Gram-scale synthesis of highly doped chlorine graphene quantum dots: Synthesis and photoluminescence properties

被引：18

作者：

Rady, Hossam Salah ^{[1
]}

Misbah, M. Hamed ^{[1
]}

El-Kemary, Maged ^{[1
]}

机构：

[1] Kafrelsheikh Univ, Inst Nanosci & Nanotechnol, Kafrelsheikh 33511, Egypt

来源：

CARBON | 2023年 / 214卷

关键词：

Graphene oxide; Graphene quantum dots; Time-resolved fluorescence; Band-gap engineering; PHOTOINDUCED ELECTRON-TRANSFER; OPTICAL-PROPERTIES; CARBON DOTS; BAND-GAP; OXIDE; FLUORESCENCE; FABRICATION; C-60/C-70; PERFORMANCE; GRAPHITE;

D O I：

10.1016/j.carbon.2023.118341

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Band-gap engineering of graphene-based nanomaterials has a huge influence on their optical and structural properties. Our contribution reports the successful gram-scale synthesis of highly chlorinated graphene quantum dots (Cl-GQDs) via a two-step preparation method. X-ray photoelectron spectroscopy (XPS) proved the successful doping of chlorine atoms into the as-prepared graphene oxide quantum dots (O-GQDs). Time-resolved fluores-cence revealed a high decrease in the relaxation lifetime from 690 ps for O-GQDs to 5.3-4 ps for Cl-GQDs. Transmission electron microscopy (TEM) confirms that all nanoparticles are on the quantum scale (4-6 nm). The large blueshift in photoluminescence (PL) 150 nm from the original O-GQD (440 & RARR; 290 nm) supports the chlorination effect which enables tuning the band gap of O-GQD.

引用

页数：12

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