OPTICS LETTERS
·
2022
·Vol. 47
·期 23
·6293-6296
·
IF 3.56
Chongyang Cai,Leipeng Li,Pei Li,Tao Li,Dengfeng Peng,Yanmin Yang,Yanmin Yang
Mechanoluminescent materials have attracted considerable attention over the past two decades, owing to the ability to convert external mechanical stimuli into useful photons. Here we present a new, to the best of our knowledge, type of mechanoluminescent material, i.e., MgF2:Tb3+. In addition to the demonstration of traditional applications, such as stress sensing, we show the possibility of ratiometric thermometry using this mechanoluminescent material. Under stimulation of an external force, rather than the conventional photoexcitation, the luminescence ratio of 5D3→7F6 to 5D4→7F5 emission lines of Tb3+ is confirmed to be a good indicator of temperature. Our work not only expands the family of mechanoluminescent materials, but also provides a new and energy-saving route for temperature sensing.
研究领域:
材料科学
·
光学
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Lu Liu,Dongyang Tang,Li Xu,Fahim Khan,Isam Ud Din,Zhao Wang,Pengfei Li,Hanyang Li,Enming Zhao,Yang Zhang
Various concentrations of Ho 3+ and Nd 3+ codoped NaYF 4 nanorods were successfully synthesized. On the basis of the upconversion spectra under 808 nm excitation, the luminescence mechanisms were discussed in detail. The ratio of red to green intensity evidently increases with increasing the Nd 3+ content due to the stronger interactions between Ho 3+ and Nd 3+ , which enhance the red emission and suppress the green one. In addition, we found that the red emission is more sensitive to the ambient temperature as compared to the green one, thus validating the thermal sensing by applying the ratiometric method by using these two emission bands. Relatively high sensing sensitivity of 0.9% was obtained, evidencing the great potential of the presented optical thermometer.
研究领域:
材料科学
·
光学
·
纳米技术
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Hui Zhang,Xingcen Liu,Jia Sun,Xia Wu
A novel luminescence phenomenon of homovanillic acid (HVA) that the excitation wavelength is longer than the emission wavelength (LExL, λ ex-L > λ em ) was observed, which was monitored by using a common spectrofluorometer with a xenon lamp as an excitation light source. As the addition of Fe 3+ , the intrinsic fluorescence of HVA at 310 nm was obviously quenched and a new emission peak at 424 nm emerged and raised under 557 nm excitation. The similar emission spectra of HVA-Fe 3+ were also obtained at 287 nm excitation. Thus, a dual-mode ratiometric fluorescence (RF) method for detecting Fe 3+ was developed based on LExL and Stokes fluorescence (SF) of HVA. The RF signals of lg( I 424 nm / I 310 nm ) had excellent linearity with Fe 3+ concentration in the range of 0.50–100 μM. Their detection limits were 0.073 μM and 0.090 μM for the LExL and SF methods, respectively. The LExL and SF methods exhibited high selectivity for detecting Fe 3+ , and the former has stronger anti-interference ability to Cu 2+ , Fe 2+ etc. The proposed two methods were successfully applied for the determination of Fe 3+ in actual water samples. The interaction mechanism of HVA with Fe 3+ was also studied.
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Meng Xia,Fengjin Shi,Yinghui Xia,Jing Sun,Xian-En Zhao,Shuyun Zhu
A ratiometric fluorescence assay for alendronate (ALDS) has been designed with Ce 4+ -triggered cascade chromogenic reaction. This strategy involves three processes: (1) Ce 4+ oxidizes ascorbic acid (AA) into dehydroascorbic acid (DHAA), which then condenses with o -phenlenediamine (OPD) to generate fluorescent 3-(dihydroxyethyl)furo[3,4- b ] quinoxaline-1-one (DFQ), presenting the maximum emission at 434 nm; (2) As oxidase-mimics, Ce 4+ can oxidize OPD into fluorescent 2,3-diaminophenazine (DAP) which shows a strong emission at 568 nm; (3) ALDS inhibits the oxidation ability of Ce 4+ towards OPD, thus inhibiting the generation of DAP. Accordingly, a homogeneous ratiometric fluorescence system with dual emission comes into being and the presence of ALDS can change the fluorescence intensity ratio obviously. With F 434 / F 568 as readout, ALDS can be detected sensitively with the detection limit of 30 nM. Moreover, this ratiometric method was used to analyze ALDS in both human serum and pharmaceutical samples.
