CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yiqiao Song,Yong Zhang,Mo Ma,Jianxu Ren,Can Liu,Junjiang Tan
In order to realize effective detection of target gas without traditional heating condition, a strategy to detect gas assisted by light illumination has attracted more and more attention. Especially, visible light illumination brings opportunities and challenges for gas detection without heating condition. Herein, the formaldehyde (HCHO) sensing properties of HoFeO 3 nanoparticles assisted by various light illuminations (λ = 365-660 nm) are systematically investigated, and red light with 660 nm is proved to be the best assisting light for HCHO detection. The detection limit of light-assisted gas sensor toward HCHO can reach sub ppm level, which is about 80 ppb. Meanwhile, it can also achieve good anti-interference performance against environmental humidity, namely, the maximum drift of response value is 9 within the humidity range of 11%–75% RH. The low detection limit and outstanding anti-interference against humidity are ascribed to the increase of the activation energy between HCHO and surface adsorbed oxygen ions and the suppression of adsorbed water molecules, which are provided by the 660 nm light illumination.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Chengjun Dong,Xu Liu,Xuechun Xiao,Shangfeng Du,Yude Wang
Monodisperse ZnFe 2 O 4 nanospheres were succesuffully synthesized via a nonaqueous route in benzyl alcohol at low temperaure of 200 °C. It was found that the ZnFe 2 O 4 is 7–16 nm in diameter with a large surface area of 87.40 m 2 /g. The gas sensor based on ZnFe 2 O 4 nanospheres shows a high pontential for detecting low-ppm-level toluene, exhibiting a good linearity ranging from 1 to 100 ppm with a high response (100 ppm:9.98) and excellent selectivity.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Feifei Li,Lin Zhou,Ziqi Zhang,Mengmeng Li,Lin Lei
A facial white light-emitting diode (LED) induced reversible deactivation radical polymerization (RDRP) of methacrylate monomers was successfully conducted by using sub-ppm-level organic dyes as organocatalysts. The organic dyes contained Eosin B (EB), Rose bengal (RB), Eosin Y (EY) and 3,3,5,5-Tetraiodophenolsulfonphthalein (TIPS) with the merits of metal free, non-toxic and inexpensive. The resulted poly (methacrylate) with controlled molecular weights and polydispersity indices were obtained either under white LED irradiation or green and blue LED. The polymerization of various functional methacrylates demonstrated that this polymerization system with dyes as organocatalysts had high monomer versatility. Chain extensions copolymerization verified the living features of reversible deactivation radical polymerization.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON
·
2024
·
IF 2.1
Zixu Li,Fei Wang,Kai Ma,Chao Fang,Qiang Jia,Changhu Chu
Aryl triflate is a type of facile and readily available compounds, which could be used as an alternative substrate for Suzuki cross coupling. In this manuscript, a novel ppm-Pd-Fe/C catalyst has been developed by reduction of palladium acetate and iron trichloride with aqueous hydrazine in situ and supported on activated charcoal. In combined with Sphos, and metal zinc as additives, this catalyst, with 300 ppm palladium loading, could be applied in the Suzuki cross coupling between aryl triflates with aryl neopentylglycolboronates.
研究领域:
有机化学
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Xiangjian Liao,Xingyu Liu,Yilu Wu,Shufen Li,Guojiao Ren,Yuxiang Ou,Shiquan Chen,Zixuan Wu,Aiping Huang,Xianzhe Liu,Jianyi Luo
Acetone is a crucial biomarker of diabetes diagnosis by breath analysis. However, the fabrication of metal oxide semiconductor-based sensors with the desired gas-sensing abilities for sub-ppm acetone detection remains a significant challenge. In this study, heterostructured Ni x Fe 3-x O 4 composites with varying Ni concentrations were effectively developed using a simple one-step solvothermal process followed by post-calcination treatment. The sensor based on Ni x Fe 3-x O 4 composites exhibited excellent gas sensing performance toward 50 ppm acetone due to the formation of unique microstructures and numerous active sites. Notably, the optimum Ni 0.8 Fe 2.2 O 4 sensor demonstrated remarkable sensitivity even at sub-ppm levels, showing good monotonically increasing response (R 2 = 0.994) within the concentration range of 0.1–5.0 ppm acetone. Moreover, distinct signal responses between exhaled breath samples from a healthy individual and a simulated diabetic patient were observed in the Ni 0.8 Fe 2.2 O 4 sensor, implying that the Ni x Fe 3-x O 4 composites provided an alternative novel strategy for the effective detection of acetone in actual breath analysis of diabetes diagnosis.
