Nav: Home

Tracking the atomic pathways by in-situ liquid cell TEM

April 08, 2020

Recently, platinum-containing core-shell structures with tunable magnetic and catalytic properties have attracted intensive attentions and offered a wide range of applications. To date, their synthetic routes are mostly based on galvanic replacement, co-reduction, thermal decomposition and seed-mediated method. But the detailed formation mechanisms of core-shell structures in solution, especially, at gas-liquid interface are still not completely clear, which is mostly achieved based on post reaction studies or ex situ characterizations. In this regard, it is worthwhile but still very challenging to directly visualize the complicate and delicate dynamic processes.

Technical advantages of in-situ liquid electron microscopy (TEM) allow us to monitor the growth trajectory of pure metal nanoparticles in liquid media, including nucleation growth, nanorod self-assembly, and electrochemical deposition. Compared with pure metal nanocrystals, the growth pathway for alloy and its oxide core-shell structures is more complicated. It is noteworthy that little is known about the atomic growth pathway of Pt based-oxide core-shell structures and structural stability in solution, especially, at the gas-liquid interface. Due to the lack of direct observation method with high spatial resolution, some intermediate states may be easily missed.

Herein, Honggang Liao's group first observed the atomic growth way of Pt3Ni-Ni(OH)2 core-shell structure at gas-liquid interface using in-situ liquid cell TEM. Experiment results revealed the underlying growth and transformation mechanisms of the Pt3Ni-Ni(OH)2 core-shell structure by systematically changing the Ni:Pt ratio in the precursor solution and tuning electron beam dose rate. Key questions regarding the growth mechanism for single- and multi-layer Ni(OH)2 flakes were addressed. It is anticipated that this work could provide atomic insights on the rational design of metal-2D core-shell structures for potential wide range applications.
-end-
This work was supported by the National Key Research and Development Program of China (2017YFA0206500) and the National Natural Science Foundation of China (21673198, 21373008, 21621091).

See the article: Zhang J, Li G, Liao HG, Sun SG. Tracking the atomic pathways of Pt3Ni-Ni(OH)2 core-shell structures at the gas-liquid interface by in-situ liquid cell TEM. Sci China Chem, 2020, 63, 513-518. https://doi.org/10.1007/s11426-019-9663-8

Science China Press

Related Alloy Articles:

Counterintuitive phase behavior observed in isotopic hydrogen (H2-HD-D2) alloy
A joint team from the Institute of Solid State Physics of the Hefei Institutes of Physical Science, collaborating with researchers from the Center for High Pressure Science & Technology Advanced Research and University of Edinburgh, has reported a new discovery in which they found counterintuitive effects of isotopic doping on the phase diagram of H2-HD-D2 molecular alloy.
Instant hydrogen production for powering fuel cells
Researchers from the Chinese Academy of Sciences, Beijing and Tsinghua University, Beijing investigate real-time, on-demand hydrogen generation for use in fuel cells, which are a quiet and clean form of energy.
Why are alloy metal nanoparticles better than monometallic ones for CNT growth?
Revealing a long-term mystery of why certain nanoparticles are more efficient in incorporating carbon atoms and achieving a faster carbon nanotube growth.
An alloy that retains its memory at high temperatures
Even after the hundredth time the material returns to its original shape when heated.
Researchers strengthen weakest link in manufacturing strong materials
Industrial and automotive machinery, such as automotive engine parts, contain materials that are, heat-, wear-, and corrosion-resistant.
Simulation technique can predict microstructures of alloy materials used in jet engines -- before they are made
Japanese researchers were able to rapidly and accurately predict the microstructure of Nickel -- Aluminum (Ni-Al) alloys that are commonly used in the design of jet engine turbine parts.
Physicists from IKBFU create metallic alloy for magnetic refrigerator
Physicists of the Laboratory of Novel Magnetic Materials of the Immanuel Kant Baltic Federal University study magnetic materials and magnetostructural phase transition in order to create a new magnetic cooling technology.
A new rare metals alloy can change shape in the magnetic field
Scientists developed multifunctional metal alloys that emit and absorb heat at the same time and change their size and volume under the influence of a magnetic field.
New reactor-liner alloy material offers strength, resilience
A new tungsten-based alloy developed at Los Alamos National Laboratory can withstand unprecedented amounts of radiation without damage.
Nanotechnology enables engineers to weld previously un-weldable aluminum alloy
Engineers at the UCLA Samueli School of Engineering are using nanotechnology to weld the alloy, known as AA 7075, which has been almost impossible to weld together using the technique commonly used to assemble body panels or engine parts.
More Alloy News and Alloy Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Making Amends
What makes a true apology? What does it mean to make amends for past mistakes? This hour, TED speakers explore how repairing the wrongs of the past is the first step toward healing for the future. Guests include historian and preservationist Brent Leggs, law professor Martha Minow, librarian Dawn Wacek, and playwright V (formerly Eve Ensler).
Now Playing: Science for the People

#566 Is Your Gut Leaking?
This week we're busting the human gut wide open with Dr. Alessio Fasano from the Center for Celiac Research and Treatment at Massachusetts General Hospital. Join host Anika Hazra for our discussion separating fact from fiction on the controversial topic of leaky gut syndrome. We cover everything from what causes a leaky gut to interpreting the results of a gut microbiome test! Related links: Center for Celiac Research and Treatment website and their YouTube channel
Now Playing: Radiolab

The Flag and the Fury
How do you actually make change in the world? For 126 years, Mississippi has had the Confederate battle flag on their state flag, and they were the last state in the nation where that emblem remained "officially" flying.  A few days ago, that flag came down. A few days before that, it coming down would have seemed impossible. We dive into the story behind this de-flagging: a journey involving a clash of histories, designs, families, and even cheerleading. This show is a collaboration with OSM Audio. Kiese Laymon's memoir Heavy is here. And the Hospitality Flag webpage is here.