研究领域:
分析化学
·
药物分析
·
生物医学
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产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2023
·Vol. 38
·期 8
·1465-1476
·
IF 2.9
Sheng Wu,Puxian Xiong,Kexin Qin,Yao Xiao,Binli Xiao,Kang Chen,Dongliang Jiang,Yinzhen Wang
Mechanoluminescence (ML) materials have found potential applications in information storage, anti-counterfeiting, and stress sensing. Conventional stress sensing based on absolute ML intensity is prone to significant mistakes owing to the unpredictability of measurement surroundings. However, implementing a ratiometric ML sensing technique may considerably ameliorate this issue. In this study, a single activator-doped gallate material (LiGa 5 O 8 :Pr 3+ ) is proposed to determine the relationship between the ML intensity and the change in local positional symmetry that occurs when the material is subjected to stress. The sensing reliability of the ML intensity ratio under different factors (Force; Content; Thickness and Materials) is systematically analyzed, where the factor that has the greatest effect on the proportional ML is the concentration, with the ML intensity asymmetry ratio decreasing from 1.868 to 1.300 varying concentration at constant stress. The colour-resolved visualization of stress sensing is further realized, which opens a new path for a ratiometric ML-based strategy to improve the reliability of stress sensing.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Zhi-Qiang Zhou,Yuan-Ping Liao,Jing Yang,Shan Huang,Qi Xiao,Li-Yun Yang,Yi Liu
Developing simple and sensitive non-aggregation strategy for detecting Cd 2+ is necessary for improving the selectivity and sensitivity of probe. Here, we establish a simple, rapid and ratiometric strategy for the recognition of Cd 2+ based on the formation of core-shell ZnSe/CdS structure using ZnSe quantum dots (QDs). The transformation from binary ZnSe QDs to core-shell ZnSe/CdS QDs both change the elemental composition and structure of ZnSe QDs, leading to the changes in band gap of ZnSe QDs, which could be observed in the UV–vis spectra. In the detection process, ZnSe QDs only possess absorption peak at 343 nm, the formation of ZnSe/CdS after the addition of Cd 2+ leads to the appearance of the new peak at 397 nm, while other heavy metal ions could not cause the appearance of new absorption peak. Therefore, this strategy shows good selectivity for Cd 2+ detection. Based on this strategy, the limit of detection (LOD) for Cd 2+ is 11 nM by UV–vis spectroscopy with a desirable relation of linearity (R 2 = 0.999) between A 397 /A 343 and Cd 2+ contents, which is superior to the LOD of most reported nanomaterials . The response time for Cd 2+ detection is as short as 60 s, which is suitable for rapid detection. This ratiometric probe has also been applied to the detection of Cd 2+ in tap water samples, the recovery of Cd 2+ was between 94.9% and 105.6% for tap water samples, indicating the high accuracy of our ratiometric assay. Our strategy not only provided a new method for detecting Cd 2+ , but also put forward an implication that the band energy changes of QDs caused by heavy metal ions can be applied in the selective and sensitive detection of heavy metal ions.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Leipeng Li,Feng Qin,Lu Li,Hong Gao,Zhiguo Zhang
Optical ratiometric thermometry, based on the luminescence of trivalent rare-earth ions, has attracted considerable attention because of its noncontact working pattern, short response time, and strong antidisturbance ability. However, conventional optical thermal detection, on the basis of thermally linked states, has a relatively low relative sensitivity. To circumvent the limitation, here, a new strategy for boosting the relative thermal sensitivity, especially at relatively high temperatures, is introduced. It depends on two totally different mechanisms which own the contrary temperature dependences. For one thing, when excited at 310 nm, the green luminescence