Nitrogen-doped carbon quantum dots(N-CQDs)are nanocomposites that can be synthesized by the hydrothermal method.In this work,N-CQDs with the size of 3.2±1.7 nm was prepared from 1 g citric acid and 2 g urea precu...Nitrogen-doped carbon quantum dots(N-CQDs)are nanocomposites that can be synthesized by the hydrothermal method.In this work,N-CQDs with the size of 3.2±1.7 nm was prepared from 1 g citric acid and 2 g urea precursor in 10 mL water.Electrochemiluminescence(ECL)of the prepared N-CQDs with K2S2O8 as a coreactant was found to reach a high ECL efficiency up to 109%relative to that of the Ru(bpy)_(3)^(2+)/K_(2)S_(2)O_(8),coreactant system,revealing their great potential for electroanalysis.It is probably because that N elements were doped well in this N-CQDs and increased presence of surface states per mass of N-CQDs.From the spooling ECL spectroscopy,it can be found that the ECL spectra exhibited both a red shift compared with their photoluminescence(PL)spectrum and a wavelength shift during the potentiodynamic scan in the ECL evolution and devolution processes,due to various emissive excited states of N-CQDs leading to higher ECL efficiency.This work gives an insight into development of high ECL efficiency N-CQDs for bioanalytical and light emitting applications.展开更多
The electrochemiluminescence(ECL)properties of many carbon materials have been reported with glassy carbon(GC),Pt,Au or indium tin oxide(ITO)as the working electrode(WE).As one type of carbon materials,GC itself can g...The electrochemiluminescence(ECL)properties of many carbon materials have been reported with glassy carbon(GC),Pt,Au or indium tin oxide(ITO)as the working electrode(WE).As one type of carbon materials,GC itself can generate ECL signal.Some research groups have already noticed the ECL signal from GC WE and reported the results of GC WE with respect to their luminophores.However,comprehensive analyses of ECL properties of GC WE are rare.Herein,the ECL properties of GC WE in organic electrolyte with benzoyl peroxide as the coreactant are reported.Our results are of great importance to distinguish the true ECL data of luminophores from that of GC.展开更多
Electrochemiluminescence(ECL)has attracted considerable interest for many applications such as microscopy,(bio)analysis,light-emitting materials or devices.In this work,we report the fabrication and characterization o...Electrochemiluminescence(ECL)has attracted considerable interest for many applications such as microscopy,(bio)analysis,light-emitting materials or devices.In this work,we report the fabrication and characterization of ECL-active hydrogel films with tunable thickness.The redox films were prepared by electrochemically-assisted radical polymerization by potential cycling of a PBS solution containing the monomer N-isopropylacrylamide,the initiator potassium persulfate,the cross-linker N,N′-methylenebis(acrylamide)and the Ru(bpy)3 monomer.The deposits were easily prepared in a rapid and well-controlled one-step procedure.The resulting homogeneous films are composed of a poly(N-isopropylacrylamide)(pNIPAM)matrix,which incorporates covalently[Ru(bpy)_(3)]^(2+)centers.The thickness and the number of ECL-active sites is tuned by control-ling the number of voltammetric scans.The deposited pNIPAM films are permeable to water-soluble chemicals such as the coreactant tri-n-propylamine(TPrA).The voltammetric characterization shows a continuous increase of the number of redox-active sites.Results indicate that ECL signals are proportional to the number of electrodeposited[Ru(bpy)_(3)]^(2+)centers.Such approach combining ECL and stimuli-responsive hydrogels open exciting prospects for developing new(bio)sensing materials.展开更多
Despite the various synthesis approachs to obtain luminous carbon dots(CDs),it is still quite challenging to construct the efficient electrochemiluminescence(ECL)owing to their low ECL reactivity and easy agglomeratio...Despite the various synthesis approachs to obtain luminous carbon dots(CDs),it is still quite challenging to construct the efficient electrochemiluminescence(ECL)owing to their low ECL reactivity and easy agglomeration.Herein,an efficient and concise ECL system was skillfully constructed by taking advantage of the nitrogen and sulfur co-doped CDs(N,S-CDs)with surfaces rich in hydrazide groups as luminophors to emit intense ECL,and metal-organic framework(MOF)as the matrix to confine CDs in its nanospace.Surprisingly,the proposed CDs assembled MOF(CDs/ZIF-8)enhanced anodic ECL signal up to 250%of pure CDs under the exogenous coreactant-free condition.As a proof of concept,the highly sensitive detection of uric acid(UA)was realized by the constructed ECL platform with a low detection limit of 3.52 nmol/L ranging from 10 nmol/L to 50μmol/L.This work expanded ideas for the application of pore confinement effect,and provided references for the detection of disease biomarkers of gout and hyperuricemia.展开更多
