脱氧核酶(DNAzyme)是通过体外筛选技术(systematic evolution of ligands by exponential enrichment,SELEX技术)得到的具有酶活性的单链DNA片段。与天然酶相比,脱氧核酶具有性质稳定、合成和修饰简单以及易于储存等优势。某些脱氧核酶...脱氧核酶(DNAzyme)是通过体外筛选技术(systematic evolution of ligands by exponential enrichment,SELEX技术)得到的具有酶活性的单链DNA片段。与天然酶相比,脱氧核酶具有性质稳定、合成和修饰简单以及易于储存等优势。某些脱氧核酶对金属离子显示了高度的识别特异性,且酶活性与特定金属离子的浓度密切相关。这些特点使其在金属离子检测中的应用备受关注。本文对脱氧核酶在重金属离子传感器设计中的应用进行了总结和评述,重点讨论了荧光传感器和比色传感器的设计。展开更多
Developing fluorescent sensors for small-molecule phosphates offers opportunities in optically detecting biorelevant reactions and events.However,it remains elusive how to identify phosphates from other anions,such as...Developing fluorescent sensors for small-molecule phosphates offers opportunities in optically detecting biorelevant reactions and events.However,it remains elusive how to identify phosphates from other anions,such as carboxylates and sulfates,because current synthetic phosphate receptors lack selectivity.Here we report the construction of a multicolor fluorescent sensor that can identify phosphates from other analogous anions.The key design principle is to take advantage of the highly sensitive conformation-dependent emissive wavelength of diphenyl-9,14-dihydrodibenzo[a,c]phenazine fluorophores to sense the minor structural differences between phosphates and other anions,for example,sulfates and carboxylates.The effect of structural factors such as spacer length and urea versus thiourea has been investigated by comparing the optical properties and binding affinities with the phosphate receptors.This strategy provides a simple and robust fluorescent sensing solution to optically analyze small-molecule phosphates with antiinterference performance.展开更多
Fluorescent carbon dots(CDs)have been identified as potential nanosensors and attracted tremendous research interests in wide areas including anti-counterfeiting,environmental and biological sensing and imaging in con...Fluorescent carbon dots(CDs)have been identified as potential nanosensors and attracted tremendous research interests in wide areas including anti-counterfeiting,environmental and biological sensing and imaging in considering of the attractive optical properties.In this work,we present a CDs based fluorescent sensor from polyvinylpyrrolidone,citric acid,and methionine as precursors by hydrothermal approach.The selective quantifying of Fe^(3+)and ascorbic acid(AA)are based on the fluorescent on-off-on process,in which the fluorescent quenching is induced by the coordination of the Fe^(3+)on the surface of the CDs,while the fluorescence recovery is mainly attributed to redox reaction between Fe^(3+)and AA,breaking the coordination and bringing the fluorescence back.Inspired by the good water solubility and biocompatibility,significant photostability,superior photobleaching resistance as well as high selectivity,sensitivity,and interference immunity,which are constructed mainly from the N,S-doping and methionine surface functionalization,the CDs have not only been employed as fluorescence ink in multiple anticounterfeiting printing and confidential document writing or transmitting,but also been developed as promising fluorescence sensors in solution and solid by CDs doped test strips and hydrogels for effectively monitoring and removing of Fe^(3+)and AA in environmental aqueous solution.The CDs have been also implemented as effective diagnostic candidates for imaging and tracking of Fe^(3+)and AA in living cells,accelerating the understanding of their function and importance in related biological processes for the prevention and treatment specific diseases.展开更多
Heteroatom doped carbon dots(CDs)with distinct merits are of great attractions in various fields such as solar cells,catalysis,trace element detection and photothermal therapy.In this work,we successfully synthesized ...Heteroatom doped carbon dots(CDs)with distinct merits are of great attractions in various fields such as solar cells,catalysis,trace element detection and photothermal therapy.In this work,we successfully synthesized blue-fluorescence and photostability manganese-doped carbon dots(Mn-CDs)with a quantum yield up to 7.5%,which was prepared by a facile one-step hydrothermal method with sodium citrate and manganese chloride.The Mn-CDs is the high mono-dispersity,uniform spherical nanoparticles.The Mn element plays a critical role in achieving a high quantum yield in synthesis of carbon dots,which was confirmed by the structure analysis using XPS and FTIR.Spectroscopic investigations proved that the decent PLQY and luminescence properties of Mn-CDs are due to the heteroatom doped,oxidized carbon-based surface passivation.In addition,the Mn-CDs are demonstrated as promising fluorescent sensors for iron ions with a linear range of 0–500 μmol/L and a detection limit of2.1 nmol/L(turn-off),indicating their great potential as a fluorescent probe for chemical sensing.展开更多