originating from CaWO4:Tb3+ phosphors increases monotonously because of the red shift of the charge-transfer band of the WO42– group. For another, this luminescence shows decreasing tendency gradually upon being directly excited at 380 nm. Thus, the intensity ratio between the luminescence obtained at two different excitation conditions is exploited for optical thermometry with success. By using this strategy, the relative thermal sensitivity is as high as 0.71% K–1 at 783 K, which is increased by more than fourfold compared with the conventional method that depends on the thermally coupled states of the Er3+ ion, which are the 2H11/2 and 4S3/2 states. Moreover, this value is also among the highest sensitivities reported so far for ratiometric thermal sensing. What is more, it has been demonstrated that the sensitivity can be adjusted easily by changing the excitation wavelength. Therefore, the work provides an effective strategy for boosting the thermal sensitivity for optical ratiometric thermometry, which contributes to highly sensitive thermal detection in the future.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Liang Tian,Yi Zhang,Liubo Wang,Qingjun Geng,Daxi Liu,Lili Duan,Yihong Wang,Jiansheng Cui
Based on the signal amplification elements of planar VS2/AuNPs nanocomposites and CoFe2O4 nanozyme, we herein developed an electrochemical biosensor for sensitive kanamycin (Kana) quantification. A ratiometric sensing platform was presented by incorporating VS2/AuNPs nanocomposites as a support material with excellent conductivity and high specific surface area, as well as hairpin DNA (hDNA) with complementary hybridization of biotinylated Kana-aptamer. In addition, streptavidin-functionalized CoFe2O4 nanozyme with superior peroxidase-like catalytic activity were immobilized onto the aptasensor, hence the peroxidase-like catalytic reaction could yield amplified electrochemical signals. With the presence of Kana, the aptamer-biorecognition resulted in a quantitative decrease of nanozyme accumulation and an increase of methylene blue response. Under optimal conditions, the electrochemical signal ratio of the aptasensor revealed a linear relation along with the logarithmic concentration of Kana from 1 pM to 1 μM, with the limit of detection reaching to 0.5 pM. Moreover, this aptasensor exhibited excellent precision, as well as high repeatability, hence possessing potentials in real samples and for diverse targets detection by easy replacement of the matched aptamer.
研究领域:
生物传感
·
分析化学
·
纳米材料
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 2
·715-721
·
IF 3.741
Wu Rurong,Liao Lifu,Li Shijun,Yang Yanyan,Xiao Xilin,Nie Changming
We describe a ratiometric colorimetric method for the determination of coenzyme A (CoA) by using gold nanoparticles (AuNPs) and bis-uranyl-bis-sulfosalophen (BUBSS) as optical probes. BUBSS is a binuclear uranyl complex and formed through the chelating reaction of two uranyl ions with bis-sulfosalophen. CoA is captured by the AuNPs via the thiol group and this leads to the formation of CoA-AuNPs. In a second step, BUBSS binds two CoA-AuNPs through a coordination reaction between the uranyl ions in BUBSS and the phosphate groups in CoA-AuNPs. This causes the CoA-AuNPs to aggregate and results in a color change from wine red to blue. A ratiometric colorimetric assay was established for CoA based on the ratiometric measurement of absorbance changes at 650 and 525 nm. Their ratio is linearly related to the concentration of CoA in the 0 to 1.2 μmol⋅L -1 range, with a 6 nmol⋅L -1 detection limit under optimal conditions. The method was successfully applied to the determination of CoA in spiked liver samples with recoveries between 99.4 and 102.6 %.
Gold nanoparticles (AuNPs) capture Coenzyme A (CoA) firstly and then bind bis-uranyl-bis-sulfosalophen (BUBSS). This causes their aggregation and results in a color change. A ratiometric colorimetric assay was established for CoA based on measuring absorbances at 630 and 525 nm.
