Article
Chemistry, Physical
Oliver Braun, Jan Overbeck, Maria El Abbassi, Silvan Kaser, Roman Furrer, Antonis Olziersky, Alexander Flasby, Gabriela Borin Barin, Qiang Sun, Rimah Darawish, Klaus Muellen, Pascal Ruffieux, Roman Fasel, Ivan Shorubalko, Mickael L. Perrin, Michel Calame
Summary: This study reports a method for integrating atomically precise graphene nanoribbons in a field-effect transistor geometry using graphene electrodes defined by electron beam lithography, which allows for controlled electrode geometries. Thermal annealing is found to be a crucial step for successful device operation, ensuring stable electronic transport characteristics.
Article
Chemistry, Multidisciplinary
Jian Zhang, Gabriela Borin Barin, Roman Furrer, Cheng-Zhuo Du, Xiao-Ye Wang, Klaus Muellen, Pascal Ruffieux, Roman Fasel, Michel Calame, Mickael L. Perrin
Summary: Bottom-up synthesized graphene nanoribbons (GNRs) are of interest due to their atomically controlled structure and customizable physical properties. However, understanding the relationship between cryogenic charge transport and the number of GNRs in a device is challenging due to lack of precise control over GNR length and location.
Editorial Material
Nanoscience & Nanotechnology
Sheng-Yi Xie, Xian-Bin Li
Summary: The study found a novel method to produce metallic GNRs by inserting a symmetric superlattice into other semiconductive GNRs, broadening their applications in nanoelectronics and fundamental science.
NANO-MICRO LETTERS
(2021)
Article
Physics, Condensed Matter
Feng-Lin Shyu
Summary: Band structures of armchair graphene nanoribbons (AGNRs) under crossed external fields are calculated using the tight-binding model. The results show that magnetic field and electric field both have significant effects on the band structures, further demonstrating the complex characteristics of these effects on plasmon spectra and reflectance spectra.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Tao Wang, Sofia Sanz, Jesus Castro-Esteban, James Lawrence, Alejandro Berdonces-Layunta, Mohammed S. G. Mohammed, Manuel Vilas-Varela, Martina Corso, Diego Pena, Thomas Frederiksen, Dimas G. de Oteyza
Summary: This study characterized the magnetic states of chiral graphene nanoribbons by substitution of hydrogen atoms with ketones, leading to the generation of unpaired pi radicals that can interact via exchange coupling. The interactions between these radical states were found to depend significantly on factors such as chirality and the presence of ketone functionalization, and the parameters for accurately describing these systems within the mean-field Hubbard model were determined. Overall, this research provides insights for theoretically modeling and designing GNR-based nanostructures with tunable magnetic properties.
Article
Materials Science, Multidisciplinary
P. Schmelcher, B. S. Monozon
Summary: In this study, we present an analytical approach to investigate the multiphoton absorption and Rabi oscillations in armchair graphene nanoribbons (AGNRs) subjected to a time-oscillating electric field induced by a parallel light wave. We employ the two-dimensional Dirac equation for massless electrons confined within the ribbon and derive the explicit expressions for the production rate of electron-hole pairs, the multiphoton absorption coefficient, and the frequency of Rabi oscillations in the resonant approximation. We examine the dependence of these quantities on the ribbon width and electric field strength in both the multiphoton-assisted and tunneling regimes, corresponding to time-oscillating and constant electric fields, respectively. Our results reveal a significant enhancement effect of the oscillating electric field on intersubband transitions. Furthermore, our analytical results are qualitatively consistent with numerical calculations for graphene layers. Estimations of experimental values for commonly used AGNRs and laser parameters suggest that both Rabi oscillations and multiphoton absorption phenomena can be observed in laboratory settings. Moreover, the data related to intersubband tunneling indicates that AGNRs can serve as a one-dimensional condensed matter analog for detecting quantum electrodynamics vacuum decay by applying an external electric field.
Article
Materials Science, Multidisciplinary
Yadong Wei, Weiqi Li, Yongyuan Jiang, Jinluo Cheng
Summary: Theoretical investigation on one-color injection currents and shift currents in zigzag graphene nanoribbons reveals that these two currents can be separately excited by specific light polarization. Numerical calculations based on a tight binding model show peaks associated with optical transitions between different subbands, which can be effectively controlled by the static electric field. The results provide a physical basis for realizing passive optoelectronic devices based on graphene nanoribbons.
