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Near-infrared carbon nanodots for effective identification and inactivation of Gram-positive bacteria

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Nano Research 2022年第3期15卷 1699-1708页

作者： Wen-Bo Zhao Rui-Ting Wang Kai-Kai Liu Meng-Ru Du Yong Wang Yu-Qi Wang Rui Zhou Ya-Chuan Liang Ruo-Nan Ma Lai-Zhi Sui Qing Lou Lin Hou Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China School of Pharmaceutical Sciences Key Laboratory of Targeting Therapy and Diagnosis for Critical DiseasesCollaborative Innovation Center of New Drug Research and Safety EvaluationZhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Ion-beam Bioengineering School of Agricultural ScienceZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

An unacceptable increase in antibacterial resistance has arisen due to the abuse of multiple classes of broad-spectrum antibiotics.Therefore,it is significant to develop new antibacterial agents,especially those that can accurately identify and kill specific bacteria.Herein,we demonstrate a kind of perilla-derived carbon nanodots(CNDs),integrating intrinsic advantages of luminescence and photodynamic,providing the opportunity to accurately identify and kill specific bacteria.The CNDs have an exotic-doped andπ-conjugated core,vitalizing them near-infrared(NIR)absorption and emission properties with photoluminescence quantum yield of 21.1%;hydrophobic chains onto the surface of the CNDs make them to selectively stain Gram-positive bacteria by insertion into their membranes.Due to the strong absorption in NIR region,reactive oxygen species are in situ generated by the CNDs onto bacterial membranes under 660 nm irradiation,and 99.99%inactivation efficiency against Gram-positive bacteria within 5 min can be achieved.In vivo results demonstrate that the CNDs with photodynamic antibacterial property can eliminate the inflammation of the area affected by methicillin-resistant Staphylococcus aureus(MRSA),and enabling the wound to be cured quickly.

关键词： carbon nanodots near-infrared emission specific identification anti-bacteria photodynamic therapy

Multicolor biomass based carbon nanodots for bacterial imaging

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Chinese Chemical Letters 2022年第2期33卷 798-802页

作者： Wenbo Zhao Yong Wang Kaikai Liu Rui Zhou Chongxin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

Biomass-based carbon nanodots(CNDs) are becoming promising fluorescent materials due to their superior optical properties and excellent biocompatibility. However, most fluorescent CNDs are prepared under high temperatures with artificial chemicals as precursors. In this work, multicolor biomass-based CNDs have been prepared by employing natural biomass as precursors through an ultrasonic-assisted method at room temperature. The multicolor biomass-based CNDs can be prepared within 10 min, and cavitation produced by ultrasound in solution contributes to the polymerization of biomolecules into nanodots. The emission of the CNDs covers from blue to red region, with emission peaks centered at 410 nm, 520 nm and 670 nm, and the corresponding photoluminescence quantum yields of the CNDs are 11%, 12% and28%, respectively. Furthermore, bacterial imaging by using the biomass-based CNDs as fluorescent imaging agent has been demonstrated. This work provides a convenient ultrasonic-assisted way for fabrication multicolor and eco-friendly biomass CNDs, demonstrating their application in bacterial imaging.

关键词： carbon nanodots Biomass Fluorescence Ultrasonic methods Bacterial imaging

Improved comprehensive performance of CsPbI_(2) Br perovskite solar cells by modifying the photoactive layers with carbon nanodots

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Journal of Materiomics 2022年第2期8卷 358-365页

作者： Yanzhou Wang Caidong Xie Xincheng Yao Qiulu Chen Weining Liu Yujun Fu Qiming Liu Junshuai Li Yali Li Deyan He Key Laboratory of Special Function Materials&Structure Design of the Ministry of Education And School of Materials&EnergyLanzhou University222 South Tianshui RoadLanzhou730000China

Introducing additives into perovskite layers is an effective method to enhance the power conversion efficiency(PCE)and operation stability of perovskite solar cells(PSCs).Herein,we reported an addition of carbon nanodots(CNDs)into the CsPbI_(2) Br photoactive layer to boost performance of the related PSCs.It is found that the trap density can be notably suppressed,and the crystallinity can be enhanced after introducing CNDs with an optimal quantity.The PSC with 1.0 wt%addition of CNDs delivers a notable improved average PCE of 13.77%(the highest PCE:14.69%)from that of 12.14%for the control device without CND addition.Moreover,the CND-added CsPbI 2 Br PSCs exhibit superior stability,i.e.,~86% retention of the initial PCE after 160 h aging in air with the humidity of 20%-30%,to the control device.

