Materials
·
2023
·Vol. 16
·期 4
·1517
·
IF 3.4
Deqi Zhang,Shenghui Guo,Jiyun Gao,Li Yang,Ye Zhu,Yanjia Ma,Ming Hou
In this paper, with the help of the method of composite materials science, parallel synthesis and high-throughput screening were used to prepare gas sensors with different molar ratios of rare earths and precious metals modified In2O3, which could be used to monitor and warn the early leakage of gasoline and diesel. Through high-throughput screening, it is found that the effect of rare earth metal modification on gas sensitivity improvement is better than other metals, especially 0.5 mol% Gd modified In2O3(Gd0.5In) gas sensor has a high response to 100 ppm gasoline (Ra/Rg= 6.1) and diesel (Ra/Rg= 5) volatiles at 250 °C. Compared with the existing literature, the sensor has low detection concentration and suitable stability. This is mainly due to the alteration of surface chemisorption oxygen caused by the catalysis and modification of rare earth itself.Keywords:high-throughput screening;surface modification;In2O3;gas sensor;fuel volatiles
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Haixia Wu,Quanfa Zhao,Wang Shen,Xiao Han,Bin Zheng,Ruoyu Liu,Shaohua Lin
In recent years, non-thermal plasma technology as an advanced oxidation process has received increasing attention for wastewater treatment . In previous studies, the discussion about the effects caused by different metal electrodes in the plasma treatment system is limited. In this work, phenol degradation efficiency and H 2 O 2 formation with Al, Ti, Fe, Ni, Cu, W, and Mo electrodes were investigated. The use of Fe, Ni, and Al electrodes results in higher phenol removal, than that using W, Cu, Mo, and Ti electrodes. After 70 min of discharge treatment, phenol was continuously decomposed in the solution in the Fe, Cu, and Mo electrodes systems. High peak voltage promoted phenol degradation and H 2 O 2 generation, especially for Fe, Ti and Ni electrodes. The alkaline condition is more conducive to phenol degradation than the neutral and acidic conditions regardless of the electrode type. Fe, Al, Cu, and Ni electrodes are affected more by the adjustment of the conductivity with Cl − than that with SO 4 2− . The dominant influence on H 2 O 2 production and decomposition could be attributed to the catalysis of metal particles and metal ions produced by electrode erosion. According to the radical quenching experiments, the main radicals in the degradation of phenol when using each electrode material were analyzed.
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Atmosphere
·
2019
·Vol. 10
·期 2
·88
·
IF 2.046
Rui Li,Xiaotong Jiang,Xinfeng Wang,Tianshu Chen,Lin Du,Likun Xue,Xinhui Bi,Mingjin Tang,Wenxing Wang
Semivolatile organic nitrates (SVONs) contribute a large proportion of total organic nitrates and play an important role in the tropospheric chemistry. However, the composition and concentrations of SVONs in the atmosphere remain unclear due to the lack of reliable analytical techniques for specific organic nitrates. In this study, a method based on gas chromatography and electron ionization–mass spectrometry was developed to detect ambient SVONs that were collected via polyurethane foam disk enrichment. Three SVONs were identified in the semivolatile samples from urban Jinan during spring based on the characteristic fragment ions of [NO2]+and [CH2NO3]+and the characteristic fragment loss of NO2and NO3: 1-pentyl nitrate (molecular weight [MW] = 133), 4-hydroxy-isoprene nitrate (MW = 147), and (3,4)-di-hydroxy-isoprene nitrate (MW = 163). The latter two isoprene nitrates were rarely detected in the real atmosphere in previous studies. The contents of 1-pentyl nitrate, 4-hydroxy-isoprene nitrate, and (3,4)-di-hydroxy-isoprene nitrate were roughly quantified based on the standard of 1-pentyl nitrate, with a detection limit of 50 μg L−1. In addition, Fourier transform infrared spectrometry was used to determine the total SVONs content. The average concentrations of 1-pentyl nitrate, 4-hydroxy-isoprene nitrate, (3,4)-di-hydroxy-isoprene nitrate, and total SVONs in Jinan during spring were 20.2 ± 7.2, 13.2 ± 7.2, 36.5 ± 8.4, and 380.0 ± 190.8 ng m−3, respectively. The three identified SVONs contributed only 20.2 ± 5.5% to the total SVONs, which suggests that some unidentified SVONs are present in the ambient atmosphere and that studies with improved or advanced analytical techniques will be required to identify them.Keywords:organic nitrates;semivolatile sample;GC/EI-MS;identification;semiquantification
