TALANTA
·
2012
·
IF 3.794
Lin Fan,Xiu-Ping Yan
Isostructural metal–organic frameworks (MOFs) MIL-100(Fe) and MIL-100(Cr), which have identical organic linker and Mobil Thirty-Nine zeolitic type, but different metal ions , were exploited as stationary phases for capillary gas chromatographic separation of alkane isomers. MIL-100(Fe) coated capillary column showed great capability and high efficiency for the gas chromatographic separation of alkane isomers without the need of temperature-programming, while MIL-100(Cr) coated capillary column gave poor performance for the separation. The separation performance of MIL-100(Fe) coated capillary column was even better than commercial HP-5MS and GS-GasPro capillary columns. The determined McReynolds constants, adsorption enthalpies and entropies showed that MIL-100(Fe) coated capillary column gave relatively weaker interaction with alkane isomers than MIL-100(Cr) coated capillary column. The relative standard deviations of repeatability for C7 alkane isomers on MIL-100(Fe) coated capillary column were 0.06–0.16%, 1.1–1.5%, 2.8–3.0% and 2.1–2.4% for retention time, half peak width, peak height and peak area, respectively.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Hairui Fang,Hong Chen,Rong Tan,Lei Ge,Tingting Zhao,Haochen Wang,Shenglin Yuan,Dong Wang
Sulfur dioxide (SO 2 ) is a toxic and harmful decomposition product generated during arc discharge or partial discharge in sulfur hexafluoride (SF 6 ) electrical equipment, which can corrode internal pipelines. Detecting SO 2 is crucial for assessing the insulation condition of equipment and preventing faults. To overcome the challenges faced by traditional SO 2 gas sensors, including high operating temperatures, slow response times, and poor moisture resistance, this paper proposes a novel SO 2 gas sensor based on CuO/MoO 3 . The morphology, composition, and chemical states of the materials were analyzed using different characterization techniques. At 90°C, the S2 sensor (CuO: MoO 3 =1: 1) exhibited a fast response time (10 s) to 10 ppm SO 2 and demonstrated good moisture resistance (a 1 % change in relative humidity (RH) has the same effect on the sensor as 25.9 ppb SO 2 ). The response of the S2 sensor to 100 ppm SO 2 was 26.5. Additionally, the voltage sensitivity of the S2 sensor at low (1–10 ppm) and high (10–100 ppm) concentrations are 658.74 mV/ppm and 33.43 mV/ppm, respectively. Therefore, the S2 sensor is more suitable for low concentration conditions. These good sensing characteristics of the S2 sensor are owing to the high content of oxygen vacancies (39.2 %) and the heterojunction effect in the composite material. Additionally, this sensor exhibits excellent anti-interference capabilities, including moisture resistance and high selectivity. Therefore, the CuO/MoO 3 -based SO 2 gas sensor can be effectively applied to detect the decomposition of SF 6 .
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yan Gao,Kangjia Sheng,Jiao Long,Junjie Yao,Tao Bao,Sicen Wang
Sample pretreatment prior to analysis is crucial for enhancing the quality of detection of target analytes. Herein, we propose a novel, easy-to-assemble continuous gas lift extraction device for the extraction of pharmaceutical pollutants. As a proof-of-concept, we assess the performance of the developed system through laboratory-scale experiments utilizing a homemade adsorbent. This device works by inserting an upright hollow cylindrical tube into the sample solution, with the upper end fitted with an air inlet and the lower end is equipped with a porous adsorbent. When gas is injected into the tube, the sample solution is circulated through the porous adsorbent driven by the pressure differential created by gas movement, thereby facilitating capture of target components within the sample solution. The adsorbent can be replaced based on the target molecule. We synthesize a type of porous adsorbent in the shape of a round cake, made from quartz sand that is surface-modified with a Zr-based metal–organic framework, using a solvothermal method. The experimental results indicate that the developed extraction method exhibits good performance with the limit of detections of 0.045–0.25 ng/mL, thereby demonstrating its potential for real-world applications.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 17
·12225-12234
·
IF 3.9
Zhixuan Wu,Zhengai Chen,Zhixiang Deng,Ning Dai,Yan Sun,Meiying Ge
In this work, a high-performance room-temperature ammonia (NH3) gas sensor based on Pt-modified WO3–TiO2 nanocrystals was synthesized via a two-step hydrothermal method. The structural properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The 10 at% Pt@WO3–TiO2 nanocrystals present the highest NH3 sensing performance at room temperature. Compared with the nanocrystals without Pt modification, the sensitivity of the Pt@WO3–TiO2 sensor is tenfold higher, with the lowest concentration threshold reaching the 75 ppb level. The response is approximately 92.28 to 50 ppm, and response and recovery times are 23 s and 8 s, respectively. The improved sensing was attributed to a synergetic mechanism involving the space charge layer effect and Pt metal sensitization, enhancing the electron transfer efficiency, oxygen vacancy and specific surface area. This study is expected to guide the development of high-performance room-temperature ammonia sensors for clinical breath testing.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shuaimei Li,Wenlei Zhang,Congwei Wang,Gang Li
