SENSORS
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2022
·Vol. 23
·期 1
·148
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IF 3.847
Ji Zhang,Xu Li,Qinhe Pan,Tong Liu,Qingji Wang
Hydrogen (H2) has gradually become a substitute for traditional energy, but its potential danger cannot be ignored. In this study, litchi-like g-C3N4/In2O3composites were synthesized by a hydrothermal method and used to develop H2sensors. The morphology characteristics and chemical composition of the samples were characterized to analyze the gas-sensing properties. Meanwhile, a series of sensors were tested to evaluate the gas-sensing performance. Among these sensors, the sensor based on the 3 wt% g-C3N4/In2O3(the mass ratio of g-C3N4to In2O3is 3:100) showeds good response properties to H2, exhibiting fast response/recovery time and excellent selectivity to H2. The improvement in the gas-sensing performance may be related to the special morphology, the oxygen state and the g-C3N4/In2O3heterojunction. To sum up, a sensor based on 3 wt% g-C3N4/In2O3exhibits preeminent performance for H2with high sensitivity, fast response, and excellent selectivity.Keywords:g-C3N4/In2O3;litchi-like;H2sensor;fast response;high selectivity
研究领域:
材料科学
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传感器技术
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Lili Tian,Miaomiao Sun,Yinglin Liu,Bingyu He,Guangli Dong,Hong Hao
The development of superhydrophobic and highly oleophobic nanocomposites that are highly adhesive to substrates is a major challenge in surface-related technologies. In this study, litchi-like polystyrene (PS) particles were prepared by soap-free emulsion polymerization with styrene (St) as monomer , KH-570 as crosslinking agent and KPS as initiator. Dual-sized litchi-like 1H,1H,2H,2H-perfluorodecyltriethoxy silane-SiO 2 -PS (PFDTES-SiO 2 -PS) particles was sol–gel synthesized using TEOS, PS, and PFDTES. Special superhydrophobic , highly oleophobic, and highly adhesive FDA-SiO 2 -PS (fluoride hdroxyl acrylate-resin-SiO 2 -PS copolymer) coatings were fabricated by embedding fluorosilane-modified litchi-like SiO 2 particles in fluoride hdroxyl acrylate-resin (FHA resin) followed by curing through cross-linking using free radical polymerization . The structure, surface morphology , and properties of the coatings were examined by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle measurements, and chemical analysis. The measured Ra roughness value was 181 nm for FDA-SiO 2 -PS coating. The fluorine-containing groups have a strong tendency to direct themselves to the coating surface , resulting in a superhydrophobic and highly oleophobic coating (water and CH 2 I 2 contact angles of 169.61° and 137.04°, respectively, and a water rolling angle of 4.35°) that is also highly adhesive to substrates (adhesion 5B). Exposing to air for 24 months, the coating possessed long air-stability with contact angles of 159.31° and 135.04° for water and CH 2 I 2 , independently. Furthermore, the FDA-SiO 2 -PS coating endows it with excellent antifouling and self-cleaning abilities, and resistance to E. coli and platelet adhesion; hence, FDA-SiO 2 -PS is a promising coating for use in biomedical and marine antifouling applications.
研究领域:
材料科学
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表面工程
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生物医学应用
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Mengran Liu,Weiting Jiang,Xiaohui Jiang,Liangmin Yu
The reasonable design of multiple interfaces and heteroatom doping can substantially improve the wave-absorbing performance of electromagnetic wave (EMW) absorbing materials. As the carbon source of biomass, the carbon material with abundant oxygen-containing groups on the surface can be obtained by hydrothermal method , which is conducive to modification and design of the morphology. In addition, N -hydroxymethyl acrylamide contains rich N atoms and has good water solubility, which can be well combined with sugar to prepare high-performance wave-absorbing materials. In this study, D-xylose and glucose were used as carbon sources, water was used as solvent, N -hydroxymethyl acrylamide was added, and nitrogen-doped lychee-like saccharide-based carbon microspheres (LSCMs) were obtained by hydrothermal synthesis and high-temperature carbonization . LSCMs-2 with good EMW attenuation capability and impedance matching performance was obtained by controlling the proportion of different raw materials. Under the optimal filling conditions, the EMW absorber is only 2 mm thick and achieves a minimum reflection loss (RL min ) of −47.44 dB at 13.84 GHz with an effective absorption bandwidth (EAB) of 12.24–17.36 GHz (5.12 GHz). The excellent EMW attenuation performance is mainly attributed to dipole polarization and interface polarization in the LSCMs. This research offers a new green synthesis route for the preparation of EMW absorbers with wider bandwidth, thinner thickness and better absorption performance .
