In this work, we present a facile and environmentally friendly synthesis of CQDs based on plasma - liquid interaction method. This is a single-step method and does not use toxic chemicals. The size distribution of obtained CQDs is rather uniform at approximately 3 nm. The emission peak of CQDs shifts from 427 nm to 523 nm as the excitation wavelength is varied from 340 nm to 460 nm. The non-equilibrium reactive chemistry of plasma liquid interaction is responsible for acceleration of the CQDs formation process. | Communications in Physics, Vol. 27, No. 4 (2017), pp. 311-316 DOI: FACILE SYNTHESIS OF CARBON QUANTUM DOTS BY PLASMA-LIQUID INTERACTION METHOD DO HOANG TUNG1,† , TRAN THI THUONG1 , NGUYEN DINH CONG1 , NGUYEN THANH LIEM1 , NGUYEN VAN KHA1 , LE HONG MANH1 , PHAM HONG MINH1 , NGUYEN THI THU THUY2 , NGUYEN MINH HOA3 AND NGUYEN VAN PHU4 1 Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam 2 University of Fire Fighting and Prevention, Hanoi, Vietnam 3 Hue College of Medicine and Pharmacy, Hue, Vietnam 4 Vinh University, Vinh City, Nghe An Province, Vietnam † E-mail: dhtung@ Received 23 September 2017 Accepted for publication 26 November 2017 Published 22 December 2017 Abstract. Carbon quantum dots (CQDs) are a novel type of fluorescent nano-materials with various unique properties. They are recently attracting enormous interest due to their superiority in water solubility, chemical inertness, low toxicity, ease of functionalization as well as resistance to photo-bleaching and potential applications in biomedical indication, photo-catalysis, energy conversion, optoelectronics, and sensing. In this work, we present a facile and environmentally friendly synthesis of CQDs based on plasma - liquid interaction method. This is a single-step method and does not use toxic chemicals. The size distribution of obtained CQDs is rather uniform at approximately 3 nm. The emission peak of CQDs shifts from 427 nm to 523 nm as the excitation wavelength is varied from 340 nm to 460 nm. The non-equilibrium reactive chemistry of plasma liquid interaction is responsible for acceleration of the CQDs formation process. Keywords: carbon quantum dot, plasma device, nano-materials synthesis. Classification numbers: ; ; ; . c 2017 Vietnam Academy of Science and Technology 312 FACILE SYNTHESIS OF CARBON QUANTUM DOTS BY PLASMA - LIQUID INTERACTION METHOD I. INTRODUCTION Carbon quantum dots .
