ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,525, issued on May 27, was assigned to Xi'an Jiaotong University (Xi'an, China).

"Method for preparing fluorescent carbon quantum dots by using gas-liquid two-phase plasma" was invented by Yuan Li (Xi'an, China), Jing Gao (Xi'an, China) and Guanjun Zhang (Xi'an, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for preparing fluorescent carbon quantum dots by using gas-liquid two-phase plasma is provided, which relates to the field of fluorescent carbon quantum technology. On the basis of liquid phase plasma, an inert gas is introduced to generate plasma by a gas-liquid two-phase discharge method. The introduction of inert gas facilitate...