The importance of surface states in N-doped carbon quantum dots

被引：103

作者：

Dsouza, Slavia Deeksha ^{[1
,2
]}

Buerkle, Marius ^{[1
]}

Brunet, Paul ^{[2
]}

Maddi, Chiranjeevi ^{[2
]}

Padmanaban, Dilli Babu ^{[2
]}

Morelli, Alessio ^{[2
]}

Payam, Amir Farokh ^{[2
]}

Maguire, Paul ^{[2
]}

Mariotti, Davide ^{[2
]}

Svrcek, Vladimir ^{[1
,2
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol AIST Cent 2, Umezono 1-1-1, Tsukuba, Ibaraki 3058568, Japan

[2] Ulster Univ, Nanotechnol & Integrated Bioengn Ctr NIBE, Jordanstown BT37 0QB, Antrim, North Ireland

来源：

CARBON | 2021年 / 183卷 / 183期

基金：

英国工程与自然科学研究理事会;

关键词：

Nitrogen doping; Quantum yield; Photoemission; Microplasma; Optical properties; BLUE-LUMINESCENT; EFFICIENT SYNTHESIS; ABSORPTION-BANDS; GREEN SYNTHESIS; NITROGEN; PHOTOLUMINESCENCE; ORIGIN; NANOPARTICLES; FLUORESCENCE; SULFUR;

D O I：

10.1016/j.carbon.2021.06.088

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：

Nitrogen-doped carbon quantum dots are synthesized by a one-step atmospheric pressure microplasma process. The origin of the observed photoluminescence emission and its relationship with nitrogen doping is studied using a range of optical and chemical measurements along with verification by theoretical calculations. Nitrogen doping into the core and functionalization of surface states with nitrogen and oxygen groups gives rise to a hybrid structure which is responsible for the luminescence with quantum yields up to 33%. Carrier multiplication is observed as a step-like enhancement in the quantum yield. The analysis of visible-light emission suggests that the emission originates for the most part from surface states and not due to recombination within the quantum dot core. The role of surface functional groups is dominant over quantum confinement in determining the optical properties. (C) 2021 The Authors. Published by Elsevier Ltd.

引用

页码：1 / 11

页数：11

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