Structure-Controlled Growth of Single-Walled Carbon Nanotubes - Yan Li

iCANX Talks: https://talks.ican-x.com/index

Structure-Controlled Growth of Single-Walled Carbon Nanotubes
Professor Yan Li
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
Group homepage: http://nmns.pku.edu.cn/
ABSTRACT:

Single-walled carbon nanotubes (SWNTs) presents unique structure-dependent properties. Therefore, the structure(or chirality)-controlled preparation of SWNTs is a crucial issue for their advanced applications and has been a great challenge since 1990s. We developed a strategy to synthesize SWNTs with a specific chirality by using intermetallic compound W6Co7 nanocrystals as catalysts. Attributed to the collaboration of structural template effect of the catalyst and the optimized kinetic growth conditions, we were able to relealize the chirality-specified growth of SWNTs of different chiralities. The mechanism of the slective growth was further verified by in situ studies. Tracking Co7W6 nanocrystals by environmental aberration-corrected transmission electron microscope in combination with in situ synchrotron X-ray absorption spectroscopy, we directly present the structural and chemical stability of the Co7W6 nanocrystals in methane, carbon monoxide, and hydrogen at the temperature of 700–1100 C. We also observed the in situ growth of SWNTs. It is obvious that the structure of Co7W6 nanocrystals maintain their atomic structure during the growth. These observations confirmed that the catalysts act as the structural templates for SWNT growth.
BIOGRAPHY:

Prof. Yan Li joined the faculty of Chemistry, Peking University in 1995 and has been the full professor of chemistry at Peking University since 2002. She was also appointed as visiting associate professor in Duke University from November 1999 to May 2001 and distinguished visiting professor in The University of Tokyo from August 2016 to March 2019. Her research is focused on carbon nanomaterials, especially the preparation, modification, characterization and application of carbon nanotubes.
Yan Li has received many awards and honors, such as The National Science Fund for Distinguished Young Scholars (2011), Chang Jiang Scholar by Chinese Ministry of Education (2013), Chemical Innovation Award Distinguished Scientist by Chinese Chemical Society (2018), Outstanding Researcher by China Association for Science and Technology (2015), first class prize of Natural Science Award of Chinese Ministry of Education (2017), first class prize of CAIA (2017), fellow of Royal Society of Chemistry (2014), fellow of School of Engineering at The University of Tokyo (2019), etc. Currently, she is serving as the associated editor of ACS Nano. She is also on the editorial or advisory board of several journals including Nano Research, Chemical Society Reviews, and Materials Horizons. She is also in the committees of several international academic organizations.

Видео Structure-Controlled Growth of Single-Walled Carbon Nanotubes - Yan Li канала iCANX Talks