Article
Chemistry, Multidisciplinary
Gabriela Borin Barin, Qiang Sun, Marco Di Giovannantonio, Cheng-Zhuo Du, Xiao-Ye Wang, Juan Pablo Llinas, Zafer Mutlu, Yuxuan Lin, Jan Wilhelm, Jan Overbeck, Colin Daniels, Michael Lamparski, Hafeesudeen Sahabudeen, Mickael L. Perrin, Jose Urgel, Shantanu Mishra, Amogh Kinikar, Roland Widmer, Samuel Stolz, Max Bommert, Carlo Pignedoli, Xinliang Feng, Michel Calame, Klaus Muellen, Akimitsu Narita, Vincent Meunier, Jeffrey Bokor, Roman Fasel, Pascal Ruffieux
Summary: In this study, the growth, characterization, and device integration of 5-atom wide armchair GNRs were investigated, showing potential for switching behavior at room temperature. The optimized growth protocols successfully bridge between atomic precision control of electronic properties and successful device integration of GNRs.
Review
Physics, Applied
Haomin Wang, Hui Shan Wang, Chuanxu Ma, Lingxiu Chen, Chengxin Jiang, Chen Chen, Xiaoming Xie, An-Ping Li, Xinran Wang
Summary: Graphene nanoribbons, as a family of one-dimensional materials with a graphitic lattice structure, have shown high mobility, current-carrying capability, and versatile electronic properties, making them promising candidates for quantum electronic applications. Recent progress has been made in the atomically precise bottom-up synthesis of GNRs and heterojunctions, as well as in the production of semiconducting GNR arrays on insulating substrates, indicating a potential for large-scale digital circuits. In the near future, GNRs could become competitive candidate materials in quantum information sciences.
NATURE REVIEWS PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yi-Ying Sung, Harmina Vejayan, Christopher J. Baddeley, Neville V. Richardson, Federico Grillo, Renald Schaub
Summary: On-surface synthesis with designer precursor molecules is an effective method for preparing graphene nanoribbons (GNRs) with tunable electronic properties. The band gap of GNRs doped with heteroatoms remains unchanged, but hydrogenation can engineer a tunable band gap. Surface-confined hydrogenation studies on 7-armchair GNRs grown on Au(111) surfaces reveal a self-limited hydrogenation process. The electronic properties of the GNR/Au(111) system can be modified by edge and basal-plane hydrogenation, and a mechanism for the hydrogenation process is proposed.
Article
Chemistry, Multidisciplinary
Yanwei Gu, Zijie Qiu, Klaus Muellen
Summary: This article introduces nanographenes and graphene nanoribbons as ideal examples that connect the world of molecules with bulk carbon materials. It emphasizes the precision structural control achieved through modern synthesis methods. In addition to their molecular-level properties, self-assembly and thin-film structures also play a significant role.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Wenjing Bo, Yi Zou, Jingang Wang
Summary: Graphene nanoribbons (GNRs), as representatives of nano-graphene materials, possess novel electrical properties, highly adjustable electronic properties, and optoelectronic properties due to their diverse geometric structures and atomic precision configurations. The electrical properties and band gaps of GNRs are influenced by factors such as width, length, boundary configuration, and elemental doping. With advancements in preparation technology, an increasing number of GNRs with different configurations are being produced, offering new possibilities for applications in microelectronics.
Article
Chemistry, Physical
G. Flores-Rangel, L. F. Lastras-Martinez, R. Castro-Garcia, O. Ruiz-Cigarrillo, R. E. Balderas-Navarro, L. D. Espinosa-Cuellar, A. Lastras-Martinez, J. M. J. Lopes
Summary: Graphene nanoribbons (GNRs) are unique structures with interesting optical and electronic properties that have great potential in optoelectronics and nanoelectronics. Utilizing a differential reflectance contrast (DRC) technique can accurately evaluate the thickness and uniformity of GNRs. Studying GNRs on SiC substrates provides a promising method for the development of graphene-based nanoelectronics.
