Electrochemical Cutting in Weak Aqueous Electrolytes The Strategy for Efficient and Controllable Preparation of Graphene Quantum Dots

Electrochemical Cutting in Weak Aqueous Electrolytes : The Strategy for Efficient and Controllable Preparation of Graphene Quantum Dots

The controllable and efficient electrochemical preparation of highly crystalline graphene quantum dots (GQDs) in an aqueous system is still challenging. Here, we developed a weak electrolyte-based (typically an ammonia solution) electrochemical method to enhance the oxidation and cutting process and...

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Bibliographische Detailangaben
Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 34(2018), 1 vom: 09. Jan., Seite 250-258
1. Verfasser: Huang, Haoguang (VerfasserIn)
Weitere Verfasser: Yang, Siwei, Li, Qingtian, Yang, Yucheng, Wang, Gang, You, Xiaofei, Mao, Baohua, Wang, Huishan, Ma, Yu, He, Peng, Liu, Zhi, Ding, Guqiao, Xie, Xiaoming
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article Research Support, Non-U.S. Gov't
Beschreibung
Zusammenfassung:The controllable and efficient electrochemical preparation of highly crystalline graphene quantum dots (GQDs) in an aqueous system is still challenging. Here, we developed a weak electrolyte-based (typically an ammonia solution) electrochemical method to enhance the oxidation and cutting process and therefore achieve a high yield of GQDs. The yield of GQDs (3-8 nm) is 28%, approximately 28 times higher than the yield of GQDs prepared by other strong electrolytes. The whole preparation process can be accomplished within 2 h because of the effective free radical oxidation process and the suppressed intercalation-induced exfoliation in weakly ionized aqueous electrolytes. The GQDs also showed excellent crystallinity which is obviously better than the crystallinity of GQDs obtained via bottom-up approaches. Moreover, amino-functionalization of GQDs can be realized by manipulating the electrolyte concentration. We further demonstrate that the proposed method can also be expanded to other weak electrolytes (such as HF and H2S) and different anode precursor materials (such as graphene/graphite papers, carbon fibers, and carbon nanotubes)
Beschreibung:Date Completed 11.04.2018
Date Revised 11.04.2018
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1520-5827
DOI:10.1021/acs.langmuir.7b03425