Microbial activity is the cause of a variety of problems in water injection systems, e.g., microbial corrosion, plugging, and biofouling. Efficient monitoring of Saudi Aramco’s vast water injection system requires th...Microbial activity is the cause of a variety of problems in water injection systems, e.g., microbial corrosion, plugging, and biofouling. Efficient monitoring of Saudi Aramco’s vast water injection system requires the development of online and automated technologies for monitoring microbial activities in the system. A previous system review and technology screening has identified five single-analyte strategies [1], which were evaluated in this study with a laboratory-scale setup to determine their applicability for automated determination of microbial activity in the injection water system. Four of the five single-analyte measuring principles tested in the laboratory setup were deemed less suitable for automation and/or reliable for use in the detection of microbial activity in the company injection water system. These four principles were: luminescence assay for adenosine-5’-triphosphate (ATP), detection and electrochemical measurements of H<sub>2</sub>S, determination of pH by electrochemical sensor, and measurement of oxidation-reduction potential (ORP). The strategy of staining cells with fluorescent DNA dyes, followed by quantification of fluorescence signals, was identified to hold, with proper optimization of DNA staining and fluorescence detection, a very promising potential for integration in automated, online sensors for microbial activity in the injection water system.展开更多
MXenes have emerged as versatile 2D materials that are already gaining paramount attention in the areas of energy,catalyst,electromagnetic shielding,and sensors.The unique surface chemistry,graphene-like mo rphology,h...MXenes have emerged as versatile 2D materials that are already gaining paramount attention in the areas of energy,catalyst,electromagnetic shielding,and sensors.The unique surface chemistry,graphene-like mo rphology,high hydrophilicity,metal-like conductivity with redox capability identifies MXenes,as an ideal material for surface-related applications.This short review summarizes the most recent reports that discuss the potential application of MXenes and their hybrids as a transducer material for advanced sensors.Based on the nature of transducing signals,the discussion is categorized into three sections,which include electrochemical(bio)sensors,gas sensors,and finally,electro-chemiluminescence&fluorescent sensors.The review provides a concise summary of all the analytical merits obtained subsequent to the use of MXenes,followed by endeavors that have been made to accentuate the future perspective of MXenes in sensor devices.展开更多
Innovative design of sensing fluorophores possessing superior photophysical properties,porosity,and packing-resistance structures is pivotal for high performance film-based fluorescent sensors.Herein,PDCB,a perylene m...Innovative design of sensing fluorophores possessing superior photophysical properties,porosity,and packing-resistance structures is pivotal for high performance film-based fluorescent sensors.Herein,PDCB,a perylene monoimide(PMI)derivative incorporating large spatial phenyl-carborane was synthesized and found to exhibit unexpected photophysical properties.The structurally bent PDCB exhibits not only PMI-like emission but also a red-shifted emission.In sharp contrast,PMI-CBH,a linear PMI derivative,exhibits only PMI-like emission.Furthermore,upon local excitation,PDCB undergoes a photoinduced electron transfer(PET)between PMI and phenylcarborane,resulting in a charge-transfer state.Two other PMI derivatives,PCB and PDCBP,showed a similar phenomenon.The PET rate is in the order of PCB(48 ps^(-1))>PDCB(163 ps^(-1))>PDCBP(815 ps^(-1))in toluene,which decreases with increasing steric hindrance,inferring structure reorganization prior to the PET process.As expected,a fabricated PDCB-based sensor showed excellent performance in acetone sensing.展开更多
文摘脱氧核酶(DNAzyme)是通过体外筛选技术(systematic evolution of ligands by exponential enrichment,SELEX技术)得到的具有酶活性的单链DNA片段。与天然酶相比,脱氧核酶具有性质稳定、合成和修饰简单以及易于储存等优势。某些脱氧核酶对金属离子显示了高度的识别特异性,且酶活性与特定金属离子的浓度密切相关。这些特点使其在金属离子检测中的应用备受关注。本文对脱氧核酶在重金属离子传感器设计中的应用进行了总结和评述,重点讨论了荧光传感器和比色传感器的设计。
基金supported by the National Natural Science Foundation of China(grant nos.22220102004 and 22025503)Shanghai Municipal Science and Technology Major Project(grant no.2018SHZDZX03)+3 种基金the Innovation Program of Shanghai Municipal Education Commission(grant no.2023ZKZD40)the Fundamental Research Funds for the Central Universities,the Programme of Introducing Talents of Discipline to Universities(grant no.B16017)Science and Technology Commission of Shanghai Municipality(grant no.21JC1401700)the Starry Night Science Fund of Zhejiang University Shanghai Institute for Advanced Study(grant no.SN-ZJUSIAS-006).
