COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xiongchao Liu,Xinyu Li,Xifeng Li,Mingli Wang,Yaru Zhang,Na Xie,Yuangang Li,Tifeng Jiao
In this research, Langmuir-Blodgett (LB) composite films were fabricated by integrating phthalocyanine (Pc) with derivatives of perylene diimide (PDI) and naphthalene diimide (NDI). The potential applications of these films in chemical gas sensing and surface-enhanced Raman spectroscopy (SERS) were investigated. The LB technique enables precise regulation of molecular arrangements within films, rendering them highly effective for applications as sensitive sensors. Upon exposure to NH₃ and HCl gases, the composite films exhibited good sensitivity, demonstrating their potential in chemical sensing applications. By employing R6G as a probe molecule, the films demonstrated remarkable SERS performance, distinguished by their uniformity, reproducibility, and amplified signal intensity, achieving an enhancement factor (EF) of 1.76 × 10⁵. This work demonstrates rapid colorimetric response to NH₃/HCl and achieves a high SERS enhancement factor of 1.76 × 10⁵, confirming the significant potential of these LB films for real-world sensing applications.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Fengsheng Li,Tao Hu,Zikang Guo,Chun Huang,Xiangxiang Fan
To enhance the integration of metal oxide semiconductor (MOS) gas sensor array in electronic nose, a sensor array structure based on multiplex sensing electrodes was proposed. Four multiplex sensing electrodes were designed and fabricated on silicon substrate. A heterogeneous sensing material, consisting of SnO 2 thin film and aligned Co 3 O 4 nanofibers, was subsequently prepared on the substrate by magnetron sputtering and electrospinning. By combining different sensing electrodes, the surface-modification-type sensors of SnO 2 @Co 3 O 4 and Co 3 O 4 @SnO 2 and the heterojunction-type sensors of SnO 2 -Co 3 O 4 and Co 3 O 4 -SnO 2 were constructed and formed the gas sensor array. At the operating temperature of 270 °C, the sensors on the array exhibited distinctive responses to ethanol. Co 3 O 4 @SnO 2 exhibited the highest response of 48 to 50 ppm ethanol among all the sensors. Toward the same concentration of ethanol, SnO 2 -Co 3 O 4 and Co 3 O 4 -SnO 2 showed the shortest response time of 1 s, while Co 3 O 4 -SnO 2 additionally presented the shortest recovery time of 34 s. the four sensors also showed different selectivity responses to the gases of ethyl acetate, benzene, methanol and isopropanol. Besides, a hybrid model of CNN-transformer was used to analyze the collected gas response signals of Chinese baijiu with varying concentrations of edible alcohol. With the dataset from the sensor array, the model converged rapidly and achieved a recognition accuracy of 98%. These results confirmed that the sensor array based on multiplex sensing electrodes was an effective design for the integrated gas sensor arrays of electronic noses
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Nature Communications
·
2026
·
IF 18.1
Tian Jinshu,Fang Ling,Ouyang Ni,Xia Liwei,Wang Zhi,Cai Haiting,Feng Qilong,Jiang Xinru,Zhao Jia,Tan Mingwu,Zhang Lili,Wang Yong,Li Xiaonian,Zhu Yihan
The reverse water-gas shift reaction (RWGSR) is essential for converting CO 2 into fuels using renewable hydrogen, but it remains challenged by the difficulty of simultaneously maximizing catalyst activity, selectivity, and stability. These limitations stem from thermodynamic constraints – specifically, the Gibbs-Curie-Wulff theorem - which restricts the synthetic accessibility of high-energy micro-faceted nanocrystals via conventional methods. To address this, we introduce a near-surface “quasi-hyperbaric” ammonia strategy that integrates atmospheric-pressure processing with in-situ ammonia decomposition. This approach enables the controlled synthesis of molybdenum nitride nanocrystals with preferentially exposed high-energy (112) microfacets. These facets promote CO 2 activation through a hydrogen-assisted redox mechanism, driven by geometrically confined and stabilized Mo-N/M-O hybrid active sites. The resulting catalyst outperforms the benchmark Pt/CeO₂, which typically suffers from CO selectivity below 92%. Our catalyst achieves near-equilibrium conversion (56%) at a space velocity (24000 ml/g cat /h), with 100% CO selectivity and outstanding stability (≤ 1% deactivation over 250 hours).