关键词： CsPbI_(2)Br perovskite Solar cells carbon nanodots Power conversion efficiency Stability

carbon nanodots enhanced performance of Cs_(0.15)FA_(0.85)PbI_(3) perovskite solar cells

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Nano Research 2021年第7期14卷 2294-2300页

作者： Yu Gao Wenzhan Xu Fang He Pengbo Nie Qingdan Yang Zhichun Si Hong Meng Guodan Wei Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua UniversityShenzhen 518000China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518000China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510080China Peking University Shenzhen Graduate School Peking UniversityShenzhen 518055China

A high-quality hybrid Cs_(0.15)FA_(0.85)PbI_(3) thin film is deposited through doping of carbon nanodots(CNDs)into perovskite precursor solution.The corresponding inverted planar perovskite solar cells(PSCs)of ITO/PTAA/Cs_(0.15)FA_(0.85)PbI_(3)/PC_(61)BM/BCP/Ag exhibit an improvement in efficiency from 17.36%to 20.06%,which could be attributed to the passivation of the defects at the crystallized perovskite thin film and enhanced perovskite phase uniformity.The results of electron trap density indicate that the addition of CNDs significantly reduces the defects density at the perovskite thin film and the recombination of charge carriers in transport process is minimized.These results demonstrate that low-cost CNDs are effective additives for passivating defects,further reducing charge carrier recombination and improving device efficiency.

关键词： carbon nanodots perovskite solar cells passivation power conversion efficiency

carbon nanodots:a new precursor to achieve reactive nanoporous HOPG surfaces

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Nano Research 2020年第12期13卷 3425-3432页

作者： Cristina Gutiérrez-Sánchez Emiliano Martínez-Periñán Carlos Busó-Rogero Mónica Revenga-Parra Félix Pariente Encarnación Lorenzo Departamento de Química Analítica y Análisis Instrumental Universidad Autónoma de MadridCampus de CantoblancoMadrid28049Spain Institute for Advanced Research in Chemical Sciences(IAdChem) Universidad Autónoma de MadridCampus de CantoblancoMadrid28049Spain IMDEA-Nanoscience.Faraday 9 Campus Cantoblanco-UAMMadrid28049Spain

In the present work we develop an electrochemical assisted method to form nanopores on the surface of highly oriented pyrolytic graphite(HOPG),which was accomplished by a simple electrochemical route and a scalable nanomaterial,carbon nanodots,without applying high voltages,high temperatures or toxic reagents.HOPG electrodes are in a solution of N-enrich carbon nanodots in acidic media and the potential scans applied on HOPG lead to the formation of a spatially inhomogeneous porous surface.The diameter of the resulting nanopores can be tuned by controlling the number of electrochemical reduction cycles.The resulting nanoporous surfaces are characterized by atomic force microscopy,Raman spectroscopy,scanning electrochemical microscopy,electrochemical impedance spectroscopy and electrochemistry.These nanoporous HOPG showed high capacitance.Hence the potential of these surfaces to the development of energy storage devices is demonstrated.

关键词： nanoporous highly oriented pyrolytic graphite(HOPG) carbon nanodots supercapacitor

Self-exothermic reaction driven large-scale synthesis ofphosphorescent carbon nanodots

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Nano Research 2021年第7期14卷 2231-2240页

作者： Shi-Yu Song Lai-Zhi Sui Kai-Kai Liu Qing Cao Wen-Bo Zhao Ya-Chuan Liang Chao-Fan Lv Jin-Hao Zang Yuan Shang Qing Lou Xi-Gui Yang Lin Dong Kai-Jun Yuan Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023China Super Computer Center Smart City InstituteZhengzhou UniversityZhengzhou 450001China

Phosphorescent carbon nanodots(CNDs)have various attractive properties and potential applications,but it remains a formidable challenge to achieve large-scale phosphorescent CNDs limited by current methods.Herein,a large-scale synthesis method for phosphorescent CNDs has been demonstrated via precursors’self-exothermic reaction at room temperature.The as-prepared CNDs show fluorescence and phosphorescence property,which are comparable with that synthesized by solvothermal and microwave method.Experimental and computational studies indicate that exotic atom doped sp^(2) hybridized carbon core works as an emissive center,which facilities the intersystem crossing from singlet state to triplet state.The CNDs show phosphorescence with tunable lifetimes from 193 ms to 1.13 s at different temperatures.The demonstration of large-scale synthesis of phosphorescent CNDs at room temperature opens up a new window for room temperature fabrication phosphorescent CNDs.

