OPTICS EXPRESS
·
2015
·Vol. 23
·期 13
·17487-17510
·
IF 3.488
Dibo Hou,Jian Zhang,Zheling Yang,Shu Liu,Pingjie Huang,Guangxin Zhang
The issue of distribution water quality security ensuring is recently attracting global attention due to the potential threat from harmful contaminants. The real-time monitoring based on ultraviolet optical sensors is a promising technique. This method is of reagent-free, low maintenance cost, rapid analysis and wide cover range. However, the ultraviolet absorption spectra are of large size and easily interfered. While within the on-site application, there is almost no prior knowledge like spectral characteristics of potential contaminants before determined. Meanwhile, the concept of normal water quality is also varying due to the operating condition. In this paper, a procedure based on multivariate statistical analysis is proposed to detect distribution water quality anomaly based on ultraviolet optical sensors. Firstly, the principal component analysis is employed to capture the main variety features from the spectral matrix and reduce the dimensionality. A new statistical variable is then constructed and used for evaluating the local outlying degree according to the chi-square distribution in the principal component subspace. The possibility of anomaly of the latest observation is calculated by the accumulation of the outlying degrees from the adjacent previous observations. To develop a more reliable anomaly detection procedure, several key parameters are discussed. By utilizing the proposed methods, the distribution water quality anomalies and the optical abnormal changes can be detected. The contaminants intrusion experiment is conducted in a pilot-scale distribution system by injecting phenol solution. The effectiveness of the proposed procedure is finally testified using the experimental spectral data.
研究领域:
环境科学
·
水处理工程
·
统计学应用
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DOI
PubMed
高影响因子
TALANTA
·
2023
·
IF 6.1
Linlin Yang,Lingfei Li,Renyong Liu,Chenggen Xie,Jun Zhao,Wengui Chang,Lijuan Chen,Yehan Yan,Ningning Zhang,Wei Zhang,Bianhua Liu,Liang Yang
Carbon dots (CDs) as a remarkable fluorescent nanomaterial have the advantages of easy preparation, good photostability and high sensitivity. However, the poor aqueous solution stability of carbon dots largely limited their practical application due to the characteristic of easily forming precipitation for long time storage. Here, a kind of cationic fluorescent carbon dots CDs-P(Ph) 3 was designed by introducing a cationic compound, (4-carboxybutyl) triphenyl phosphonium bromide, to construct an electrostatic shell outside the dots. Such electrostatic shell could highly improve carbon dots stability in an aqueous solution to make CDs-P(Ph) 3 stable for long-term storage with negligible aggregation. Meanwhile, the sensitivity of CDs-P(Ph) 3 for hypochlorous acid (HClO) was also enhanced on the basis of the electron-withdrawing effect of cationic substituents on the surface of carbon dots. The limit of detection of CDs-P(Ph) 3 for HClO was as low as ∼0.32 μM. Additionally, the fluorescence of CDs-P(Ph) 3 could be rapid quenched by HClO with a quenching efficiency of more than 80% within 30 s. The excellent stability of CDs-P(Ph) 3 in an aqueous solution made it suitable for on-site detecting HClO in real samples, such as tap, well and lake water. Such designed fluorescent nanomaterial would provide a practical application pathway for optical sensing detection in environmental samples.
研究领域:
纳米材料科学
·
环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Seung Ha Lee,Salah M. Tawfik,Daniel T. Thangadurai,Yong-Ill Lee
Upconversion nanoparticles (UCNPs) are exclusive photoluminescent (PL) materials with the ability to convert low-energy excitation into high-energy emission via multiphoton absorption processes. In this research, a novel amphiphilic conjugated polythiophene was prepared to act as a functionalizing agent for NaLuF 4 :Yb 3+ /Er 3+ UCNPs. The UCNPs, which were coated with amphiphilic polythiophene, were characterized by using FTIR, TGA, SEM, TEM, UV, and PL. This material was used as an optical sensor to detect Alprenolol, which is widely used for the treatment of high blood pressure. The developed sensor displays good analytical performance including a low limit of detection (LOD = 0.22 nM) and good linearity in the range of 0.5 nM to 75 μM. Furthermore, this sensor was applied successfully to determine the level of Alprenolol in human urine and serum samples with good recoveries of 97–104%.
