SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Haibo Ren,Cuiping Gu,Sang Woo Joo,Jingjuan Zhao,Yufeng Sun,Jiarui Huang
A NiO@rGO nanocomposite is prepared by a freeze-drying method combined with heat treatment. The morphology and structure are analyzed through X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectra, and X-ray photoelectron spectroscopy. The results clearly show that NiO nanoparticles are uniformly anchored on the surface of the rGO nanosheet. The gas-sensing performance of the nanocomposite is also investigated to detect hydrogen. The NiO@rGO sensor exhibits good gas-sensing performance with high sensitivity, fast response, good reversibility, and selectivity toward hydrogen. The relative response of the sensor to 1% hydrogen is 0.64, the response time is 28 s, and the recovery time is 142 s. The improved sensing performance is due to the effective electron transfer between the NiO nanoparticles and rGO nanosheet.
研究领域:
材料科学
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传感器技术
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Nature Communications
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2018
·Vol. 9
·期 1
·1-7
·
IF 12.353
Ding Li,Wei Yanying,Li Libo,Zhang Tao,Wang Haihui,Xue Jian,Ding Liang-Xin,Wang Suqing,Caro Jürgen,Gogotsi Yury
Molecular sieving membranes with sufficient and uniform nanochannels that break the permeability-selectivity trade-off are desirable for energy-efficient gas separation, and the arising two-dimensional (2D) materials provide new routes for membrane development. However, for 2D lamellar membranes, disordered interlayer nanochannels for mass transport are usually formed between randomly stacked neighboring nanosheets, which is obstructive for highly efficient separation. Therefore, manufacturing lamellar membranes with highly ordered nanochannel structures for fast and precise molecular sieving is still challenging. Here, we report on lamellar stacked MXene membranes with aligned and regular subnanometer channels, taking advantage of the abundant surface-terminating groups on the MXene nanosheets, which exhibit excellent gas separation performance with H 2 permeability >2200 Barrer and H 2 /CO 2 selectivity >160, superior to the state-of-the-art membranes. The results of molecular dynamics simulations quantitatively support the experiments, confirming the subnanometer interlayer spacing between the neighboring MXene nanosheets as molecular sieving channels for gas separation.
研究领域:
材料科学
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化学工程
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纳米技术
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PubMed
高影响因子
ANALYTICAL CHEMISTRY
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2013
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IF 5.695
Ruixue Wang,Geli Li,Yongqiang Dong,Yuwu Chi,Guonan Chen
Silica aerogels functionalized with strongly fluorescent carbon quantum dots were first prepared and used for simple, sensitive, and selective sensing of NO2 gas. In the presence of ethanol, homemade silica aerogels with a large specific surface area of 801.17 m2/g were functionalized with branched polyethylenimine-capped quantum dots (BPEI-CQDs) with fluorescence quantum yield higher than 40%. The prepared porous CQD-aerogel hybrid material could maintain its excellent fluorescence (FL) activity in its solid state. The FL of CQD-aerogel hybrid material could be selectively and sensitively quenched by NO2 gas, suggesting a promising application of the new FL-functionalized aerogels in gas sensing.
研究领域:
材料科学
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环境科学
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化学
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高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Zhihao Zhao,Chao Ma,Lingyun Xu,Zhenwei Yu,Dong Wang,Lei Jiang,Xiangyu Jiang,Guangcheng Gao
Polyaniline-based conductive polymers are promising electrochemical sensor materials due to their unique physical and chemical properties, such as good gas absorption, low dielectric loss, and chemical and thermal stabilities. The sensing performance is highly dependent on the structure and dimensions of the polyaniline-based conductive polymers. Although in situ oxidative polymerization combined with the self-assembly process has become one of the main processes for the preparation of flexible polyaniline-based gas sensors, how to prepare polyaniline materials into uniformly arranged microwire arrays is still an urgent problem. In this paper, an in-depth study was conducted on the preparation of polyaniline microwire arrays by combining a wettability interface dewetting process and a liquid-film-induced capillary bridges method. The factors influencing the preparation of polyaniline microwire arrays, including solution concentration, template width, evaporation temperature, and evaporation time, were investigated in detail. The wire formation rates were recorded from the results of SEM images. 100% microwires formation rate can be obtained by using a 1.0 mg mL–1 concentration of polyaniline solution and a 10 μm silicon template at an evaporation temperature of 80 °C for 18 h. The prepared microwire arrays can realize sulfur dioxide sensing at room temperature with a response speed of about 20 s and can detect sulfur dioxide gas as low as 1 ppm. Thus, the liquid-film-induced capillary bridge method shows a new possibility to prepare gas sensor devices for insoluble polymers.