Electrochemiluminescent(ECL)technique has drawn increasing attention in a myriad of applications ranging from clinic diagnosis to the environment and food monitoring.The advantages of ECL sensors include high sensitiv...Electrochemiluminescent(ECL)technique has drawn increasing attention in a myriad of applications ranging from clinic diagnosis to the environment and food monitoring.The advantages of ECL sensors include high sensitivity,negligible background,and excellent controllability with respect to its counterparts.The past 2 years have witnessed an impetus in the rise of a batch of luminophores and coreactants as advanced materials to boost the ECL efficiencies.In the review,we summarize the latest progress of new ECL biosensing systems,in particular of emerging luminophores,coreactants,and the involved mechanisms.Possible limitations and exciting future developments of the ECL biosensing are also complementarily discussed.It is highly envisioned that the review article would inspire more intriguing advances both in the fundamental research and more demanding practical applications of ECL for prospective biosensing.展开更多
Electrochemiluminescence(ECL)-based imaging analysis is a dominant method to inspect the electrode composition,to study electrochemical reaction kinetics at a microscopic level,and also a rapid emerging technology in ...Electrochemiluminescence(ECL)-based imaging analysis is a dominant method to inspect the electrode composition,to study electrochemical reaction kinetics at a microscopic level,and also a rapid emerging technology in bioanalysis with high spatiotemporal resolutions,high-throughput and visualization characteristics.In comparison with other imaging microscopes,an optical excitation is not involved in imaging,thus the approach is free from background noise resulting in a low detec-tion limit.In this review work,the principle of ECL,its unique natures compared to other luminescence techniques were briefed at first.Then after,the progress and basic principles of ECL imaging were summarized.Furthermore,recent and representative advances of ECL imaging for visualizing and sensing applications were reviewed.Finally,the perspectives in ECL imaging for further perspective were discussed.展开更多
Soy flour(SF),soy protein and soy protein isolates(SPI)have been the focus of increasing research on their application as new materials for a variety of applications,mainly for wood adhesives and other resins.Tannins ...Soy flour(SF),soy protein and soy protein isolates(SPI)have been the focus of increasing research on their application as new materials for a variety of applications,mainly for wood adhesives and other resins.Tannins too have been the focus of increasing research for similar applications.While both materials are classed as non-toxic and have achieved interesting results the majority of the numerous and rather inventive approaches have still relied on some sort of hardeners or cross-linkers to bring either of them or even their combination to achieve acceptable results.The paper after a presentation of the two materials and their characteristics concentrates on the formation of gels,gelling and even hardening in the case of soy-tannin combined resins.The chapter than finishes with details of the formation of resins giving suitable wood adhesive of acceptable performance by the covalent coreaction of soy protein and tannin without any other hardener,thus totally bio-sourced,non-toxic and environment friendly as a base of further advances to expect in future by these two materials combination.展开更多
基金funded by the Natural Sciences and Engineering Research Council of Canada(NSERC,DG RGPIN-2013-201697,DG RGPIN-2018-06556,DG RGPIN-2023-05337,SPG STPGP-2016-493924(Z.D.))New Frontiers in Research Fund,NFRFR-2021-00272(Z.D.)+2 种基金National Natural Science Foundation of China(22004034(X.Q.))Natural Science Foundation of Hunan Province(China)(2020JJ5226(X.Q.))China Scholarship Council(CSC,201908430010(X.Q.)).
