What are the listed companies with the concept of carbon nanotubes?

Recently, with the support of Beijing Science and Technology Commission, Professor Wei Fei of Tsinghua University successfully prepared a single carbon nanotube with a length of more than half a meter, setting a new world record, which is also the longest among all one-dimensional nanomaterials at present. Related content was recently published online in the internationally renowned journal Nano of American Chemical Society. According to Tsinghua University News Network, "The research group led by distinguished professor Wei Fei, a professor of Tsinghua University Department of Chemical Engineering, director of Beijing Key Laboratory of Green Reaction Engineering and Technology, and the Ministry of Education, used nano-agglomerated bed reactor to prepare carbon nanotubes, and cooperated with Nanfeng Chemical (000737) Group Co., Ltd. to successfully realize the mass production of 15 kg/h carbon nanotubes, setting a new record for the international industrial preparation capacity of multi-walled carbon nanotubes."