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POLYMER ENGINEERING AND SCIENCE
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2023
·Vol. 63
·期 8
·2409-2420
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IF 3.2
Jia Li,Lang Zhou,Shuang Liu
A novel smart material is developed, which is synthesized by succinic anhydride, epoxy resin, and zinc acetylacetone hydrate. The smart material has excellent properties of self-healing, shape memory, and degradation. The experimental results of performance characterization show that the material has good thermal stability. The glass transition temperature is adjustable between 100 and 120°C, and the storage modulus can reach 20 GPa. The maximum thermal expansion at 50°C is less than 15%, the thermal expansion equilibrium time at 120°C is less than 5 min, and the maximum thermal expansion is 131%. The stress relaxation time at 120°C is more than 2 h, which can slowly self-heal on the basis of maintaining the mechanical strength. When the NaOH content is 1.5%, the degradation equilibrium can be reached in about 3 h, and the maximum degradation rate is 86%. The comprehensive performance evaluation shows that after hot rolling at 120°C/16 h, the material has no effect on the rheology and filtration properties. When plugging the fracture width of 5 × 4 mm, the pressure bearing capacity reaches 10 MPa. Its main mechanism is temperature-sensitive expansion, and the stress relaxation effect heals and blocks the micro pore throat.
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Nature Communications
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2023
·Vol. 14
·期 1
·1-9
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IF 16.6
Zhang Hong,Zhang Zuobin,Li Zhou,Han Hongjie,Song Weiguo,Yi Jianxin
Highly efficient gas sensors able to detect and identify hazardous gases are crucial for numerous applications. Array of conventional single-output sensors is currently limited by problems including drift, large size, and high cost. Here, we report a sensor with multiple chemiresistive and potentiometric outputs for discriminative gas detection. Such sensor is applicable to a wide range of semiconducting electrodes and solid electrolytes, which allows to tailor and optimize the sensing pattern by tuning the material combination and conditions. The sensor performance is boosted by equipping a mixed-conducting perovskite electrode with reverse potentiometric polarity. A conceptual sensor with dual sensitive electrodes achieves superior three-dimensional (sub)ppm sensing and discrimination of humidity and seven hazardous gases (2-Ethylhexanol, ethanol, acetone, toluene, ammonia, carbon monoxide, and nitrogen dioxide), and enables accurate and early warning of fire hazards. Our findings offer possibilities to design simple, compact, inexpensive, and highly efficient multivariate gas sensors.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2023
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IF 6
Liu Ren,Wang Jian,Huang chongxing,Su Hongxia,Huang Haohe,Luo Wanru,An Jiejie,Zhao Hui,Xu Yangfan,Wang Shuangfei
The polymeric wall material of microcapsules has the function of encapsulation, protection, and controlled release of the active core material. In this study, sodium alginate (SA)-NaClO 2 solution was encapsulated in ethylcellulose (EC) microcapsules using an emulsion-solvent evaporation method. The EC/SA-NaClO 2 microcapsules were doped into polyvinyl alcohol (PVA) solution containing HCl, and an antimicrobial film was prepared using the solution casting method. Water vapor drives HCl into the interior of the microcapsules and reacts with NaClO 2 in the microcapsules to release ClO 2 gas to achieve antimicrobial properties. ClO 2 gas can effectively inhibit the growth and reproduction of bacteria and molds on strawberry surfaces. The antimicrobial film inhibited the growth of E. coli by 99.9% and reduced the area of B. cinerea to <10%. Storage bags prepared from antimicrobial films could extend the shelf life of strawberries and maintain their sensory characteristics such as color, hardness, and moisture.
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JOURNAL OF CHROMATOGRAPHY A
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2020
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IF 4.049
Sha-Sha Meng,Ze-Rong Tao,Wen-Qi Tang,Ting Han,Yan Du,Zhi-Yuan Gu
ABSTRACT Fine-tuning of the SiF 6 2− -containing metal-organic frameworks (SIFSIX) through the substitution of metal centers and ligands changed the apertures from 8.3 Å to 3.8 Å, resulting in ultramicropores and notably improving the separation performance of alkane isomers. Herein, we reported SIFSIX-1-Zn, SIFSIX-1-Cu and SIFSIX-3-Zn as representative stationary phases for capillary gas chromatography (GC). The capillary column coated with ultramicroporous SIFSIX-3-Zn efficiently separated the alkane isomers and benzene homologues, which outperformed SIFSIX-1-Zn and SIFSIX-1-Cu. This resulted from size matching between the window of the ultramicroporous SIFSIX-3-Zn and the analytes, which was also supported by McReynolds constants, column efficiency and peak tailing effect. It opened up a new avenue for ultramicroporous materials in the chromatography separation of isomers.
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JOURNAL OF POLYMER RESEARCH
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2022
·Vol. 30
·期 1
·1-10
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IF 3.061
Huo Yanqiu,Lin Changhong,Ge Huan,Ying Puyou,Huang Min,Zhang Ping,Yang Tao,Wang Tianle,Wu Jianbo,Yan Yusi,Levchenko Vladimir
In this work, the Polyurethane/MoS 2 composites (PUM) filled with different amount of modified molybdenum disulfide (MoS 2 ) were prepared by solution-blending-casting method. The thermal reversible Diels–Alder (DA) bonds enabled the polymer system recyclable ability. The modified MoS 2 were obtained by tannic acid (TA) assistant ultra-sonication exfoliation method were used to improve the gas barrier performance of materials. Compared with the pure PU, about twofold decrease in oxygen gas permeability of PUM composites (from 6719 to 3927 cm 3 /m 2 ˙d˙Pa) were obtained with 1 wt% MoS 2 . More important, the samples showed excellent gas barrier and mechanical properties before and after being hygrothermal aged for 100 h. The PUM composites had good gas barrier and recyclability and had great potential application prospects in packing materials.