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
COMBUSTION AND FLAME
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2023
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IF 4.4
Yongjin Chen,Hui Ren,Xinzhou Wu,Haoyue Xin,Qingjie Jiao
To design and prepare multifunctional metastable intermixed composites (MICs) with excellent properties, the enhanced “litchi-like” core-shell structure Al/Ti/CuO MICs were prepared by high-energy ball milling (Al/Ti/CuO-B). The morphology, structure, composition, thermal reactivity, energy release and combustion performance of the prepared MICs were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and synchronous thermal analysis (DSC-TG), closed system constant volume combustion experiment, open system CO 2 laser ignition experiment and high-energy laser-induced ablation experiment. This study reveals that, the obtained Al/Ti/CuO-B composites have a “litchi-like” core-shell structure, the components are evenly distributed and closely contacted. The exothermic reaction of Al/Ti/CuO-B should be divided into two stages. Due to the introduction of Ti and the special structure of litchi, Al/Ti/CuO-B has superior reactivity ( E a =178.15 kJ/mol), energy release ( Q = 6443 J/g, P max =164.90KPa), shock wave propagation ( v = 1028.33 m/s) and combustion performance than Al/Ti/CuO-P (simple physical mixing). The thrown Al/Ti/CuO composite particles will undergo secondary micro-reactions during the combustion, and a continuous multi-point “micro-explosion” phenomenon will occur, then self-sustainable combustion can be achieved through multi-level energy superposition release, which will enhance its reaction, combustion and energy release. Al/Ti/CuO-B undergoes an ultrafast reaction to generate plasma under high-energy laser induction, which expands and pushes the surrounding air to form a shock wave. The application of Al/Ti/CuO-B shows that the density, heat of detonation, shock wave overpressure, fireball diameter and temperature of composite structural explosive charge containing Al/Ti/CuO ring are all significantly improved.
研究领域:
材料科学
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热力学
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化学工程
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Xinhui Shu,Ping Guo,Gan Zhang,Wei Zhang,Hong Hu,Juan Peng,Yonghua Xiong,Bingfeng Ma,Weihua Lai
Pyrimethanil (PYR) is a fungicide that is harmful to consumers when present in foods at concentrations greater than maximum permitted residue levels. High-performance immunoprobes and dual-readout strategy may be useful for constructing sensitive lateral flow immunoassay (LFIA). Herein, the prepared litchi-like Au–Ag bimetallic nanospheres (LBNPs) exhibited high mass extinction coefficients and fluorescence quenching constants. Benefiting from LBNPs and dual-readout mode, the limits of detection of LBNPs-CM-LFIA and LBNPs-FQ-LFIA for PYR were 0.957 and 0.713 ng mL −1 , which were 2.54- and 3.41-fold lower than that of gold nanoparticles-based LFIA, respectively. The limits of quantitation of LBNPs-CM-LFIA and LBNPs-FQ-LFIA were 3.740 and 1.672 ng mL −1 , respectively. LBNPs-LFIA was applied to detect PYR in cucumber and grape samples with satisfactory recovery (90%–111%). LBNPs-LFIA showed good agreement with LC-MS/MS for the detection of PYR in the samples. Accordingly, this sensitive and accurate dual-readout LFIA based on LBNPs can be effectively applied for food safety.
研究领域:
食品安全检测
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纳米材料
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分析化学
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产品关联
DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
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2015
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IF 0.357
Chao Tian,Bing Yu,Hua Yuan,Hai-Lin Cong,Xue Lei,Shu-Jing Yang,Cheng-Ling Sun
The composite particles with litchi-like morphologies attributing to the combination of inorganic silica seed and polymer nodules were synthesized successfully using a modified dispersion polymerization method. Dispersion polymerization of styrene was achieved in the presence of silica particles and the formed polystyrene nanoparticles were absorbed onto the surface of silica particles. The effects of the adding amount of St monomer on the particle morphologies was investigated.
研究领域:
材料科学
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化学工程
✓ 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）