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PubMed
高影响因子
Separations
·
2026
·Vol. 13
·期 1
·
IF 2.7
Ziqi Yang,Jian Li,Shuaiyi Ma,Zhen Wang
Widely used in treating oil mist aerosols generated from metalworking processes, conventional gas–liquid coalescing filters face drawbacks such as increased energy consumption, performance limitations, and shortened service life due to high steady-state pressure drop. To address these issues, this study proposes an innovative design for a filter based on wettability-regulated gradient pore structure. Using glass fiber filter media with different pore size parameters as the substrate and incorporating an intermediate mesh layer, a three-layer filtration structure of “large-pore filtration layer—mesh layer—small-pore filtration layer” was constructed. The surface wettability of each layer was regulated by a self-developed surface modifier, producing gradient pore structure filters with different wettability configurations. The variations in key performance parameters, including steady-state pressure drop, filtration efficiency, saturation, and service life, were systematically evaluated for these configurations. Experimental results demonstrated that the configuration with an “oleophobic large-pore filtration layer—mesh layer—oleophilic small-pore filtration layer” yielded the best overall performance. Analysis based on the “jump-channel” model indicated that the gradient pore structure achieves progressive droplet filtration and optimizes droplet coalescence and capture through wettability differences. Consequently, while maintaining exceptional filtration efficiency (>99%), this configuration significantly reduces the steady-state pressure drop by over 34% and effectively extends the service life by more than 66%. This wettability-regulated gradient pore structure provides a novel technical pathway for addressing the challenges of balancing pressure drop and filtration efficiency, as well as extending the service life, in gas–liquid coalescing filters.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 47
·20561-20571
·
IF 7.139
Tianyu Ai,Jing Li,Shuai Nie,Yansheng Yin,Jinlin Lu,Shuo Bao,Ling Yan
Transition elements doping metal oxide is of great significance for developing gas sensors with high performance. To achieve this goal, α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons are successfully synthesized by a facile N, N-dimethylformamide assisted hydrothermal method and characterized by several physical techniques. The morphology of α-Fe 2 O 3 is evolved by introducing Mn elements. The performance of the α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons as H 2 gas sensors are studied and compared. The Mn/α-Fe 2 O 3 -5 polyhedrons sensor exhibit the best performance at optimum operating temperature of 300 °C. The response and recovery times are 10 s/24 s for H 2 with a concentration of 200 ppm, which is much faster in contrast to those recently reported H 2 gas sensors. Furthermore, α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons show abnormal n-p transition sensing behavior with the change of operating temperature. This work provides a facile method for synthesizing α-Fe 2 O 3 based sensing materials for various sensors applications.
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FLAVOUR AND FRAGRANCE JOURNAL
·
2019
·Vol. 34
·期 4
·271-279
·
IF 1.377
Zong Tan,Zhixuan Huang,Yue Lv,Yuansong Li,Da Chen
The discrimination of chicken spoilage is extremely important in order to guarantee the quality and safety of chicken before consumption, and requires an efficient and reliable method. We aimed to find a rapid and accurate method to discriminate the level of spoilage of chicken, and have developed a gas Fourier transform infrared spectroscopy (G-FTIR) methodology based on analysing volatiles from chicken samples. In this method, the volatiles of chicken samples were first measured by the G-FTIR spectrometer. After that, a chemometrics method combining principal component analysis (PCA) with support vector machine (SVM) was developed to encode the G-FTIR spectra. With the combination of G-FTIR spectra and the chemometrics method, a relationship between the spoilage levels of chicken and the G-FTIR spectra of volatiles was established. As a result, the spoilage levels of chicken samples were accurately distinguished with a prediction accuracy of 100%, for samples stored at both normal (20 °C) and cold (4 °C) temperatures. The results obtained were correlated with the routine total volatile basis nitrogen (TVB-N) method for validation. In addition, The G-FTIR detection process for each sample could be performed within 3 min, requiring no chemical reagents. The G-FTIR methodology performed well for the rapid discrimination of chicken spoilage, which could also be extended to the detection of other spoiled foods.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2018
·
IF 2.207
Hongyu Shi,Na Li,Zhixia Sun,Tianqi Wang,Lin Xu
TiO 2 nanoparticles are commonly used as versatile precursors to make functional nanocomposite materials. However, the surface defects at grain boundaries of TiO 2 nanoparticles significantly affect the photoelectric properties of TiO 2 nanomaterials . In this work, we firstly prepared nanocomposites of TiO 2 and polyoxometalates (POMs) in which different POMs, including titanium-substituted POMs K 5 [PW 11 TiO 40 ] and K 7 [PW 10 Ti 2 O 40 ], are incorporated with TiO 2 nanoparticles so as to make an interface modification on grain boundaries of TiO 2 nanoparticles. Then the photoconductivities of the TiO 2 /POM nanocomposites were investigated through measurement of photocurrent responses, current-voltage curves, Mott-Schottky plots and surface photocurrent spectra. Compared with pure TiO 2 nanoparticles, TiO 2 /POM nanocomposites exhibit superior photoelectric properties, benefitting from the interface modification from different POMs. The gas sensing performance for acetone was also explored by use of the as-prepared photoconductive devices, and TiO 2 /PW 11 Ti exhibited a high gas sensing performance.
