Small structures made out of carbons are a useful and versatile tool that can be used across industries, including water and wastewater, gas and oil, and energy storage. In order to create these nanostructures, synthetic and natural polymers have traditionally been used as a starting point to initiate the chemical reaction necessary to create the nanostructured carbons. This is called a precursor. However, both natural and synthetic polymers have limitations. It is difficult to be as precise with natural polymers because of their complexity and synthetic polymers are difficult and expensive to produce.
Recent research demonstrated an alternative to polymer precursors by using heat to transform small organic molecules into organic metal salts and then into porous carbons. The process of heating the molecules to create a new material is called pyrolysis.
The study was published in Nano Research on October 22.
"The direct purpose of using small molecules as precursors is to simplify carbon preparation by avoiding the polymerization process," said Hai-Wei Liang, a professor and researcher at the University of Science and Technology of China in Hefei. "More importantly, this concept of using small molecules can greatly expand the structural diversity of precursors for carbon preparation and thus could pave a pathway to study the relationship between carbon material properties and precursor structures."
Previous research into small organic molecules as an alternative to polymer precursors faced limitations due to their synthesis conditions, which created small molecules that were more volatile. This study builds on previous research that showed that using ionic liquids, which is a salt in a liquid state, could resolve some of these limitations. They took this idea one step further and used organic metal salts, also called ionic solids, instead of ionic liquids, because organic metal salts are both organic and inorganic materials. This combination of organic and inorganic materials helps the organic metal salts form templates for the carbon nanostructures. They also show that a wide range of small organic molecules can be used as precursors, as long as they include acidic groups that can transform into salt.
"The difficulty of using small molecules for carbon preparation mainly comes from their high volatility, which can be easily overcome by the transformation of small molecules into organic metal salts. This is because the original weak intermolecular force holding molecules together is replaced by robust electrostatic force after the salt formation, thus lowering the volatility," said Liang. Another benefit of using this method is the versatility of the organic metal salts. By altering the components of the organic metal salts, the characteristics of the carbon nanostructures can be controlled at a molecular level.
Looking ahead, researchers will continue to explore the different ways this technique can be used. "Next, we will continue to explore the structural relationship between carbon materials and molecular precursors to establish well-defined rules to guide the rational synthesis of carbon materials at the molecular level. Ultimately, we hope to use the advantage of this method in controlling carbon structures and compositions to achieve the tailor-made synthesis of advanced functional carbon materials for targeted applications," said Liang.
Other contributors include Lei Tong and Liangdong Fan of the Department of New Energy Science and Technology at the College of Chemistry and Environmental Engineering at Shenzhen University and Qian-Qian Yang, Shuai Li, Le-Le Zhang, Wei-Jie Zeng, and Yan-Wei Ding of the Hefei National Research Center for Physical Sciences at the Microscale in the Department of Chemistry at the University of Science and Technology of China.
The National Key Research and Development Program of China, the National Natural Science Foundation of China, the Fundamental Research Funds for the Central Universities, the Joint Funds from Hefei National Synchrotron Radiation Laboratory, the National Science Foundation of Guangdong Province, the Research Grant for Scientific Platform and Project of Guangdong Provincial Education Office, the Shenzhen Government's Plan of Science and Technology, and the Collaborative Innovation Program of Hefei Science Center of CAS supported this research.
The paper is also available on SciOpen (https://www.sciopen.com/article/10.1007/s12274-022-4997-8) by Tsinghua University Press.
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About Nano Research
Nano Research is a peer-reviewed, international and interdisciplinary research journal, publishes all aspects of nano science and technology, featured in rapid review and fast publishing, sponsored by Tsinghua University and the Chinese Chemical Society. It offers readers an attractive mix of authoritative and comprehensive reviews and original cutting-edge research papers. After 15 years of development, it has become one of the most influential academic journals in the nano field. In 2022 InCites Journal Citation Reports, Nano Research has an Impact Factor of 10.269 (9.136, 5 years), the total cites reached 29620, ranking first in China's international academic journals, and the number of highly cited papers reached 120, ranked among the top 2.8% of over 9000 academic journals.
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