{"title":"Bromine-doped carbon dot: concentration-dependent multicolor emission, nanozyme activity, and visible-light-induced photodynamic bacterial inactivation","authors":"Suman Nayak, Maansi Aggarwal, Prolay Das","doi":"10.1007/s42823-024-00796-0","DOIUrl":null,"url":null,"abstract":"<p>Concentration-dependent multicolor emission is an unusual yet appealing photoluminescence property of various carbonaceous nanomaterials with interesting potential applications. While carbon dots (CDs) are no exception, the predictability and tuning of the microenvironment of CD to make it suitable for displaying concentration-dependent multicolor emission is far from adequately understood. Through the novel synthesis of bromine-doped CDs (Br-CDs) via controlled hydrothermal pyrolysis, we demonstrate the capacity of the same Br-CD to emit intense red (650 nm) as well as blue fluorescence (410 nm) including intermittent colors as a function of concentration and excitation wavelength. The concentration-dependent morphological transition of the Br-CDs was ascertained using electron microscopy shedding light on their optical evolution in response to concentration changes. The phenomenon is validated as being driven by unique rearrangement and surface functionality modulation, which is essentially linked to the concentration of CD in an ensemble. Notably, the synthesized Br-CDs displayed excellent enzyme-mimicking abilities where oxidase-like activity was assessed using a tetramethylbenzidine (TMB) substrate under visible light (LED, 23W), and peroxidase-like activity was evaluated with TMB and H<sub>2</sub>O<sub>2</sub> over a wide range of pH and temperature. The visible-light-triggered generation of Reactive Oxygen Species (ROS) by Br-CDs proved to be an effective antibacterial agent demonstrating a significant eradication rate against both Gram-positive and Gram-negative bacteria. A captivating and unusual photophysical phenomenon is exhibited by Br-CD, showcasing their versatile applications in nanozymes and antibacterial interventions where emission color directly links to the activity eliminating the necessity of multiple titrations to determine concentration/units/dosage.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\n","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Letters","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s42823-024-00796-0","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Concentration-dependent multicolor emission is an unusual yet appealing photoluminescence property of various carbonaceous nanomaterials with interesting potential applications. While carbon dots (CDs) are no exception, the predictability and tuning of the microenvironment of CD to make it suitable for displaying concentration-dependent multicolor emission is far from adequately understood. Through the novel synthesis of bromine-doped CDs (Br-CDs) via controlled hydrothermal pyrolysis, we demonstrate the capacity of the same Br-CD to emit intense red (650 nm) as well as blue fluorescence (410 nm) including intermittent colors as a function of concentration and excitation wavelength. The concentration-dependent morphological transition of the Br-CDs was ascertained using electron microscopy shedding light on their optical evolution in response to concentration changes. The phenomenon is validated as being driven by unique rearrangement and surface functionality modulation, which is essentially linked to the concentration of CD in an ensemble. Notably, the synthesized Br-CDs displayed excellent enzyme-mimicking abilities where oxidase-like activity was assessed using a tetramethylbenzidine (TMB) substrate under visible light (LED, 23W), and peroxidase-like activity was evaluated with TMB and H2O2 over a wide range of pH and temperature. The visible-light-triggered generation of Reactive Oxygen Species (ROS) by Br-CDs proved to be an effective antibacterial agent demonstrating a significant eradication rate against both Gram-positive and Gram-negative bacteria. A captivating and unusual photophysical phenomenon is exhibited by Br-CD, showcasing their versatile applications in nanozymes and antibacterial interventions where emission color directly links to the activity eliminating the necessity of multiple titrations to determine concentration/units/dosage.
期刊介绍：
Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
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