Search results for: Dmitri Golberg

Items from 1 to 20 out of 191 results

article

Hydrogen Storage in Carbon and Oxygen Co‐Doped Porous Boron Nitrides

Qunhong Weng, Lula Zeng, Zhiwei Chen, Yuxin Han, more

Advanced Functional Materials > 31 > 4 > n/a - n/a

Fuel cell vehicles powered by hydrogen are particularly attractive and competitive among rapidly developing new energy‐driven automobiles. One critical problem for this type of vehicles is the high cost for hydrogen storage due to the lack of efficient and low‐pressure hydrogen storage technologies. In the frame of development of hydrogen physisorption‐relied materials, attention has mostly been paid...

article

Engineering Platinum–Oxygen Dual Catalytic Sites via Charge Transfer towards Highly Efficient Hydrogen Evolution

Fei Lu, Ding Yi, Shoujie Liu, Fei Zhan, more

Angewandte Chemie International Edition > 59 > 40 > 17712 - 17718

A dual‐site catalyst allows for a synergetic reaction in the close proximity to enhance catalysis. It is highly desirable to create dual‐site interfaces in single‐atom system to maximize the effect. Herein, we report a cation‐deficient electrostatic anchorage route to fabricate an atomically dispersed platinum–titania catalyst (Pt₁^O1/Ti_1−xO₂), which shows greatly enhanced hydrogen evolution activity,...

article

Engineering Platinum–Oxygen Dual Catalytic Sites via Charge Transfer towards Highly Efficient Hydrogen Evolution

Fei Lu, Ding Yi, Shoujie Liu, Fei Zhan, more

Angewandte Chemie > 132 > 40 > 17865 - 17871

article

True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

Nilesh R. Chodankar, Hong Duc Pham, Ashok Kumar Nanjundan, Joseph F. S. Fernando, more

Small > 16 > 37 > n/a - n/a

The development of pseudocapacitive materials for energy‐oriented applications has stimulated considerable interest in recent years due to their high energy‐storing capacity with high power outputs. Nevertheless, the utilization of nanosized active materials in batteries leads to fast redox kinetics due to the improved surface area and short diffusion pathways, which shifts their electrochemical signatures...

article

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

Chao Zhang, Konstantin L. Firestein, Joseph F. S. Fernando, Dumindu Siriwardena, more

Advanced Materials > 32 > 18 > n/a - n/a

In situ transmission electron microscopy (TEM) is one of the most powerful approaches for revealing physical and chemical process dynamics at atomic resolutions. The most recent developments for in situ TEM techniques are summarized; in particular, how they enable visualization of various events, measure properties, and solve problems in the field of energy by revealing detailed mechanisms at the...

article

Zinc‐Tiered Synthesis of 3D Graphene for Monolithic Electrodes

Xiang‐Fen Jiang, Ruiqing Li, Ming Hu, Zheng Hu, more

Advanced Materials > 31 > 25 > n/a - n/a

A high‐surface‐area conductive cellular carbon monolith is highly desired as the optimal electrode for achieving high energy, power, and lifetime in electrochemical energy storage. 3D graphene can be regarded as a first‐ranking member of cellular carbons with the pore‐wall thickness down to mono/few‐atomic layers. Current 3D graphenes, derived from either gelation or pyrolysis routes, still suffer...

article

Size Effects on the Mechanical Properties of Nanoporous Graphene Networks

Dai‐Ming Tang, Cui‐Lan Ren, Ling Zhang, Ying Tao, more

Advanced Functional Materials > 29 > 19 > n/a - n/a

It is essential to understand the size scaling effects on the mechanical properties of graphene networks to realize the potential mechanical applications of graphene assemblies. Here, a “highly dense‐yet‐nanoporous graphene monolith (HPGM)” is used as a model material of graphene networks to investigate the dependence of mechanical properties on the intrinsic interplanar interactions and the extrinsic...

article

Tunable Mechanical and Electrical Properties of Coaxial BN‐C Nanotubes

Xin Zhou, Feng‐Chun Hsia, Yanming Xue, Dai‐Ming Tang, more

physica status solidi (RRL) – Rapid Research Letters > 13 > 3 > n/a - n/a

Heterostructures provide a great chance to tune the properties and functions of a nanomaterial, e.g., its mechanical and electrical properties, and thus allowing for the design and realization of novel nanoelectromechanical devices. Boron nitride and carbon nanotubes, with similar structure and mechanical properties but dramatically different electrical properties, are ideal candidates for investigating...

