OPTICS COMMUNICATIONS
·
2024
·
IF 2.2
Ganshang Si,Yanchun Wang,Xu Liu,Changwei Sun,Junfang Miao,Zhengang Li
Rapid and accurate analysis of powder samples is crucial for public safety and food security. Raman spectroscopy, noted for its many advantages, traditionally faces issues of low sensitivity and limited detection information when analyzing powder samples. This paper explores a detection method for powder samples using ultraviolet (UV) Raman-fluorescence spectroscopy. By leveraging the principles of Raman and fluorescence spectroscopy, a combined detection optical path was designed. Utilizing a 266 nm laser as the system light source, a UV Raman-fluorescence spectroscopy detection setup was constructed and seven representative powder samples were analyzed. The experimental results demonstrate that the setup effectively detects the Raman spectral features of inorganic powders like baking soda and extracts the fluorescence spectral features of organic powders such as 1,2,4,5-tetramethyltoluene. Additionally, it accurately analyzes the Raman and fluorescence spectral features of amino acids and glyphosate preparation powders. For complex powder samples with issues such as “substances with the same spectrum” and “complex and similar spectra”, UV Raman-fluorescence spectroscopy enhances spectral information dimensions, compensating for the limitations of traditional Raman spectroscopy. Furthermore, a convolutional neural network algorithm was employed to analyze the measured data of the seven powder samples increased the average recognition accuracy (AVG) from 62.53% to 98.41%. This improvement further validates the effectiveness of the proposed method in recognizing the properties of powder samples.
研究领域:
分析化学
·
公共安全
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Baosheng Li,Xue Ma,Yuying Xin,Zoltán Major,Xianfa Zhang,Tingting Wang,Lihua Huo,Xiaoli Cheng,Yingming Xu
Real-time detection and degradation of chemical warfare agents have great importance in both human healthcare and environmental protection. Herein, hierarchical Fe 2 O 3 nanotube arrays were constructed by a simple in situ solvothermal method for effective monitoring of 2-chloroethyl ethyl sulfur enigma (2-CEES). The resultant Fe 2 O 3 sensor exhibited ultrahigh response (9.6) and short response time (3.7 s) to 10 ppm 2-CEES at 170 ℃. The sensor also behaved low detection limit (30 ppb), good stability, and high moisture resistance . Notably, Fe 2 O 3 nanotube arrays demonstrated high degradation capacity (95.2%) (100 ppm, 10 min). Such excellent performance of the portable Fe 2 O 3 sensor for 2-CEES comes from the synergistic effect of multiple microstructural features , active sites, and surface-adsorbed oxygen species at operating temperature. The 2-CEES sensing mechanism of Fe 2 O 3 nanotube arrays has been discussed in detail. This work offers guidance for designing high-performance sensing materials to realize efficient detection of chemical warfare agents.
研究领域:
材料科学
·
环境监测
·
化学传感
·
纳米技术
·
公共安全
✓ 已验证
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 6
·784
·
IF 4.7
Cancan Yan,Molin Qin,Tengxiao Guo,Lin Zhang,Junchao Yang,Yong Pan
The effective detection of isopropyl methylfluorophosphonate (GB, sarin), a type of organophosphine poisoning agent, is an urgent issue to address to maintain public safety. In this research, a gas-sensitive film material, poly (4-hydroxy-4,4-bis trifluoromethyl)-butyl-1-enyl)-siloxane (SXFA), with a structure of hexafluoroisopropyl (HFIP) functional group was synthesized by using methyl vinylpropyl dichlorosilane and hexafluoroacetone trihydrate as initial materials. The synthesis process products were characterized using FTIR. SXFA was prepared on a 200 MHz shear surface wave delay line using the spin-coating method for GB detection. A detection limit of <0.1 mg/m3was achieved through conditional experiments. Meanwhile, we also obtained a maximum response of 2.168 mV at a 0.1 mg/m3concentration, indicating the much lower detection limit of the SAW-SXFA sensor. Additionally, a maximum response standard deviation of 0.11 mV with a coefficient of variation of 0.01 and a maximum recovery standard deviation of 0.22 mV with a coefficient of variation of 0.02 were also obtained through five repeated experiments. The results show that the SAW-SXFA sensor has strong selectivity and reproducibility, good selectivity, positive detection ability, high sensitivity, and fast alarm performance for sarin detection.
