The simultaneous synthesis of carbon dots and carbon spheres with tunable sizes using a vertical chemical vapour deposition method

IF 0.8 4区化学 Q4 CHEMISTRY, MULTIDISCIPLINARY

South African Journal of Chemistry-Suid-Afrikaanse Tydskrif Vir Chemie Pub Date : 2022-01-01 DOI:10.17159/0379-4350/2022/v76a05

Lerato L. Mokoloko, R. Forbes, N. Coville

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引用次数: 1

Abstract

ABSTRACT Herein we report on the direct synthesis of solid hydrophobic carbon dots (CDs) and simultaneously carbon spheres (CSs), using a vertical chemical vapour deposition (CVD) reactor. The HRTEM data indicated that the CDs and CSs originated from different carbon building blocks indicated that the CDs and CSs originated from different carbon building blocks. The CDs were obtained by reacting acetylene (C2H2) and Ar mixtures at high flow rates (>500 sccm) and high temperatures (800-1000 °C). TEM studies indicated that the CDs produced were graphene-like quantum dots that increased in size from c. 3 nm to 8 nm as the Ar flow rate (constant C2H2 flow rate) was decreased, while small solid CSs (c. 100 nm) were also synthesised in the process. The CSs had a typical spherical layered structure with no graphitic core. A mechanism to rationalise the observation that the CDs and CSs grew simultaneously by different pathways with no formation of intermediate-sized particles is given. Keywords: carbon dots, chemical vapour deposition, nanostructure, spectroscopy

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采用垂直化学气相沉积法同时合成尺寸可调的碳点和碳球

本文报道了利用垂直化学气相沉积(CVD)反应器直接合成固体疏水碳点(CDs)和碳球(CSs)。HRTEM数据表明cd和CSs来源于不同的碳构建块，表明cd和CSs来源于不同的碳构建块。CDs是由乙炔(C2H2)和Ar混合物在高流速(> ~ 500 sccm)和高温(800 ~ 1000℃)下反应得到的。TEM研究表明，随着氩气流量(恒定C2H2流量)的减小，CDs的尺寸从3 nm增加到8 nm，同时还合成了体积较小的固体CSs (c. 100 nm)。CSs具有典型的球形层状结构，无石墨核。给出了一种机制来解释CDs和CSs通过不同的途径同时生长，而没有形成中等大小的颗粒。关键词:碳点，化学气相沉积，纳米结构，光谱学

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来源期刊

South African Journal of Chemistry-Suid-Afrikaanse Tydskrif Vir Chemie 化学-化学综合

CiteScore

3.10

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Original work in all branches of chemistry is published in the South African Journal of Chemistry. Contributions in English may take the form of papers, short communications, or critical reviews.