Carbon dots(CDs)with aggregation-induced emission(AIE)have sparked significant interest in multidimensional anti-counterfeiting due to their exceptional fluorescence properties.However,the preparation of AIE CDs with ...Carbon dots(CDs)with aggregation-induced emission(AIE)have sparked significant interest in multidimensional anti-counterfeiting due to their exceptional fluorescence properties.However,the preparation of AIE CDs with multicolor solid-state fluorescence remains a formidable challenge due to its complicated construction.In the present work,a novel class of multicolor AIE CDs(M-CDs)were fabricated using selected precursor(salicylic acid,thiosalicylic acid,and 2,2'-dithiodibenzoic acid),with an eco-friendly,low-cost one-pot solvothermal method.In the dilute organic solution,M-CDs manifested blue emission,but upon aggregation in the presence of water,the red,yellow,green,and blue emissions were displayed due to the AIE effect.Structural analysis,coupled with theoretical calculations,revealed that the increase in the size of sp2 domains would lower the Eg and cause a red-shift emission wavelength.Significantly,the continuous emission of M-CDs from blue to red can be utilized as ink for multimode printing,enabling the creation of a variety of school badges and quick response codes.These findings hold promising implications for multi-information encryption applications.展开更多
The successful synthesis of the pentazolate anion(cyclo-N-5)has been a great breakthrough in the field of energetic materials.However,the detection methods for these energetic materials based on the pentazolate anion ...The successful synthesis of the pentazolate anion(cyclo-N-5)has been a great breakthrough in the field of energetic materials.However,the detection methods for these energetic materials based on the pentazolate anion are quite rare.Herein,two fluorescent probes for cyclo-N-5anion were designed.Sensor 1(TPE2N)was synthesized with a tetraphenylethylene functionalized by two cationic groups which can generate strong electrostatic interactions with pentazolate anion and result in specific fluorescent changes.Sensor 2 was designed based on sensor 1 and supramolecular cucurbit[7]uril(CB[7]).The unique structural features of CB[7]provide sites for the interaction between the cations and N-5anion in its cavity,which would generate a platform for the detection and enhance the recognition performance.Isothermal titration calorimetry(ITC)experiment and fluorescence titration experiment indicate the binding molar ratio between sensor 1 with CB[7]is 1:2.Both sensors display typical aggregation-induced emission(AIE)features and good water-solubility.The sensors demonstrate excellent sensitivity to pentazole hydrazine salt with high enhancement constant(sensor 1:1.34×10^(6);sensor 2:3.78×10^(6))and low limit of detection(LOD:sensor 1=4.33μM;sensor 2=1.54μM).The formation of an AIE-based supramolecular sensor effectively improves the sensitivity to N-5anion.In addition,the probes also have good selectivity of N-5anion salts.The research would shed some light on the design of novel fluorescent sensors to detect pentazolate-based molecules and provides an example of supramolecular chemistry combined with fluorescent probes.展开更多
Natural resources are practically infinitely abundant in nature,which stimulates scientists to create new materials with inventive uses and minimal environmental impact.Due to the various benefits of natural carbon do...Natural resources are practically infinitely abundant in nature,which stimulates scientists to create new materials with inventive uses and minimal environmental impact.Due to the various benefits of natural carbon dots(NCDs)from them has received a lot of attention recently.Natural products-derived carbon dots have recently emerged as a highly promising class of nanomaterials,showcasing exceptional properties and eco-friendly nature,which make them appealing for diverse applications in various fields such as biomedical,environmental sensing and monitoring,energy storage and conversion,optoelectronics and photonics,agriculture,quantum computing,nanomedicine and cancer therapy.Characterization techniques such as Photoinduced electron transfer,Aggregation-Induced-Emission(AIE),Absorbance,Fluorescence in UV-Vis and NIR Regions play crucial roles in understanding the structural and optical properties of Carbon dots(CDs).The exceptional photoluminescence properties exhibited by CDs derived from natural products have paved the way for applications in tissue engineering,cancer treatment,bioimaging,sensing,drug delivery,photocatalysis,and promising remarkable advancements in these fields.In this review,we summarized the various synthesis methods,physical and optical properties,applications,challenges,future prospects of natural products-derived carbon dots etc.In this expanding sector,the difficulties and prospects for NCD-based materials research will also be explored.展开更多
基金the National Natural Science Foundation of China(No.21807085)the Natural Science Foundation Research Project of Shaanxi Province(No.2023-JCYB-087)+2 种基金the Technology Innovation Leading Program of Shaanxi(No.2020QFY07-05)the Innovation Capability Support Program of Shaanxi(No.2022KJXX-88)the fund of Education Department of Shaanxi Province(Program No.Z20230071).