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Analytical Methods
·
2014
·Vol. 6
·期 13
·4895-4900
·
IF 1.938
Jianqiao Xu,Shuming He,Ruifen Jiang,Fang Zhu,Jingwen Ruan,Hong Liu,Tiangang Luan,Gangfeng Ouyang
Recent developments of solid-phase microextraction (SPME) in biological and environmental analysis calls for robust and low-cost fibers that are prone to batch preparation with good reproducibility. However, the expensive commercial fibers and low reproducible home-made fibers cannot fully cater these requirements. In the present study, an extremely low-cost (less than one dollar) SPME fiber with good intra-fiber (RSDs% ≤ 1.6%, n = 6) and inter-fiber reproducibility (RSDs% ≤ 6.2%, n = 6) was prepared by mounting a piece of commercially available polydimethylsiloxane (PDMS) tubing on a stainless steel wire with epoxy glue. This configuration was stable for more than 100 extraction/thermal desorption cycles. In addition, compared with previously used thicker PDMS fiber, the capability of direct thermal desorption in gas chromatograph of the present fiber not only simplified the sample preparation process but also enhanced the analysis sensitivity. Excellent inter-fiber reproducibility and low cost even made the fiber disposable when used in complex matrices.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xin Dong,Xiaoli Cheng,Xianfa Zhang,Lili Sui,Yingming Xu,Shan Gao,Hui Zhao,Lihua Huo
The coral-shaped Dy 2 O 3 was prepared by a simple and environmentally friendly hydrothermal reaction combined with subsequent calcination. The coral-shaped Dy 2 O 3 was assembled by clusters, which were constructed by nanoparticles, whose sizes are 12.3 ± 3.6 nm. The gas sensors were investigated with nine gases at room temperature, and show a high response and selectivity to NH 3 . Compared with other reported metal oxide-based sensors, Dy 2 O 3 sensor exhibits not only high sensitivity, good selectivity and reproducibility to NH 3 at room temperature, but also two good linear relationships when the concentration of NH 3 is in the range of 0.1–1 ppm and 1–100 ppm. The good gas sensing property is mainly because of the 3D hierarchical structure of coral-like Dy 2 O 3 , which has a large specific surface area. This benefits NH 3 molecules to adsorb/desorb onto/from the surface as well as the electron transfer. In addition, the possible NH 3 -sensing mechanism is discussed in detail.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Zhuoqi Li,Peng Song,Zhongxi Yang,Qi Wang
In situ diffusion growth of CoMoO 4 nanoparticles on the surface of MoO 3 nanobelts was achieved through a facile method. The microstructures, morphologies, and chemical composition of the nanocomposites were investigated based on X-ray diffraction, field-emission electron scanning microscopy, transmission electron microscopy , energy dispersive spectroscopy, and X-ray photoelectron spectra. The characterization results confirmed CoMoO 4 nanoparticles uniformly distributed on the surface of the MoO 3 nanobelts. The trimethylamine sensing properties of pristine MoO 3 and CoMoO 4 /MoO 3 nanocomposites were investigated using a static system. The experimental results revealed that heterojunction structure of CoMoO 4 /MoO 3 nanocomposites displayed low working temperature and enhanced sensing performance. The response of CoMoO 4 /MoO 3 nanocomposites to 100 ppm trimethylamine was ∼104.8 at 220 °C, which was four times higher than that of pure MoO 3 at 280 °C. The reason for the enhanced sensing properties of CoMoO 4 /MoO 3 nanocomposites is attributed mainly to the formation of the p–n junction between the p-type CoMoO 4 nanoparticles and the n-type MoO 3 nanobelts.