APPLIED SURFACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Song Jiang, Tomas Neuman, Alex Boeglin, Fabrice Scheurer, Guillaume Schull
Summary: In this study, the intrinsic optoelectronic properties of graphene nanoribbons (GNRs) were explored using a scanning tunneling microscope-based method. By transferring the GNRs onto a partially insulating surface, luminescence quenching effects were prevented and localized dark excitons associated with the topological end states of the GNRs were observed.
Article
Chemistry, Physical
Satish S. Badadhe, Poonam Yadav, Sachin Suryawanshi, Mahendra A. More
Summary: Carbon nanofibers and hybrid nanocomposites were synthesized using electrospinning technique and characterized for their physico-chemical properties. The hybrid nanocomposites CNF-Sn and C-Sn showed significantly improved field emission behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Sachin R. Suryawanshi, Raju T. Shisode, Krishna K. Jagtap, Dattatray J. Late, Sharad S. Suryavanshi, Mahendra A. More
Summary: Pulsed laser deposition was used to deposit a thin adherent coating of HfO2 nanoparticles on Cu2O nanowires, forming a hierarchical assembly of HfO2-Cu2O. The optimized PLD process parameters led to the desired hierarchical morphology, and a plausible growth mechanism was proposed based on SEM results and literature survey. Field emission testing showed that the HfO2-Cu2O hierarchical assembly exhibited superior behavior compared to pristine Cu2O nanowires, highlighting the potential of PLD for fabricating hierarchical structures for novel applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Review
Chemistry, Physical
Aaryashree, Surjit Sahoo, Pravin Walke, Saroj Kumar Nayak, Chandra Sekhar Rout, Dattatray J. Late
Summary: The future of electronics technology will be primarily based on wearable sensing systems, with wearable electronic sensors that do not require external power sources being crucial for portable and mobile applications. This review article presents the recent progress of wearable self-powered smart chemical sensors systems, as well as an overview of various energy conversion and storage technologies for self-powered devices.
Article
Chemistry, Physical
Shobhnath P. Gupta, Mahendra A. More, Dattatray J. Late, Pravin S. Walke
Summary: The study demonstrates the achievement of extraordinary power and energy density through intercalated pseudocapacitance, utilizing a novel structure composed of orthorhombic hydrated WO3 nanorods and reduced graphene oxide. This structure exhibits high specific capacitance and outstanding performance, showing great prospects for significant advancements in practical applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Rutuparna Samal, Mahima Bhat, Samadhan Kapse, Ranjit Thapa, Dattatray J. Late, Chandra Sekhar Rout
Summary: The study focuses on the synthesis of transition metal selenides MnSe2 and its hybrid with multiwalled carbon nanotubes (MWCNTs) for superior electrochemical performance in supercapacitors, demonstrating enhanced energy storage efficiency and long-term stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Ajay Kumar, Dnyandeo Pawar, Dattatray J. Late, Rajesh Kanawade
Summary: This study proposes and investigates a Fabry-Perot Interferometer-based polyvinyl alcohol-coated sensor platform for non-invasive detection of acetone vapor at room temperature, for the prospective study of diabetes diagnosis. The sensor is simple, miniaturized, flexible, cost-effective, and highly sensitive for low acetone vapor concentration detection.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Review
Chemistry, Multidisciplinary
Manila Ozhukil Valappil, Subbiah Alwarappan, Vijayamohanan K. Pillai
Summary: Phosphorene quantum dots (PQDs) are unique zero-dimensional nanostructures with special physicochemical and surface properties. Considerable progress has been made in PQD research in catalysis, particularly in the fields of photocatalysis and electrocatalysis. This review systematically summarizes the synthesis methods and physicochemical properties of PQDs, and critically discusses their potential applications and future prospects in catalysis.
