{"title":"合成参数对碳点光学特性的影响","authors":"Ángela J. García-Salcedo, Luz Ángela Giraldo-Pinto, Deibys Josué Márquez-Castro, Liliana Tirado-Mejía","doi":"10.1016/j.cartre.2024.100403","DOIUrl":null,"url":null,"abstract":"<div><div>Photoluminescent carbon dots were synthesized by hydrothermal treatment from agricultural waste. Considering that the composition of the dots’ surface depends on the precursor source and that this composition influences the optical properties, this study focused on analyzing the effect of synthesis parameters on the formation of functional groups, on the core structure, on the morphology, and their influence on the absorption, excitation, emission, and quantum performance properties. It was obtained that by increasing the synthesis temperature, functional groups C = O, C = N, and C<img>O were formed in the carbon dots obtained from the three precursors, and an additional group C = C in dots obtained from plantain peels, which are the only one that showed a degradation of the cellulose band. The absorption response indicated the formation of graphitic nuclei with oxygenated groups responsible for the red shift of the absorption maximum moving from 266 to 283 nm. The Raman response indicates that there are graphitic domains in the nucleus, where the defects band has a high intensity for the three precursors. The higher quantum yield value presented by the plantain dots is due to the surface, not the graphitic core. The spherical shape and size of around 2 nm were observed by TEM.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000841/pdfft?md5=121ba394fdb51a1b5d1d01e200ec3d8f&pid=1-s2.0-S2667056924000841-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Influence of synthesis parameters on the optical properties of carbon dots\",\"authors\":\"Ángela J. García-Salcedo, Luz Ángela Giraldo-Pinto, Deibys Josué Márquez-Castro, Liliana Tirado-Mejía\",\"doi\":\"10.1016/j.cartre.2024.100403\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Photoluminescent carbon dots were synthesized by hydrothermal treatment from agricultural waste. Considering that the composition of the dots’ surface depends on the precursor source and that this composition influences the optical properties, this study focused on analyzing the effect of synthesis parameters on the formation of functional groups, on the core structure, on the morphology, and their influence on the absorption, excitation, emission, and quantum performance properties. It was obtained that by increasing the synthesis temperature, functional groups C = O, C = N, and C<img>O were formed in the carbon dots obtained from the three precursors, and an additional group C = C in dots obtained from plantain peels, which are the only one that showed a degradation of the cellulose band. The absorption response indicated the formation of graphitic nuclei with oxygenated groups responsible for the red shift of the absorption maximum moving from 266 to 283 nm. The Raman response indicates that there are graphitic domains in the nucleus, where the defects band has a high intensity for the three precursors. The higher quantum yield value presented by the plantain dots is due to the surface, not the graphitic core. The spherical shape and size of around 2 nm were observed by TEM.</div></div>\",\"PeriodicalId\":52629,\"journal\":{\"name\":\"Carbon Trends\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.1000,\"publicationDate\":\"2024-09-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2667056924000841/pdfft?md5=121ba394fdb51a1b5d1d01e200ec3d8f&pid=1-s2.0-S2667056924000841-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Carbon Trends\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2667056924000841\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Trends","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2667056924000841","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
光致发光碳点是利用农业废弃物经水热处理合成的。考虑到光致发光碳点表面的组成取决于前驱体来源,而这种组成会影响其光学性质,本研究重点分析了合成参数对官能团的形成、对核心结构、对形貌的影响,以及它们对吸收、激发、发射和量子性能特性的影响。结果表明,通过提高合成温度,三种前驱体得到的碳点中都形成了官能团 C = O、C = N 和 CO,而从车前草皮中得到的碳点中还多了一个官能团 C = C,这也是唯一出现纤维素带降解的碳点。吸收响应表明,石墨核与含氧基团的形成导致吸收最大值从 266 纳米红移到 283 纳米。拉曼响应表明,核中存在石墨畴,在这三种前驱体中,缺陷带的强度都很高。车前草点的量子产率值较高,这是由于其表面而非石墨核造成的。通过 TEM 观察到,这些点呈球形,大小约为 2 纳米。
Influence of synthesis parameters on the optical properties of carbon dots
Photoluminescent carbon dots were synthesized by hydrothermal treatment from agricultural waste. Considering that the composition of the dots’ surface depends on the precursor source and that this composition influences the optical properties, this study focused on analyzing the effect of synthesis parameters on the formation of functional groups, on the core structure, on the morphology, and their influence on the absorption, excitation, emission, and quantum performance properties. It was obtained that by increasing the synthesis temperature, functional groups C = O, C = N, and CO were formed in the carbon dots obtained from the three precursors, and an additional group C = C in dots obtained from plantain peels, which are the only one that showed a degradation of the cellulose band. The absorption response indicated the formation of graphitic nuclei with oxygenated groups responsible for the red shift of the absorption maximum moving from 266 to 283 nm. The Raman response indicates that there are graphitic domains in the nucleus, where the defects band has a high intensity for the three precursors. The higher quantum yield value presented by the plantain dots is due to the surface, not the graphitic core. The spherical shape and size of around 2 nm were observed by TEM.