article

Electronic and Optical Properties of 2D Materials Constructed from Light Atoms

Qunhong Weng, Guodong Li, Xinliang Feng, Kornelius Nielsch, more

Advanced Materials > 30 > 46 > n/a - n/a

Boron, carbon, nitrogen, and oxygen atoms can form various building blocks for further construction of structurally well‐defined 2D materials (2DMs). Both in theory and experiment, it has been documented that the electronic structures and optical properties of 2DMs are well tunable through a rational design of the material structure. Here, the recent progress on 2DMs that are composed of B, C, N,...

article

Densely Interconnected Porous BN Frameworks for Multifunctional and Isotropically Thermoconductive Polymer Composites

Yanming Xue, Xin Zhou, Tianzhuo Zhan, Baozhen Jiang, more

Advanced Functional Materials > 28 > 29 > n/a - n/a

Ideal materials for modern electronics packaging should be highly thermoconductive. This may be achieved through designing multifunctional polymer composites. Such composites may generally be achieved via effective embedment of functional inorganic fillers into desirable polymeric bodies. Herein, two types of high‐performance 3D h‐BN porous frameworks (3D‐BN), namely, h‐BN nanorod‐assembled networks...

article

Optical and Optoelectronic Property Analysis of Nanomaterials inside Transmission Electron Microscope

Joseph F. S. Fernando, Chao Zhang, Konstantin L. Firestein, Dmitri Golberg

Small > 13 > 45 > n/a - n/a

In situ transmission electron microscopy (TEM) allows one to investigate nanostructures at high spatial resolution in response to external stimuli, such as heat, electrical current, mechanical force and light. This review exclusively focuses on the optical, optoelectronic and photocatalytic studies inside TEM. With the development of TEMs and specialized TEM holders that include in situ illumination...

article

Few-atomic-layered hexagonal boron nitride: CVD growth, characterization, and applications

Majharul Haque Khan, Hua Kun Liu, Xudong Sun, Yusuke Yamauchi, more

Materials Today > 2017 > 20 > 10 > 611-628

Two-dimensional (2D) materials have shown outstanding properties that make them the materials of choice for future semiconductor and flexible nanoelectronics. Hexagonal boron nitride nanosheet (BNNS) is one of the most studied 2D materials due to its extraordinary properties and potential applications. The synthesis of large, homogeneous, and few-layered BNNS, however, remains challenging. Among the...

article

Boron nitride nanotube-based amphiphilic hybrid nanomaterials for superior encapsulation of hydrophobic cargos

Doaa Abu Saleh, Jukka Niskanen, Yanming Xue, Dmitri Golberg, more

Materials Today Chemistry > 2017 > 6 > C > 45-50

We report an organic-inorganic hybrid core-shell nanomaterial obtained by conjugation of an amphiphilic monomethoxy-poly(ethylene glycol)-b-poly(epsilon-caprolactone) diblock copolymer to hydroxylated boron nitride nanotubes (BNNTs). The extent of copolymer grafting reached 64% w/w, an exceptionally high value. The hybrid materials exhibit excellent physical stability in water and an outstanding loading...

article

In Situ Electrochemistry of Rechargeable Battery Materials: Status Report and Perspectives

Yijun Yang, Xizheng Liu, Zhonghua Dai, Fangli Yuan, more

Advanced Materials > 29 > 31 > n/a - n/a

The development of rechargeable batteries with high performance is considered to be a feasible way to satisfy the increasing needs of electric vehicles and portable devices. It is of vital importance to design electrodes with high electrochemical performance and to understand the nature of the electrode/electrolyte interfaces during battery operation, which allows a direct observation of the complicated...

article

Tuning of the Optical, Electronic, and Magnetic Properties of Boron Nitride Nanosheets with Oxygen Doping and Functionalization

Qunhong Weng, Dmitry G. Kvashnin, Xi Wang, Ovidiu Cretu, more

Advanced Materials > 29 > 28 > n/a - n/a

Engineering of the optical, electronic, and magnetic properties of hexagonal boron nitride (h‐BN) nanomaterials via oxygen doping and functionalization has been envisaged in theory. However, it is still unclear as to what extent these properties can be altered using such methodology because of the lack of significant experimental progress and systematic theoretical investigations. Therefore, here,...