文摘Developing fluorescent sensors for small-molecule phosphates offers opportunities in optically detecting biorelevant reactions and events.However,it remains elusive how to identify phosphates from other anions,such as carboxylates and sulfates,because current synthetic phosphate receptors lack selectivity.Here we report the construction of a multicolor fluorescent sensor that can identify phosphates from other analogous anions.The key design principle is to take advantage of the highly sensitive conformation-dependent emissive wavelength of diphenyl-9,14-dihydrodibenzo[a,c]phenazine fluorophores to sense the minor structural differences between phosphates and other anions,for example,sulfates and carboxylates.The effect of structural factors such as spacer length and urea versus thiourea has been investigated by comparing the optical properties and binding affinities with the phosphate receptors.This strategy provides a simple and robust fluorescent sensing solution to optically analyze small-molecule phosphates with antiinterference performance.
基金supported by the National Natural Science Foundation of China(Nos.22171223,22179107,22077099,and 21807087)the Technology Innovation Leading Program of Shaanxi(No.2020TG−031)+2 种基金the Shaanxi Provincial Natural Science Fund Project(No.2018JQ2061)the Xi’an City Science and Technology Project(Nos.2020KJRC011 and 2019218214GXRC018CG019−GXYD18.4)the Outstanding Youth Science Fund of Xi’an University of Science and Technology(No.2018YQ3-14).
文摘Fluorescent carbon dots(CDs)have been identified as potential nanosensors and attracted tremendous research interests in wide areas including anti-counterfeiting,environmental and biological sensing and imaging in considering of the attractive optical properties.In this work,we present a CDs based fluorescent sensor from polyvinylpyrrolidone,citric acid,and methionine as precursors by hydrothermal approach.The selective quantifying of Fe^(3+)and ascorbic acid(AA)are based on the fluorescent on-off-on process,in which the fluorescent quenching is induced by the coordination of the Fe^(3+)on the surface of the CDs,while the fluorescence recovery is mainly attributed to redox reaction between Fe^(3+)and AA,breaking the coordination and bringing the fluorescence back.Inspired by the good water solubility and biocompatibility,significant photostability,superior photobleaching resistance as well as high selectivity,sensitivity,and interference immunity,which are constructed mainly from the N,S-doping and methionine surface functionalization,the CDs have not only been employed as fluorescence ink in multiple anticounterfeiting printing and confidential document writing or transmitting,but also been developed as promising fluorescence sensors in solution and solid by CDs doped test strips and hydrogels for effectively monitoring and removing of Fe^(3+)and AA in environmental aqueous solution.The CDs have been also implemented as effective diagnostic candidates for imaging and tracking of Fe^(3+)and AA in living cells,accelerating the understanding of their function and importance in related biological processes for the prevention and treatment specific diseases.
