APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yanping Zhao,Xuxia Shai,Qihang Zhou,Kaiyuan Shen
Developing exhaled acetone sensors with high performance can be effectively applied to the medical diagnosis and the health monitoring. Herein, a two-dimensional (2D) layered graphitic carbon nitride (g-C 3 N 4 ) with tunable electronic structure, abundant edge sites, and high stability is proposed, and it is further coupled with stannic oxide (SnO 2 ) by one-step hydrothermal approach to construct a Mott-Schottky heterostructure with layered nanorods array. The exceptional response of the as-fabricated g-C 3 N 4 /SnO 2 gas sensor to 50 ppm acetone at 100 °C is four times higher than that of the pristine SnO 2 sensor. Additionally, the g-C 3 N 4 /SnO 2 sensor's remarkable selectivity, long-term stability against acetone gas, and detection limit of 250 ppb are exhibited. The unique hierarchical design and the Mott-Schottky heterostructure creation which validated by electrochemical study, may be in charge of the enhanced acetone sensing capabilities of g-C 3 N 4 /SnO 2 gas sensor. This work will provide a concise and effective avenue to construct hierarchical composite with Mott-Schottky heterostructure for high-performance acetone gas sensor.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Ziwen Yao,Jing Li,Shuai Nie,Yuan Wang,Xitao Yin,Yunxia He
Utilizing p-n composite materials for the fabrication of metal-oxide semiconductor (MOS) gas sensors represents a promising strategy to achieve exceptional selectivity in detecting reducing gases such as hydrogen (H₂) and carbon monoxide (CO). However, previous studies have typically achieved this selectivity under fixed operating temperatures and single molar ratios. This study presents the successful synthesis of n-In₂O₃/p-Co₃O₄ nanoparticles, featuring a p-n heterojunction structure, using a simple composite preparation method. The gas-sensing properties, crystal structure, morphology, and chemical states were comprehensively characterized using an electrochemical workstation, XRD, TEM, HRTEM, and XPS. Experimental results show that the gas sensor responses of the n-In₂O₃/p-xCo₃O₄ composites (with x = 10.5, 15, 18, 21), annealed at 500°C within an operational temperature range of 350°C to 400°C, exhibit distinct behaviors for CO and H₂ gases. This addresses the challenge of achieving selective detection across varying conditions. Notably, the n-In₂O₃/p-18Co₃O₄ composites display opposing response characteristics for both gases across a broad temperature range of 200°C to 400°C. At 350°C, the n-In₂O₃/p-18Co₃O₄ sensor demonstrates optimal selectivity, significantly minimizing cross-sensitivity and improving detection accuracy and reliability. The sensor also shows excellent stability, with consistent responses under repetitive exposure conditions. By improving both sensor selectivity and stability, this research advances gas detection technologies, with potential applications in sustainable energy and public health monitoring.
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Nanomaterials
·
2025
·Vol. 15
·期 16
·1232
·
IF 4.3
Yelin Qi,Ting Liang,Wen Yang,Tengbo Ma,Siyue Zhao,Yadong Liu
The poor selectivity of metal oxide semiconductor sensors is a major constraint to their application in the detection of chemical warfare agents. We prepared a (Pt+Pd+Rh)@Al2O3/(Pt+Rh)-WO3sensor by using (Pt+Pd+Rh)@Al2O3as a catalytic film material and (Pt+Rh)-WO3as a gas-sensitive film material. Using temperature dynamic modulation, the (Pt+Pd+Rh)@Al2O3/(Pt+Rh)-WO3sensor was realised to improve the selectivity for mustard. Due to the catalytic effect of the (Pt+Pd+Rh)@Al2O3catalytic film on mustard, mustard was able to be catalytically generated into mustard sulphoxide after passing through the (Pt+Pd+Rh)@Al2O3catalytic film. Under a certain temperature dynamic modulation, the mustard concentration on the surface of the (Pt+Rh)-WO3gas-sensitive film showed an increase and then a decrease. Since the resistance response of the (Pt+Rh)-WO3gas-sensitive film to mustard was much higher than that of mustard sulphoxide, the change in the resistance of the (Pt+Rh)-WO3gas-sensitive film was mainly determined by the change in the concentration of mustard, which led to the peak signal in the curve of its resistance response to mustard. The experimental results showed that the (Pt+Pd+Rh)@Al2O3/(Pt+Rh)-WO3sensor had peak signals in the resistance response to mustard only, and not in the resistance response to 12 interfering gases, such as carbon monoxide.
