The Enhanced Photoluminescence Properties of Carbon Dots Derived from Glucose: The Effect of Natural Oxidation

Author:

Zhang Pei1,Zheng Yibo1,Ren Linjiao1,Li Shaojun1,Feng Ming1,Zhang Qingfang1,Qi Rubin1,Qin Zirui1,Zhang Jitao1,Jiang Liying2

Affiliation:

1. Henan Key Lab of Information-Based Electrical Appliances, College of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China

2. School of Electronics and Information, Academy for Quantum Science and Technology, Zhengzhou University of Light Industry, No. 136 Ke Xue Avenue, Zhengzhou 450002, China

Abstract

The investigation of the fluorescence mechanism of carbon dots (CDs) has attracted significant attention, particularly the role of the oxygen-containing groups. Dual-CDs exhibiting blue and green emissions are synthesized from glucose via a simple ultrasonic treatment, and the oxidation degree of the CDs is softly modified through a slow natural oxidation approach, which is in stark contrast to that aggressively altering CDs’ surface configurations through chemical oxidation methods. It is interesting to find that the intensity of the blue fluorescence gradually increases, eventually becoming the dominant emission after prolonging the oxidation periods, with the quantum yield (QY) of the CDs being enhanced from ~0.61% to ~4.26%. Combining the microstructure characterizations, optical measurements, and ultrafiltration experiments, we hypothesize that the blue emission could be ascribed to the surface states induced by the C–O and C=O groups, while the green luminescence may originate from the deep energy levels associated with the O–C=O groups. The distinct emission states and energy distributions could result in the blue and the green luminescence exhibiting distinct excitation and emission behaviors. Our findings could provide new insights into the fluorescence mechanism of CDs.

Funder

National Natural Science Foundation of China

Joint Fund of the Henan Province Science and Technology R&D Program

Central Plains Science and Technology Innovation Leaders Project

Key scientific research project of Henan University

Henan Province Science and Technology Plan Project

Publisher

MDPI AG

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