article

Improved Li⁺ Storage through Homogeneous N‐Doping within Highly Branched Tubular Graphitic Foam

Jinyang Dong, Yanming Xue, Chao Zhang, Qunhong Weng, more

Advanced Materials > 29 > 6 > n/a - n/a

A novel carbon structure, highly branched homogeneous‐N‐doped graphitic (BNG) tubular foam, is designed via a novel N, N‐dimethylformamide (DMF)‐mediated chemical vapor deposition method. More structural defects are found at the branched portions as compared with the flat tube domains providing abundant active sites and spacious reservoirs for Li⁺ storage. An individual BNG branch nanobattery is constructed...

article

Nano-micro-porous skutterudites with 100% enhancement in ZT for high performance thermoelectricity

Atta U. Khan, Kazuaki Kobayashi, Dai-Ming Tang, Yusuke Yamauchi, more

Nano Energy > 2017 > 31 > C > 152-159

Increasing energy demands require new materials, e.g., thermoelectrics, for efficient energy conversion of fossil fuels. However, their low figure of merit (ZT) limits widespread applications. Nanostructuring has been an effective way of lowering the thermal conductivity. However, grain growth at elevated temperature is still a big concern, for otherwise expected to be long-lasting thermoelectric...

chapter

In Situ TEM Electrical and Mechanical Probing of Individual Multi-walled Boron Nitride Nanotubes

Dmitri Golberg, Pedro M. F. J. Costa, Masanori Mitome, Yoshio Bando

Topics in Applied Physics > Inorganic and Metallic Nanotubular Materials > 275-286

Measurements of electrical and mechanical properties of individual multi-walled BN nanotubes inside a high-resolution transmission electron microscope are presented.

article

In situ cyclic telescoping of multi-walled carbon nanotubes in a transmission electron microscope

Katherine Elizabeth Moore, Ovidiu Cretu, Masanori Mitome, Dmitri Golberg

Carbon > 2016 > 107 > C > 225-232

In this work, we study the cyclic telescoping of multi-walled carbon nanotubes (MWCNTs) inside a high-resolution transmission electron microscope. The nanotubes are observed in real time, while simultaneously measuring their electrical properties. Experiments are conducted by first ‘sharpening’ a MWCNT by approaching it with a piezo-controlled tungsten tip and applying a single voltage pulse. This...

article

Engineering sulfur vacancies and impurities in NiCo2S4 nanostructures toward optimal supercapacitive performance

Fei Lu, Min Zhou, Wanrong Li, Qunhong Weng, more

Nano Energy > 2016 > 26 > C > 313-323

High efficiency supercapacitors require the electrode materials which integrate high specific capacitance, favorable rate capability and long-term cyclic stability. These features are often associated with vacancies and impurities in the electrodes. Understanding the mechanism behind the related process provides a deep insight into improved supercapacitive performance. Here we present the synthesis...