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高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2017
·Vol. 218
·期 22
·1700275
·
IF 2.5
Jiawei Xu,Chong Zhang,Zexiong Qiu,Zhenyu Lei,Bing Chen,Jia-Xing Jiang,Feng Wang
Two kinds of novel triphenylphosphine-containing microporous organic polymers are designed and synthesized via palladium-catalyzed Sonogashira−Hagihara coupling condensation reaction of triphenylphosphine oxide- and sulfide-based monomers with different arylethynylene linkers. The gas adsorption isotherms reveal that these polymers have strong binding affinity for CO 2 with high CO 2 adsorption capacity, although they have moderate Brunauer−Emmett−Teller surface area ranging from 684 to 883 m 2 g −1 . Among the resulting polymers, triphenylphosphine oxide–tris(4-ethynylphenyl)amine exhibits the highest CO 2 uptake capacity of 2.61 mmol g −1 at 273 K and 1.13 bar with relatively high gas selectivity of 60.2 for CO 2 over N 2 at 273 K.
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高影响因子
Results in Engineering
·
2025
·
IF 7.9
Hao Sun,Guoxin Jiang,Shenghui Guo,Ming Hou,Li Yang,Xiaolei Ye,Yi Xia,Qiuni Zhao
Gas sensors based on MEMS are facing challenges such as the limited variety of micro-hot (MHP) plate structures and the low heating efficiency of MHP. This work employed COMSOL's multiphysics coupling capabilities combined with experimental validation to design and simulate a MHP structure characterized by high heat transfer efficiency, low stress, and structural stability. Based on the diverse thermal and mechanical simulation outcomes, an in-depth investigation into the influence mechanisms of MHP structural morphology, geometry, electrode patterns, and other conditions on the temperature field and thermal stress concentration within MEMS devices was conducted. This work designed and obtained the optimal device structure. At the same time, verification is conducted through experimental methods. Based on simulation results, two MHP devices were developed and manufactured using zinc oxide as the gas-sensitive material to validate their performance. Using MEMS micro-electro-mechanical systems, hydrogen gas at 500 ppm was detected at different temperatures, while their thermal and mechanical properties were simultaneously investigated. The MHP structure designed in this paper achieves the optimal operating temperature of 265°C at an extremely small voltage (0.2V), while the overall structure maintains a small deformation (<2μm). The response values of the two devices to hydrogen gas reached 6.55 and 5.47, respectively, far exceeding those of conventional planar devices. This work shows a new design method of mems chip, which can measure the concentration of hydrogen more accurately and has accurate gas sensitivity measurement ability. It plays an important role in the field of hydrogen energy safety.
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产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Jiaxu Li,Songlin Wang,Lei Lai,Pingwei Liu,Haiqiang Wu,Jinlong Xu,Steven J. Severtson,Wen-Jun Wang
There is currently great interest in biodegradable alternatives for packaging and agricultural applications. The most viable biodegradable alternative, poly (butylene adipate-co-terephthalate) (PBAT), has poor resistance to water vapor and oxygen permeation and tends to degrade rapidly under solar exposure. Herein, we report a preparation of PBAT nanocomposite films with aligned graphene nanosheets both in and on the films by combining two techniques, biaxial orientation and rod scarping. The composite films with a graphene content of 0.48 vol% exhibited 80% decrease of water vapor permeability and over 99% decrease of oxygen permeability , approaching values of 1.0 × 10 −11 g m m −2 ·Pa −1 s −1 and 6.2 × 10 −16 cm 3 cm cm −2 ·Pa −1 s −1 . These values are respectively comparable to and even lower than the reported 9.9 × 10 −12 g m m −2 ·Pa −1 s −1 and 8.0 × 10 −15 cm 3 cm cm −2 ·Pa −1 s −1 for polyethylene films. After a 200 h aging, the composite films still possessed a fracture strength of 47.3 MPa and an elongation at break of 167%, in contrast to a complete fragmentation of pure PBAT. We believe that the controlled incorporation of aligned graphene nanosheets to biodegradable polymers could become an important strategy to develop sustainable packaging and agricultural films.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Rencong Geng,Tingye Fan,Ping Yang,Wenlei Jia,Ju Zhou,Mingwei Li,Wenhan Qi,Shiqi Li,Jiao Han,Yiming Zeng
