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

Slavia Deeksha Dsouza; Marius Buerkle; Paul Brunet; Chiranjeevi Maddi; Dilli babu Padmanaban; Alessio Morelli; Amir Farokh Payam; Paul Maguire; Davide Mariotti; Vladimir Svrcek

doi:10.1016/j.carbon.2021.06.088

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

Slavia Deeksha Dsouza, Marius Buerkle, Paul Brunet, Chiranjeevi Maddi, Dilli babu Padmanaban, Alessio Morelli, Amir Farokh Payam, Paul Maguire, Davide Mariotti, Vladimir Svrcek

Design, Manufacturing And Engineering Management

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Abstract

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.

Original language	English
Pages (from-to)	1-11
Journal	Carbon
Volume	183
Early online date	2 Jul 2021
DOIs	https://doi.org/10.1016/j.carbon.2021.06.088
Publication status	Published - 15 Oct 2021

Funding

The authors thank Ulster University, National Institute of Advanced Industrial Science and Technology (AIST) and Engineering and Physical Sciences Research Council (EPSRC) (EP/M024938/1, EP/K022237/1, EP/R008841/1) for the financial support. S.D.D acknowledges the financial support from Department for Economy NI (PhD Studentship and USI-146). M.B. and V.S acknowledge the support by Kakenhi (20H02579) by the Japanese Society for the Promotion of Science. A.M. acknowledges funding from Invest Northern Ireland (RD0713920) and the European Union's INTERREG VA Programme, managed by the Special EU Programmes Body (SEUPB).

Keywords

Nitrogen doping
Quantum yield
Photoemission
Microplasma
Optical properties

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Cite this

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abstract = "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.",

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AU - Dsouza, Slavia Deeksha

AU - Buerkle, Marius

AU - Brunet, Paul

AU - Maddi, Chiranjeevi

AU - Padmanaban, Dilli babu

AU - Morelli, Alessio

AU - Payam, Amir Farokh

AU - Maguire, Paul

AU - Mariotti, Davide

AU - Svrcek, Vladimir

PY - 2021/10/15

Y1 - 2021/10/15

N2 - 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.

AB - 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.

KW - Nitrogen doping

KW - Quantum yield

KW - Photoemission

KW - Microplasma

KW - Optical properties

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DO - 10.1016/j.carbon.2021.06.088

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JO - Carbon

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ER -

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

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Keywords

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