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BORON NITRIDE NANOTUBES (9)
TRANSMISSION ELECTRON MICROSCOPY (6)
ALUMINUM (5)
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NANOSTRUCTURES (5)
ZNO (5)
GRAPHENE (4)
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NANOWIRES (4)
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SENSORS (4)
TENSILE STRENGTH (4)
CARBON NANOTUBES (3)
CDS (3)
DOPING (3)
HETEROJUNCTIONS (3)
IN SITU TEM (3)
IN-SITU TEM (3)
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PHOTOCONDUCTIVITY (3)
SEMICONDUCTORS (3)
SOLAR CELLS (3)
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ULTRAVIOLET PHOTODETECTOR (3)
2D MATERIALS (2)
APPLICATIONS (2)
BANDGAPS (2)
BATTERIES (2)
BN NANOSHEET (2)
BN NANOTUBES (2)
BRANCHED HETEROSTRUCTURE (2)
CARBON NANOTUBE (2)
CATHODOLUMINESCENCE (2)
CHARGE TRANSFER (2)
CHARGE TRANSPORT (2)
CHEMICAL BLOWING (2)
COMPOSITE (2)
COMPOSITES (2)
CRYSTALLIZATION (2)
DUAL-SITE CATALYSTS (2)
ELECTRICAL CHARACTERISTICS (2)
ELECTRICAL PROPERTIES (2)
ELECTRICAL TRANSPORT (2)
EXCELLENT PERFORMANCE (2)
FIELD EMISSION (2)
FIELD‐EFFECT TRANSISTORS (2)
FLEXIBLE (2)
FLEXIBLE ELECTRONICS (2)
FUNCTIONALIZATION (2)
HOLLOW (2)
HYDROGEN EVOLUTION REACTION (2)
INTERNAL FRICTION (2)
MECHANICAL PROPERTIES (2)
NANODEVICES (2)
NANOFIBERS (2)
NANOPARTICLE (2)
ONE‐DIMENSIONAL NANOSTRUCTURES (2)
OPERANDO TECHNIQUES (2)
OPTOELECTRONICS (2)
RECHARGEABLE BATTERIES (2)
RESPONSIVITY (2)
SNSE2 (2)
SOLAR CELL (2)
SOLAR‐BLIND PHOTODETECTOR (2)
SPARK PLASMA SINTERING (2)
SUPERCAPACITOR (2)
SURFACE MORPHOLOGY (2)
SURFACE ROUGHNESS (2)
SYNERGY (2)
THERMAL CONDUCTIVITY (2)
TIME‐RESOLVED FLUORESCENCE SPECTROSCOPY (2)
TRIPLE‐YOLKED (2)
VISIBLE LIGHT (2)
WETTING (2)
ZINC SULFIDE (2)
ZN2GEO4 NANOWIRES (2)
ZNS‐ZNO (2)
2D STRUCTURES (1)
3D ASSEMBLY (1)
3D GRAPHENE FOAM (1)
61.72.CC (1)
61.80.JH (1)
81.07.DC (1)
A. BN NANOTUBE (1)
A. CARBON NANOTUBES (1)
A. NANOSTRUCTURES (1)
A. SEMICONDUCTORS (1)
ARSENIC ADSORPTION (1)
ASYMMETRIC SUPERCAPACITORS (1)
B. CHEMICAL SYNTHESIS (1)
B. CHEMICAL VAPOUR DEPOSITION (1)
BANDGAP (1)
BANDGAP ENGINEERING (1)
BATTERY MATERIALS (1)
BIAS REGIME (1)
BN POROUS FRAMEWORKS (1)
BNNT GROWTH MECHANISM (1)
BN‐C NANOTUBES (1)
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INFONA - science communication portal

Search results for: Dmitri Golberg

Hydrogen Storage in Carbon and Oxygen Co‐Doped Porous Boron Nitrides

Engineering Platinum–Oxygen Dual Catalytic Sites via Charge Transfer towards Highly Efficient Hydrogen Evolution

Engineering Platinum–Oxygen Dual Catalytic Sites via Charge Transfer towards Highly Efficient Hydrogen Evolution

True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

Zinc‐Tiered Synthesis of 3D Graphene for Monolithic Electrodes

Size Effects on the Mechanical Properties of Nanoporous Graphene Networks

Tunable Mechanical and Electrical Properties of Coaxial BN‐C Nanotubes

Electronic and Optical Properties of 2D Materials Constructed from Light Atoms

Densely Interconnected Porous BN Frameworks for Multifunctional and Isotropically Thermoconductive Polymer Composites

Optical and Optoelectronic Property Analysis of Nanomaterials inside Transmission Electron Microscope

Few-atomic-layered hexagonal boron nitride: CVD growth, characterization, and applications

Boron nitride nanotube-based amphiphilic hybrid nanomaterials for superior encapsulation of hydrophobic cargos

In Situ Electrochemistry of Rechargeable Battery Materials: Status Report and Perspectives

Tuning of the Optical, Electronic, and Magnetic Properties of Boron Nitride Nanosheets with Oxygen Doping and Functionalization

Improved Li⁺ Storage through Homogeneous N‐Doping within Highly Branched Tubular Graphitic Foam

Nano-micro-porous skutterudites with 100% enhancement in ZT for high performance thermoelectricity

In Situ TEM Electrical and Mechanical Probing of Individual Multi-walled Boron Nitride Nanotubes

In situ cyclic telescoping of multi-walled carbon nanotubes in a transmission electron microscope

Engineering sulfur vacancies and impurities in NiCo2S4 nanostructures toward optimal supercapacitive performance

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