研究领域:
材料科学
·
医学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Hao Zhao,Yuan Liu,Gaosheng Li,Da Lei,Yuwan Du,Yudong Li,Hui Tang,Xincun Dou
Precise and timely recognition of hazardous chemical substances is of great significance for safeguarding human health, ecological environment, public security, etc., especially crucial for adopting appropriate disposition measures. Up to now, there remains a practical challenge to sensitively detect and differentiate organic amines with similar chemical structures with intuitive analysis outcomes. Here, a unique optical probe with two electrophilic recognition sites for rapid and ultra-sensitive ratiometric fluorescence detection of ethylenediamine (EDA) is presented, while producing distinct fluorescence signals to its structural analog. The probe exhibits ppb/nmol level sensitivity to liquidous and gaseous EDA, specific recognition toward EDA without disturbance to up to 28 potential interferents, as well as rapid fluorescence response within 0.2 s. By further combining the portable sensing chip with the convolutional algorithm endowed with image processing, this work cracked the problem of precisely discriminating the target and non-targets at extremely low concentrations.
研究领域:
分析化学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 22
·14055-14063
·
IF 3.442
Wang Yu-Chong,Sun Zhong-Sen,Wang Su-Zhen,Wang Shu-Ying,Cai Sheng-Xun,Huang Xin-Yu,Li Ke,Chi Zong-Tao,Pan Shu-Di,Xie Wan-Feng
Metal oxide semiconductor sensors based on nanocrystalline In 2 O 3 and its composites are found to be very sensitive in detecting low-concentration (~ 5 ppm) gases such as ozone, nitrogen dioxide, formaldehyde and butane. Here, we successfully obtained fiber-shaped In 2 O 3 crystalline nanofibers via electrospun and calcination routes. The gas sensing properties of the In 2 O 3 nanofibers were studied by exposing them to the acetic acid vapor with different concentrations from 500 ppb to 2000 ppm at the optimum operating temperature (250 °C). The device possesses ultra-high response of 66.7 toward 2000 ppm acetic acid vapor, low response and recovery times of 25 s and 37 s (100 ppm), respectively, and significant selectivity to acetic acid at 100 ppm. In particular, the sensor based on In 2 O 3 nanofibers has very low detection limit and can reach 500 ppb. Therefore, the presented In 2 O 3 nanofiber sensor can be used in practice in acetic acid detection area in the future.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 3
·302
·
IF 3.52
Meng Guo,Zhen Wei,Jianming Yang,Zunyuan Xie,Weiqiang Zhang
In the palladium-catalyzed C−C coupling reaction, electron-rich phosphine ligands and a catalytic amount of catalyst loading are required in most cases. Herein, a bench-stable, easily modified and less toxic alkynone was utilized in palladium-catalyzed Sonogashira coupling to replace conventional phosphine ligands. With 1-(4-methoxyphenyl)-3-phenyl-2-yn-1-one (L2) as the ligand, catalyst loading was reduced to 5-10 ppm. In this newly developed catalytic system, a variety of (hetero)arene iodines and alkynes could be tolerated, resulting in good yields of the corresponding cross-coupling products.Keywords:α;β-alkynone;Pd-catalyzed C−C coupling;π-acidicity
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 23
·18507-18521
·
IF 2.779
Zheng Zichen,Li Ying,Luo Yifan,Debliquy Marc,Zhang Chao
Breath gas detection has attracted significant attention for the early screening of lung cancer. In this paper, we synthesized bismuth ferrite (BiFeO 3 ) nanoparticles via a green and facile microwave hydrothermal method for detecting low concentration isopropanol. The influence of material’s synthesis process parameters, including temperature, time and power of synthesis on the physicochemical properties, has been explored. The structure, morphology and other material properties of BiFeO 3 were analyzed by a series of characterization methods such as scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray electron spectroscopy (XPS). The effects of synthesis process parameters and testing conditions on gas sensing performance were investigated by a four-channel testing chamber. In addition, the mechanism of gas-sensitive response was also discussed. Considering the authentic situation of exhaled breath of human, we conducted the experiment of ultralow concentration and high humidity systematically. Typically, the BiFeO 3 gas sensor revealed extraordinary sensitive performance at an optimal working temperature of 275 °C. An excellent linear relationship existed in the response and gas concentration, as the response value can reach 3.9 towards 1 ppm isopropanol even if it is in a 100% relative humidity (RH) atmosphere.
