Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Tracking the atomic pathways by in-situ liquid cell TEM

09.04.2020

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.


(a, e) Time-lapse sequence of TEM images showing the nucleation growth process of single layer Ni(OH)2 in the Pt3Ni-Ni(OH)2 core-shell structure extracted from movie. (b, f) Schematic illustrations of the growth process of Ni(OH)2 single layer in (a, e). The corresponding statistics of the length of growth layer in (a, e) as a function of time (c, g), and statistics of growth rate in (a, e) as a function of time (d, h), respectively.

Credit: ©Science China Press

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.

###

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

Media Contact

Hong-Gang Liao
hgliao@xmu.edu.cn

http://www.scichina.com/ 

Hong-Gang Liao | EurekAlert!
Further information:
http://dx.doi.org/10.1007/s11426-019-9663-8

More articles from Life Sciences:

nachricht Polarization of Br2 molecule in vanadium oxide cluster cavity and new alkane bromination
13.07.2020 | Kanazawa University

nachricht Researchers present concept for a new technique to study superheavy elements
13.07.2020 | Johannes Gutenberg-Universität Mainz

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron cryo-microscopy: Using inexpensive technology to produce high-resolution images

Biochemists at Martin Luther University Halle-Wittenberg (MLU) have used a standard electron cryo-microscope to achieve surprisingly good images that are on par with those taken by far more sophisticated equipment. They have succeeded in determining the structure of ferritin almost at the atomic level. Their results were published in the journal "PLOS ONE".

Electron cryo-microscopy has become increasingly important in recent years, especially in shedding light on protein structures. The developers of the new...

Im Focus: The spin state story: Observation of the quantum spin liquid state in novel material

New insight into the spin behavior in an exotic state of matter puts us closer to next-generation spintronic devices

Aside from the deep understanding of the natural world that quantum physics theory offers, scientists worldwide are working tirelessly to bring forth a...

Im Focus: Excitation of robust materials

Kiel physics team observed extremely fast electronic changes in real time in a special material class

In physics, they are currently the subject of intensive research; in electronics, they could enable completely new functions. So-called topological materials...

Im Focus: Electrons in the fast lane

Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.

Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....

Im Focus: The lightest electromagnetic shielding material in the world

Empa researchers have succeeded in applying aerogels to microelectronics: Aerogels based on cellulose nanofibers can effectively shield electromagnetic radiation over a wide frequency range – and they are unrivalled in terms of weight.

Electric motors and electronic devices generate electromagnetic fields that sometimes have to be shielded in order not to affect neighboring electronic...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Contact Tracing Apps against COVID-19: German National Academy Leopoldina hosts international virtual panel discussion

07.07.2020 | Event News

International conference QuApps shows status quo of quantum technology

02.07.2020 | Event News

Dresden Nexus Conference 2020: Same Time, Virtual Format, Registration Opened

19.05.2020 | Event News

 
Latest News

Black phosphorus-based van der Waals heterostructures for mid-infrared light-emission applications

13.07.2020 | Physics and Astronomy

Polarization of Br2 molecule in vanadium oxide cluster cavity and new alkane bromination

13.07.2020 | Life Sciences

Researchers present concept for a new technique to study superheavy elements

13.07.2020 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>