Ethylene glycol (EG) is extensively utilized as anti-freezer and deicer, which would bring potential health risk under unintentional exposures especially with hazardous inhalation of EG aerosols or vapors. In this study, ZnIn 2 S 4 (ZIS)/WO 3 core-shell nanofibrous heterostructure loaded with optimized Au nanoparticles (NPs) was prepared for superiorly sensitive and selective EG gas sensing. The ternary Au/ZIS/WO 3 heterostructures exhibited an excellent response ( Ra/Rg =98.92) to 50 ppm EG, demonstrating an enhancement of 3.5 times compared to the binary ZIS/WO 3 , and a substantial improvement of 59.5 and 24.1 times compared to pure WO 3 and ZIS, respectively. The ternary Au/ZIS/WO 3 heterostructures also possessed an extremely low detection limit of 6 ppb, as well as excellent selectivity , repeatability, and long-term stability. This exceptional gas sensing performance can be attributed to its distinctive ternary Au/ZIS/WO 3 heterostructures with high specific surface areas . This unique structure not only facilitate the activation of abundant active oxygen species, but also promote the spillover effect of Au and enhance effective electronic distribution, thereby providing more EG adsorption sites, which was confirmed by density functional theory calculation. The synergistic effect arising from the metal-semiconductor interface and the core-shell heterostructure presents a novel avenue for advancing high-performance sensor technologies.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2017
·Vol. 17
·期 7
·1507
·
IF 2.677
Yuan Zhao,Qingrui Yang,Ye Chang,Wei Pang,Hao Zhang,Xuexin Duan
This paper demonstrates a novel micro-size (120 μm × 200 μm) piezoelectric gas sensor based on a piezotransduced single-crystal silicon bulk acoustic resonator (PSBAR). The PSBARs operate at 102 MHz and possess highQvalues (about 2000), ensuring the stability of the measurement. A corresponding gas sensor array is fabricated by integrating three different self-assembled monolayers (SAMs) modified PSBARs. The limit of detection (LOD) for ethanol vapor is demonstrated to be as low as 25 ppm with a sensitivity of about 1.5 Hz/ppm. Two sets of identification code bars based on the sensitivities and the adsorption energy constants are utilized to successfully discriminate isopropanol (IPA), ethanol, hexane and heptane vapors at low and high gas partial pressures, respectively. The proposed sensor array shows the potential to form a portable electronic nose system for volatile organic compound (VOC) differentiation.Keywords:e-nose system;piezotransduced single-crystal silicon bulk acoustic resonators;gas sensing;MEMS
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Xiaoyan Luo,Kaihong Chen,Haoran Li,Congmin Wang
A strategy for the capture and simultaneous fixation of CO 2 in the simulation of fuel gas by bifunctionalized ionic liquids (ILs) is reported. High conversion and good selectivity to cyclic carbonate were achieved directly from CO 2 of low concentration (10%) and at high temperature (100 °C) by making use of ILs with multiple roles as efficient absorbents for CO 2 capture and good catalysts for CO 2 utilization. A small amount of water benefits the fixation of CO 2 , making this reaction more applicable to condition of fuel gas. This method using bifunctionalized ionic liquid eliminates the energy penalty in CO 2 cooling and desorption step and opens a door to develop energy-saving and cost-effective CO 2 utilization, and thus holds promising potential in practical carbon capture and utilization.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 22
·11131-11142
·
IF 8.867
King Cheong Lam,Bolong Huang,San-Qiang Shi
We report on the relationship between the degree of reduction of graphene oxide (GO) and its room-temperature methane gas-sensing response by comparing four in situ reducing agents of GO: D-glucose, sodium borohydride, L-ascorbic acid and hydrazine hydrate. We found that gas sensing based on D-glucose and L-ascorbic acid had a higher gas response than that based on sodium borohydride and hydrazine hydrate because the residues contained oxygen functional groups. The poorly conductive GO was successfully reduced in situ by L-ascorbic acid to achieve high electrical conductivity and a high methane gas response. The incorporation of tin dioxide (SnO2) into the reduced GO (RGO) further increased the gas response by the p–n junction effect. The heterostructure of L-ascorbic acid-reduced RGO–SnO2 had the highest increase in methane response due to the synergistic effect between dehydroascorbic acid and the SnO2 surface. This was inferred from density functional theory calculations with self-consistently determined Hubbard U potentials (DFT+U). Compared with the current room-temperature methane sensing and fabrication technologies, the sensing technology reported here is cheaper to produce and more environmentally friendly while retaining the best sensitivity and wider sensing range.
