Search results for: Jianwei Miao

Items from 1 to 20 out of 28 results

article

Hollow Ptychography: Toward Simultaneous 4D Scanning Transmission Electron Microscopy and Electron Energy Loss Spectroscopy

Na Yeon Kim, Shaohong Cao, Karren L. More, Andrew R. Lupini, more

Small > 19 > 37 > n/a - n/a

With the recent development of high‐acquisition‐speed pixelated detectors, 4D scanning transmission electron microscopy (4D‐STEM) is becoming routinely available in high‐resolution electron microscopy. 4D‐STEM acts as a “universal” method that provides local information on materials that is challenging to extract from bulk techniques. It extends conventional STEM imaging to include super‐resolution...

article

Synthesis of surface controlled nickel/palladium hydride nanodendrites with high performance in benzyl alcohol oxidation

Zipeng Zhao, Michelle M. Flores Espinosa, Jihan Zhou, Wang Xue, more

Nano Research > 2019 > 12 > 6 > 1467-1472

Benzaldehyde byproduct is an imperative intermediate in the production of fine chemicals and additives. Tuning selectivity to benzaldehyde is therefore critical in alcohol oxidation reactions at the industrial level. Herein, we report a simple but innovative method for the synthesis of palladium hydride and nickel palladium hydride nanodendrites with controllable morphology, high stability, and excellent...

article

An Earth‐Abundant Catalyst‐Based Seawater Photoelectrolysis System with 17.9% Solar‐to‐Hydrogen Efficiency

Shao‐Hui Hsu, Jianwei Miao, Liping Zhang, Jiajian Gao, more

Advanced Materials > 30 > 18 > n/a - n/a

The implementation of water splitting systems, powered by sustainable energy resources, appears to be an attractive strategy for producing high‐purity H₂ in the absence of the release of carbon dioxide (CO₂). However, the high cost, impractical operating conditions, and unsatisfactory efficiency and stability of conventional methods restrain their large‐scale development. Seawater covers 70% of the...

article

Fabrication of 3D mesoporous networks of assembled CoO nanoparticles for efficient photocatalytic reduction of aqueous Cr(VI)

Georgia Velegraki, Jianwei Miao, Charalampos Drivas, Bin Liu, more

Applied Catalysis B: Environmental > 2018 > 221 > C > 635-644

Synthesis of high-performance and cyclic stable photocatalysts has been remaining a significant challenge. In this work, we report the synthesis of high-surface-area mesoporous networks of CoO NPs through a polymer-templating self-assembly method and demonstrate their potential application in the reductive detoxification of aqueous Cr(VI) solutions under UV and visible light irradiation. Electron...

article

A streaming multi-GPU implementation of image simulation algorithms for scanning transmission electron microscopy

Alan Pryor, Colin Ophus, Jianwei Miao

Advanced Structural and Chemical Imaging > 2017 > 3 > 1 > 1-14

Simulation of atomic-resolution image formation in scanning transmission electron microscopy can require significant computation times using traditional methods. A recently developed method, termed plane-wave reciprocal-space interpolated scattering matrix (PRISM), demonstrates potential for significant acceleration of such simulations with negligible loss of accuracy. Here, we present a software...

article

Sustainable hydrogen and chemical production via photo-electrochemical reforming of biomass-derived alcohols

Liping Zhang, Rong Chen, Jianqiang Luo, Jianwei Miao, more

Nano Research > 2016 > 9 > 11 > 3388-3393

Hydrogen production from steam or autothermal alcohol reforming has been widely studied, but these methods require high temperatures and emit CO₂. Here, we present a new strategy for the simultaneous room-temperature production of hydrogen and other chemicals without the emission of CO₂, via the photoelectrochemical reforming of biomass-derived alcohols. The measured hydrogen quantum efficiencies...

article

Cadmium selenide-sensitized upright-standing mesoporous zinc oxide nanosheets for efficient photoelectrochemical H2 production

Jianwei Miao, Bin Liu

Journal of Energy Chemistry > 2016 > 25 > 3 > 371-374

Cadmium selenide (CdSe)-sensitized upright-standing mesoporous zinc oxide (ZnO) nanosheets were prepared via a chemical bath deposition followed by annealing and electrochemical deposition of CdSe quantum dots (QDs). The CdSe QDs absorb visible photons under sunlight illumination, promoting electrons from the valence band to the conduction band of CdSe, which then quickly transfer to ZnO followed...

chapter

Lensless Microscopy and Holography with 60 nm Resolution using Tabletop Coherent Soft X-Rays

Daisy A. Raymondson, Richard L. Sandberg, William F. Schlotter, Kevin Raines, more

