuela Garnica, Amadeo L. Vazquez L. de Parga
Summary: This study uses scanning tunneling microscopy (STM) to investigate MBE-grown monolayer (ML) TaTe2, and reports the first observation of the coexistence of 1H polymorphic phase and 1T phase, with their relative coverage controlled by adjusting synthesis parameters. Several superperiodic structures compatible with CDWs are observed on the 1T phase. The study provides theoretical insight into the stability of different phases, determined by the balance of Te-Ta and Te-Te interactions.
Article
Chemistry, Physical
Alexei A. Stuchebrukhov, Ambili Ramanthrikkovil Variyam, Nadav Amdursky
Summary: Proton dissociation kinetics and related geminate recombination can serve as probes for proton migration mechanisms. A simple model was developed and applied to analyze results obtained using a photo-induced proton release probe. The existence of a kinetic phase transition between exponential and power-law kinetic phases was observed in systems with dimensionality greater than 2.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Physical
Anna Yucknovsky, Benjamin B. Rich, Sara Gutkin, Ambili Ramanthrikkovil Variyam, Doron Shabat, Boaz Pokroy, Nadav Amdursky
Summary: The dynamic control of pH-responsive systems using super photoacids for proton transfer enables self-propulsion of droplets, demonstrating the application of super photoacids in controlling dynamic processes and opening up new possibilities in the field of light-triggered dynamic systems.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Multidisciplinary
Sudipta Bera, Sharada Govinda, Jerry A. Fereiro, Israel Pecht, Mordechai Sheves, David Cahen
Summary: In this study, the electron transport efficiency of solid-state protein-mediated junctions was investigated using streptavidin (STV). The results showed that there was no statistically significant difference in conductivity between free STV and STV bound to biotin, despite some structural changes caused by biotin binding.
Article
Chemistry, Multidisciplinary
Srestha Basu, Nadav Amdursky
Summary: In this study, the combination of achiral nanoparticles and solvent-induced chirality transfer is used to create large structures with chiroptical properties in the form of circularly polarized luminescence (CPL). Carbon dots (C-Dots) with tunable surface moieties are used, and the addition of the chiral solvent limonene to different C-Dots leads to the emergence of CPL signal and the formation of fibrillar assembled structures. The interactions between C-Dots and the limonene phase, as well as the role of the amine groups in both chirality transfer and assembly processes, are discussed.
Article
Chemistry, Multidisciplinary
Anna Yucknovsky, Yaniv Shlosberg, Noam Adir, Nadav Amdursky
Summary: Light is commonly used as an energy source in sustainable technologies for generating photocurrent. We introduced a new mechanism for photocurrent generation based on excited state proton transfer of photoacids and photobases. We demonstrated that the formed ions can serve as electron donors or acceptors, or modify mass transport kinetics, resulting in photocurrent generation. By switching the irradiation between the photoacid and the photobase, control of current polarity can be achieved. Our study represents a new approach in photoelectrochemistry and can be utilized in light-responsive energy production or storage.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Ziyu Yang, Amit Kumar Sarkar, Nadav Amdursky
Summary: Biopolymers, primarily proteins and polysaccharides, are attractive environmentally friendly alternatives to synthetic polymers. In this study, a new platform for combining the advantages of proteins and polysaccharides is introduced, using a glycosylated protein, mucin, as a starting point. Different chemical strategies are used to crosslink the glycoproteins and introduce proton conductivity properties, resulting in a free-standing proton-conductive soft biopolymer with potential applications in soft bioelectronic devices.
Article
Chemistry, Multidisciplinary
Yuval Toren, Ayelet Vilan, Nadav Amdursky
Summary: Carbon dots (CDs) have attracted widespread attention due to their easy preparation, water solubility, biocompatibility, and bright luminescence. This study explores the electron transport across CDs using a molecular junction configuration and demonstrates that the presence of Boron and Phosphorous significantly improves the efficiency of electron transport. Structural characterizations reveal changes in the chemical species across the CDs, and temperature-dependent measurements suggest a tunneling mechanism for electron transport. The conductivity of CDs is comparable to sophisticated molecular wires, indicating their potential as new candidates for molecular electronics applications.