研究领域:
材料科学
·
分析化学
·
药物分析
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 20
·7407-7414
·
IF 5.7
Zhonghao Liu,Xiaojuan Zhang,Guangyin Qu,Siqi Li,Yan Kuai,Jiangang Gao,Yu Liu,Zhigang Cao,Benli Yu,Zhijia Hu
Chiral liquid crystal (CLC) microcavity lasers have gotten a lot of interest because of their very sensitive response to external stimuli and ability to produce both whispering gallery mode (WGM) lasing and photonic band gap (PBG) lasing. In this work, we report a CLC microcavity laser based on Förster resonance energy transfer (FRET). By introducing FRET, energy transfer of a WGM laser is achieved. And PBG laser emission with a tuning range of 584–696 nm is achieved by temperature modulation. By changing the pump position, a lasing mode switch between FRET of the WGM laser and FRET of the PBG laser can be achieved. The application of energy transfer in CLC microcavities has expanded the spectral range of PBG lasers. The WGM laser generated by energy transfer demonstrated a sensitivity of 2.17 nm °C−1 in a CLC microdroplet with a diameter of 22 μm. This work extends the application of CLC microcavities in the field of optical devices and sensing technologies.
研究领域:
光学
·
材料科学
·
物理化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Lei Han,Shi Gang Liu,Jia Yu Liang,Nian Bing Li,Hong Qun Luo
Glutathione (GSH) plays a critical role in the living system and its abnormalities are closely associated with numerous clinical diseases. Thus, monitoring and detecting the content of GSH in the living system is still of great importance. Herein, a novel dual-signal responsive optical sensor is developed by using resonance Rayleigh scattering (RRS) and colorimetry for sensitive detection of GSH. In this sensor, MnO 2 nanoflakes are used as both GSH recognizer and signal transducer of RRS and colorimetry. The solution of MnO 2 nanoflakes shows strong RRS and absorption signals because MnO 2 nanoflakes possess a large surface area and high molar extinction coefficient. However, MnO 2 can be reduced to Mn 2+ and MnO 2 nanoflakes can be etched to small nanoparticles by GSH, causing both the RRS and absorption signals to decrease. Based on the change of RRS signal and absorbance of MnO 2 nanoflakes, a novel dual-signal responsive optical sensor is successfully constructed to detect the content of GSH. The as-developed optical sensor toward GSH presents a favorable sensitivity with a detection limit of 0.033 and 0.67 μM for RRS and colorimetry, respectively. Furthermore, the as-developed approach is straightforward, quickly responsive, free-label, and cost-effective. More significantly, this method combines the advantages of RRS and colorimetry for the detection of GSH. Beyond this, the proposed RRS method has also been successfully utilized to detect the content of GSH in glutathione injection samples.
研究领域:
分析化学
·
生物传感器
·
纳米技术
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Minggang Zhao,Xiaoming Wang,Zhensen Liang,Bin Zhang,Yiquan Liao,Yichang He,Ye Ma
Analyte-triggered nanoparticle (NP) assemblies in bulk colloidal suspension have been extensively utilized in various optical sensors. Nevertheless, the assembling process is still limited by the slow diffusion dynamics of NPs and the low concentration of analytes in trace detections, which hinders further improvement of the sensitivity and repeatability of the sensors. In this work, by functionalizing the gold NPs with specific ligands, we constructed a dual-mode optical sensing platform for multianalytes based on the plasmonic NP array at the liquid–liquid interface. Through emulsification, the NP diffusion kinetics are boosted for several orders, and the NPs are condensed from the bulk aqueous phase to the liquid–liquid interface as a plasmonic array. The as-formed metasurface generates major reflectance and surface-enhanced Raman scattering changes in response to analytes, providing two optical sensing modes. As prototypes, cysteine and glucose are selected as the target molecules, achieving the limit of detection as 193 ± 2 and 297 ± 12 pM, respectively.