Si 3 N 4 ceramics are highly valued for their exceptional thermal conductivity and mechanical properties. This study investigated the effects of different addition ratios of Y 2 O 3 -MgO-MgSiN 2 ternary sintering additives on liquid phase viscosity, densification, microstructure, thermal conductivity and mechanical properties. The incorporation of MgSiN 2 as sintering additives introduced additional Si and N into the liquid phase, forming a nitrogen-rich liquid phase that promoted the grain growth showing a bimodal distribution. When the MgO/MgSiN 2 ratio reached 2/3, the moderate liquid phase viscosity facilitated enhanced densification and grain growth. This resulted in an increased number of large grains, a moderate grain size distribution, and a good bimodal microstructure. Consequently, the 2M3N exhibited superior properties, including a thermal conductivity of 105.22 W m −1 K −1 , a fracture toughness of 5.91 MPa m 1 / 2 , and a bending strength of 726.12 MPa. The study demonstrates that precise control of the Y 2 O 3 -MgO-MgSiN 2 ratio can effectively regulate the microstructure, leading to improved thermal and mechanical performance.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaoshun Wei,Xuechun Yang,Yun Guo,Yinzhong Liu,Lingchao Wang,Qingjie Wang,Lingli Cheng,Zheng Jiao
In this study, a novel UV-enhanced Mg-doped MOF-ZnO sensor was investigated for its efficient detection of n-butanol gas at lower temperatures. The composite samples were prepared by the co-precipitation method with the appropriate component ratio. The structure, morphology, and optical properties of the as-prepared samples were systematically analyzed through XRD, SEM, TEM, BET, XPS, and UV–vis characterizations. The gas-sensitive performances based on the pristine MOF-ZnO and Mg-doped MOF-ZnO sensor series with the doping levels of 1 %, 3 %, 5 %, and 7 % (wt%) were comprehensively evaluated by adopting the gas-sensitive system. Among them, the 3 % Mg:MOF-ZnO sensor has given prominence to the largest specific surface area and highest oxygen vacancy concentration demonstrating the most excellent gas-sensing performance. Furthermore, with the aid of UV excitation, the 3 % Mg:MOF-ZnO sensor had achieved the enhanced response value of 2049 that was 4.44 times higher than that of pristine MOF-ZnO to 100 of ppm n-butanol at a low temperature of 246 °C, additionally presented out the superior reproducibility with speedy response/recovery time (12/22 s), the theoretical detection limit as low as 200 ppb, as well as the excellent long-term stability and selectivity for n-butanol. This study offers a promising strategy for the well-development of high-performance n-butanol sensors.
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DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Binbin Chu,Zhiming Chen,Xiaofeng Wu,Haoliang Shi,Xiangbowen Jin,Bin Song,Mingyue Cui,Yadan Zhao,Yingying Zhao,Yao He,Houyu Wang,Fenglin Dong
To date, long-term and continuous ultrasonic imaging for guiding the puncture biopsy remains a challenge. In order to address this issue, a multimodality imaging and therapeutic method was developed in the present study to facilitate long-term ultrasonic and fluorescence imaging-guided precision diagnosis and combined therapy of tumors. In this regard, certain types of photoactivated gas-generating nanocontrast agents (PGNAs), capable of exhibiting both ultrasonic and fluorescence imaging ability along with photothermal and sonodynamic function, were designed and fabricated. The advantages of these fabricated PGNAs were then utilized against tumors in vivo, and high therapeutic efficacy was achieved through long-term ultrasonic imaging-guided treatment. In particular, the as-prepared multifunctional PGNAs were applied successfully for the fluorescence-based determination of patient tumor samples collected through puncture biopsy in clinics, and superior performance was observed compared to the clinically used SonoVue contrast agents that are incapable of specifically distinguishing the tumor in ex vivo tissues.
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）