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APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Jingzhi Hou,Hongyan Zhang,Chu Chen,Chen Yang,Haiyang Zhang,Zhipeng Li
In this study, a high-performance ammonia (NH 3 ) gas sensor based on a CeO 2 /CdS heterojunction with increased surface defects was prepared using the hydrothermal method. First-principles calculations based on density functional theory (DFT) were employed to elucidate the sensing mechanism. Experimental results indicate that more surface defects and surface hydroxyl groups can effectively enhance the performance of the CeO 2 /CdS NH 3 gas sensor at room temperature. The response value of CeO 2 /CdS is 739.5 at a concentration of 500 ppm NH 3 , and the response/recovery time at 50 ppm is 1.27 s/1.63 s, which is faster compared with the previously reported NH 3 gas sensors based on CeO 2 . Theoretical calculations suggest that the presence of more oxygen vacancies or sulfur vacancies on the surface of CeO 2 or CdS can lead to the generation of additional d electrons and the capture of more NH 3 molecules. Furthermore, it was discovered for the first time that the d-band center of CeO 2 could shift upward under more surface oxygen vacancies and hydroxyl groups, which can improve the chemical activity of the CeO 2 /CdS and enhance its adsorption capacity for NH 3 molecules. This research constructed CeO 2 /CdS with multiple surface defects through a heterogeneous structure, providing new ideas for developing high-performance NH 3 gas sensors.
研究领域:
材料科学
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传感器技术
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表面化学
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纳米材料
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气体传感
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高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Jian Hu,Xueyan Yun,Yan Zheng,Tao Sun,Lijun Song,Pengju Pan,Tungalag Dong
High costs and low performance have constrained the application of bio-based materials in food packaging. Herein, a series of ultra-thin poly(L-lactic acid-iconic acid N-diol) (P(LA-NI)) copolymer films were developed using a “one-step” polycondensation process with integrated toughness, barrier properties, gas selectivity, and quality control features. The massive branched structure and gg conformers in P(LA-NI) act as “internal chain expansion” and “internal plasticization”. Meanwhile, P(LA-NI) contains numerous polar groups and unique nanoscale microphase structures to realize excellent CO 2 , O 2 barrier, CO 2 /O 2 selectivity, anti-fogging, and UV shielding functions. The atmosphere within the package spontaneously achieves the desirable low O 2 and high CO 2 levels when packaging button mushrooms with high respiratory metabolism. Eventually, the shelf life of button mushrooms reached 24 days, >3-fold extended. This PLLA-based film meets “dual carbon” and “food safety” goals and has vast potential for fresh food preservation.
研究领域:
食品科学
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材料科学
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生物工程
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高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2024
·Vol. 105
·期 1
·579-590
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IF 3.3
Aliya,Yufa Cao,Danni Zhang,Shi Liu,Shui Jiang,Yuan Liu
BACKGROUND Baijiu is a traditional Chinese liquor produced from grains through fermentation, distillation, aging and blending. The flavor of Baijiu is influenced by factors such as raw materials, starter, processes and the environment, and since the relationship between these factors and the flavor of Baijiu is still being analyzed, the identification of different Baijiu is still somewhat difficult. In this paper, the volatile differential markers of 42 types of strong-aroma Baijiu of different origin, alcohol content and grade were explored. RESULTS A total of 24 volatile substances were detected by gas chromatography–electronic nose (GC-E-Nose) and 99 volatile substances were detected by gas chromatography–time-of-flight mass spectrometry (GC-TOF MS). The peak areas of the substances obtained by GC-E-Nose were analyzed by the partial least squares (PLS) method, and the substances with variable importance in projection (VIP) >1 were screened out. Combined with the qualitative results of GC-TOF MS, four substances (isobutyric acid, 2-butanone, 2,3-butanediol and 3-methylbutyric acid) were selected as volatile differential markers for strong-aroma Baijiu. An external standard curve was established to accurately quantify these four substances, and the Kruskal–Wallis test confirmed that the absolute contents of these four substances varied significantly among different samples ( P < 0.01). Principal component analysis and hierarchical cluster analysis based on the absolute content of these four substances showed that different samples were prioritized for different alcohol contents. CONCLUSION These four substances can be used as volatile differential markers of strong-aroma Baijiu samples. This research provides theoretical support for the detection and improvement of Baijiu product quality. © 2024 Society of Chemical Industry.
研究领域:
食品科学
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分析化学
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高影响因子
危险品化学品经营许可证（带存储）