研究领域:
材料科学
·
纳米科技
·
半导体物理
·
传感器技术
·
光电子学
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105785
·
IF 5.909
Jinjia Guo,Yongmei Wang,Zhao Luo,Feng Zhang,Dewang Yang
Carbon cycle in coastal water is a significant dynamic component of global carbon budget , however, the diverse sources, carbon sinks and their complex interactions remained poorly understood. In order to detect the dissolved inorganic carbon (DIC) and their interactions, gas-liquid Raman spectroscopy was built and applied to simultaneously detect the constituents of air, dissolved CO 2 , HCO 3 - and chlorophyll in coastal water. The linear fitting curve between peak intensity and concentration was built for the quantitative analysis of HCO 3 - and CO 2 , meanwhile, the fluorescence peaks of chlorophyll at 679 nm were detected for the qualitative analysis. For the multi-components analysis, typical Raman spectra of the constituents of air, dissolved CO 2 , HCO 3 - in seawater, and the fluorescence spectra of chlorophyll in seawater were detected. Results showed that the time dependent change of CO 2 and O 2 in the air exhibited a contrary tendency, while that of dissolved CO 2 and O 2 was curved like a cosine. The changing tendency of relative concentrations of dissolved CO 2 was about 2 h earlier than CO 2 in air, due to the life activity of microorganisms driving the gas exchange at the air-sea interface. Furthermore, the study makes a study on the relationship between DIC and chlorophyll based on the detection of HCO 3 - and chlorophyll in coastal water, indicating that this gas-liquid Raman spectroscopy could successfully provide real-time analysis of multicomponent DIC in the air-sea exchanging process.
研究领域:
海洋化学
·
环境光谱学
·
碳循环
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分析化学
·
生物地球化学
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhongming Wang,Kun Wang,Xiaoying Peng,Qiang Geng,Xun Chen,Wenxin Dai,Xianzhi Fu,Xuxu Wang
The photoconductivity and the gas sensing property of TiO 2 at room temperature under ultraviolet (UV) irradiation were compared with those under visible light irradiation (≥420 nm), respectively. It was found that UV light could cause the photoconductivity of TiO 2 and its sensing response to both ethylene and oxygen, while the visible light at 420 nm could cause the photoconductivity of TiO 2 and its sensing response to oxygen but not to ethylene. This indicates that the photo-assisted gas sensing performance of TiO 2 was dependent on its light-excited behavior: The intrinsic excitation of TiO 2 induced by UV light could produce both the holes and electrons, which exhibited a respective response to ethylene and oxygen, while the extrinsic excitation of TiO 2 induced by visible light maybe only produced the free electrons but not free holes, resulting in only a response to oxygen. Furthermore, it was found that the visible-light enhanced conductivity maybe depend on the Ti–bonded hydroxyls (Ti–OH) at TiO 2 surface. With the removal of Ti–OH by increasing temperature, the visible light could not produce the photoconductivity of TiO 2 . It was proposed that Ti–OH groups act as the shallow trapped level to cause the extrinsic excitation of TiO 2 .