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PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Na Chang,Xiu-Ping Yan
Metal-organic frameworks (MOFs) which offer a variety of topologies, porous networks and high surface areas are promising and have potential for the applications of specific adsorption, isomerization, catalysis and separation. UIO-66 is the first MOF that has been observed to have reverse shape selectivity. However, such reverse shape selectivity of MOFs has never been explored for capillary gas chromatographic separation. Here we report the fabrication of MOF UIO-66 coated capillary column and exploration of the reverse shape selectivity and molecular sieving effect of such column for capillary gas chromatographic separation of alkane isomers and benzene homologues with excellent selectivity and precision. The adsorption enthalpies and entropies on the interaction between hydrocarbons and UIO-66 were measured to illustrate the energy effect on the separation of alkane isomers and benzene homologues on the UIO-66 coated capillary column. UIO-66 coated capillary column gave preferential retention of branched alkane isomers over their linear isomer, showing reverse shape selectivity, making UIO-66 coated capillary column attractive for capillary gas chromatographic separation of alkane isomers. iso -Propylbenzene (branched) eluted after n -propylbenzene on the UIO-66 coated capillary column again shows reverse shape selectivity. However, much bulkier 1,3,5-trimethylbenzene eluted earlier than n -propylbenzene and iso -propylbenzene on the UIO-66 coated capillary column, exhibiting molecular sieving effect. The combination of reverse shape selectivity with molecular sieving effect makes the UIO-66 coated capillary column promising for the separation of structural isomers.
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DOI
PubMed
高影响因子
Separations
·
2025
·Vol. 12
·期 11
·304
·
IF 2.7
Wenhui Xu,Lu Wang,Mengjia Ji,Zigang Tang,Jing Liu,Hangzhen Lan,Xingtao Zhang
This study aimed to achieve efficient capture of phthalate esters (PAEs) and bisphenol A (BPA) from pear samples collected in the northern Anhui Province. A novel polystyrene–pyridine (PS/PD) composite nanofiber membrane was fabricated via electrospinning and employed as a filter in the sampling process. Following sample collection, PAEs and BPA were extracted with acetonitrile (ACN). Then, 100 μL of the extract was further concentrated using packed-fiber solid-phase extraction (PFSPE), with PS/PD nanofibers as the sorbent, and subsequently analyzed by gas chromatography–mass spectrometry (GC-MS). Under the optimized procedure, satisfactory recoveries of 87.0–109.9% were obtained for pear samples, with relative standard deviations (RSDs) ranging from 0.6% to 11.9%. Limits of detection (LOD) and limits of quantification (LOQ) were 0.03–0.10 μg/L and 0.034–0.34 μg/L, respectively. Analysis of pear samples from local markets and the native region was performed, and the detected concentrations of five PAEs and BPA ranged from 0.037 to 0.079 μg/L. Matrix effects were also evaluated. These findings demonstrate that the developed packed-nanofiber solid-phase extraction (PFSPE)-GC-MS method is reliable and effective for the determination of PAEs and BPA in pear samples.
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Materials Research Express
·
2025
·
IF 2.2
Suyang Lu,Jie Su,Haoran Zhan,Jintai Li,Jiaqing Li,Xulin Yang,Zhoukun He,Xiaorong Lan,Wei Feng
Polystyrene (PS), known for its low cost, excellent chemical stability, and optical transparency, has been widely used in various applications including electronic equipment packaging, pharmaceuticals, and food packaging. Although PS demonstrates some hydrogen permeability, its inherent oxygen and water vapor barrier properties require substantial improvement to meet advanced industrial standards. Reduced graphene oxide (rGO) has been extensively employed to enhance the oxygen and water vapor barrier performance of polymer materials. In this study, PS was selected to investigate the relationship between the optimal rGO loading and the oxygen/water vapor barrier properties as well as hydrogen permeability, aiming to achieve unique selective gas barrier characteristics. The water vapor transmission rate decreased significantly from 1.27 g/(m2·day) for pure PS to 0.48 g/(m2·day) for the 1% rGO-PS composite (1%GPS), demonstrating a remarkable improvement in water vapor barrier performance. Similarly, the incorporation of rGO nanofillers enhanced the oxygen barrier properties of PS, reducing the oxygen transmission rate from 4586.11 g/(m2·day) for pure PS to 138.32 g/(m2·day) for 1%GPS. Furthermore, the hydrogen transmission rates (HTR) of pure PS and 1%GPS were 907 cm2/(m2·day·0.1 MPa) and 912 cm2/(m2·day·0.1 MPa), respectively, indicating only a marginal increase in HTR. Consequently, the 1%GPS composite exhibits optimal barrier selectivity, combining superior water vapor barrier properties, oxygen barrier properties, and hydrogen permeability.