研究领域:
化学传感器
·
分析化学
·
材料科学
·
毒理学
·
公共安全
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 46
·65243-65254
·
IF 4.223
Chen Tao,Cao Zhonghong
To explore the relations between the number of accident deaths (NCD) and various factors in construction safety, a multiple linear regression model was established, based on the panel data of economy, construction labor, and the number of accident deaths in 31 provinces (regions) of China from 2009 to 2018. The results show that the average total profits and taxes (TPAT), and the death rate of ten thousand people (DR) are positively correlated with NCD, while the labor productivity (LP) is negatively correlated with it. Under the condition that other factors remain unchanged, NCD increases by 0.02 per a hundred million CNY. However, if DR increases by one ten thousand, NCD will increase by 8.66 on average. On the contrary, when LP increases by a hundred million CNY per ten thousand people, NCD decreases by 0.19. The model also predicts NCD in different provinces and cities from 2019 to 2020 with the method of quadratic exponential smoothing. As well, practice results show that the model is effective and practical.
研究领域:
安全工程
·
建筑工程
·
应用统计学
·
公共安全
·
劳动经济学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Xiaobo Wang,Shuailiang Wang,Kunzhu Huang,Zhiguo Liu,Yongju Gao,Wenbin Zeng
A novel nanosensor based on upconversion nanoparticles, NaYF 4 : Yb, Tm@NaYF 4 , covalently conjugated with fluorogen Rhodol (Rhodol-UCNPs) for the sensitive and point-of-care detection of organophosphonate nerve agent mimic DCP has been fabricated. This nanosensor exhibited upconversion luminescence turn-on and ratiometric detection ability of DCP with satisfactory response speed (within 40 s) and a detection limit of 0.21 μM. Under a 980 nm laser excitation, the blue emission of UCNPs was quenched due to the luminescence resonance energy transfer (LRET) between Rhodol and Tm 3+ doped UCNPs, while the presence of DCP led to the suspension of LRET, as a result, significant fluorescence recovery of UCNPs could be observed. Furthermore, we have developed paper-based devices for the point-of-care detection of DCP with naked eyes, both the color change and the blue fluorescence recovery could inform us the presence of DCP. Such convenient detection strategies have the potential to provide us early warnings of the existence possibilities of any risks from OP nerve agents and thus ensure us of our public security.
研究领域:
生物传感
·
分析化学
·
公共安全
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2015
·Vol. 141
·期 3
·1091-1097
·
IF 4.107
Jian Rong Zhang,Yuan Yuan Yue,Hong Qun Luo,Nian Bing Li
Picric acid (PA) explosive is a hazard to public safety and health, so the sensitive and selective detection of PA is very important. In the present work, polyethyleneimine stabilized Ag nanoclusters were successfully used for the sensitive and selective quantification of PA on the basis of fluorescence quenching. The quenching efficiency of Ag nanoclusters is proportional to the concentration of PA and the logarithm of PA concentration over two different concentration ranges (1.0 nM–1 μM for the former and 0.25–20 μM for the latter), thus the proposed quantitative strategy for PA provides a wide linear range of 1.0 nM–20 μM. The detection limit based on 3σ/K is 0.1 nM. The quenching mechanism of Ag nanoclusters by PA is discussed in detail. The results indicate that the selective detection of PA over other nitroaromatics including 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (2,4-DNT), p-nitrotoluene (p-NT), m-dinitrobenzene (m-DNB), and nitrobenzene (NB), is due to the electron transfer and energy transfer between PA and polyethyleneimine-capped Ag nanoclusters. In addition, the experimental data obtained for the analysis of artificial samples show that the proposed PA sensor is potentially applicable in the determination of trace PA explosive in real samples.