文摘Nitrogen-doped carbon quantum dots(N-CQDs)are nanocomposites that can be synthesized by the hydrothermal method.In this work,N-CQDs with the size of 3.2±1.7 nm was prepared from 1 g citric acid and 2 g urea precursor in 10 mL water.Electrochemiluminescence(ECL)of the prepared N-CQDs with K2S2O8 as a coreactant was found to reach a high ECL efficiency up to 109%relative to that of the Ru(bpy)_(3)^(2+)/K_(2)S_(2)O_(8),coreactant system,revealing their great potential for electroanalysis.It is probably because that N elements were doped well in this N-CQDs and increased presence of surface states per mass of N-CQDs.From the spooling ECL spectroscopy,it can be found that the ECL spectra exhibited both a red shift compared with their photoluminescence(PL)spectrum and a wavelength shift during the potentiodynamic scan in the ECL evolution and devolution processes,due to various emissive excited states of N-CQDs leading to higher ECL efficiency.This work gives an insight into development of high ECL efficiency N-CQDs for bioanalytical and light emitting applications.
基金support from Natural Sciences and Engineering Research Council Canada(NSERC,DG RGPIN-2013-201697,DG RGPIN-2018-06556 and SPG STPGP-2016-493924)Canada Foundation of Innovation,Ontario Innovation Trust(CFI/OIT,9040)+1 种基金Premier’s Research Excellence Award(PREA,2003)Western University.
文摘The electrochemiluminescence(ECL)properties of many carbon materials have been reported with glassy carbon(GC),Pt,Au or indium tin oxide(ITO)as the working electrode(WE).As one type of carbon materials,GC itself can generate ECL signal.Some research groups have already noticed the ECL signal from GC WE and reported the results of GC WE with respect to their luminophores.However,comprehensive analyses of ECL properties of GC WE are rare.Herein,the ECL properties of GC WE in organic electrolyte with benzoyl peroxide as the coreactant are reported.Our results are of great importance to distinguish the true ECL data of luminophores from that of GC.
基金supported by the Agence Nationale de la Recherche(NEOCASTIP ANR-15-CE09-0015-03)HL acknowledges the Natural Science Foundations of Jiangsu Province(No.BK20180893).
文摘Electrochemiluminescence(ECL)has attracted considerable interest for many applications such as microscopy,(bio)analysis,light-emitting materials or devices.In this work,we report the fabrication and characterization of ECL-active hydrogel films with tunable thickness.The redox films were prepared by electrochemically-assisted radical polymerization by potential cycling of a PBS solution containing the monomer N-isopropylacrylamide,the initiator potassium persulfate,the cross-linker N,N′-methylenebis(acrylamide)and the Ru(bpy)3 monomer.The deposits were easily prepared in a rapid and well-controlled one-step procedure.The resulting homogeneous films are composed of a poly(N-isopropylacrylamide)(pNIPAM)matrix,which incorporates covalently[Ru(bpy)_(3)]^(2+)centers.The thickness and the number of ECL-active sites is tuned by control-ling the number of voltammetric scans.The deposited pNIPAM films are permeable to water-soluble chemicals such as the coreactant tri-n-propylamine(TPrA).The voltammetric characterization shows a continuous increase of the number of redox-active sites.Results indicate that ECL signals are proportional to the number of electrodeposited[Ru(bpy)_(3)]^(2+)centers.Such approach combining ECL and stimuli-responsive hydrogels open exciting prospects for developing new(bio)sensing materials.