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高影响因子
QUIMICA NOVA
·
2025
·
IF 0.7
Yan Li,Yu Baolu,Pan Yuewen,Li Xuezhi,Lou Zeyang,Tian Hongliang
Polymer-based fracturing fluids are widely used in unconventional reservoirs but often fall short in complex conditions. This study synthesizes a novel hydrophobic association water-soluble polymer (PAMNC12) and explores its synergy with viscoelastic surfactants (VESs: oleic acid amide propyl trimethylammonium chloride (OTAC), oleic acid amide propyl sulfobetaine (ODSB), oleic acid amide propyl carboxyl betaine (ODCB)) to optimize fracturing fluid performance. PAMNC12 exhibits critical association concentrations at 1029.2 and 2513.2 mg L-1. Rheological, gel-breaking, and core damage tests reveal that VES-PAMNC12 synergy significantly enhances apparent viscosity, viscoelasticity, drag reduction, heat/shear resistance, and proppant-carrying capacity while reducing residue content and core damage. Optimal dosages are 400 mg L-1 VES and 10,000 mg L-1 KCl. Among the systems, PAMNC12/OTAC shows superior thickening, heat/shear resistance (160 °C), drag reduction (lowest settlement velocity), and minimal residue (30 mg L-1) and core damage (10.1%). PAMNC12/ODSB and PAMNC12/ODCB also demonstrate excellent heat tolerance, sand-carrying, drag reduction, and low formation damage, making them promising for hydraulic fracturing in unconventional reservoirs. This study provides a foundation for developing high-performance fracturing fluids.
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高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 13
·3276-3282
·
IF 5.256
Yang Ding,Jie Liu,Yan Zhu,Siyang Nie,Junli Shi,Weili Wang,Junhan Hou,Xibin Yu
Cadmium based chalcogenides (CdS, CdSe, CdTe) quantum dots exhibited ultrahigh photoluminescence (PL), quantum yields (QYs) and multicolor luminescence. However, the usual synthesis needs high temperature, inert gas protection, and localized injection operation, which hinder applications seriously. Here, we synthesized CdS QDs and a series of metal-ions-doped QDs using low temperature synthesis (30–80 °C). The synthesis was designed according to supersaturated recrystallization. It was operated under air atmosphere, in DMF solution, free from inert gas protection and used non-injection operation. The obtained QDs exhibit strong and stable luminescence. They have a monodisperse, uniform morphology and good crystallinity. With increasing synthesis temperature, the emission center of the CdS QDs shifts from 500 nm to 550 nm. The metal ions doped in the CdS substrate form a deep level. The emission energy decreases and the emission center shifts to longer wavelengths. The emission peaks located at 520 nm, 534 nm, 540 nm, 578 nm and 625 nm correspond to CdS QDs doped with Sn2+, Sb3+, Ni2+, Mn2+ and Cu2+, respectively. The increased synthesis temperature also results in a red shift of the emission peak. The tunable optical properties and the suitability for large scale production endow the metal-ions-doped CdS QDs with promising potential for lighting and displays, which was demonstrated by white light-emitting diodes with a high CRI value, power efficiency and good stability.
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高影响因子
CHEMPHYSCHEM
·
2024
·Vol. 25
·期 14
·e202400151
·
IF 2.3
Chang Yang Wang,Long Zhao,Ralf I. Kaiser
Polycyclic aromatic hydrocarbons (PAHs) imply the missing link between resonantly stabilized free radicals and carbonaceous nanoparticles, commonly referred to as soot particles in combustion systems and interstellar grains in deep space. Whereas gas phase formation pathways to the simplest PAH – naphthalene (C 10 H 8 ) – are beginning to emerge, reaction pathways leading to the synthesis of the 14π Hückel aromatic PAHs anthracene and phenanthrene (C 14 H 10 ) are still incomplete. Here, by utilizing a chemical microreactor in conjunction with vacuum ultraviolet (VUV) photoionization (PI) of the products followed by detection of the ions in a reflectron time-of-flight mass spectrometer (ReTOF-MS), the reaction between the 1′- and 2′-methylnaphthyl radicals (C 11 H 9 ⋅) with the propargyl radical (C 3 H 3 ⋅) accesses anthracene (C 14 H 10 ) and phenanthrene (C 14 H 10 ) via the Propargyl Addition–BenzAnnulation (PABA) mechanism in conjunction with a hydrogen assisted isomerization. The preferential formation of the thermodynamically less stable anthracene isomer compared to phenanthrene suggests a kinetic, rather than a thermodynamics control of the reaction. Graphical The reaction between the 1’- and 2’-methylnaphthyl radicals (C 11 H 9 ⋅) with the propargyl radical (C 3 H 3 ⋅) accesses anthracene (C 14 H 10 ) and phenanthrene (C 14 H 10 ) via the Propargyl Addition–BenzAnnulation (PABA) mechanism in conjunction with a hydrogen assisted isomerization.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 10
