Direct photodissociation of toluene molecules to photoluminescent carbon dots under pulsed laser irradiation

被引：27

作者：

Zhu, Zhifeng ^{[1
,2
]}

Wang, Shengda ^{[1
]}

Chang, Yajing ^{[1
]}

Yu, Dabin ^{[2
]}

Jiang, Yang ^{[1
,2
]}

机构：

[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China

[2] Inst Elect Engn, State Key Lab Pulsed Power Laser Technol, Hefei 230037, Anhui, Peoples R China

来源：

CARBON | 2016年 / 105卷

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

GRAPHENE QUANTUM DOTS; ONE-STEP SYNTHESIS; FACILE SYNTHESIS; NANOPARTICLES; ABLATION; SPECTROSCOPY; NITROGEN; DIAMOND; SULFUR; LABEL;

D O I：

10.1016/j.carbon.2016.04.047

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：

Herein, we report a facile method of direct photodissociation of toluene molecules to photoluminescent carbon dots (CDs) under pulsed laser irradiation in the absence of surfactants or catalysts. The as-synthesized CDs with diameters 1.3-4.0 nm present regular emission peaks and the crystallographic structure of these species has been identified as graphite 2H from the analysis of high resolution transmission electron microscope (HRTEM) images, X-ray photoelectron spectroscopy (XPS) and Raman spectrum. In addition, First-Principle calculations were performed to discuss the photon-induced excitation in the photodissociation process. The results demonstrate that electrons can be transited from Highest Occupied Molecular Orbital (HOMO) to Lowest Unoccupied Molecular Orbital (LUMO) in toluene molecule by 248 nm single photon excitation process and the Stark effect plays a crucial role in the photodissociation process. These CDs exhibit excellent stable emission due to the stability of crystal structure, which could be considered for promising luminescent applications. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：416 / 423

页数：8

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