关键词： carbon nanodots phosphorescence large scale self-exothermic reaction

Electrochemically driven phenothiazine modification of carbon nanodots

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Nano Research 2018年第12期11卷 6405-6416页

作者： Monica Mediavilla Emiliano Martinez-Perinan Iria Bravo Tania Garcia-Mendiola Monica Revenga-Parra Felix Pariente Encarnacion Lorenzo Departamento de Qufmica Analftica yAndlisis Instrumental UniversidadAutonoma de MadridMadrid28049Spain Instituto Madrileno de Estudios Avanzados (IMDEA)Nanociencia Faraday9Campus UAMCantoblancoMadrid28049Spain Institute for Advanced Research in Chemical Sciences (IAdChem) UniversidadAutonoma de MadridMadrid 28049Spain

carbon nanodots (CNDs) with enriched periphery carboxylic groups were synthesized using the low-cost starting material glucose. The obtained CNDs were assembled onto Au electrodes following one of two strategies: covalent bonding, using cystamine as a cross-linker, or by drop-casting. The immobilized CNDs were covalently modified with the phenothiazine Azure A via electron transfer chemistry; in particular via reactions with aryl diazonium salts. The reaction mechanism for the diazonium functionalization of CNDs was investigated. Spectroelectrochemistry experiments confirmed that electrografting, rather than adsorption, governs the functionalization of CNDs with Azure A. Finally, the application of these CNDs as electrocatalysts for the oxidation of hydrazine was demonstrated.

关键词： carbon nanodots Azure A electrografting phenothiazine

Supra-(carbon nanodots) with a strong visible to near-infrared absorption band and efficient photothermal conversion

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Light(Science & Applications) 2016年第1期5卷 604-611页

作者： Di Li Dong Han Song-Nan Qu Lei Liu Peng-Tao Jing Ding Zhou Wen-Yu Ji Xiao-Yun Wang Tong-Fei Zhang De-Zhen Shen State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China School of Stomatology Jilin UniversityChangchun 130012China

A novel concept and approach to engineering carbon nanodots(CNDs)were explored to overcome the limited light absorption of CNDs in low-energy spectral regions.In this work,we constructed a novel type of supra-CND by the assembly of surface charge-confined CNDs through possible electrostatic interactions and hydrogen bonding.The resulting supra-CNDs are the first to feature a strong,well-defined absorption band in the visible to near-infrared(NIR)range and to exhibit effective NIR photothermal conversion performance with high photothermal conversion efficiency in excess of 50%.

关键词： assembly carbon nanodots NIR photothermal conversion supra-(carbon nanodots) visible to NIR absorption band

Recent Advances in carbon nanodots:Properties and Applications in Cancer Diagnosis and Treatment

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Journal of Analysis and Testing 2019年第1期3卷 37-49页

作者： Xiaofeng Li Lihong Shi Lin Li Chuan Dong Chen-zhong Li Shaomin Shuang School of Chemistry and Chemical Engineering Institute of Environmental ScienceShanxi UniversityTaiyuan 030006ShanxiChina Taiyuan University TaiyuanShanxi 030012China Nanobioengineering/Bioelectronics Laboratory Department of Biomedical EngineeringFlorida International University10555 West Flagler StreetMiamiFL 33174USA

Cancer is a serious threat to human health.Survival rates of cancer patients are highly dependent on the early diagnosis and treatment.carbon nanodots(CDs),a rising star of carbon nanomaterial family,can be developed as a promising terrace for cell labeling,bioimaging,drug delivery,diagnosis,and therapy by virtue of many superior properties including unique photo-luminescence properties,low toxicity,excellent biocompatibility,and easy functionalization.In this mini review,we present the recent progress in fundamental properties of CDs,and highlight their bioapplications in cancer diagnosis and treatment.

关键词： carbon nanodots Photoluminescence Cancer Diagnosis Treatment