·5834-5843
·
IF 3.049
Long Mao,Jing-yi Liu,Si-jie Zheng,Hui-qing Wu,Yue-jun Liu,Zhi-han Li,Yong-kang Bai
In this paper, a facile, green and mussel-inspired method is presented to prepare silver loaded layered double hydroxides (Ag-LDHs@PDA and Ag-LDHs@TA–Fe(III)) using a pre-synthesis polydopamine (PDA)/tannic acid (TA)–Fe(III) layer as a nanoscale guide and PDA/TA itself as a reducing reagent to form uniform silver nanoparticles (AgNPs) on the surface of modified LDHs. Meanwhile, another kind of LDH, Ag-LDHs(PVP), was prepared via the direct reduction of the precursor [Ag(NH3)2]+ with polyvinyl pyrrolidone (PVP). And three kinds of Ag-LDHs/poly(ε-caprolactone) (PCL) nanocomposite were prepared by blending Ag-LDHs and pure PCL via a solution casting method to obtain homogeneous films. It is shown that the obtained AgNPs are distributed on the LDH surfaces uniformly. And the high loading and medium size of the AgNPs present in Ag-LDHs(PVP) give it the best antibacterial properties. However, compared with Ag-LDHs(PVP), the better dispersibilities of Ag-LDHs@PDA and Ag-LDHs@TA–Fe(III) contribute to the greater aspect ratios of Ag-LDHs in the matrices, resulting in an increase in the number of tortuous paths for gas diffusion. Meanwhile, Ag-LDHs@PDA and Ag-LDHs@TA–Fe(III) have stronger interactions with the PCL matrix, which is favorable for the existence of less interface defects in the matrix, resulting in an improvement in the mechanical and gas barrier properties. Therefore, mussel-inspired antibacterial Ag-LDHs/PCL nanocomposites show preferable mechanical and gas barrier properties.
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高影响因子
Energy & Environmental Materials
·
2020
·Vol. 4
·期 1
·126-133
·
IF 0
Xiantao Meng,Xiang Deng,Liusheng Zhou,Bin Hu,Wenyi Tan,Wei Zhou,Meilin Liu,Zongping Shao
One of the critical challenges that limit broad commercialization of proton exchange membrane fuel cells (PEMFC) is to reduce the usage of Pt while maintaining high power output and sufficient durability. Herein, a novel bi-functional layer consisting of vertically aligned carbon nanotubes (VACNTs) and nanoparticles of Pt-Co catalysts (Pt-Co/VACNTs) is reported for high-performance PEMFCs. Readily prepared by a two-step process, the Pt-Co/VACNTs layer with a hydrophilic catalyst-loaded side and a hydrophobic gas diffusion side enables a PTFE-free electrode structure with fully exposed catalyst active sites and superior gas–water diffusion capability. When tested in a PEMFC, the bi-functional Pt-Co/VACNTs layer with ultralow Pt loading (~65 μg cathode cm −2 ) demonstrates a power density of 19.5 kW g Pt cathode −1 at 0.6 V, more than seven times that of a cell with commercial Pt/C catalyst (2.7 kW g Pt cathode −1 at 0.6 V) at a loading of 400 μg cathode cm −2 tested under similar conditions. This remarkable design of VACNTs-based catalyst with dual functionalities enables much lower Pt loading, faster mass transport, and higher electrochemical performance and stability. Further, the preparation procedure can be easily scaled up for low-cost fabrication and commercialization.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Haobo Bi,Zhanshi Ni,Junjian Tian,Chunlong Jiang,Hao Sun,Qizhao Lin
The effects of lignin (LIG) on coal gangue (CG) pyrolysis characteristics, gas emissions, and multi-lump parallel reaction modeling are studied in this paper. The combined thermogravimetry and Fourier infrared spectrometer were used to obtain the weight loss and gas product functional group data of the co-pyrolysis of coal gangue and lignin. Gaussian peaks were used to analyze the reaction degree of different proportions of lignin added to coal gangue at different temperatures. Moreover, principal component analysis (PCA) is applied to further analyze pyrolysis reaction process. During the pyrolysis of C1L3 samples, a synergistic interaction was discovered. The optimal mixing ratio of coal gangue and lignin during pyrolysis was obtained. The influence mechanism of lignin on coal gangue pyrolysis is studied in this article, which can provide technical support for the reduction and resource utilization of coal gangue. There are six-lump parallel reactions in pyrolysis after CG and LIG are mixed. The addition of LIG changed the CO 2 release law of CG pyrolysis. The strengthening of coal gangue disposal research is of positive significance for improving the environment and increasing the utilization rate of coal.
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