基金the financial support from the National Natural Science Foundation of China(No.81773642)Hunan Provincial Natural Science Foundation(No.2018JJ2363)+3 种基金Guangdong-Hong Kong Technology Cooperation Fund(No.2017A050506016)the Research Program of Yongchuan Science and Technology Commission(Ycstc,No.2018nb1402)Military Youth Innovation Training Program(No.16QNP145)Translational Medicine Program(No.GHPLA 2016TM-019)for the support
文摘Heteroatom doped carbon dots(CDs)with distinct merits are of great attractions in various fields such as solar cells,catalysis,trace element detection and photothermal therapy.In this work,we successfully synthesized blue-fluorescence and photostability manganese-doped carbon dots(Mn-CDs)with a quantum yield up to 7.5%,which was prepared by a facile one-step hydrothermal method with sodium citrate and manganese chloride.The Mn-CDs is the high mono-dispersity,uniform spherical nanoparticles.The Mn element plays a critical role in achieving a high quantum yield in synthesis of carbon dots,which was confirmed by the structure analysis using XPS and FTIR.Spectroscopic investigations proved that the decent PLQY and luminescence properties of Mn-CDs are due to the heteroatom doped,oxidized carbon-based surface passivation.In addition,the Mn-CDs are demonstrated as promising fluorescent sensors for iron ions with a linear range of 0–500 μmol/L and a detection limit of2.1 nmol/L(turn-off),indicating their great potential as a fluorescent probe for chemical sensing.
文摘Microbial activity is the cause of a variety of problems in water injection systems, e.g., microbial corrosion, plugging, and biofouling. Efficient monitoring of Saudi Aramco’s vast water injection system requires the development of online and automated technologies for monitoring microbial activities in the system. A previous system review and technology screening has identified five single-analyte strategies [1], which were evaluated in this study with a laboratory-scale setup to determine their applicability for automated determination of microbial activity in the injection water system. Four of the five single-analyte measuring principles tested in the laboratory setup were deemed less suitable for automation and/or reliable for use in the detection of microbial activity in the company injection water system. These four principles were: luminescence assay for adenosine-5’-triphosphate (ATP), detection and electrochemical measurements of H<sub>2</sub>S, determination of pH by electrochemical sensor, and measurement of oxidation-reduction potential (ORP). The strategy of staining cells with fluorescent DNA dyes, followed by quantification of fluorescence signals, was identified to hold, with proper optimization of DNA staining and fluorescence detection, a very promising potential for integration in automated, online sensors for microbial activity in the injection water system.
基金financially supported by the National Natural Science Foundation of China(NSFC,Nos.51572011 and 51802012)。
文摘MXenes have emerged as versatile 2D materials that are already gaining paramount attention in the areas of energy,catalyst,electromagnetic shielding,and sensors.The unique surface chemistry,graphene-like mo rphology,high hydrophilicity,metal-like conductivity with redox capability identifies MXenes,as an ideal material for surface-related applications.This short review summarizes the most recent reports that discuss the potential application of MXenes and their hybrids as a transducer material for advanced sensors.Based on the nature of transducing signals,the discussion is categorized into three sections,which include electrochemical(bio)sensors,gas sensors,and finally,electro-chemiluminescence&fluorescent sensors.The review provides a concise summary of all the analytical merits obtained subsequent to the use of MXenes,followed by endeavors that have been made to accentuate the future perspective of MXenes in sensor devices.
基金the Ministry of Science and Technology of China(grant nos.SQ2022YFA1200081 and 2022010133)the National Natural Science Foundation of China(grant nos.21820102005 and 22132002)111 project(grant no.B14041).
文摘Innovative design of sensing fluorophores possessing superior photophysical properties,porosity,and packing-resistance structures is pivotal for high performance film-based fluorescent sensors.Herein,PDCB,a perylene monoimide(PMI)derivative incorporating large spatial phenyl-carborane was synthesized and found to exhibit unexpected photophysical properties.The structurally bent PDCB exhibits not only PMI-like emission but also a red-shifted emission.In sharp contrast,PMI-CBH,a linear PMI derivative,exhibits only PMI-like emission.Furthermore,upon local excitation,PDCB undergoes a photoinduced electron transfer(PET)between PMI and phenylcarborane,resulting in a charge-transfer state.Two other PMI derivatives,PCB and PDCBP,showed a similar phenomenon.The PET rate is in the order of PCB(48 ps^(-1))>PDCB(163 ps^(-1))>PDCBP(815 ps^(-1))in toluene,which decreases with increasing steric hindrance,inferring structure reorganization prior to the PET process.As expected,a fabricated PDCB-based sensor showed excellent performance in acetone sensing.