文摘Carbon dots(CDs)with aggregation-induced emission(AIE)have sparked significant interest in multidimensional anti-counterfeiting due to their exceptional fluorescence properties.However,the preparation of AIE CDs with multicolor solid-state fluorescence remains a formidable challenge due to its complicated construction.In the present work,a novel class of multicolor AIE CDs(M-CDs)were fabricated using selected precursor(salicylic acid,thiosalicylic acid,and 2,2'-dithiodibenzoic acid),with an eco-friendly,low-cost one-pot solvothermal method.In the dilute organic solution,M-CDs manifested blue emission,but upon aggregation in the presence of water,the red,yellow,green,and blue emissions were displayed due to the AIE effect.Structural analysis,coupled with theoretical calculations,revealed that the increase in the size of sp2 domains would lower the Eg and cause a red-shift emission wavelength.Significantly,the continuous emission of M-CDs from blue to red can be utilized as ink for multimode printing,enabling the creation of a variety of school badges and quick response codes.These findings hold promising implications for multi-information encryption applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.22175093 and 22007047)the Natural Science Foundation of Jiangsu Province(Grant No.BK20200474)the China Postdoctoral Science Foundation(Grant No.2022M721615)。
文摘The successful synthesis of the pentazolate anion(cyclo-N-5)has been a great breakthrough in the field of energetic materials.However,the detection methods for these energetic materials based on the pentazolate anion are quite rare.Herein,two fluorescent probes for cyclo-N-5anion were designed.Sensor 1(TPE2N)was synthesized with a tetraphenylethylene functionalized by two cationic groups which can generate strong electrostatic interactions with pentazolate anion and result in specific fluorescent changes.Sensor 2 was designed based on sensor 1 and supramolecular cucurbit[7]uril(CB[7]).The unique structural features of CB[7]provide sites for the interaction between the cations and N-5anion in its cavity,which would generate a platform for the detection and enhance the recognition performance.Isothermal titration calorimetry(ITC)experiment and fluorescence titration experiment indicate the binding molar ratio between sensor 1 with CB[7]is 1:2.Both sensors display typical aggregation-induced emission(AIE)features and good water-solubility.The sensors demonstrate excellent sensitivity to pentazole hydrazine salt with high enhancement constant(sensor 1:1.34×10^(6);sensor 2:3.78×10^(6))and low limit of detection(LOD:sensor 1=4.33μM;sensor 2=1.54μM).The formation of an AIE-based supramolecular sensor effectively improves the sensitivity to N-5anion.In addition,the probes also have good selectivity of N-5anion salts.The research would shed some light on the design of novel fluorescent sensors to detect pentazolate-based molecules and provides an example of supramolecular chemistry combined with fluorescent probes.
文摘Natural resources are practically infinitely abundant in nature,which stimulates scientists to create new materials with inventive uses and minimal environmental impact.Due to the various benefits of natural carbon dots(NCDs)from them has received a lot of attention recently.Natural products-derived carbon dots have recently emerged as a highly promising class of nanomaterials,showcasing exceptional properties and eco-friendly nature,which make them appealing for diverse applications in various fields such as biomedical,environmental sensing and monitoring,energy storage and conversion,optoelectronics and photonics,agriculture,quantum computing,nanomedicine and cancer therapy.Characterization techniques such as Photoinduced electron transfer,Aggregation-Induced-Emission(AIE),Absorbance,Fluorescence in UV-Vis and NIR Regions play crucial roles in understanding the structural and optical properties of Carbon dots(CDs).The exceptional photoluminescence properties exhibited by CDs derived from natural products have paved the way for applications in tissue engineering,cancer treatment,bioimaging,sensing,drug delivery,photocatalysis,and promising remarkable advancements in these fields.In this review,we summarized the various synthesis methods,physical and optical properties,applications,challenges,future prospects of natural products-derived carbon dots etc.In this expanding sector,the difficulties and prospects for NCD-based materials research will also be explored.