研究领域:
分析化学
·
环境科学
·
公共安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2016
·Vol. 141
·期 9
·2676-2681
·
IF 4.033
Bin Bin Chen,Ze Xi Liu,Hong Yan Zou,Cheng Zhi Huang
The detection of nitroaromatic explosives is of great importance owing to their strong explosive power and harmfulness in terms of the environment, homeland security and public safety. Herein, rare earth-doped carbon dots with multifunctional features were firstly prepared by simply keeping the mixture of terbium(III) nitrate pentahydrate and citric acid at 190 °C for 30 min. The as-prepared terbium doped carbon dots (Tb-CDs), through a rapid and simple direct carbonization route, have a size of about 3 nm, and exhibit excitation wavelength dependent emission of blue fluorescence, are stable, and can be applied for the selective and colorimetric detection of 2,4,6-trinitrophenol (TNP) in the range of 500 nM–100 μM with a limit of detection of 200 nM based on the inner filtering effect (IFE) of the excitation and emission bands of Tb-CDs by TNP and the electron transfer (ET) from Tb-CDs to TNP, giving a precise and highly reproducible result for detecting complex water samples.
研究领域:
环境科学
·
公共安全
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2017
·Vol. 17
·期 11
·2676
·
IF 2.677
Zhaofeng Wu,Haiming Duan,Zhijun Li,Jixi Guo,Furu Zhong,Yali Cao,Dianzeng Jia
The multichannel fluorescent sensor array based on nanofibrous membranes loaded with ZnS quantum dots (QDs) was created and demonstrated for the discriminative detection of explosives. The synergistic effect of the high surface-to-volume ratio of QDs, the good permeability of nanofibrous membranes and the differential response introduced by surface ligands was played by constructing the sensing array using nanofibrous membranes loaded with ZnS QDs featuring several surface ligands. Interestingly, although the fluorescence quenching of the nanofibrous membranes is not linearly related to the exposure time, the fingerprint of each explosive at different times is very similar in shape, and the fingerprints of the three explosives show different shapes. Three saturated vapors of nitroaromatic explosives could be reliably detected and discriminated by the array at room temperature. This work is the first step toward devising a monitoring system for explosives in the field of public security and defense. It could, for example, be coupled with the technology of image recognition and large data analysis for a rapid diagnostic test of explosives. This work further highlights the power of differential, multichannel arrays for the rapid and discriminative detection of a wide range of chemicals.Keywords:discriminative detection;explosive vapors;sensor array;nanofibrous membranes;quantum dots
研究领域:
材料科学
·
化学传感
·
公共安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2016
·Vol. 9
·期 8
·2487-2497
·
IF 8.893
Shi Yu-e,Wang Wenshou,Zhan Jinhua
The sensitive and on-site detection of inorganic explosives has raised serious concerns regarding public safety. However, high stability and non-volatility features currently limit their rapid on-site detection. Surface-enhanced Raman spectroscopy (SERS) is emerging as a powerful technique for the trace-level detection of different molecules. Plasmonic Ag nanowires were produced by a hydrothermal synthesis method using polyvinylpyrrolidone (PVP) as a negatively charged stabilizer. Here, we report a rapid detection method for inorganic explosives based on a simple surface swab with a positively charged diethyldithiocarbamate-modified Ag nanowire membrane coupled with SERS. This membrane, serving as an excellent SERS substrate with high uniformity, stability, and reusability, can capture both typical oxidizers in inorganic explosives and organic nitro-explosives, via electrostatic interaction. The detection level of perchlorates (ClO 4
− ), chlorates (ClO 3
− ), nitrates (NO 3
− ), picric acid, and 2,4-dinitrophenol is as high as 2.0, 1.7, 0.1, 45.8, and 36.6 ng, respectively. In addition, simulated typical inorganic explosives such as black powders, firecrackers, and match heads could also be detected. We believe that this membrane represents an attractive alternative for rapid on-site detection of inorganic explosives with high efficiency.
研究领域:
分析化学
·
材料科学
·
公共安全
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）