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2017
·Vol. 10
·期 10
·3338-3349
·
IF 2.038
Tang Zhong-Sheng,Zeng Xin-An,Brennan Charles S.,Xie Wei-Qi
Fusel oils (FOs) are higher alcohols (including propanol, isobutanol, isoamylol, and active amyl alcohol), which affect the aroma profiles and flavor profiles of wine. A novel method for determination of FOs in lychee wine was developed using headspace gas chromatography (HS-GC). Results showed that 12% standard curve (SC) can be used to determinate the FOs of low alcoholic beverages, yet 40% SC can be used for high alcoholic beverages (e.g., brandy). Optimization of the parameters of equilibrium temperature at 50 °C was maintained for 30 min. The stabilized gas-liquid phase ratio of 3:1 for further research had no significant differences with others, which is caused by the distribution coefficient of K ≫ 100. The addition of sodium chloride (NaCl) decreased the partition coefficient of FOs markedly, and an inverse situation was observed for the extraction of FOs saturating at 1.25 g NaCl in 5 mL LW. Relative standard deviations (RSD) of reproducibility tests were in the range of 1.03–4.91%. Meanwhile, the mean recoveries of low, middle, and high concentration levels were 100.94, 103.2, and 96.74%, respectively. HS-GC was a stabilized, concise, and efficient method compared with the International Organization of Vine and Wine (OIV) method of OIV-MA-BS-14. These findings provide a foundation to determine higher alcohols of alcoholic beverages.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yang Li,Mingfei Jiao,Mujie Yang
ZnO nanoparticles or nanosheets have been in-situ grown on the substrate via a facile green approach featured with the hydrothermal treatment of electrospun nanofibers comprising polyvinyl alcohol and zinc acetate. The nanohybrids of ZnO with polypyrrole (PPy) were fabricated by the vapor phase polymerization of pyrrole on the surface of as-prepared nanostructured ZnO. The resulting nanohybrids were characterized by Fourier transform infrared spectroscopy, X-ray diffraction pattern, field emission scanning electron microscopy and high-resolution transmission electron microscopy and Brunauer–Emmett–Teller surface area measurements. Moreover, the electrical responses of the nanohybrids to NH 3 have been examined at room temperature. It was found that the nanohybrids revealed much higher response magnitude than either of the constituent component. Additionally, the morphology of ZnO affected the response magnitude of PPy/ZnO nanohybrids. The hybrids of ZnO nanosheets with PPy showed wide sensing range (0.5–200 ppm), very high response magnitude (relative resistance change of ∼20% towards 0.5 ppm of NH 3 ), good repeatability and selectivity. Attempts have been made to explore the gas sensing mechanism of the PPy/ZnO nanohybrids.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 61
·38444-38451
·
IF 3.108
Jia Xia,Kaidi Diao,Zhou Zheng,Xudong Cui
The design of porous metal oxides with noble metal doping has attracted tremendous attention due to their vital importance for gas sensing applications. Herein, we report the synthesis of porous Au/ZnO nanoparticles (NPs) through a facile metal organic framework (MOF) route. The structures, sensing properties, as well as sensing mechanisms of products are carefully investigated. The porous Au/ZnO NPs show a high gas-sensing response (17.1 ppm−1) and selectivity towards low concentration acetone at an optimum temperature of 275 °C. The enhanced sensing performances are ascribed to the chemical and electronic sensitization of Au NPs, the porous structure and the high specific surface area of Au/ZnO NPs. Our studies might provide a simple MOF-derived method to synthesize porous structures with noble metal doping and would be beneficial to the development of high performance gas sensing materials.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 53
·33510-33520
·
IF 3.108
Jinwei Wei,Bo Liang,Qingpeng Cao,Chentian Mo,Youming Zheng,Xuesong Ye
In this paper, vertically aligned PANI nanorod arrays were successfully prepared on GO nanosheets at low temperature via a dilute polymerization method, in which the GO nanosheets with abundant hydrophilic groups were employed to support the heterogeneous growth of uniformly-distributed PANI nanorod arrays. The acquired nanocomposite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). NH3 sensing performances of the as-prepared nanocomposite were carefully examined. With the help of the enhanced synergistic effect derived from the large number of p–n heterojunctions in the deliberately-designed microstructure, the device exhibited an enhanced response to NH3 vapor (14.63 at 50 ppm), wide dynamic range (1–6400 ppm), and fast response and recovery processes, in comparison to pure PANI nanofibers. The impact of the drop-coating amount of the sensing nanocomposite on the sensing performances was also investigated to find out the suitable amount for fabricating a high-performance ammonia sensor. Herein, the superior performances of the proposed well-organized microstructure make it an effective nanocomposite for gas sensing applications.
✓ 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）