Editorial Material
Chemistry, Physical
Dattatray J. Late, Steffen Duhm
ELECTRONIC STRUCTURE
(2022)
Article
Chemistry, Physical
Monidipa Pramanik, Mukta V. V. Limaye, Mahendra S. Pawar, Dattatray J. Late, Shashi B. Singh
Summary: In this study, vanadium carbide (V(2C)Tx) MXene was successfully synthesized and treated with an ammonia solution under different pressures using a hydrothermal process. The results show that the morphology of V(2)CTx MXene changed from uneven multilayered micrometre-size sheets to uniform few-layered nanometer-size sheets as the pressure increased. The optical and electronic properties were influenced by nitrogen-related defects, quantum confinement, and induced lattice strain due to the post-ammonia treatment.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Prashant H. Shinde, Yogita Padwal, Sanjeewani R. Bansode, Ratna Chauhan, Shrikant Charhate, Rishi B. Sharma, Hassan Fouad, Chiaki Terashima, Suresh W. Gosavi, Dattatray J. Late
Summary: The zinc sulphide-reduced graphene oxide nanocomposite has been synthesized and investigated for its potential use in photocatalysis for dye degradation. The combination of ZnS and rGO results in enhanced photocatalytic properties, with rGO acting as a support for ZnS nanoparticles and preventing their agglomeration.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Prashant H. Shinde, Yogita Padwal, Yogesh Waghadkar, Hassan Fouad, Chiaki Terashima, Ratna Chauhan, Shrikant Charhate, Muthupandian Ashokkumar, Suresh W. Gosavi, Dattatray J. Late
Summary: We have successfully synthesized ZnS-MoS2 nano-heterostructure via hydrothermal method and studied its photocatalytic activity under sunlight. The nano-heterostructure exhibited efficient charge separation and extended light absorption, leading to the generation of electron-hole pairs for the degradation of MB dye molecules. The optimized ZnS-MoS2 sample synthesized at 48 h showed excellent performance with 97% degradation in 30 min, attributed to enhanced crystallinity, good charge carrier ability, optimal heterojunction formation, and well-defined morphology with reduced defects.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Bikash Ranjan Isaac, Subbiah Alwarappan, Vijayamohanan K. Pillai
Summary: In this study, a transformation of multiwalled carbon nanotubes to graphene nanoribbons and graphene quantum dots was achieved through an ionic liquid-assisted electrochemical approach. The tunability of interlayer spacing and the introduction of heteroatoms in carbon nanotubes could significantly impact the mechanical and electrical properties of the resulting nanoribbons. This research highlights the importance of van der Waals gap engineering in designing advanced 2D materials and their composites for various applications.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Chiteri Gautam, Devyani Srivastava, Gabriele Kociok-Kohn, Suresh W. Gosavi, Vinod K. Sharma, Ratna Chauhan, Dattatray J. Late, Abhinav Kumar, Mohd. Muddassir
Summary: Two Schiff base complexes, [CuL2] (Cu-Sal) and [CoL3] (Co-Sal), were synthesized and characterized. Crystal structure analysis showed a square planar geometry around Cu(ii) and various intermolecular non-covalent interactions in Cu-Sal. Both complexes were used as sensitizers in TiO2 based dye sensitized solar cells (DSSCs), and Co-Sal exhibited better photovoltaic performance than Cu-Sal due to improved light absorption and dye loading.
Proceedings Paper
Engineering, Electrical & Electronic
Mahendra S. Pawar, Mahendra A. More, Dattatray J. Late
Summary: Researchers have grown PtSe2 nanosheets on Si substrate using a chemical method followed by thermal annealing in an inert atmosphere. Structural and morphological investigations were conducted using Raman spectroscopy and TEM. Field emission studies revealed that PtSe2 nanosheets exhibited a turn on field of 5.4 V/mu m and a FE current density of 505 mu A/cm(2) under ultrahigh vacuum conditions, with emission current stability observed over a period of more than 5 hours.
2021 34TH INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE (IVNC)
(2021)
Review
Materials Science, Multidisciplinary
Abhinandan Patra, Mahendra A. More, Dattatray J. Late, Chandra Sekhar Rout
Summary: 2D layered materials are considered revolutionary in modern device technology, offering tunable electronic, thermal, and mechanical properties that make them ideal for high-performance vacuum micro/nanoelectronic devices. The enhanced field emission characteristics of inorganic 2D materials, achieved through various methodologies such as phase engineering and defect engineering, have positioned them as potential candidates for flexible displays and miniaturized X-ray tubes.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Mahendra S. Pawar, Sunil R. Kadam, Bharat B. Kale, Dattatray J. Late
Summary: The CdMoS4 hierarchical nanostructures showed better response to UV light in terms of photoresponsivity, response time (around 72 s) and recovery time (around 94 s) compared to the MoS2 device, indicating the practicality of CdMoS4 in enhancing device performance.
NANOSCALE ADVANCES
(2021)