Article
Nanoscience & Nanotechnology
Ramesh Nandi, Anna Orieshyna, Nadav Amdursky
Summary: This study presents a protein-based elastomer that can bind various chromophores and prevent their aggregation. Energy transfer among five different chromophores within the protein matrix is explored, and control over blue, green, and red chromophores results in tunable emission properties and white-light generation. The affordability and simplicity of the chosen protein and molecular doping strategy make these protein elastomers attractive for investigating energy transfer in proteins and potential integration in light-emitting applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Srestha Basu, Martina Peric Bakulic, Zeljka Sanader Marsic, Vlasta Bonacic-Koutecky, Nadav Amdursky
Summary: This study demonstrates the assembly of atomically precise gold nanoclusters into large fibrillar structures that exhibit excitation-dependent luminescence and excitation-selective circularly polarized luminescence (CPL). The origin of CPL in the assembly of atomic clusters is attributed to hierarchical organization and hydrogen bonding interaction with a surfactant. The findings have implications for the rational design of materials with chiroptical properties and controlled CPL activity.
Article
Biochemistry & Molecular Biology
Anna Orieshyna, Jennifer L. Puetzer, Nadav Amdursky
Summary: Collagen, a widely studied protein, not only plays a fundamental role in our bodies but also finds extensive applications in tissue engineering scaffolds. This study reveals a new role for hydroxyproline (Hyp), an abundant component of collagen, in supporting proton transport (PT) through collagen fibrils. The researchers found that adding a methanesulfonyl group significantly enhances PT, while reverting Hyp to proline (Pro) reduces PT efficiency. Understanding the role of Hyp in PT can contribute to a better understanding of the physiological functions of collagen, and modulating conductivity in collagen is crucial in regenerative medicine.
Article
Chemistry, Multidisciplinary
Alessandro Paradisi, Marcello Berto, Matteo Di Giosia, Sara Mazzali, Marco Borsari, Tainah Dorina Marforio, Francesco Zerbetto, Matteo Calvaresi, Anna Orieshyna, Nadav Amdursky, Carlo Augusto Bortolotti, Fabio Biscarini
Summary: This study introduces a simple solution-based method for fabricating electrolyte-gated transistor (EGT) devices using stable dispersions of single-walled carbon nanotubes (SWCNTs)/bovine serum albumin (BSA) hybrids in water. The method allows the formation of a semiconducting random network of SWCNTs as the channel, enabling the fabrication of EGT devices with excellent electrical performance for biosensing applications. The method is demonstrated for the detection of cortisol in solution, showcasing its robustness and cost-effectiveness in overcoming limitations of standard SWCNTs biosensor fabrications.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Yuval Agam, Nadav Amdursky
Summary: In this study, a synthetic and artificial solid-state protein-based matrix doped with natural light-harvesting chlorophyll molecules is developed. The photocurrent generation of this protein matrix shows tunable behavior and can be switched by changing the applied bias, the location of irradiated area, and the gradient doping. Furthermore, the synthetic nature of the protein matrix allows the exploration of different light-harvesting cofactors not found in natural systems.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Sudipta Bera, Jerry A. Fereiro, Shailendra K. Saxena, Domenikos Chryssikos, Koushik Majhi, Tatyana Bendikov, Lior Sepunaru, David Ehre, Marc Tornow, Israel Pecht, Ayelet Vilan, Mordechai Sheves, David Cahen
Summary: This study investigates the efficient electron transport through solid-state junctions in biomolecular electronics. By examining bacteriorhodopsin structures of different thicknesses, the researchers found that the junction currents decay exponentially with increasing width and are almost temperature-independent. The results suggest that electron transport may be limited by the injection into one of the contacts, followed by efficient charge propagation across the protein.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Ambili Ramanthrikkovil Variyam, Yuval Agam, Alessandro Paradisi, Carlo Augusto Bortolotti, Nadav Amdursky
Summary: This article investigates the use of mixed ionic-electronic conductive biopolymers for electronic and bioelectronic applications. The authors demonstrate that by modifying specific amino acids of a protein-based biopolymer with naphthalenediimide (NDI), the electronic transport of the material can be improved without compromising its native ionic transport. The study also shows that by reducing the NDI moieties, a high conductivity value can be achieved. The easy post-polymerization functionalization chemistry of NDI makes this new strategy highly attractive for the development of sustainable mixed conductors using biopolymers.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Mohammad Foqara, Ramesh Nandi, Nadav Amdursky
Summary: Plastic products are essential in our society, but their high carbon footprint and limited degradability raise ecological concerns. A possible solution is using bioplastics derived from biological materials. In this study, we introduce the production of the first ion-conductive bioplastic using easily available casein protein. The sulfonated casein-based bioplastic exhibits desirable mechanical and electrical properties and is degradable. It is also cost-effective due to the abundance of raw materials and absence of purification stages.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