研究领域:
分析化学
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纳米技术
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yangfan Gao,Zhaolong Wang,Yaru Wang,Jun Yan,Yunlin Chen
Chlorinated vapors, as one of the poisonous volatile organic compounds (VOCs), seriously pollute the environment and threaten human health. It still remains a major challenge for designing reliable chlorinated vapors sensing materials with high sensitivity. Herein, we propose a simple yet powerful optical sensor based on zeolitic imidazolate frameworks ZIF-8 three-dimensional photonic crystals (3D PCs), which keeps high efficiency in vapor sensing through varying their effective refractive index (RI). ZIF-8 3D PCs sensors with tunable crystal facets and photonic bandgap were prepared by self-assembly of monodisperse polyhedral ZIF-8 particles, which are truncated rhombic dodecahedral (TRD)-, rhombic dodecahedral (RD)-, truncated cubic (TC)-, and spherical (Sphere) ZIF-8 3D PCs sensors. The application of polyhedral ZIF-8 3D PCs sensors for chlorinated vapors detection was investigated. The selectivity was found to be closely related to the exposed crystal facets, and the TRD ZIF-8 3D PCs sensor exhibited excellent selectivity, sensitivity (0.514 nm ppm −1 ), and sensing performance for chlorobenzene (C 6 H 5 Cl) vapor, the ultrafast response time (≤1 s) and remarkable long-term stability and recyclability, which might ultimately benefit for practical VOCs sensing applications.
研究领域:
材料科学
·
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 3
·67
·
IF 3.553
Chongdai Luo,Yangyang Wang,Xuemeng Li,Xueqin Jiang,Panpan Gao,Kang Sun,Jianhua Zhou,Zhiguang Zhang,Qing Jiang
Saliva contains important personal physiological information that is related to some diseases, and it is a valuable source of biochemical information that can be collected rapidly, frequently, and without stress. In this article, we reported a new and simple localized surface plasmon resonance (LSPR) substrate composed of polyaniline (PANI)-gold hybrid nanostructures as an optical sensor for monitoring the pH of saliva samples. The overall appearance and topography of the substrates, the composition, and the wettability of the LSPR surfaces were characterized by optical and scanning electron microscope (SEM) images, infrared spectra, and contact angles measurement, respectively. The PANI-gold hybrid substrate readily responded to the pH. The response time was very short, which was 3.5 s when the pH switched from 2 to 7, and 4.5 s from 7 to 2. The changes of visible-near-infrared (NIR) spectra of this sensor upon varying pH in solution showed that—for the absorption at given wavelengths of 665 nm and 785 nm—the sensitivities were 0.0299 a.u./pH (a.u. = arbitrary unit) with a linear range of pH = 5–8 and 0.0234 a.u./pH with linear range of pH = 2–8, respectively. By using this new sensor, the pH of a real saliva sample was monitored and was consistent with the parallel measurements with a standard laboratory method. The results suggest that this novel LSPR sensor shows great potential in the field of mobile healthcare and home medical devices, and could also be modified by different sensitive materials to detect various molecules or ions in the future.
研究领域:
生物医学工程
·
分析化学
·
材料科学
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DOI
高影响因子
C-Journal of Carbon Research
·
2025
·Vol. 11
·期 3
·53
·
IF 2.9
Huan Liu,Yuxin Ding,Longping Zhou,Shirui Xu,Bo Liao
Carbon dots (CDs), a class of carbon-based fluorescent nanomaterials, have garnered significant attention due to their tunable optical properties and functional versatility. In this study, we developed a hybrid material by grafting pH- and temperature-responsive copolymers onto CDs via reversible addition-fragmentation chain-transfer (RAFT) polymerization. Triamino-tetraphenylethylene (ATPE) and N-isopropylacrylamide (NIPAM) were copolymerized at varying ratios and covalently linked to CDs, forming a dual-responsive system. Structural characterization using FTIR,1H NMR, and TEM confirmed the successful grafting of the copolymers onto CDs. The hybrid material exhibited pH-dependent fluorescence changes in acidic aqueous solutions, with emission shifting from 450 nm (attributed to CDs) to 500 nm (aggregation-induced emission, AIE, from ATPE) above a critical pH threshold. Solid films of the hybrid material demonstrated reversible fluorescence quenching under HCl vapor and recovery/enhancement under NH3vapor, showing excellent fatigue resistance over multiple cycles. Temperature responsiveness was attributed to the thermosensitive poly(NIPAM) segments, with fluorescence intensity increasing above 35 °C due to polymer chain collapse and ATPE aggregation. This work provides a strategy for designing multifunctional hybrid materials with potential applications in recyclable optical pH/temperature sensors.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