研究领域:
材料科学
·
半导体物理
·
传感器技术
·
光化学
·
表面科学
·
纳米材料
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高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Daren Fu,Biao Wang,Shixin Mao,Jiayu Zou,Changrui Deng,Siyan Liu,Zhi Li,Bei Liu,Qiang Wei,Guangjin Chen,Xuqiang Guo
During the transportation of oil and gas, the coexistence of wax crystals and natural gas hydrates is becoming an increasingly prominent problem. The deposition of these solids is likely to result in the pipeline blockage, which adversely affects the flow efficiency and safety of oil and gas. To address this issue, researchers have proposed jointly adding wax inhibitors and hydrate inhibitors to improve flow assurance. However, due to the significant differences in the mechanisms of various inhibitors, the interaction effects among wax inhibitors, hydrate inhibitors, wax crystals, and hydrates may potentially undermine the inhibitory efficacy. To better clarify this issue, this paper first provides a detailed elaboration on the types, mechanisms, and interaction relationships of various inhibitors, including kinetic inhibitors of gas hydrates, thermodynamic inhibitors of gas hydrates, antiagglomerates, wax dispersants, and pour point depressants. Subsequently, based on previous studies, the interaction process of hydrate inhibitors, wax inhibitors, hydrates, and wax crystals in waxy oil–gas–water multiphase systems is reviewed. Finally, this paper puts forward possible interaction mechanisms between wax inhibitors and hydrate inhibitors, providing useful references for researchers in this field.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yinfen Cheng,Junfeng Du,Nianzhong Ma,Zhong Li,Xinyi Hu,Lieqi Liu,Zhentao Ji,Jian Zhen Ou
The hazards to the ecological environment and human health promote the development of NO 2 monitoring sensors. However, the high operating temperature of traditional metal oxide sensitive materials limits the application of gas sensor-based systems in low power monitoring. Here, we utilize oxygen vacancy enriched 2D MoO 3-x , enabling the high performance optoelectronic NO 2 gas sensing at room temperature. The introduction of oxygen vacancies in MoO 3-x results in the red-shift light absorption from purple light to cyan light and high surface activity with negative potential, thus promoting its application in optoelectronic room temperature gas sensing. Under 365 nm UV light irradiation, oxygen vacancy enriched 2D MoO 3-x based gas sensor shows a good room temperature reversible response towards different concentrations of NO 2 , in which a response factor of 6.46 is achieved towards 10 ppm NO 2 . Moreover, excellent repeatability in six continuous tests, selectivity towards five common gases, and long-term stability for four months were also demonstrated in this sensor. This work provides an effective approach for tuning the electronic structure and surface activity of metal oxide, and demonstrates the application feasibility of oxygen vacancy enriched metal oxide in high optoelectronic gas sensing.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Jiawei Han,Peng Lv,Xudong Song,Juntao Wei,Yonghui Bai,Jiaofei Wang,Weiguang Su,Guangsuo Yu
Utilizing carbon-neutral biomass reduces reliance on fossil fuels and lowers carbon emissions. Although thermochemical conversion is efficient, it consumes feedstock for heat, reducing biomass conversion efficiency. Molten salts can enhance reactions and store solar energy; consequently, the coupling of solar energy with molten-salt-assisted biomass thermochemical conversion has attracted significant attention. This study evaluated bio-oil and gas production characteristics from biomass, cellulose, and lignin via conventional and catalytic pyrolysis (the latter using ZnCl 2 , CaCl 2 , and NiCl 2 ) in molten salts. Analysis of the pyrolysis gases and bio-oil revealed the effects of molten salts and catalysts on product generation from biomass, cellulose, and lignin, and suggested potential reaction mechanisms. Results show molten salts and catalysts boost hydrogen intensity: conventional pyrolysis of biomass in molten salts raises it by up to 62.50%, and catalytic pyrolysis by up to 172.67%. Molten salts and catalysts also reduce bio-oil peak area. Catalysts promote deep decomposition, reducing oxygen-containing compounds in detectable volatile compounds. Ni catalysts promote dehydration-condensation, consuming the most water but producing the least H 2 . Zn catalysts promote dehydration, dehydrogenation, and in-situ water reforming, greatly reducing bio-oil oxygenates; and polycondensation releases large-scale H 2 . Ca catalysts show pronounced decarboxylation and dehydrogenation, with feedstock-dependent performance.
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