研究领域:
材料科学
·
医学检测
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Kewei Liu,Zichen Zheng,Jinyong Xu,Chao Zhang
Aimed at the bottleneck problem in conventional gas sensors that the effective detection of CO 2 gas can only be accomplished at concentrations above thousands of ppm and higher operating temperature, in this work, microstructured ZnSnO 3 equipped with rambutan-like hexahedral features with the hollow interior was successfully synthesized through a facile one-step hydrothermal method. Visible light was utilized as an excitation source to further enhance the sensing property. The investigation elaborated that at optimum hydrothermal time of 16 h, ZnSnO 3 showed a high gas response (~4.65), repeatability, and long-term stability towards 400 ppm CO 2 at room temperature. The response under purple light was 3.5 times higher than that under dark conditions, resulting from photoelectrons' generation. Furthermore, ZnSnO 3 sensor had excellent selectivity to 50 ppm CO 2 . The large specific surface area and abundant oxygen vacancies of ZnSnO 3 contribute to the excellent gas-sensing performance, which addresses the dilemma that it is difficult to break through the energy barrier through surface interaction to impact the band structure and carrier concentration because CO 2 is a non-polar molecule formed by polar bonds. Therefore, ZnSnO 3 is a promising material for the development of devices utilized in medical respiratory detection, agricultural crop growth detection and other fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Jove-Journal of Visualized Experiments
·
2022
·
IF 1.424
Xiaofang Liu,Xiang Zhou,Lifeng Zhou,Jiafu Hu,Kai Guo
The pinewood nematode, Bursaphelenchus xylophilus, is one of the most destructive invasive species worldwide, causing the wilting and eventual death of pine trees. Despite the recognition of their economic and environmental significance, it has thus far been impossible to study the detailed gene functions of plant-parasitic nematodes (PPNs) using conventional forward genetics and transgenic methods. However, as a reverse genetics technology, RNA interference (RNAi) facilitates the study of the functional genes of nematodes, including B. xylophilus. This paper outlines a new protocol for RNAi of the ppm-1 gene in B. xylophilus, which has been reported to play crucial roles in the development and reproduction of other pathogenic nematodes. For RNAi, the T7 promoter was linked to the 5′-terminal of the target fragment by polymerase chain reaction (PCR), and double-stranded RNA (dsRNA) was synthesized by in vitro transcription. Subsequently, dsRNA delivery was accomplished by soaking the nematodes in a dsRNA solution mixed with synthetic neurostimulants. Synchronized juveniles of B. xylophilus (approximately 20,000 individuals) were washed and soaked in dsRNA (0.8 µg/mL) in the soaking buffer for 24 h in the dark at 25 °C.The same quantity of nematodes was placed in a soaking buffer without dsRNA as a control. Meanwhile, another identical quantity of nematodes was placed in a soaking buffer with green fluorescent protein (gfp) gene dsRNA as a control. After soaking, the expression level of the target transcripts was determined using real-time quantitative PCR. The effects of RNAi were then confirmed using microscopic observation of the phenotypes and a comparison of the body size of the adults among the groups. The current protocol can help advance research to better understand the functions of the genes of B. xylophilus and other parasitic nematodes toward developing control strategies through genetic engineering.
研究领域:
分子生物学
·
植物病理学
·
线虫学
·
遗传学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Zhu Chonghui,Cheng Xiaoli,Dong Xin,Xu Ying ming
PANI/TiO2 nanocomposites spheres were synthesized using a simple and efficient one-step hydrothermal process. The morphology and structure of PANI/TiO2 nanocomposites spheres were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The PANI/TiO2 nanocomposite sphere-based sensor exhibits good selectivity, sensitivity (5.4 to 100 ppm), repeatability, long-term stability and low detection limit (0.5 ppm) to ammonia at room temperature (20 ± 5°C). It also shows a good linearity relationship in the range of 0.5–5 and 5–100 ppm. The excellent NH3 sensing performance is mainly due to the formation of the p-n heterostructure in the nanocomposites.
研究领域:
材料科学
·
化学传感器
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）