Springer Series in Chemical Physics > Ultrafast Phenomena XVI > Ultrafast X-ray and Electron Science > 146-148

We demonstrate high numerical aperture lensless diffractive imaging and Fourier transform holography using high harmonic generation from an ultrafast laser system. The HHG source operates at 29 nm or 13 nm wavelength and achieves 60 nm resolution.

article

Surface Rutilization of Anatase TiO₂ Nanorods for Creation of Synergistically Bridging and Fencing Electron Highways

Jiazang Chen, Hong Bin Yang, Hua Bing Tao, Liping Zhang, more

Advanced Functional Materials > 26 > 3 > 456 - 465

In a photoelectrochemical cell, the most concerned issue in the nanostructured TiO₂ electrode is the charge transport, which consists of the internal movement of electrons in TiO₂ nanostructures and the intergrain charge transfer. Here, inspired by electrochemical studies on different polymorphs of TiO₂, it is proposed to bridge the adjacent building blocks and fence the electron transport highways...

article

Phase Retrieval with Application to Optical Imaging: A contemporary overview

Yoav Shechtman, Yonina C. Eldar, Oren Cohen, Henry Nicholas Chapman, more

IEEE Signal Processing Magazine > 2015 > 32 > 3 > 87 - 109

ï»¿The problem of phase retrieval, i.e., the recovery of a function given the magnitude of its Fourier transform, arises in various fields of science and engineering, including electron microscopy, crystallography, astronomy, and optical imaging. Exploring phase retrieval in optical settings, specifically when the light originates from a laser, is natural since optical detection devices [e.g., charge-coupled...

article

Metal‐Cluster‐Decorated TiO₂ Nanotube Arrays: A Composite Heterostructure toward Versatile Photocatalytic and Photoelectrochemical Applications

Fang‐Xing Xiao, Sung‐Fu Hung, Jianwei Miao, Hsin‐Yi Wang, more

Small > 11 > 5 > 554 - 567

Recent years have witnessed increasing interest in the solution‐phase synthesis of atomically precise thiolate‐protected gold clusters (Au_x); nonetheless, research on the photocatalytic properties of Au_x–semiconductor nanocomposites is still in its infancy. In this work, recently developed glutathione‐capped gold clusters and highly ordered nanoporous layer‐covered TiO₂ nanotube arrays (NP‐TNTAs)...

article

TiO₂ Nanotubes: Metal‐Cluster‐Decorated TiO₂ Nanotube Arrays: A Composite Heterostructure toward Versatile Photocatalytic and Photoelectrochemical Applications (Small 5/2015)

Fang‐Xing Xiao, Sung‐Fu Hung, Jianwei Miao, Hsin‐Yi Wang, more

Small > 11 > 5 > 553 - 553

Glutathione‐capped gold clusters and highly ordered nanoporous layer‐covered TiO₂ nanotube arrays (NP‐TNTAs) are employed as nanobuilding blocks for a well‐defined Au/NP‐TNTA heterostructure via electrostatic self‐assembly. On page 554, B. Liu and co‐workers show how tailor‐made Au clusters are evenly distributed on the interior and exterior surfaces of the framework. Versatile photocatalytic performances...

article

Celebrating the past, looking to the future

Simon J. L. Billinge, Jianwei Miao

Acta Crystallographica Section A > 71 > 1 > 1 - 2

article

Threading Chalcogenide Layers with Polymer Chains

Wei‐Wei Xiong, Jianwei Miao, Kaiqi Ye, Yue Wang, more

Angewandte Chemie > 127 > 2 > 556 - 560

Inserting polymers into a crystalline inorganic matrix to understand the structure, position, and the structure–property relationships of the resulting composites is important for designing new inorganic‐organic materials and tuning their properties. Single crystals of polymer‐chalcogenide composites were successfully prepared by trapping polyethyleneglycol within a selenidostannate matrix under surfactant‐thermal...

article

Threading Chalcogenide Layers with Polymer Chains

Wei‐Wei Xiong, Jianwei Miao, Kaiqi Ye, Yue Wang, more

Angewandte Chemie International Edition > 54 > 2 > 546 - 550

article

A flexible high-performance oxygen evolution electrode with three-dimensional NiCo2O4 core-shell nanowires

Rong Chen, Hsin-Yi Wang, Jianwei Miao, Hongbin Yang, more

Nano Energy > 2015 > 11 > C > 333-340

Three-dimensional NiCo₂O₄ core-shell nanowires made up of NiCo₂O₄ nanowire core and NiCo₂O₄ nanoflake shell have been fabricated by a simple two-step wet chemical method on flexible conductive carbon cloth substrate for oxygen evolution reaction (OER). The combination of high surface area, enhanced mass and charge transport as well as three-dimensional conducting pathway enables superior oxygen evolution...