基金financially supported by the NNSF of China(No.22022408)the Chongqing Talents Personnel Support Program(No.CQYC201905067)the Fundamental Research Funds for the Central Universities(No.XDJK2019TJ002)。
文摘Despite the various synthesis approachs to obtain luminous carbon dots(CDs),it is still quite challenging to construct the efficient electrochemiluminescence(ECL)owing to their low ECL reactivity and easy agglomeration.Herein,an efficient and concise ECL system was skillfully constructed by taking advantage of the nitrogen and sulfur co-doped CDs(N,S-CDs)with surfaces rich in hydrazide groups as luminophors to emit intense ECL,and metal-organic framework(MOF)as the matrix to confine CDs in its nanospace.Surprisingly,the proposed CDs assembled MOF(CDs/ZIF-8)enhanced anodic ECL signal up to 250%of pure CDs under the exogenous coreactant-free condition.As a proof of concept,the highly sensitive detection of uric acid(UA)was realized by the constructed ECL platform with a low detection limit of 3.52 nmol/L ranging from 10 nmol/L to 50μmol/L.This work expanded ideas for the application of pore confinement effect,and provided references for the detection of disease biomarkers of gout and hyperuricemia.
基金supported by the National Natural Science Foundation of China(21675022 and 21775018)the Natural Science Foundation of Jiangsu Province(BK20170084)the Fundamental Research Funds for the Central Universities.
文摘Electrochemiluminescent(ECL)technique has drawn increasing attention in a myriad of applications ranging from clinic diagnosis to the environment and food monitoring.The advantages of ECL sensors include high sensitivity,negligible background,and excellent controllability with respect to its counterparts.The past 2 years have witnessed an impetus in the rise of a batch of luminophores and coreactants as advanced materials to boost the ECL efficiencies.In the review,we summarize the latest progress of new ECL biosensing systems,in particular of emerging luminophores,coreactants,and the involved mechanisms.Possible limitations and exciting future developments of the ECL biosensing are also complementarily discussed.It is highly envisioned that the review article would inspire more intriguing advances both in the fundamental research and more demanding practical applications of ECL for prospective biosensing.
基金the National Natural Science Foundation of China[Nos.21675148,21874126,an 21804127]Ministry of Science and Technology of the People’s Republic of China[No.2016YFA0201300]the Chinese Academy of Sciences(CAS)-the Academy of Sciences for the Developing World(TWAS)President’s Fellowship Programme[No.2016CTF032].
文摘Electrochemiluminescence(ECL)-based imaging analysis is a dominant method to inspect the electrode composition,to study electrochemical reaction kinetics at a microscopic level,and also a rapid emerging technology in bioanalysis with high spatiotemporal resolutions,high-throughput and visualization characteristics.In comparison with other imaging microscopes,an optical excitation is not involved in imaging,thus the approach is free from background noise resulting in a low detec-tion limit.In this review work,the principle of ECL,its unique natures compared to other luminescence techniques were briefed at first.Then after,the progress and basic principles of ECL imaging were summarized.Furthermore,recent and representative advances of ECL imaging for visualizing and sensing applications were reviewed.Finally,the perspectives in ECL imaging for further perspective were discussed.
文摘Soy flour(SF),soy protein and soy protein isolates(SPI)have been the focus of increasing research on their application as new materials for a variety of applications,mainly for wood adhesives and other resins.Tannins too have been the focus of increasing research for similar applications.While both materials are classed as non-toxic and have achieved interesting results the majority of the numerous and rather inventive approaches have still relied on some sort of hardeners or cross-linkers to bring either of them or even their combination to achieve acceptable results.The paper after a presentation of the two materials and their characteristics concentrates on the formation of gels,gelling and even hardening in the case of soy-tannin combined resins.The chapter than finishes with details of the formation of resins giving suitable wood adhesive of acceptable performance by the covalent coreaction of soy protein and tannin without any other hardener,thus totally bio-sourced,non-toxic and environment friendly as a base of further advances to expect in future by these two materials combination.