荧光传感
·
智能材料
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Ling Lu,Rundong Zhao,Huang Chen,Liang Tan,Dongxu Chen,Le Liu,Jingyu Xi
The nitrate reduction reaction (NO3RR) is a promising method for ammonia production, but detecting intermediate NO2− in situ during the reaction is challenging. We propose a nitrite concentration sensor based on equivalent absorbance change, comprising a light, absorption, and imaging module, with a linear detection range of 0–1.4 mg L−1. After optimizing the absorption module parameters and applying machine learning noise reduction, the detection limit is 0.0116 mg L−1. Using foam copper as the working electrode, we achieved real-time monitoring of nitrite concentration on the electrode surface during NO3RR, validating the sensor's design. When applied to Co Base/Cu electrodes synthesized via localized electrodeposition, the sensor shows significantly lower nitrite concentration in the electrodeposition area compared to the non-electrodeposition area during NO3RR, indicating superior nitrite utilization by cobalt-based materials. This sensor offers a new approach for investigating NO3RR mechanisms and designing catalysts.
研究领域:
环境科学
·
化学工程
·
材料科学
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产品关联
DOI
高影响因子
Micromachines
·
2024
·Vol. 15
·期 6
·779
·
IF 3
Jiacong Li,Yuxin Ni,Wei Zhang,Elvige Laure Nteppe Nteppe,Yurong Li,Yeshun Zhang,Hui Yan
The detection of the amount of aflatoxin M1 (AFM1) in milk is crucial for food safety. Here, we utilize a fiber optic (FO) localized surface plasmon resonance (LSPR) biosensor by constructing gold nanoparticle (AuNP) multimers, in which the nanogaps amplified the LSPR signal by the hot spot effect, and achieved a highly sensitive detection of f AFM1. Through the optimization of parameter conditions for the fabrication of the sensor and detection system, a high performance result from the FO LSPR biosensor was obtained, and the method for AFM1 detection was established, with a wide detection range of 0.05–100 ng/mL and a low limit of detection (LOD) of 0.04 ng/mL, and it has been successfully validated with the actual sample milk. Therefore, it is a good strategy to fabricate highly sensitive FO LSPR sensors for detecting AFM1 by constructing AuNP multimers, and this approach is suitable for developing other biosensors.
研究领域:
食品科学
·
生物传感技术
·
纳米材料科学
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产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2019
·Vol. 15
·期 30
·6107-6115
·
IF 3.399
Ruiqin Wang,Mengxin Zhang,Ying Guan,Mao Chen,Yongjun Zhang
CO2-monitoring plays an important role in medicine, environmental sciences, and food industries. Here, a new CO2-responsive hydrogel film was fabricated from branched polyethyleneimine (BPEI) and partially oxidized dextran (PO-Dex) via layer-by-layer (LBL) assembly, based on the in situ Schiff base reaction between the two polymers. The swelling behaviours of the films were studied using Fabry–Perot fringes on their reflection spectra. Like ordinary hydrogels, the BPEI/PO-Dex films swell in water. In addition, they swell to a larger degree when CO2 is introduced, due to the reaction between CO2 and the amino groups in BPEI. The CO2-induced swelling can be reported by the shift of the Fabry–Perot fringes on their reflection spectra; therefore, the BPEI/PO-Dex film can be used as an optical sensor for dissolved CO2. In the new sensor, the BPEI/PO-Dex film acts as a CO2-sensing material and Fabry–Perot cavity simultaneously. The introduction of ordered structure is no longer required. The response of the sensor to CO2 is linear and reversible. Unlike other hydrogel-based sensors that suffer from a slow response, the new sensor can respond to CO2 quickly, making it applicable for real-time, continuous monitoring of CO2 levels in solution.
研究领域:
材料科学
·
环境科学
·
医学
·
食品工业
✓ 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）