article

{[M(NH3)6][Ag4M4Sn3Se13]}∞ (M=Zn, Mn): Three-dimensional chalcogenide frameworks constructed from quaternary metal selenide clusters with two different transition metals

Wei-Wei Xiong, Jianwei Miao, Pei-Zhou Li, Yanli Zhao, more

Journal of Solid State Chemistry > 2014 > 218 > Complete > 146-150

Herein we report solvothermal syntheses of two new three-dimensional chalcogenide frameworks {[M(NH ₃ ) ₆ ][Ag ₄ M ₄ Sn ₃ Se ₁₃ ]} _n (M=Zn (1), Mn (2)), which consist of quaternary metal selenide clusters with two different transition metals. The compounds represent the first Ag–Zn/Mn–Sn–Se based quaternary anionic frameworks. The optical studies...

article

A new vision for Acta Crystallographica Section A

Simon J. L. Billinge, Jianwei Miao

Acta Crystallographica Section A > 69 > 6 > 533 - 534

article

Studies of Materials at the Nanometer Scale Using Coherent X-Ray Diffraction Imaging

Richard L. Sandberg, Zhifeng Huang, Rui Xu, Jose A. Rodriguez, more

JOM > 2013 > 65 > 9 > 1208-1220

For many years, x-ray microscopy has been attractive for materials studies with its ability to image thick samples and provide nanometer-scale resolution. However, the ability to manufacture high-resolution x-ray optics has been a hurdle to achieving the full potential of diffraction limited x-ray imaging. Recently, the advent of bright and coherent x-ray sources at synchrotrons and x-ray free electron...

article

Emerging opportunities in structural biology with X-ray free-electron lasers

Ilme Schlichting, Jianwei Miao

Current Opinion in Structural Biology > 2012 > 22 > 5 > 613-626

X-ray free-electron lasers (X-FELs) produce X-ray pulses with extremely brilliant peak intensity and ultrashort pulse duration. It has been proposed that radiation damage can be ‘outrun’ by using an ultra intense and short X-FEL pulse that passes a biological sample before the onset of significant radiation damage. The concept of ‘diffraction-before-destruction’ has been demonstrated recently at the...

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INFONA - science communication portal

Search results for: Jianwei Miao

Hollow Ptychography: Toward Simultaneous 4D Scanning Transmission Electron Microscopy and Electron Energy Loss Spectroscopy

Synthesis of surface controlled nickel/palladium hydride nanodendrites with high performance in benzyl alcohol oxidation

An Earth‐Abundant Catalyst‐Based Seawater Photoelectrolysis System with 17.9% Solar‐to‐Hydrogen Efficiency

Fabrication of 3D mesoporous networks of assembled CoO nanoparticles for efficient photocatalytic reduction of aqueous Cr(VI)

A streaming multi-GPU implementation of image simulation algorithms for scanning transmission electron microscopy

Sustainable hydrogen and chemical production via photo-electrochemical reforming of biomass-derived alcohols

Cadmium selenide-sensitized upright-standing mesoporous zinc oxide nanosheets for efficient photoelectrochemical H2 production

Lensless Microscopy and Holography with 60 nm Resolution using Tabletop Coherent Soft X-Rays

Surface Rutilization of Anatase TiO₂ Nanorods for Creation of Synergistically Bridging and Fencing Electron Highways

Phase Retrieval with Application to Optical Imaging: A contemporary overview

Metal‐Cluster‐Decorated TiO₂ Nanotube Arrays: A Composite Heterostructure toward Versatile Photocatalytic and Photoelectrochemical Applications

TiO₂ Nanotubes: Metal‐Cluster‐Decorated TiO₂ Nanotube Arrays: A Composite Heterostructure toward Versatile Photocatalytic and Photoelectrochemical Applications (Small 5/2015)

Celebrating the past, looking to the future

Threading Chalcogenide Layers with Polymer Chains

Threading Chalcogenide Layers with Polymer Chains

A flexible high-performance oxygen evolution electrode with three-dimensional NiCo2O4 core-shell nanowires

{[M(NH3)6][Ag4M4Sn3Se13]}∞ (M=Zn, Mn): Three-dimensional chalcogenide frameworks constructed from quaternary metal selenide clusters with two different transition metals

A new vision for Acta Crystallographica Section A

Studies of Materials at the Nanometer Scale Using Coherent X-Ray Diffraction Imaging

Emerging opportunities in structural biology with X-ray free-electron lasers

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