研究领域:
分析化学
·
生物化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4306
·
IF 5.719
Huifang Wu,Mengqi Xu,Yubing Chen,Haoliang Zhang,Yongjun Shen,Yanfeng Tang
The specific detection of oxytetracycline (OTC) residues is significant for food safety and environmental monitoring. However, rapid specific determination of OTC from various tetracyclines is still challenging due to their similar chemical structures. Here, nitrogen-doped carbon dots (NCDs) with excitation and pH-dependent optical properties and a high-fluorescence quantum yield were successfully synthesized, which were directly employed to fabricate a dual-response fluorescence probe by self-assembly with Eu3+(NCDs/Eu3+) for the ratiometric determination of OTC. The addition of OTC into the probe greatly enhances the characteristic emission of Eu3+due to the “antenna effect”, and the incorporation of NCDs into the probe further improves the Eu3+fluorescence by remarkably weakening the quenching effect caused by H2O molecules and efficiently shortening the distance of energy transfer from OTC to Eu3+. Meanwhile, the fluorescence of NCDs apparently decreases due to aggregation-caused quenching. The results demonstrate that a ratiometric detection of OTC (0.1–25 µM) with a detection limit of 29 nM based on the double response signals is achieved. Additionally, visual semi-quantitative assay of OTC can be realized with the naked eye under a 365 nm UV lamp according to the fluorescence color change of the as-fabricated probe. This probe exhibits acceptable specificity and anti-interference for OTC assay, holding promise for the fast detection of OTC in real water and milk samples.Keywords:oxytetracycline;nitrogen-doped carbon dots;lanthanide;ratiometric;visual analysis
研究领域:
食品安全
·
环境监测
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Lingyan Ma,Di Wu,Lianzhe Hu,Rui Xiao,Kanglin Pei,Wenjing Qi
Phenylglyoxylic acid (PGA) as styrene metabolite is an indicator of styrene occupational exposure. In this work, a novel anodic and cathodic dual-emitting electrochemiluminescence (ECL) ratiometric method for PGA detection is developed using persulfate (S 2 O 8 2- ) and silver metal organic frameworks (Ag-MOFs) amplification strategy. PGA can enhance anodic ECL intensity of Ru(bpy) 3 2+ /PGA system nearly 2 times and cathodic ECL intensity nearly 16 times. S 2 O 8 2- and Ag-MOFs as co-reactant accelerators promote redox reaction of PGA and enhance ECL intensity. Ag + can catalyze S 2 O 8 2- to produce SO 4 ·- , which can convert Ag + to Ag 2+ . Furthermore, SO 4 ·- can accelerate the transformation of Ag + generating more Ag 2+ . Compared with Ru(bpy) 3 2+ system, cathodic ECL intensity of Ru(bpy) 3 2+ /K 2 S 2 O 8 /Ag-MOFs/PGA system gets enhanced nearly 170 times and anodic ECL intensity gets enhanced nearly 6 times. First electro-reduction and then electro-oxidation using scanning potential direction of 0→− 1.3 V→1.4 V→0 also simultaneously enhanced cathodic and anodic ECL nearly 2 times. Thus this ECL ratiometric method for PGA detection has high sensitivity with LOD of 0.8 nM and rapid response once PGA is added in an instant (several seconds). More importantly, anodic and cathodic dual-emitting improves selectivity and avoid interference in complex detection.
研究领域:
分析化学
·
环境科学
·
职业健康
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 5
·1-9
·
IF 6.232
Fang Dandan,Zeng Baoshan,Zhang Shupei,Dai Hong,Lin Yanyu
A self-enhanced electrochemiluminescent ratiometric immunoassay for zearalenone is described. A system composed of N-aminobutyl-N-ethylisoluminol (ABEI) and glutathione (GSH) produces a strong electrochemiluminescence (ECL) at an applied potential of 0.8 V, probably because of short electron transfer distance and reduced energy loss. The method also uses octahedral anatase mesocrystals (OAM) with a large specific surface facilitating immobilization of ABEI and GSH. Helical carbon nanotubes, possessing a large specific surface, superior mechanical stability, and excellent electrical conductivity which serve as a solid support, greatly enhanced the loading capacity for g-C 3 N 4 nanosheets and horseradish peroxidase-labeled anti-antibody. The peroxidase accelerates the decomposition of H 2 O 2 to produce reactive oxygen species (ROSs), amplifying the blue ECL of ABEI and the green ECL of g-C 3 N 4 . The ratiometric sandwich immunoassay (performed by the ratio of ECL intensity at − 1.3 V and 0.8 V) allows for sensitive and reliable determination of ZEN in a wide linear range from 1.0 × 10 −4 ng/mL to 10 ng/mL. The method was successfully applied to the analysis of corn hazelnut samples for ZEN.
Schematic presentation of a self-enhanced electrochemiluminescent ratiometric immunosensor based on octahedral anatase mesocrystals (OAM) supported ABEI-glutathione (GSH) and g-C 3 N 4 functionalized helical carbon nanotubes (HCNT) for zearalenone (ZEN) determination.
研究领域:
分析化学
·
食品安全检测
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）